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126 | .IX Title "LIBEV 3" |
135 | .IX Title "LIBEV 3" |
127 | .TH LIBEV 3 "2013-06-07" "libev-4.15" "libev - high performance full featured event loop" |
136 | .TH LIBEV 3 "2017-11-14" "libev-4.24" "libev - high performance full featured event loop" |
128 | .\" For nroff, turn off justification. Always turn off hyphenation; it makes |
137 | .\" For nroff, turn off justification. Always turn off hyphenation; it makes |
129 | .\" way too many mistakes in technical documents. |
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130 | .if n .ad l |
139 | .if n .ad l |
131 | .nh |
140 | .nh |
132 | .SH "NAME" |
141 | .SH "NAME" |
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134 | .SH "SYNOPSIS" |
143 | .SH "SYNOPSIS" |
135 | .IX Header "SYNOPSIS" |
144 | .IX Header "SYNOPSIS" |
136 | .Vb 1 |
145 | .Vb 1 |
137 | \& #include <ev.h> |
146 | \& #include <ev.h> |
138 | .Ve |
147 | .Ve |
139 | .SS "\s-1EXAMPLE\s0 \s-1PROGRAM\s0" |
148 | .SS "\s-1EXAMPLE PROGRAM\s0" |
140 | .IX Subsection "EXAMPLE PROGRAM" |
149 | .IX Subsection "EXAMPLE PROGRAM" |
141 | .Vb 2 |
150 | .Vb 2 |
142 | \& // a single header file is required |
151 | \& // a single header file is required |
143 | \& #include <ev.h> |
152 | \& #include <ev.h> |
144 | \& |
153 | \& |
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212 | throughout this document. |
221 | throughout this document. |
213 | .SH "WHAT TO READ WHEN IN A HURRY" |
222 | .SH "WHAT TO READ WHEN IN A HURRY" |
214 | .IX Header "WHAT TO READ WHEN IN A HURRY" |
223 | .IX Header "WHAT TO READ WHEN IN A HURRY" |
215 | This manual tries to be very detailed, but unfortunately, this also makes |
224 | This manual tries to be very detailed, but unfortunately, this also makes |
216 | it very long. If you just want to know the basics of libev, I suggest |
225 | it very long. If you just want to know the basics of libev, I suggest |
217 | reading \*(L"\s-1ANATOMY\s0 \s-1OF\s0 A \s-1WATCHER\s0\*(R", then the \*(L"\s-1EXAMPLE\s0 \s-1PROGRAM\s0\*(R" above and |
226 | reading \*(L"\s-1ANATOMY OF A WATCHER\*(R"\s0, then the \*(L"\s-1EXAMPLE PROGRAM\*(R"\s0 above and |
218 | look up the missing functions in \*(L"\s-1GLOBAL\s0 \s-1FUNCTIONS\s0\*(R" and the \f(CW\*(C`ev_io\*(C'\fR and |
227 | look up the missing functions in \*(L"\s-1GLOBAL FUNCTIONS\*(R"\s0 and the \f(CW\*(C`ev_io\*(C'\fR and |
219 | \&\f(CW\*(C`ev_timer\*(C'\fR sections in \*(L"\s-1WATCHER\s0 \s-1TYPES\s0\*(R". |
228 | \&\f(CW\*(C`ev_timer\*(C'\fR sections in \*(L"\s-1WATCHER TYPES\*(R"\s0. |
220 | .SH "ABOUT LIBEV" |
229 | .SH "ABOUT LIBEV" |
221 | .IX Header "ABOUT LIBEV" |
230 | .IX Header "ABOUT LIBEV" |
222 | Libev is an event loop: you register interest in certain events (such as a |
231 | Libev is an event loop: you register interest in certain events (such as a |
223 | file descriptor being readable or a timeout occurring), and it will manage |
232 | file descriptor being readable or a timeout occurring), and it will manage |
224 | these event sources and provide your program with events. |
233 | these event sources and provide your program with events. |
… | |
… | |
255 | more info about various configuration options please have a look at |
264 | more info about various configuration options please have a look at |
256 | \&\fB\s-1EMBED\s0\fR section in this manual. If libev was configured without support |
265 | \&\fB\s-1EMBED\s0\fR section in this manual. If libev was configured without support |
257 | for multiple event loops, then all functions taking an initial argument of |
266 | for multiple event loops, then all functions taking an initial argument of |
258 | name \f(CW\*(C`loop\*(C'\fR (which is always of type \f(CW\*(C`struct ev_loop *\*(C'\fR) will not have |
267 | name \f(CW\*(C`loop\*(C'\fR (which is always of type \f(CW\*(C`struct ev_loop *\*(C'\fR) will not have |
259 | this argument. |
268 | this argument. |
260 | .SS "\s-1TIME\s0 \s-1REPRESENTATION\s0" |
269 | .SS "\s-1TIME REPRESENTATION\s0" |
261 | .IX Subsection "TIME REPRESENTATION" |
270 | .IX Subsection "TIME REPRESENTATION" |
262 | Libev represents time as a single floating point number, representing |
271 | Libev represents time as a single floating point number, representing |
263 | the (fractional) number of seconds since the (\s-1POSIX\s0) epoch (in practice |
272 | the (fractional) number of seconds since the (\s-1POSIX\s0) epoch (in practice |
264 | somewhere near the beginning of 1970, details are complicated, don't |
273 | somewhere near the beginning of 1970, details are complicated, don't |
265 | ask). This type is called \f(CW\*(C`ev_tstamp\*(C'\fR, which is what you should use |
274 | ask). This type is called \f(CW\*(C`ev_tstamp\*(C'\fR, which is what you should use |
… | |
… | |
527 | make libev check for a fork in each iteration by enabling this flag. |
536 | make libev check for a fork in each iteration by enabling this flag. |
528 | .Sp |
537 | .Sp |
529 | This works by calling \f(CW\*(C`getpid ()\*(C'\fR on every iteration of the loop, |
538 | This works by calling \f(CW\*(C`getpid ()\*(C'\fR on every iteration of the loop, |
530 | and thus this might slow down your event loop if you do a lot of loop |
539 | and thus this might slow down your event loop if you do a lot of loop |
531 | iterations and little real work, but is usually not noticeable (on my |
540 | iterations and little real work, but is usually not noticeable (on my |
532 | GNU/Linux system for example, \f(CW\*(C`getpid\*(C'\fR is actually a simple 5\-insn sequence |
541 | GNU/Linux system for example, \f(CW\*(C`getpid\*(C'\fR is actually a simple 5\-insn |
533 | without a system call and thus \fIvery\fR fast, but my GNU/Linux system also has |
542 | sequence without a system call and thus \fIvery\fR fast, but my GNU/Linux |
534 | \&\f(CW\*(C`pthread_atfork\*(C'\fR which is even faster). |
543 | system also has \f(CW\*(C`pthread_atfork\*(C'\fR which is even faster). (Update: glibc |
|
|
544 | versions 2.25 apparently removed the \f(CW\*(C`getpid\*(C'\fR optimisation again). |
535 | .Sp |
545 | .Sp |
536 | The big advantage of this flag is that you can forget about fork (and |
546 | The big advantage of this flag is that you can forget about fork (and |
537 | forget about forgetting to tell libev about forking) when you use this |
547 | forget about forgetting to tell libev about forking, although you still |
538 | flag. |
548 | have to ignore \f(CW\*(C`SIGPIPE\*(C'\fR) when you use this flag. |
539 | .Sp |
549 | .Sp |
540 | This flag setting cannot be overridden or specified in the \f(CW\*(C`LIBEV_FLAGS\*(C'\fR |
550 | This flag setting cannot be overridden or specified in the \f(CW\*(C`LIBEV_FLAGS\*(C'\fR |
541 | environment variable. |
551 | environment variable. |
542 | .ie n .IP """EVFLAG_NOINOTIFY""" 4 |
552 | .ie n .IP """EVFLAG_NOINOTIFY""" 4 |
543 | .el .IP "\f(CWEVFLAG_NOINOTIFY\fR" 4 |
553 | .el .IP "\f(CWEVFLAG_NOINOTIFY\fR" 4 |
… | |
… | |
574 | \&\f(CW\*(C`sigprocmask\*(C'\fR, whose behaviour is officially unspecified. |
584 | \&\f(CW\*(C`sigprocmask\*(C'\fR, whose behaviour is officially unspecified. |
575 | .Sp |
585 | .Sp |
576 | This flag's behaviour will become the default in future versions of libev. |
586 | This flag's behaviour will become the default in future versions of libev. |
577 | .ie n .IP """EVBACKEND_SELECT"" (value 1, portable select backend)" 4 |
587 | .ie n .IP """EVBACKEND_SELECT"" (value 1, portable select backend)" 4 |
578 | .el .IP "\f(CWEVBACKEND_SELECT\fR (value 1, portable select backend)" 4 |
588 | .el .IP "\f(CWEVBACKEND_SELECT\fR (value 1, portable select backend)" 4 |
579 | .IX Item "EVBACKEND_SELECT (value 1, portable select backend)" |
589 | .IX Item "EVBACKEND_SELECT (value 1, portable select backend)" |
580 | This is your standard \fIselect\fR\|(2) backend. Not \fIcompletely\fR standard, as |
590 | This is your standard \fIselect\fR\|(2) backend. Not \fIcompletely\fR standard, as |
581 | libev tries to roll its own fd_set with no limits on the number of fds, |
591 | libev tries to roll its own fd_set with no limits on the number of fds, |
582 | but if that fails, expect a fairly low limit on the number of fds when |
592 | but if that fails, expect a fairly low limit on the number of fds when |
583 | using this backend. It doesn't scale too well (O(highest_fd)), but its |
593 | using this backend. It doesn't scale too well (O(highest_fd)), but its |
584 | usually the fastest backend for a low number of (low-numbered :) fds. |
594 | usually the fastest backend for a low number of (low-numbered :) fds. |
… | |
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593 | This backend maps \f(CW\*(C`EV_READ\*(C'\fR to the \f(CW\*(C`readfds\*(C'\fR set and \f(CW\*(C`EV_WRITE\*(C'\fR to the |
603 | This backend maps \f(CW\*(C`EV_READ\*(C'\fR to the \f(CW\*(C`readfds\*(C'\fR set and \f(CW\*(C`EV_WRITE\*(C'\fR to the |
594 | \&\f(CW\*(C`writefds\*(C'\fR set (and to work around Microsoft Windows bugs, also onto the |
604 | \&\f(CW\*(C`writefds\*(C'\fR set (and to work around Microsoft Windows bugs, also onto the |
595 | \&\f(CW\*(C`exceptfds\*(C'\fR set on that platform). |
605 | \&\f(CW\*(C`exceptfds\*(C'\fR set on that platform). |
596 | .ie n .IP """EVBACKEND_POLL"" (value 2, poll backend, available everywhere except on windows)" 4 |
606 | .ie n .IP """EVBACKEND_POLL"" (value 2, poll backend, available everywhere except on windows)" 4 |
597 | .el .IP "\f(CWEVBACKEND_POLL\fR (value 2, poll backend, available everywhere except on windows)" 4 |
607 | .el .IP "\f(CWEVBACKEND_POLL\fR (value 2, poll backend, available everywhere except on windows)" 4 |
598 | .IX Item "EVBACKEND_POLL (value 2, poll backend, available everywhere except on windows)" |
608 | .IX Item "EVBACKEND_POLL (value 2, poll backend, available everywhere except on windows)" |
599 | And this is your standard \fIpoll\fR\|(2) backend. It's more complicated |
609 | And this is your standard \fIpoll\fR\|(2) backend. It's more complicated |
600 | than select, but handles sparse fds better and has no artificial |
610 | than select, but handles sparse fds better and has no artificial |
601 | limit on the number of fds you can use (except it will slow down |
611 | limit on the number of fds you can use (except it will slow down |
602 | considerably with a lot of inactive fds). It scales similarly to select, |
612 | considerably with a lot of inactive fds). It scales similarly to select, |
603 | i.e. O(total_fds). See the entry for \f(CW\*(C`EVBACKEND_SELECT\*(C'\fR, above, for |
613 | i.e. O(total_fds). See the entry for \f(CW\*(C`EVBACKEND_SELECT\*(C'\fR, above, for |
… | |
… | |
605 | .Sp |
615 | .Sp |
606 | This backend maps \f(CW\*(C`EV_READ\*(C'\fR to \f(CW\*(C`POLLIN | POLLERR | POLLHUP\*(C'\fR, and |
616 | This backend maps \f(CW\*(C`EV_READ\*(C'\fR to \f(CW\*(C`POLLIN | POLLERR | POLLHUP\*(C'\fR, and |
607 | \&\f(CW\*(C`EV_WRITE\*(C'\fR to \f(CW\*(C`POLLOUT | POLLERR | POLLHUP\*(C'\fR. |
617 | \&\f(CW\*(C`EV_WRITE\*(C'\fR to \f(CW\*(C`POLLOUT | POLLERR | POLLHUP\*(C'\fR. |
608 | .ie n .IP """EVBACKEND_EPOLL"" (value 4, Linux)" 4 |
618 | .ie n .IP """EVBACKEND_EPOLL"" (value 4, Linux)" 4 |
609 | .el .IP "\f(CWEVBACKEND_EPOLL\fR (value 4, Linux)" 4 |
619 | .el .IP "\f(CWEVBACKEND_EPOLL\fR (value 4, Linux)" 4 |
610 | .IX Item "EVBACKEND_EPOLL (value 4, Linux)" |
620 | .IX Item "EVBACKEND_EPOLL (value 4, Linux)" |
611 | Use the linux-specific \fIepoll\fR\|(7) interface (for both pre\- and post\-2.6.9 |
621 | Use the linux-specific \fIepoll\fR\|(7) interface (for both pre\- and post\-2.6.9 |
612 | kernels). |
622 | kernels). |
613 | .Sp |
623 | .Sp |
614 | For few fds, this backend is a bit little slower than poll and select, but |
624 | For few fds, this backend is a bit little slower than poll and select, but |
615 | it scales phenomenally better. While poll and select usually scale like |
625 | it scales phenomenally better. While poll and select usually scale like |
… | |
… | |
668 | .Sp |
678 | .Sp |
669 | This backend maps \f(CW\*(C`EV_READ\*(C'\fR and \f(CW\*(C`EV_WRITE\*(C'\fR in the same way as |
679 | This backend maps \f(CW\*(C`EV_READ\*(C'\fR and \f(CW\*(C`EV_WRITE\*(C'\fR in the same way as |
670 | \&\f(CW\*(C`EVBACKEND_POLL\*(C'\fR. |
680 | \&\f(CW\*(C`EVBACKEND_POLL\*(C'\fR. |
671 | .ie n .IP """EVBACKEND_KQUEUE"" (value 8, most \s-1BSD\s0 clones)" 4 |
681 | .ie n .IP """EVBACKEND_KQUEUE"" (value 8, most \s-1BSD\s0 clones)" 4 |
672 | .el .IP "\f(CWEVBACKEND_KQUEUE\fR (value 8, most \s-1BSD\s0 clones)" 4 |
682 | .el .IP "\f(CWEVBACKEND_KQUEUE\fR (value 8, most \s-1BSD\s0 clones)" 4 |
673 | .IX Item "EVBACKEND_KQUEUE (value 8, most BSD clones)" |
683 | .IX Item "EVBACKEND_KQUEUE (value 8, most BSD clones)" |
674 | Kqueue deserves special mention, as at the time of this writing, it |
684 | Kqueue deserves special mention, as at the time of this writing, it |
675 | was broken on all BSDs except NetBSD (usually it doesn't work reliably |
685 | was broken on all BSDs except NetBSD (usually it doesn't work reliably |
676 | with anything but sockets and pipes, except on Darwin, where of course |
686 | with anything but sockets and pipes, except on Darwin, where of course |
677 | it's completely useless). Unlike epoll, however, whose brokenness |
687 | it's completely useless). Unlike epoll, however, whose brokenness |
678 | is by design, these kqueue bugs can (and eventually will) be fixed |
688 | is by design, these kqueue bugs can (and eventually will) be fixed |
… | |
… | |
698 | While nominally embeddable in other event loops, this doesn't work |
708 | While nominally embeddable in other event loops, this doesn't work |
699 | everywhere, so you might need to test for this. And since it is broken |
709 | everywhere, so you might need to test for this. And since it is broken |
700 | almost everywhere, you should only use it when you have a lot of sockets |
710 | almost everywhere, you should only use it when you have a lot of sockets |
701 | (for which it usually works), by embedding it into another event loop |
711 | (for which it usually works), by embedding it into another event loop |
702 | (e.g. \f(CW\*(C`EVBACKEND_SELECT\*(C'\fR or \f(CW\*(C`EVBACKEND_POLL\*(C'\fR (but \f(CW\*(C`poll\*(C'\fR is of course |
712 | (e.g. \f(CW\*(C`EVBACKEND_SELECT\*(C'\fR or \f(CW\*(C`EVBACKEND_POLL\*(C'\fR (but \f(CW\*(C`poll\*(C'\fR is of course |
703 | also broken on \s-1OS\s0 X)) and, did I mention it, using it only for sockets. |
713 | also broken on \s-1OS X\s0)) and, did I mention it, using it only for sockets. |
704 | .Sp |
714 | .Sp |
705 | This backend maps \f(CW\*(C`EV_READ\*(C'\fR into an \f(CW\*(C`EVFILT_READ\*(C'\fR kevent with |
715 | This backend maps \f(CW\*(C`EV_READ\*(C'\fR into an \f(CW\*(C`EVFILT_READ\*(C'\fR kevent with |
706 | \&\f(CW\*(C`NOTE_EOF\*(C'\fR, and \f(CW\*(C`EV_WRITE\*(C'\fR into an \f(CW\*(C`EVFILT_WRITE\*(C'\fR kevent with |
716 | \&\f(CW\*(C`NOTE_EOF\*(C'\fR, and \f(CW\*(C`EV_WRITE\*(C'\fR into an \f(CW\*(C`EVFILT_WRITE\*(C'\fR kevent with |
707 | \&\f(CW\*(C`NOTE_EOF\*(C'\fR. |
717 | \&\f(CW\*(C`NOTE_EOF\*(C'\fR. |
708 | .ie n .IP """EVBACKEND_DEVPOLL"" (value 16, Solaris 8)" 4 |
718 | .ie n .IP """EVBACKEND_DEVPOLL"" (value 16, Solaris 8)" 4 |
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712 | implementation). According to reports, \f(CW\*(C`/dev/poll\*(C'\fR only supports sockets |
722 | implementation). According to reports, \f(CW\*(C`/dev/poll\*(C'\fR only supports sockets |
713 | and is not embeddable, which would limit the usefulness of this backend |
723 | and is not embeddable, which would limit the usefulness of this backend |
714 | immensely. |
724 | immensely. |
715 | .ie n .IP """EVBACKEND_PORT"" (value 32, Solaris 10)" 4 |
725 | .ie n .IP """EVBACKEND_PORT"" (value 32, Solaris 10)" 4 |
716 | .el .IP "\f(CWEVBACKEND_PORT\fR (value 32, Solaris 10)" 4 |
726 | .el .IP "\f(CWEVBACKEND_PORT\fR (value 32, Solaris 10)" 4 |
717 | .IX Item "EVBACKEND_PORT (value 32, Solaris 10)" |
727 | .IX Item "EVBACKEND_PORT (value 32, Solaris 10)" |
718 | This uses the Solaris 10 event port mechanism. As with everything on Solaris, |
728 | This uses the Solaris 10 event port mechanism. As with everything on Solaris, |
719 | it's really slow, but it still scales very well (O(active_fds)). |
729 | it's really slow, but it still scales very well (O(active_fds)). |
720 | .Sp |
730 | .Sp |
721 | While this backend scales well, it requires one system call per active |
731 | While this backend scales well, it requires one system call per active |
722 | file descriptor per loop iteration. For small and medium numbers of file |
732 | file descriptor per loop iteration. For small and medium numbers of file |
… | |
… | |
801 | except in the rare occasion where you really need to free its resources. |
811 | except in the rare occasion where you really need to free its resources. |
802 | If you need dynamically allocated loops it is better to use \f(CW\*(C`ev_loop_new\*(C'\fR |
812 | If you need dynamically allocated loops it is better to use \f(CW\*(C`ev_loop_new\*(C'\fR |
803 | and \f(CW\*(C`ev_loop_destroy\*(C'\fR. |
813 | and \f(CW\*(C`ev_loop_destroy\*(C'\fR. |
804 | .IP "ev_loop_fork (loop)" 4 |
814 | .IP "ev_loop_fork (loop)" 4 |
805 | .IX Item "ev_loop_fork (loop)" |
815 | .IX Item "ev_loop_fork (loop)" |
806 | This function sets a flag that causes subsequent \f(CW\*(C`ev_run\*(C'\fR iterations to |
816 | This function sets a flag that causes subsequent \f(CW\*(C`ev_run\*(C'\fR iterations |
807 | reinitialise the kernel state for backends that have one. Despite the |
817 | to reinitialise the kernel state for backends that have one. Despite |
808 | name, you can call it anytime, but it makes most sense after forking, in |
818 | the name, you can call it anytime you are allowed to start or stop |
809 | the child process. You \fImust\fR call it (or use \f(CW\*(C`EVFLAG_FORKCHECK\*(C'\fR) in the |
819 | watchers (except inside an \f(CW\*(C`ev_prepare\*(C'\fR callback), but it makes most |
810 | child before resuming or calling \f(CW\*(C`ev_run\*(C'\fR. |
820 | sense after forking, in the child process. You \fImust\fR call it (or use |
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|
821 | \&\f(CW\*(C`EVFLAG_FORKCHECK\*(C'\fR) in the child before resuming or calling \f(CW\*(C`ev_run\*(C'\fR. |
811 | .Sp |
822 | .Sp |
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|
823 | In addition, if you want to reuse a loop (via this function or |
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824 | \&\f(CW\*(C`EVFLAG_FORKCHECK\*(C'\fR), you \fIalso\fR have to ignore \f(CW\*(C`SIGPIPE\*(C'\fR. |
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825 | .Sp |
812 | Again, you \fIhave\fR to call it on \fIany\fR loop that you want to re-use after |
826 | Again, you \fIhave\fR to call it on \fIany\fR loop that you want to re-use after |
813 | a fork, \fIeven if you do not plan to use the loop in the parent\fR. This is |
827 | a fork, \fIeven if you do not plan to use the loop in the parent\fR. This is |
814 | because some kernel interfaces *cough* \fIkqueue\fR *cough* do funny things |
828 | because some kernel interfaces *cough* \fIkqueue\fR *cough* do funny things |
815 | during fork. |
829 | during fork. |
816 | .Sp |
830 | .Sp |
817 | On the other hand, you only need to call this function in the child |
831 | On the other hand, you only need to call this function in the child |
… | |
… | |
1354 | example it might indicate that a fd is readable or writable, and if your |
1368 | example it might indicate that a fd is readable or writable, and if your |
1355 | callbacks is well-written it can just attempt the operation and cope with |
1369 | callbacks is well-written it can just attempt the operation and cope with |
1356 | the error from \fIread()\fR or \fIwrite()\fR. This will not work in multi-threaded |
1370 | the error from \fIread()\fR or \fIwrite()\fR. This will not work in multi-threaded |
1357 | programs, though, as the fd could already be closed and reused for another |
1371 | programs, though, as the fd could already be closed and reused for another |
1358 | thing, so beware. |
1372 | thing, so beware. |
1359 | .SS "\s-1GENERIC\s0 \s-1WATCHER\s0 \s-1FUNCTIONS\s0" |
1373 | .SS "\s-1GENERIC WATCHER FUNCTIONS\s0" |
1360 | .IX Subsection "GENERIC WATCHER FUNCTIONS" |
1374 | .IX Subsection "GENERIC WATCHER FUNCTIONS" |
1361 | .ie n .IP """ev_init"" (ev_TYPE *watcher, callback)" 4 |
1375 | .ie n .IP """ev_init"" (ev_TYPE *watcher, callback)" 4 |
1362 | .el .IP "\f(CWev_init\fR (ev_TYPE *watcher, callback)" 4 |
1376 | .el .IP "\f(CWev_init\fR (ev_TYPE *watcher, callback)" 4 |
1363 | .IX Item "ev_init (ev_TYPE *watcher, callback)" |
1377 | .IX Item "ev_init (ev_TYPE *watcher, callback)" |
1364 | This macro initialises the generic portion of a watcher. The contents |
1378 | This macro initialises the generic portion of a watcher. The contents |
… | |
… | |
1472 | or might not have been clamped to the valid range. |
1486 | or might not have been clamped to the valid range. |
1473 | .Sp |
1487 | .Sp |
1474 | The default priority used by watchers when no priority has been set is |
1488 | The default priority used by watchers when no priority has been set is |
1475 | always \f(CW0\fR, which is supposed to not be too high and not be too low :). |
1489 | always \f(CW0\fR, which is supposed to not be too high and not be too low :). |
1476 | .Sp |
1490 | .Sp |
1477 | See \*(L"\s-1WATCHER\s0 \s-1PRIORITY\s0 \s-1MODELS\s0\*(R", below, for a more thorough treatment of |
1491 | See \*(L"\s-1WATCHER PRIORITY MODELS\*(R"\s0, below, for a more thorough treatment of |
1478 | priorities. |
1492 | priorities. |
1479 | .IP "ev_invoke (loop, ev_TYPE *watcher, int revents)" 4 |
1493 | .IP "ev_invoke (loop, ev_TYPE *watcher, int revents)" 4 |
1480 | .IX Item "ev_invoke (loop, ev_TYPE *watcher, int revents)" |
1494 | .IX Item "ev_invoke (loop, ev_TYPE *watcher, int revents)" |
1481 | Invoke the \f(CW\*(C`watcher\*(C'\fR with the given \f(CW\*(C`loop\*(C'\fR and \f(CW\*(C`revents\*(C'\fR. Neither |
1495 | Invoke the \f(CW\*(C`watcher\*(C'\fR with the given \f(CW\*(C`loop\*(C'\fR and \f(CW\*(C`revents\*(C'\fR. Neither |
1482 | \&\f(CW\*(C`loop\*(C'\fR nor \f(CW\*(C`revents\*(C'\fR need to be valid as long as the watcher callback |
1496 | \&\f(CW\*(C`loop\*(C'\fR nor \f(CW\*(C`revents\*(C'\fR need to be valid as long as the watcher callback |
… | |
… | |
1502 | not started in the first place. |
1516 | not started in the first place. |
1503 | .Sp |
1517 | .Sp |
1504 | See also \f(CW\*(C`ev_feed_fd_event\*(C'\fR and \f(CW\*(C`ev_feed_signal_event\*(C'\fR for related |
1518 | See also \f(CW\*(C`ev_feed_fd_event\*(C'\fR and \f(CW\*(C`ev_feed_signal_event\*(C'\fR for related |
1505 | functions that do not need a watcher. |
1519 | functions that do not need a watcher. |
1506 | .PP |
1520 | .PP |
1507 | See also the \*(L"\s-1ASSOCIATING\s0 \s-1CUSTOM\s0 \s-1DATA\s0 \s-1WITH\s0 A \s-1WATCHER\s0\*(R" and \*(L"\s-1BUILDING\s0 \s-1YOUR\s0 |
1521 | See also the \*(L"\s-1ASSOCIATING CUSTOM DATA WITH A WATCHER\*(R"\s0 and \*(L"\s-1BUILDING YOUR |
1508 | \&\s-1OWN\s0 \s-1COMPOSITE\s0 \s-1WATCHERS\s0\*(R" idioms. |
1522 | OWN COMPOSITE WATCHERS\*(R"\s0 idioms. |
1509 | .SS "\s-1WATCHER\s0 \s-1STATES\s0" |
1523 | .SS "\s-1WATCHER STATES\s0" |
1510 | .IX Subsection "WATCHER STATES" |
1524 | .IX Subsection "WATCHER STATES" |
1511 | There are various watcher states mentioned throughout this manual \- |
1525 | There are various watcher states mentioned throughout this manual \- |
1512 | active, pending and so on. In this section these states and the rules to |
1526 | active, pending and so on. In this section these states and the rules to |
1513 | transition between them will be described in more detail \- and while these |
1527 | transition between them will be described in more detail \- and while these |
1514 | rules might look complicated, they usually do \*(L"the right thing\*(R". |
1528 | rules might look complicated, they usually do \*(L"the right thing\*(R". |
… | |
… | |
1557 | .Sp |
1571 | .Sp |
1558 | While stopped (and not pending) the watcher is essentially in the |
1572 | While stopped (and not pending) the watcher is essentially in the |
1559 | initialised state, that is, it can be reused, moved, modified in any way |
1573 | initialised state, that is, it can be reused, moved, modified in any way |
1560 | you wish (but when you trash the memory block, you need to \f(CW\*(C`ev_TYPE_init\*(C'\fR |
1574 | you wish (but when you trash the memory block, you need to \f(CW\*(C`ev_TYPE_init\*(C'\fR |
1561 | it again). |
1575 | it again). |
1562 | .SS "\s-1WATCHER\s0 \s-1PRIORITY\s0 \s-1MODELS\s0" |
1576 | .SS "\s-1WATCHER PRIORITY MODELS\s0" |
1563 | .IX Subsection "WATCHER PRIORITY MODELS" |
1577 | .IX Subsection "WATCHER PRIORITY MODELS" |
1564 | Many event loops support \fIwatcher priorities\fR, which are usually small |
1578 | Many event loops support \fIwatcher priorities\fR, which are usually small |
1565 | integers that influence the ordering of event callback invocation |
1579 | integers that influence the ordering of event callback invocation |
1566 | between watchers in some way, all else being equal. |
1580 | between watchers in some way, all else being equal. |
1567 | .PP |
1581 | .PP |
… | |
… | |
1765 | wish to read \- you would first have to request some data. |
1779 | wish to read \- you would first have to request some data. |
1766 | .PP |
1780 | .PP |
1767 | Since files are typically not-so-well supported by advanced notification |
1781 | Since files are typically not-so-well supported by advanced notification |
1768 | mechanism, libev tries hard to emulate \s-1POSIX\s0 behaviour with respect |
1782 | mechanism, libev tries hard to emulate \s-1POSIX\s0 behaviour with respect |
1769 | to files, even though you should not use it. The reason for this is |
1783 | to files, even though you should not use it. The reason for this is |
1770 | convenience: sometimes you want to watch \s-1STDIN\s0 or \s-1STDOUT\s0, which is |
1784 | convenience: sometimes you want to watch \s-1STDIN\s0 or \s-1STDOUT,\s0 which is |
1771 | usually a tty, often a pipe, but also sometimes files or special devices |
1785 | usually a tty, often a pipe, but also sometimes files or special devices |
1772 | (for example, \f(CW\*(C`epoll\*(C'\fR on Linux works with \fI/dev/random\fR but not with |
1786 | (for example, \f(CW\*(C`epoll\*(C'\fR on Linux works with \fI/dev/random\fR but not with |
1773 | \&\fI/dev/urandom\fR), and even though the file might better be served with |
1787 | \&\fI/dev/urandom\fR), and even though the file might better be served with |
1774 | asynchronous I/O instead of with non-blocking I/O, it is still useful when |
1788 | asynchronous I/O instead of with non-blocking I/O, it is still useful when |
1775 | it \*(L"just works\*(R" instead of freezing. |
1789 | it \*(L"just works\*(R" instead of freezing. |
1776 | .PP |
1790 | .PP |
1777 | So avoid file descriptors pointing to files when you know it (e.g. use |
1791 | So avoid file descriptors pointing to files when you know it (e.g. use |
1778 | libeio), but use them when it is convenient, e.g. for \s-1STDIN/STDOUT\s0, or |
1792 | libeio), but use them when it is convenient, e.g. for \s-1STDIN/STDOUT,\s0 or |
1779 | when you rarely read from a file instead of from a socket, and want to |
1793 | when you rarely read from a file instead of from a socket, and want to |
1780 | reuse the same code path. |
1794 | reuse the same code path. |
1781 | .PP |
1795 | .PP |
1782 | \fIThe special problem of fork\fR |
1796 | \fIThe special problem of fork\fR |
1783 | .IX Subsection "The special problem of fork" |
1797 | .IX Subsection "The special problem of fork" |
… | |
… | |
1793 | \fIThe special problem of \s-1SIGPIPE\s0\fR |
1807 | \fIThe special problem of \s-1SIGPIPE\s0\fR |
1794 | .IX Subsection "The special problem of SIGPIPE" |
1808 | .IX Subsection "The special problem of SIGPIPE" |
1795 | .PP |
1809 | .PP |
1796 | While not really specific to libev, it is easy to forget about \f(CW\*(C`SIGPIPE\*(C'\fR: |
1810 | While not really specific to libev, it is easy to forget about \f(CW\*(C`SIGPIPE\*(C'\fR: |
1797 | when writing to a pipe whose other end has been closed, your program gets |
1811 | when writing to a pipe whose other end has been closed, your program gets |
1798 | sent a \s-1SIGPIPE\s0, which, by default, aborts your program. For most programs |
1812 | sent a \s-1SIGPIPE,\s0 which, by default, aborts your program. For most programs |
1799 | this is sensible behaviour, for daemons, this is usually undesirable. |
1813 | this is sensible behaviour, for daemons, this is usually undesirable. |
1800 | .PP |
1814 | .PP |
1801 | So when you encounter spurious, unexplained daemon exits, make sure you |
1815 | So when you encounter spurious, unexplained daemon exits, make sure you |
1802 | ignore \s-1SIGPIPE\s0 (and maybe make sure you log the exit status of your daemon |
1816 | ignore \s-1SIGPIPE \s0(and maybe make sure you log the exit status of your daemon |
1803 | somewhere, as that would have given you a big clue). |
1817 | somewhere, as that would have given you a big clue). |
1804 | .PP |
1818 | .PP |
1805 | \fIThe special problem of \fIaccept()\fIing when you can't\fR |
1819 | \fIThe special problem of \fIaccept()\fIing when you can't\fR |
1806 | .IX Subsection "The special problem of accept()ing when you can't" |
1820 | .IX Subsection "The special problem of accept()ing when you can't" |
1807 | .PP |
1821 | .PP |
1808 | Many implementations of the \s-1POSIX\s0 \f(CW\*(C`accept\*(C'\fR function (for example, |
1822 | Many implementations of the \s-1POSIX \s0\f(CW\*(C`accept\*(C'\fR function (for example, |
1809 | found in post\-2004 Linux) have the peculiar behaviour of not removing a |
1823 | found in post\-2004 Linux) have the peculiar behaviour of not removing a |
1810 | connection from the pending queue in all error cases. |
1824 | connection from the pending queue in all error cases. |
1811 | .PP |
1825 | .PP |
1812 | For example, larger servers often run out of file descriptors (because |
1826 | For example, larger servers often run out of file descriptors (because |
1813 | of resource limits), causing \f(CW\*(C`accept\*(C'\fR to fail with \f(CW\*(C`ENFILE\*(C'\fR but not |
1827 | of resource limits), causing \f(CW\*(C`accept\*(C'\fR to fail with \f(CW\*(C`ENFILE\*(C'\fR but not |
… | |
… | |
2152 | .PP |
2166 | .PP |
2153 | The relative timeouts are calculated relative to the \f(CW\*(C`ev_now ()\*(C'\fR |
2167 | The relative timeouts are calculated relative to the \f(CW\*(C`ev_now ()\*(C'\fR |
2154 | time. This is usually the right thing as this timestamp refers to the time |
2168 | time. This is usually the right thing as this timestamp refers to the time |
2155 | of the event triggering whatever timeout you are modifying/starting. If |
2169 | of the event triggering whatever timeout you are modifying/starting. If |
2156 | you suspect event processing to be delayed and you \fIneed\fR to base the |
2170 | you suspect event processing to be delayed and you \fIneed\fR to base the |
2157 | timeout on the current time, use something like this to adjust for this: |
2171 | timeout on the current time, use something like the following to adjust |
|
|
2172 | for it: |
2158 | .PP |
2173 | .PP |
2159 | .Vb 1 |
2174 | .Vb 1 |
2160 | \& ev_timer_set (&timer, after + ev_now () \- ev_time (), 0.); |
2175 | \& ev_timer_set (&timer, after + (ev_time () \- ev_now ()), 0.); |
2161 | .Ve |
2176 | .Ve |
2162 | .PP |
2177 | .PP |
2163 | If the event loop is suspended for a long time, you can also force an |
2178 | If the event loop is suspended for a long time, you can also force an |
2164 | update of the time returned by \f(CW\*(C`ev_now ()\*(C'\fR by calling \f(CW\*(C`ev_now_update |
2179 | update of the time returned by \f(CW\*(C`ev_now ()\*(C'\fR by calling \f(CW\*(C`ev_now_update |
2165 | ()\*(C'\fR. |
2180 | ()\*(C'\fR, although that will push the event time of all outstanding events |
|
|
2181 | further into the future. |
2166 | .PP |
2182 | .PP |
2167 | \fIThe special problem of unsynchronised clocks\fR |
2183 | \fIThe special problem of unsynchronised clocks\fR |
2168 | .IX Subsection "The special problem of unsynchronised clocks" |
2184 | .IX Subsection "The special problem of unsynchronised clocks" |
2169 | .PP |
2185 | .PP |
2170 | Modern systems have a variety of clocks \- libev itself uses the normal |
2186 | Modern systems have a variety of clocks \- libev itself uses the normal |
… | |
… | |
2331 | Periodic watchers are also timers of a kind, but they are very versatile |
2347 | Periodic watchers are also timers of a kind, but they are very versatile |
2332 | (and unfortunately a bit complex). |
2348 | (and unfortunately a bit complex). |
2333 | .PP |
2349 | .PP |
2334 | Unlike \f(CW\*(C`ev_timer\*(C'\fR, periodic watchers are not based on real time (or |
2350 | Unlike \f(CW\*(C`ev_timer\*(C'\fR, periodic watchers are not based on real time (or |
2335 | relative time, the physical time that passes) but on wall clock time |
2351 | relative time, the physical time that passes) but on wall clock time |
2336 | (absolute time, the thing you can read on your calender or clock). The |
2352 | (absolute time, the thing you can read on your calendar or clock). The |
2337 | difference is that wall clock time can run faster or slower than real |
2353 | difference is that wall clock time can run faster or slower than real |
2338 | time, and time jumps are not uncommon (e.g. when you adjust your |
2354 | time, and time jumps are not uncommon (e.g. when you adjust your |
2339 | wrist-watch). |
2355 | wrist-watch). |
2340 | .PP |
2356 | .PP |
2341 | You can tell a periodic watcher to trigger after some specific point |
2357 | You can tell a periodic watcher to trigger after some specific point |
… | |
… | |
2418 | In this mode the values for \f(CW\*(C`interval\*(C'\fR and \f(CW\*(C`offset\*(C'\fR are both being |
2434 | In this mode the values for \f(CW\*(C`interval\*(C'\fR and \f(CW\*(C`offset\*(C'\fR are both being |
2419 | ignored. Instead, each time the periodic watcher gets scheduled, the |
2435 | ignored. Instead, each time the periodic watcher gets scheduled, the |
2420 | reschedule callback will be called with the watcher as first, and the |
2436 | reschedule callback will be called with the watcher as first, and the |
2421 | current time as second argument. |
2437 | current time as second argument. |
2422 | .Sp |
2438 | .Sp |
2423 | \&\s-1NOTE:\s0 \fIThis callback \s-1MUST\s0 \s-1NOT\s0 stop or destroy any periodic watcher, ever, |
2439 | \&\s-1NOTE: \s0\fIThis callback \s-1MUST NOT\s0 stop or destroy any periodic watcher, ever, |
2424 | or make \s-1ANY\s0 other event loop modifications whatsoever, unless explicitly |
2440 | or make \s-1ANY\s0 other event loop modifications whatsoever, unless explicitly |
2425 | allowed by documentation here\fR. |
2441 | allowed by documentation here\fR. |
2426 | .Sp |
2442 | .Sp |
2427 | If you need to stop it, return \f(CW\*(C`now + 1e30\*(C'\fR (or so, fudge fudge) and stop |
2443 | If you need to stop it, return \f(CW\*(C`now + 1e30\*(C'\fR (or so, fudge fudge) and stop |
2428 | it afterwards (e.g. by starting an \f(CW\*(C`ev_prepare\*(C'\fR watcher, which is the |
2444 | it afterwards (e.g. by starting an \f(CW\*(C`ev_prepare\*(C'\fR watcher, which is the |
… | |
… | |
2442 | It must return the next time to trigger, based on the passed time value |
2458 | It must return the next time to trigger, based on the passed time value |
2443 | (that is, the lowest time value larger than to the second argument). It |
2459 | (that is, the lowest time value larger than to the second argument). It |
2444 | will usually be called just before the callback will be triggered, but |
2460 | will usually be called just before the callback will be triggered, but |
2445 | might be called at other times, too. |
2461 | might be called at other times, too. |
2446 | .Sp |
2462 | .Sp |
2447 | \&\s-1NOTE:\s0 \fIThis callback must always return a time that is higher than or |
2463 | \&\s-1NOTE: \s0\fIThis callback must always return a time that is higher than or |
2448 | equal to the passed \f(CI\*(C`now\*(C'\fI value\fR. |
2464 | equal to the passed \f(CI\*(C`now\*(C'\fI value\fR. |
2449 | .Sp |
2465 | .Sp |
2450 | This can be used to create very complex timers, such as a timer that |
2466 | This can be used to create very complex timers, such as a timer that |
2451 | triggers on \*(L"next midnight, local time\*(R". To do this, you would calculate the |
2467 | triggers on \*(L"next midnight, local time\*(R". To do this, you would calculate the |
2452 | next midnight after \f(CW\*(C`now\*(C'\fR and return the timestamp value for this. How |
2468 | next midnight after \f(CW\*(C`now\*(C'\fR and return the timestamp value for this. How |
… | |
… | |
2544 | only within the same loop, i.e. you can watch for \f(CW\*(C`SIGINT\*(C'\fR in your |
2560 | only within the same loop, i.e. you can watch for \f(CW\*(C`SIGINT\*(C'\fR in your |
2545 | default loop and for \f(CW\*(C`SIGIO\*(C'\fR in another loop, but you cannot watch for |
2561 | default loop and for \f(CW\*(C`SIGIO\*(C'\fR in another loop, but you cannot watch for |
2546 | \&\f(CW\*(C`SIGINT\*(C'\fR in both the default loop and another loop at the same time. At |
2562 | \&\f(CW\*(C`SIGINT\*(C'\fR in both the default loop and another loop at the same time. At |
2547 | the moment, \f(CW\*(C`SIGCHLD\*(C'\fR is permanently tied to the default loop. |
2563 | the moment, \f(CW\*(C`SIGCHLD\*(C'\fR is permanently tied to the default loop. |
2548 | .PP |
2564 | .PP |
2549 | When the first watcher gets started will libev actually register something |
2565 | Only after the first watcher for a signal is started will libev actually |
2550 | with the kernel (thus it coexists with your own signal handlers as long as |
2566 | register something with the kernel. It thus coexists with your own signal |
2551 | you don't register any with libev for the same signal). |
2567 | handlers as long as you don't register any with libev for the same signal. |
2552 | .PP |
2568 | .PP |
2553 | If possible and supported, libev will install its handlers with |
2569 | If possible and supported, libev will install its handlers with |
2554 | \&\f(CW\*(C`SA_RESTART\*(C'\fR (or equivalent) behaviour enabled, so system calls should |
2570 | \&\f(CW\*(C`SA_RESTART\*(C'\fR (or equivalent) behaviour enabled, so system calls should |
2555 | not be unduly interrupted. If you have a problem with system calls getting |
2571 | not be unduly interrupted. If you have a problem with system calls getting |
2556 | interrupted by signals you can block all signals in an \f(CW\*(C`ev_check\*(C'\fR watcher |
2572 | interrupted by signals you can block all signals in an \f(CW\*(C`ev_check\*(C'\fR watcher |
… | |
… | |
2577 | The simplest way to ensure that the signal mask is reset in the child is |
2593 | The simplest way to ensure that the signal mask is reset in the child is |
2578 | to install a fork handler with \f(CW\*(C`pthread_atfork\*(C'\fR that resets it. That will |
2594 | to install a fork handler with \f(CW\*(C`pthread_atfork\*(C'\fR that resets it. That will |
2579 | catch fork calls done by libraries (such as the libc) as well. |
2595 | catch fork calls done by libraries (such as the libc) as well. |
2580 | .PP |
2596 | .PP |
2581 | In current versions of libev, the signal will not be blocked indefinitely |
2597 | In current versions of libev, the signal will not be blocked indefinitely |
2582 | unless you use the \f(CW\*(C`signalfd\*(C'\fR \s-1API\s0 (\f(CW\*(C`EV_SIGNALFD\*(C'\fR). While this reduces |
2598 | unless you use the \f(CW\*(C`signalfd\*(C'\fR \s-1API \s0(\f(CW\*(C`EV_SIGNALFD\*(C'\fR). While this reduces |
2583 | the window of opportunity for problems, it will not go away, as libev |
2599 | the window of opportunity for problems, it will not go away, as libev |
2584 | \&\fIhas\fR to modify the signal mask, at least temporarily. |
2600 | \&\fIhas\fR to modify the signal mask, at least temporarily. |
2585 | .PP |
2601 | .PP |
2586 | So I can't stress this enough: \fIIf you do not reset your signal mask when |
2602 | So I can't stress this enough: \fIIf you do not reset your signal mask when |
2587 | you expect it to be empty, you have a race condition in your code\fR. This |
2603 | you expect it to be empty, you have a race condition in your code\fR. This |
… | |
… | |
2617 | The signal the watcher watches out for. |
2633 | The signal the watcher watches out for. |
2618 | .PP |
2634 | .PP |
2619 | \fIExamples\fR |
2635 | \fIExamples\fR |
2620 | .IX Subsection "Examples" |
2636 | .IX Subsection "Examples" |
2621 | .PP |
2637 | .PP |
2622 | Example: Try to exit cleanly on \s-1SIGINT\s0. |
2638 | Example: Try to exit cleanly on \s-1SIGINT.\s0 |
2623 | .PP |
2639 | .PP |
2624 | .Vb 5 |
2640 | .Vb 5 |
2625 | \& static void |
2641 | \& static void |
2626 | \& sigint_cb (struct ev_loop *loop, ev_signal *w, int revents) |
2642 | \& sigint_cb (struct ev_loop *loop, ev_signal *w, int revents) |
2627 | \& { |
2643 | \& { |
… | |
… | |
2784 | compilation environment, which means that on systems with large file |
2800 | compilation environment, which means that on systems with large file |
2785 | support disabled by default, you get the 32 bit version of the stat |
2801 | support disabled by default, you get the 32 bit version of the stat |
2786 | structure. When using the library from programs that change the \s-1ABI\s0 to |
2802 | structure. When using the library from programs that change the \s-1ABI\s0 to |
2787 | use 64 bit file offsets the programs will fail. In that case you have to |
2803 | use 64 bit file offsets the programs will fail. In that case you have to |
2788 | compile libev with the same flags to get binary compatibility. This is |
2804 | compile libev with the same flags to get binary compatibility. This is |
2789 | obviously the case with any flags that change the \s-1ABI\s0, but the problem is |
2805 | obviously the case with any flags that change the \s-1ABI,\s0 but the problem is |
2790 | most noticeably displayed with ev_stat and large file support. |
2806 | most noticeably displayed with ev_stat and large file support. |
2791 | .PP |
2807 | .PP |
2792 | The solution for this is to lobby your distribution maker to make large |
2808 | The solution for this is to lobby your distribution maker to make large |
2793 | file interfaces available by default (as e.g. FreeBSD does) and not |
2809 | file interfaces available by default (as e.g. FreeBSD does) and not |
2794 | optional. Libev cannot simply switch on large file support because it has |
2810 | optional. Libev cannot simply switch on large file support because it has |
… | |
… | |
3039 | .IX Subsection "ev_prepare and ev_check - customise your event loop!" |
3055 | .IX Subsection "ev_prepare and ev_check - customise your event loop!" |
3040 | Prepare and check watchers are often (but not always) used in pairs: |
3056 | Prepare and check watchers are often (but not always) used in pairs: |
3041 | prepare watchers get invoked before the process blocks and check watchers |
3057 | prepare watchers get invoked before the process blocks and check watchers |
3042 | afterwards. |
3058 | afterwards. |
3043 | .PP |
3059 | .PP |
3044 | You \fImust not\fR call \f(CW\*(C`ev_run\*(C'\fR or similar functions that enter |
3060 | You \fImust not\fR call \f(CW\*(C`ev_run\*(C'\fR (or similar functions that enter the |
3045 | the current event loop from either \f(CW\*(C`ev_prepare\*(C'\fR or \f(CW\*(C`ev_check\*(C'\fR |
3061 | current event loop) or \f(CW\*(C`ev_loop_fork\*(C'\fR from either \f(CW\*(C`ev_prepare\*(C'\fR or |
3046 | watchers. Other loops than the current one are fine, however. The |
3062 | \&\f(CW\*(C`ev_check\*(C'\fR watchers. Other loops than the current one are fine, |
3047 | rationale behind this is that you do not need to check for recursion in |
3063 | however. The rationale behind this is that you do not need to check |
3048 | those watchers, i.e. the sequence will always be \f(CW\*(C`ev_prepare\*(C'\fR, blocking, |
3064 | for recursion in those watchers, i.e. the sequence will always be |
3049 | \&\f(CW\*(C`ev_check\*(C'\fR so if you have one watcher of each kind they will always be |
3065 | \&\f(CW\*(C`ev_prepare\*(C'\fR, blocking, \f(CW\*(C`ev_check\*(C'\fR so if you have one watcher of each |
3050 | called in pairs bracketing the blocking call. |
3066 | kind they will always be called in pairs bracketing the blocking call. |
3051 | .PP |
3067 | .PP |
3052 | Their main purpose is to integrate other event mechanisms into libev and |
3068 | Their main purpose is to integrate other event mechanisms into libev and |
3053 | their use is somewhat advanced. They could be used, for example, to track |
3069 | their use is somewhat advanced. They could be used, for example, to track |
3054 | variable changes, implement your own watchers, integrate net-snmp or a |
3070 | variable changes, implement your own watchers, integrate net-snmp or a |
3055 | coroutine library and lots more. They are also occasionally useful if |
3071 | coroutine library and lots more. They are also occasionally useful if |
… | |
… | |
3225 | .Ve |
3241 | .Ve |
3226 | .PP |
3242 | .PP |
3227 | Method 4: Do not use a prepare or check watcher because the module you |
3243 | Method 4: Do not use a prepare or check watcher because the module you |
3228 | want to embed is not flexible enough to support it. Instead, you can |
3244 | want to embed is not flexible enough to support it. Instead, you can |
3229 | override their poll function. The drawback with this solution is that the |
3245 | override their poll function. The drawback with this solution is that the |
3230 | main loop is now no longer controllable by \s-1EV\s0. The \f(CW\*(C`Glib::EV\*(C'\fR module uses |
3246 | main loop is now no longer controllable by \s-1EV.\s0 The \f(CW\*(C`Glib::EV\*(C'\fR module uses |
3231 | this approach, effectively embedding \s-1EV\s0 as a client into the horrible |
3247 | this approach, effectively embedding \s-1EV\s0 as a client into the horrible |
3232 | libglib event loop. |
3248 | libglib event loop. |
3233 | .PP |
3249 | .PP |
3234 | .Vb 4 |
3250 | .Vb 4 |
3235 | \& static gint |
3251 | \& static gint |
… | |
… | |
3349 | .PP |
3365 | .PP |
3350 | .Vb 3 |
3366 | .Vb 3 |
3351 | \& struct ev_loop *loop_hi = ev_default_init (0); |
3367 | \& struct ev_loop *loop_hi = ev_default_init (0); |
3352 | \& struct ev_loop *loop_lo = 0; |
3368 | \& struct ev_loop *loop_lo = 0; |
3353 | \& ev_embed embed; |
3369 | \& ev_embed embed; |
3354 | \& |
3370 | \& |
3355 | \& // see if there is a chance of getting one that works |
3371 | \& // see if there is a chance of getting one that works |
3356 | \& // (remember that a flags value of 0 means autodetection) |
3372 | \& // (remember that a flags value of 0 means autodetection) |
3357 | \& loop_lo = ev_embeddable_backends () & ev_recommended_backends () |
3373 | \& loop_lo = ev_embeddable_backends () & ev_recommended_backends () |
3358 | \& ? ev_loop_new (ev_embeddable_backends () & ev_recommended_backends ()) |
3374 | \& ? ev_loop_new (ev_embeddable_backends () & ev_recommended_backends ()) |
3359 | \& : 0; |
3375 | \& : 0; |
… | |
… | |
3375 | .PP |
3391 | .PP |
3376 | .Vb 3 |
3392 | .Vb 3 |
3377 | \& struct ev_loop *loop = ev_default_init (0); |
3393 | \& struct ev_loop *loop = ev_default_init (0); |
3378 | \& struct ev_loop *loop_socket = 0; |
3394 | \& struct ev_loop *loop_socket = 0; |
3379 | \& ev_embed embed; |
3395 | \& ev_embed embed; |
3380 | \& |
3396 | \& |
3381 | \& if (ev_supported_backends () & ~ev_recommended_backends () & EVBACKEND_KQUEUE) |
3397 | \& if (ev_supported_backends () & ~ev_recommended_backends () & EVBACKEND_KQUEUE) |
3382 | \& if ((loop_socket = ev_loop_new (EVBACKEND_KQUEUE)) |
3398 | \& if ((loop_socket = ev_loop_new (EVBACKEND_KQUEUE)) |
3383 | \& { |
3399 | \& { |
3384 | \& ev_embed_init (&embed, 0, loop_socket); |
3400 | \& ev_embed_init (&embed, 0, loop_socket); |
3385 | \& ev_embed_start (loop, &embed); |
3401 | \& ev_embed_start (loop, &embed); |
… | |
… | |
3402 | of course. |
3418 | of course. |
3403 | .PP |
3419 | .PP |
3404 | \fIThe special problem of life after fork \- how is it possible?\fR |
3420 | \fIThe special problem of life after fork \- how is it possible?\fR |
3405 | .IX Subsection "The special problem of life after fork - how is it possible?" |
3421 | .IX Subsection "The special problem of life after fork - how is it possible?" |
3406 | .PP |
3422 | .PP |
3407 | Most uses of \f(CW\*(C`fork()\*(C'\fR consist of forking, then some simple calls to set |
3423 | Most uses of \f(CW\*(C`fork ()\*(C'\fR consist of forking, then some simple calls to set |
3408 | up/change the process environment, followed by a call to \f(CW\*(C`exec()\*(C'\fR. This |
3424 | up/change the process environment, followed by a call to \f(CW\*(C`exec()\*(C'\fR. This |
3409 | sequence should be handled by libev without any problems. |
3425 | sequence should be handled by libev without any problems. |
3410 | .PP |
3426 | .PP |
3411 | This changes when the application actually wants to do event handling |
3427 | This changes when the application actually wants to do event handling |
3412 | in the child, or both parent in child, in effect \*(L"continuing\*(R" after the |
3428 | in the child, or both parent in child, in effect \*(L"continuing\*(R" after the |
… | |
… | |
3652 | \&\f(CW\*(C`EV_ERROR\*(C'\fR, \f(CW\*(C`EV_READ\*(C'\fR, \f(CW\*(C`EV_WRITE\*(C'\fR or \f(CW\*(C`EV_TIMER\*(C'\fR) and the \f(CW\*(C`arg\*(C'\fR |
3668 | \&\f(CW\*(C`EV_ERROR\*(C'\fR, \f(CW\*(C`EV_READ\*(C'\fR, \f(CW\*(C`EV_WRITE\*(C'\fR or \f(CW\*(C`EV_TIMER\*(C'\fR) and the \f(CW\*(C`arg\*(C'\fR |
3653 | value passed to \f(CW\*(C`ev_once\*(C'\fR. Note that it is possible to receive \fIboth\fR |
3669 | value passed to \f(CW\*(C`ev_once\*(C'\fR. Note that it is possible to receive \fIboth\fR |
3654 | a timeout and an io event at the same time \- you probably should give io |
3670 | a timeout and an io event at the same time \- you probably should give io |
3655 | events precedence. |
3671 | events precedence. |
3656 | .Sp |
3672 | .Sp |
3657 | Example: wait up to ten seconds for data to appear on \s-1STDIN_FILENO\s0. |
3673 | Example: wait up to ten seconds for data to appear on \s-1STDIN_FILENO.\s0 |
3658 | .Sp |
3674 | .Sp |
3659 | .Vb 7 |
3675 | .Vb 7 |
3660 | \& static void stdin_ready (int revents, void *arg) |
3676 | \& static void stdin_ready (int revents, void *arg) |
3661 | \& { |
3677 | \& { |
3662 | \& if (revents & EV_READ) |
3678 | \& if (revents & EV_READ) |
… | |
… | |
3678 | .SH "COMMON OR USEFUL IDIOMS (OR BOTH)" |
3694 | .SH "COMMON OR USEFUL IDIOMS (OR BOTH)" |
3679 | .IX Header "COMMON OR USEFUL IDIOMS (OR BOTH)" |
3695 | .IX Header "COMMON OR USEFUL IDIOMS (OR BOTH)" |
3680 | This section explains some common idioms that are not immediately |
3696 | This section explains some common idioms that are not immediately |
3681 | obvious. Note that examples are sprinkled over the whole manual, and this |
3697 | obvious. Note that examples are sprinkled over the whole manual, and this |
3682 | section only contains stuff that wouldn't fit anywhere else. |
3698 | section only contains stuff that wouldn't fit anywhere else. |
3683 | .SS "\s-1ASSOCIATING\s0 \s-1CUSTOM\s0 \s-1DATA\s0 \s-1WITH\s0 A \s-1WATCHER\s0" |
3699 | .SS "\s-1ASSOCIATING CUSTOM DATA WITH A WATCHER\s0" |
3684 | .IX Subsection "ASSOCIATING CUSTOM DATA WITH A WATCHER" |
3700 | .IX Subsection "ASSOCIATING CUSTOM DATA WITH A WATCHER" |
3685 | Each watcher has, by default, a \f(CW\*(C`void *data\*(C'\fR member that you can read |
3701 | Each watcher has, by default, a \f(CW\*(C`void *data\*(C'\fR member that you can read |
3686 | or modify at any time: libev will completely ignore it. This can be used |
3702 | or modify at any time: libev will completely ignore it. This can be used |
3687 | to associate arbitrary data with your watcher. If you need more data and |
3703 | to associate arbitrary data with your watcher. If you need more data and |
3688 | don't want to allocate memory separately and store a pointer to it in that |
3704 | don't want to allocate memory separately and store a pointer to it in that |
… | |
… | |
3714 | \& } |
3730 | \& } |
3715 | .Ve |
3731 | .Ve |
3716 | .PP |
3732 | .PP |
3717 | More interesting and less C\-conformant ways of casting your callback |
3733 | More interesting and less C\-conformant ways of casting your callback |
3718 | function type instead have been omitted. |
3734 | function type instead have been omitted. |
3719 | .SS "\s-1BUILDING\s0 \s-1YOUR\s0 \s-1OWN\s0 \s-1COMPOSITE\s0 \s-1WATCHERS\s0" |
3735 | .SS "\s-1BUILDING YOUR OWN COMPOSITE WATCHERS\s0" |
3720 | .IX Subsection "BUILDING YOUR OWN COMPOSITE WATCHERS" |
3736 | .IX Subsection "BUILDING YOUR OWN COMPOSITE WATCHERS" |
3721 | Another common scenario is to use some data structure with multiple |
3737 | Another common scenario is to use some data structure with multiple |
3722 | embedded watchers, in effect creating your own watcher that combines |
3738 | embedded watchers, in effect creating your own watcher that combines |
3723 | multiple libev event sources into one \*(L"super-watcher\*(R": |
3739 | multiple libev event sources into one \*(L"super-watcher\*(R": |
3724 | .PP |
3740 | .PP |
… | |
… | |
3752 | \& { |
3768 | \& { |
3753 | \& struct my_biggy big = (struct my_biggy *) |
3769 | \& struct my_biggy big = (struct my_biggy *) |
3754 | \& (((char *)w) \- offsetof (struct my_biggy, t2)); |
3770 | \& (((char *)w) \- offsetof (struct my_biggy, t2)); |
3755 | \& } |
3771 | \& } |
3756 | .Ve |
3772 | .Ve |
3757 | .SS "\s-1AVOIDING\s0 \s-1FINISHING\s0 \s-1BEFORE\s0 \s-1RETURNING\s0" |
3773 | .SS "\s-1AVOIDING FINISHING BEFORE RETURNING\s0" |
3758 | .IX Subsection "AVOIDING FINISHING BEFORE RETURNING" |
3774 | .IX Subsection "AVOIDING FINISHING BEFORE RETURNING" |
3759 | Often you have structures like this in event-based programs: |
3775 | Often you have structures like this in event-based programs: |
3760 | .PP |
3776 | .PP |
3761 | .Vb 4 |
3777 | .Vb 4 |
3762 | \& callback () |
3778 | \& callback () |
… | |
… | |
3795 | \& ev_feed_event (EV_A_ watcher, 0); |
3811 | \& ev_feed_event (EV_A_ watcher, 0); |
3796 | .Ve |
3812 | .Ve |
3797 | .PP |
3813 | .PP |
3798 | This way, \f(CW\*(C`start_new_request\*(C'\fR can safely return before the callback is |
3814 | This way, \f(CW\*(C`start_new_request\*(C'\fR can safely return before the callback is |
3799 | invoked, while not delaying callback invocation too much. |
3815 | invoked, while not delaying callback invocation too much. |
3800 | .SS "\s-1MODEL/NESTED\s0 \s-1EVENT\s0 \s-1LOOP\s0 \s-1INVOCATIONS\s0 \s-1AND\s0 \s-1EXIT\s0 \s-1CONDITIONS\s0" |
3816 | .SS "\s-1MODEL/NESTED EVENT LOOP INVOCATIONS AND EXIT CONDITIONS\s0" |
3801 | .IX Subsection "MODEL/NESTED EVENT LOOP INVOCATIONS AND EXIT CONDITIONS" |
3817 | .IX Subsection "MODEL/NESTED EVENT LOOP INVOCATIONS AND EXIT CONDITIONS" |
3802 | Often (especially in \s-1GUI\s0 toolkits) there are places where you have |
3818 | Often (especially in \s-1GUI\s0 toolkits) there are places where you have |
3803 | \&\fImodal\fR interaction, which is most easily implemented by recursively |
3819 | \&\fImodal\fR interaction, which is most easily implemented by recursively |
3804 | invoking \f(CW\*(C`ev_run\*(C'\fR. |
3820 | invoking \f(CW\*(C`ev_run\*(C'\fR. |
3805 | .PP |
3821 | .PP |
… | |
… | |
3837 | \& exit_main_loop = 1; |
3853 | \& exit_main_loop = 1; |
3838 | \& |
3854 | \& |
3839 | \& // exit both |
3855 | \& // exit both |
3840 | \& exit_main_loop = exit_nested_loop = 1; |
3856 | \& exit_main_loop = exit_nested_loop = 1; |
3841 | .Ve |
3857 | .Ve |
3842 | .SS "\s-1THREAD\s0 \s-1LOCKING\s0 \s-1EXAMPLE\s0" |
3858 | .SS "\s-1THREAD LOCKING EXAMPLE\s0" |
3843 | .IX Subsection "THREAD LOCKING EXAMPLE" |
3859 | .IX Subsection "THREAD LOCKING EXAMPLE" |
3844 | Here is a fictitious example of how to run an event loop in a different |
3860 | Here is a fictitious example of how to run an event loop in a different |
3845 | thread from where callbacks are being invoked and watchers are |
3861 | thread from where callbacks are being invoked and watchers are |
3846 | created/added/removed. |
3862 | created/added/removed. |
3847 | .PP |
3863 | .PP |
… | |
… | |
3988 | .PP |
4004 | .PP |
3989 | Note that sending the \f(CW\*(C`ev_async\*(C'\fR watcher is required because otherwise |
4005 | Note that sending the \f(CW\*(C`ev_async\*(C'\fR watcher is required because otherwise |
3990 | an event loop currently blocking in the kernel will have no knowledge |
4006 | an event loop currently blocking in the kernel will have no knowledge |
3991 | about the newly added timer. By waking up the loop it will pick up any new |
4007 | about the newly added timer. By waking up the loop it will pick up any new |
3992 | watchers in the next event loop iteration. |
4008 | watchers in the next event loop iteration. |
3993 | .SS "\s-1THREADS\s0, \s-1COROUTINES\s0, \s-1CONTINUATIONS\s0, \s-1QUEUES\s0... \s-1INSTEAD\s0 \s-1OF\s0 \s-1CALLBACKS\s0" |
4009 | .SS "\s-1THREADS, COROUTINES, CONTINUATIONS, QUEUES... INSTEAD OF CALLBACKS\s0" |
3994 | .IX Subsection "THREADS, COROUTINES, CONTINUATIONS, QUEUES... INSTEAD OF CALLBACKS" |
4010 | .IX Subsection "THREADS, COROUTINES, CONTINUATIONS, QUEUES... INSTEAD OF CALLBACKS" |
3995 | While the overhead of a callback that e.g. schedules a thread is small, it |
4011 | While the overhead of a callback that e.g. schedules a thread is small, it |
3996 | is still an overhead. If you embed libev, and your main usage is with some |
4012 | is still an overhead. If you embed libev, and your main usage is with some |
3997 | kind of threads or coroutines, you might want to customise libev so that |
4013 | kind of threads or coroutines, you might want to customise libev so that |
3998 | doesn't need callbacks anymore. |
4014 | doesn't need callbacks anymore. |
… | |
… | |
4034 | You can do similar tricks if you have, say, threads with an event queue \- |
4050 | You can do similar tricks if you have, say, threads with an event queue \- |
4035 | instead of storing a coroutine, you store the queue object and instead of |
4051 | instead of storing a coroutine, you store the queue object and instead of |
4036 | switching to a coroutine, you push the watcher onto the queue and notify |
4052 | switching to a coroutine, you push the watcher onto the queue and notify |
4037 | any waiters. |
4053 | any waiters. |
4038 | .PP |
4054 | .PP |
4039 | To embed libev, see \*(L"\s-1EMBEDDING\s0\*(R", but in short, it's easiest to create two |
4055 | To embed libev, see \*(L"\s-1EMBEDDING\*(R"\s0, but in short, it's easiest to create two |
4040 | files, \fImy_ev.h\fR and \fImy_ev.c\fR that include the respective libev files: |
4056 | files, \fImy_ev.h\fR and \fImy_ev.c\fR that include the respective libev files: |
4041 | .PP |
4057 | .PP |
4042 | .Vb 4 |
4058 | .Vb 4 |
4043 | \& // my_ev.h |
4059 | \& // my_ev.h |
4044 | \& #define EV_CB_DECLARE(type) struct my_coro *cb; |
4060 | \& #define EV_CB_DECLARE(type) struct my_coro *cb; |
4045 | \& #define EV_CB_INVOKE(watcher) switch_to ((watcher)\->cb); |
4061 | \& #define EV_CB_INVOKE(watcher) switch_to ((watcher)\->cb) |
4046 | \& #include "../libev/ev.h" |
4062 | \& #include "../libev/ev.h" |
4047 | \& |
4063 | \& |
4048 | \& // my_ev.c |
4064 | \& // my_ev.c |
4049 | \& #define EV_H "my_ev.h" |
4065 | \& #define EV_H "my_ev.h" |
4050 | \& #include "../libev/ev.c" |
4066 | \& #include "../libev/ev.c" |
… | |
… | |
4236 | \& void operator() (ev::io &w, int revents) |
4252 | \& void operator() (ev::io &w, int revents) |
4237 | \& { |
4253 | \& { |
4238 | \& ... |
4254 | \& ... |
4239 | \& } |
4255 | \& } |
4240 | \& } |
4256 | \& } |
4241 | \& |
4257 | \& |
4242 | \& myfunctor f; |
4258 | \& myfunctor f; |
4243 | \& |
4259 | \& |
4244 | \& ev::io w; |
4260 | \& ev::io w; |
4245 | \& w.set (&f); |
4261 | \& w.set (&f); |
4246 | .Ve |
4262 | .Ve |
… | |
… | |
4339 | there are additional modules that implement libev-compatible interfaces |
4355 | there are additional modules that implement libev-compatible interfaces |
4340 | to \f(CW\*(C`libadns\*(C'\fR (\f(CW\*(C`EV::ADNS\*(C'\fR, but \f(CW\*(C`AnyEvent::DNS\*(C'\fR is preferred nowadays), |
4356 | to \f(CW\*(C`libadns\*(C'\fR (\f(CW\*(C`EV::ADNS\*(C'\fR, but \f(CW\*(C`AnyEvent::DNS\*(C'\fR is preferred nowadays), |
4341 | \&\f(CW\*(C`Net::SNMP\*(C'\fR (\f(CW\*(C`Net::SNMP::EV\*(C'\fR) and the \f(CW\*(C`libglib\*(C'\fR event core (\f(CW\*(C`Glib::EV\*(C'\fR |
4357 | \&\f(CW\*(C`Net::SNMP\*(C'\fR (\f(CW\*(C`Net::SNMP::EV\*(C'\fR) and the \f(CW\*(C`libglib\*(C'\fR event core (\f(CW\*(C`Glib::EV\*(C'\fR |
4342 | and \f(CW\*(C`EV::Glib\*(C'\fR). |
4358 | and \f(CW\*(C`EV::Glib\*(C'\fR). |
4343 | .Sp |
4359 | .Sp |
4344 | It can be found and installed via \s-1CPAN\s0, its homepage is at |
4360 | It can be found and installed via \s-1CPAN,\s0 its homepage is at |
4345 | <http://software.schmorp.de/pkg/EV>. |
4361 | <http://software.schmorp.de/pkg/EV>. |
4346 | .IP "Python" 4 |
4362 | .IP "Python" 4 |
4347 | .IX Item "Python" |
4363 | .IX Item "Python" |
4348 | Python bindings can be found at <http://code.google.com/p/pyev/>. It |
4364 | Python bindings can be found at <http://code.google.com/p/pyev/>. It |
4349 | seems to be quite complete and well-documented. |
4365 | seems to be quite complete and well-documented. |
… | |
… | |
4357 | Roger Pack reports that using the link order \f(CW\*(C`\-lws2_32 \-lmsvcrt\-ruby\-190\*(C'\fR |
4373 | Roger Pack reports that using the link order \f(CW\*(C`\-lws2_32 \-lmsvcrt\-ruby\-190\*(C'\fR |
4358 | makes rev work even on mingw. |
4374 | makes rev work even on mingw. |
4359 | .IP "Haskell" 4 |
4375 | .IP "Haskell" 4 |
4360 | .IX Item "Haskell" |
4376 | .IX Item "Haskell" |
4361 | A haskell binding to libev is available at |
4377 | A haskell binding to libev is available at |
4362 | http://hackage.haskell.org/cgi\-bin/hackage\-scripts/package/hlibev <http://hackage.haskell.org/cgi-bin/hackage-scripts/package/hlibev>. |
4378 | <http://hackage.haskell.org/cgi\-bin/hackage\-scripts/package/hlibev>. |
4363 | .IP "D" 4 |
4379 | .IP "D" 4 |
4364 | .IX Item "D" |
4380 | .IX Item "D" |
4365 | Leandro Lucarella has written a D language binding (\fIev.d\fR) for libev, to |
4381 | Leandro Lucarella has written a D language binding (\fIev.d\fR) for libev, to |
4366 | be found at <http://www.llucax.com.ar/proj/ev.d/index.html>. |
4382 | be found at <http://www.llucax.com.ar/proj/ev.d/index.html>. |
4367 | .IP "Ocaml" 4 |
4383 | .IP "Ocaml" 4 |
4368 | .IX Item "Ocaml" |
4384 | .IX Item "Ocaml" |
4369 | Erkki Seppala has written Ocaml bindings for libev, to be found at |
4385 | Erkki Seppala has written Ocaml bindings for libev, to be found at |
4370 | http://modeemi.cs.tut.fi/~flux/software/ocaml\-ev/ <http://modeemi.cs.tut.fi/~flux/software/ocaml-ev/>. |
4386 | <http://modeemi.cs.tut.fi/~flux/software/ocaml\-ev/>. |
4371 | .IP "Lua" 4 |
4387 | .IP "Lua" 4 |
4372 | .IX Item "Lua" |
4388 | .IX Item "Lua" |
4373 | Brian Maher has written a partial interface to libev for lua (at the |
4389 | Brian Maher has written a partial interface to libev for lua (at the |
4374 | time of this writing, only \f(CW\*(C`ev_io\*(C'\fR and \f(CW\*(C`ev_timer\*(C'\fR), to be found at |
4390 | time of this writing, only \f(CW\*(C`ev_io\*(C'\fR and \f(CW\*(C`ev_timer\*(C'\fR), to be found at |
4375 | http://github.com/brimworks/lua\-ev <http://github.com/brimworks/lua-ev>. |
4391 | <http://github.com/brimworks/lua\-ev>. |
4376 | .IP "Javascript" 4 |
4392 | .IP "Javascript" 4 |
4377 | .IX Item "Javascript" |
4393 | .IX Item "Javascript" |
4378 | Node.js (<http://nodejs.org>) uses libev as the underlying event library. |
4394 | Node.js (<http://nodejs.org>) uses libev as the underlying event library. |
4379 | .IP "Others" 4 |
4395 | .IP "Others" 4 |
4380 | .IX Item "Others" |
4396 | .IX Item "Others" |
… | |
… | |
4469 | .SS "\s-1FILESETS\s0" |
4485 | .SS "\s-1FILESETS\s0" |
4470 | .IX Subsection "FILESETS" |
4486 | .IX Subsection "FILESETS" |
4471 | Depending on what features you need you need to include one or more sets of files |
4487 | Depending on what features you need you need to include one or more sets of files |
4472 | in your application. |
4488 | in your application. |
4473 | .PP |
4489 | .PP |
4474 | \fI\s-1CORE\s0 \s-1EVENT\s0 \s-1LOOP\s0\fR |
4490 | \fI\s-1CORE EVENT LOOP\s0\fR |
4475 | .IX Subsection "CORE EVENT LOOP" |
4491 | .IX Subsection "CORE EVENT LOOP" |
4476 | .PP |
4492 | .PP |
4477 | To include only the libev core (all the \f(CW\*(C`ev_*\*(C'\fR functions), with manual |
4493 | To include only the libev core (all the \f(CW\*(C`ev_*\*(C'\fR functions), with manual |
4478 | configuration (no autoconf): |
4494 | configuration (no autoconf): |
4479 | .PP |
4495 | .PP |
… | |
… | |
4482 | \& #include "ev.c" |
4498 | \& #include "ev.c" |
4483 | .Ve |
4499 | .Ve |
4484 | .PP |
4500 | .PP |
4485 | This will automatically include \fIev.h\fR, too, and should be done in a |
4501 | This will automatically include \fIev.h\fR, too, and should be done in a |
4486 | single C source file only to provide the function implementations. To use |
4502 | single C source file only to provide the function implementations. To use |
4487 | it, do the same for \fIev.h\fR in all files wishing to use this \s-1API\s0 (best |
4503 | it, do the same for \fIev.h\fR in all files wishing to use this \s-1API \s0(best |
4488 | done by writing a wrapper around \fIev.h\fR that you can include instead and |
4504 | done by writing a wrapper around \fIev.h\fR that you can include instead and |
4489 | where you can put other configuration options): |
4505 | where you can put other configuration options): |
4490 | .PP |
4506 | .PP |
4491 | .Vb 2 |
4507 | .Vb 2 |
4492 | \& #define EV_STANDALONE 1 |
4508 | \& #define EV_STANDALONE 1 |
… | |
… | |
4506 | \& ev_vars.h |
4522 | \& ev_vars.h |
4507 | \& ev_wrap.h |
4523 | \& ev_wrap.h |
4508 | \& |
4524 | \& |
4509 | \& ev_win32.c required on win32 platforms only |
4525 | \& ev_win32.c required on win32 platforms only |
4510 | \& |
4526 | \& |
4511 | \& ev_select.c only when select backend is enabled (which is enabled by default) |
4527 | \& ev_select.c only when select backend is enabled |
4512 | \& ev_poll.c only when poll backend is enabled (disabled by default) |
4528 | \& ev_poll.c only when poll backend is enabled |
4513 | \& ev_epoll.c only when the epoll backend is enabled (disabled by default) |
4529 | \& ev_epoll.c only when the epoll backend is enabled |
4514 | \& ev_kqueue.c only when the kqueue backend is enabled (disabled by default) |
4530 | \& ev_kqueue.c only when the kqueue backend is enabled |
4515 | \& ev_port.c only when the solaris port backend is enabled (disabled by default) |
4531 | \& ev_port.c only when the solaris port backend is enabled |
4516 | .Ve |
4532 | .Ve |
4517 | .PP |
4533 | .PP |
4518 | \&\fIev.c\fR includes the backend files directly when enabled, so you only need |
4534 | \&\fIev.c\fR includes the backend files directly when enabled, so you only need |
4519 | to compile this single file. |
4535 | to compile this single file. |
4520 | .PP |
4536 | .PP |
4521 | \fI\s-1LIBEVENT\s0 \s-1COMPATIBILITY\s0 \s-1API\s0\fR |
4537 | \fI\s-1LIBEVENT COMPATIBILITY API\s0\fR |
4522 | .IX Subsection "LIBEVENT COMPATIBILITY API" |
4538 | .IX Subsection "LIBEVENT COMPATIBILITY API" |
4523 | .PP |
4539 | .PP |
4524 | To include the libevent compatibility \s-1API\s0, also include: |
4540 | To include the libevent compatibility \s-1API,\s0 also include: |
4525 | .PP |
4541 | .PP |
4526 | .Vb 1 |
4542 | .Vb 1 |
4527 | \& #include "event.c" |
4543 | \& #include "event.c" |
4528 | .Ve |
4544 | .Ve |
4529 | .PP |
4545 | .PP |
… | |
… | |
4531 | .PP |
4547 | .PP |
4532 | .Vb 1 |
4548 | .Vb 1 |
4533 | \& #include "event.h" |
4549 | \& #include "event.h" |
4534 | .Ve |
4550 | .Ve |
4535 | .PP |
4551 | .PP |
4536 | in the files that want to use the libevent \s-1API\s0. This also includes \fIev.h\fR. |
4552 | in the files that want to use the libevent \s-1API.\s0 This also includes \fIev.h\fR. |
4537 | .PP |
4553 | .PP |
4538 | You need the following additional files for this: |
4554 | You need the following additional files for this: |
4539 | .PP |
4555 | .PP |
4540 | .Vb 2 |
4556 | .Vb 2 |
4541 | \& event.h |
4557 | \& event.h |
4542 | \& event.c |
4558 | \& event.c |
4543 | .Ve |
4559 | .Ve |
4544 | .PP |
4560 | .PP |
4545 | \fI\s-1AUTOCONF\s0 \s-1SUPPORT\s0\fR |
4561 | \fI\s-1AUTOCONF SUPPORT\s0\fR |
4546 | .IX Subsection "AUTOCONF SUPPORT" |
4562 | .IX Subsection "AUTOCONF SUPPORT" |
4547 | .PP |
4563 | .PP |
4548 | Instead of using \f(CW\*(C`EV_STANDALONE=1\*(C'\fR and providing your configuration in |
4564 | Instead of using \f(CW\*(C`EV_STANDALONE=1\*(C'\fR and providing your configuration in |
4549 | whatever way you want, you can also \f(CW\*(C`m4_include([libev.m4])\*(C'\fR in your |
4565 | whatever way you want, you can also \f(CW\*(C`m4_include([libev.m4])\*(C'\fR in your |
4550 | \&\fIconfigure.ac\fR and leave \f(CW\*(C`EV_STANDALONE\*(C'\fR undefined. \fIev.c\fR will then |
4566 | \&\fIconfigure.ac\fR and leave \f(CW\*(C`EV_STANDALONE\*(C'\fR undefined. \fIev.c\fR will then |
… | |
… | |
4553 | For this of course you need the m4 file: |
4569 | For this of course you need the m4 file: |
4554 | .PP |
4570 | .PP |
4555 | .Vb 1 |
4571 | .Vb 1 |
4556 | \& libev.m4 |
4572 | \& libev.m4 |
4557 | .Ve |
4573 | .Ve |
4558 | .SS "\s-1PREPROCESSOR\s0 \s-1SYMBOLS/MACROS\s0" |
4574 | .SS "\s-1PREPROCESSOR SYMBOLS/MACROS\s0" |
4559 | .IX Subsection "PREPROCESSOR SYMBOLS/MACROS" |
4575 | .IX Subsection "PREPROCESSOR SYMBOLS/MACROS" |
4560 | Libev can be configured via a variety of preprocessor symbols you have to |
4576 | Libev can be configured via a variety of preprocessor symbols you have to |
4561 | define before including (or compiling) any of its files. The default in |
4577 | define before including (or compiling) any of its files. The default in |
4562 | the absence of autoconf is documented for every option. |
4578 | the absence of autoconf is documented for every option. |
4563 | .PP |
4579 | .PP |
4564 | Symbols marked with \*(L"(h)\*(R" do not change the \s-1ABI\s0, and can have different |
4580 | Symbols marked with \*(L"(h)\*(R" do not change the \s-1ABI,\s0 and can have different |
4565 | values when compiling libev vs. including \fIev.h\fR, so it is permissible |
4581 | values when compiling libev vs. including \fIev.h\fR, so it is permissible |
4566 | to redefine them before including \fIev.h\fR without breaking compatibility |
4582 | to redefine them before including \fIev.h\fR without breaking compatibility |
4567 | to a compiled library. All other symbols change the \s-1ABI\s0, which means all |
4583 | to a compiled library. All other symbols change the \s-1ABI,\s0 which means all |
4568 | users of libev and the libev code itself must be compiled with compatible |
4584 | users of libev and the libev code itself must be compiled with compatible |
4569 | settings. |
4585 | settings. |
4570 | .IP "\s-1EV_COMPAT3\s0 (h)" 4 |
4586 | .IP "\s-1EV_COMPAT3 \s0(h)" 4 |
4571 | .IX Item "EV_COMPAT3 (h)" |
4587 | .IX Item "EV_COMPAT3 (h)" |
4572 | Backwards compatibility is a major concern for libev. This is why this |
4588 | Backwards compatibility is a major concern for libev. This is why this |
4573 | release of libev comes with wrappers for the functions and symbols that |
4589 | release of libev comes with wrappers for the functions and symbols that |
4574 | have been renamed between libev version 3 and 4. |
4590 | have been renamed between libev version 3 and 4. |
4575 | .Sp |
4591 | .Sp |
… | |
… | |
4580 | typedef in that case. |
4596 | typedef in that case. |
4581 | .Sp |
4597 | .Sp |
4582 | In some future version, the default for \f(CW\*(C`EV_COMPAT3\*(C'\fR will become \f(CW0\fR, |
4598 | In some future version, the default for \f(CW\*(C`EV_COMPAT3\*(C'\fR will become \f(CW0\fR, |
4583 | and in some even more future version the compatibility code will be |
4599 | and in some even more future version the compatibility code will be |
4584 | removed completely. |
4600 | removed completely. |
4585 | .IP "\s-1EV_STANDALONE\s0 (h)" 4 |
4601 | .IP "\s-1EV_STANDALONE \s0(h)" 4 |
4586 | .IX Item "EV_STANDALONE (h)" |
4602 | .IX Item "EV_STANDALONE (h)" |
4587 | Must always be \f(CW1\fR if you do not use autoconf configuration, which |
4603 | Must always be \f(CW1\fR if you do not use autoconf configuration, which |
4588 | keeps libev from including \fIconfig.h\fR, and it also defines dummy |
4604 | keeps libev from including \fIconfig.h\fR, and it also defines dummy |
4589 | implementations for some libevent functions (such as logging, which is not |
4605 | implementations for some libevent functions (such as logging, which is not |
4590 | supported). It will also not define any of the structs usually found in |
4606 | supported). It will also not define any of the structs usually found in |
… | |
… | |
4748 | handler \*(L"locking\*(R" as well as for signal and thread safety in \f(CW\*(C`ev_async\*(C'\fR |
4764 | handler \*(L"locking\*(R" as well as for signal and thread safety in \f(CW\*(C`ev_async\*(C'\fR |
4749 | watchers. |
4765 | watchers. |
4750 | .Sp |
4766 | .Sp |
4751 | In the absence of this define, libev will use \f(CW\*(C`sig_atomic_t volatile\*(C'\fR |
4767 | In the absence of this define, libev will use \f(CW\*(C`sig_atomic_t volatile\*(C'\fR |
4752 | (from \fIsignal.h\fR), which is usually good enough on most platforms. |
4768 | (from \fIsignal.h\fR), which is usually good enough on most platforms. |
4753 | .IP "\s-1EV_H\s0 (h)" 4 |
4769 | .IP "\s-1EV_H \s0(h)" 4 |
4754 | .IX Item "EV_H (h)" |
4770 | .IX Item "EV_H (h)" |
4755 | The name of the \fIev.h\fR header file used to include it. The default if |
4771 | The name of the \fIev.h\fR header file used to include it. The default if |
4756 | undefined is \f(CW"ev.h"\fR in \fIevent.h\fR, \fIev.c\fR and \fIev++.h\fR. This can be |
4772 | undefined is \f(CW"ev.h"\fR in \fIevent.h\fR, \fIev.c\fR and \fIev++.h\fR. This can be |
4757 | used to virtually rename the \fIev.h\fR header file in case of conflicts. |
4773 | used to virtually rename the \fIev.h\fR header file in case of conflicts. |
4758 | .IP "\s-1EV_CONFIG_H\s0 (h)" 4 |
4774 | .IP "\s-1EV_CONFIG_H \s0(h)" 4 |
4759 | .IX Item "EV_CONFIG_H (h)" |
4775 | .IX Item "EV_CONFIG_H (h)" |
4760 | If \f(CW\*(C`EV_STANDALONE\*(C'\fR isn't \f(CW1\fR, this variable can be used to override |
4776 | If \f(CW\*(C`EV_STANDALONE\*(C'\fR isn't \f(CW1\fR, this variable can be used to override |
4761 | \&\fIev.c\fR's idea of where to find the \fIconfig.h\fR file, similarly to |
4777 | \&\fIev.c\fR's idea of where to find the \fIconfig.h\fR file, similarly to |
4762 | \&\f(CW\*(C`EV_H\*(C'\fR, above. |
4778 | \&\f(CW\*(C`EV_H\*(C'\fR, above. |
4763 | .IP "\s-1EV_EVENT_H\s0 (h)" 4 |
4779 | .IP "\s-1EV_EVENT_H \s0(h)" 4 |
4764 | .IX Item "EV_EVENT_H (h)" |
4780 | .IX Item "EV_EVENT_H (h)" |
4765 | Similarly to \f(CW\*(C`EV_H\*(C'\fR, this macro can be used to override \fIevent.c\fR's idea |
4781 | Similarly to \f(CW\*(C`EV_H\*(C'\fR, this macro can be used to override \fIevent.c\fR's idea |
4766 | of how the \fIevent.h\fR header can be found, the default is \f(CW"event.h"\fR. |
4782 | of how the \fIevent.h\fR header can be found, the default is \f(CW"event.h"\fR. |
4767 | .IP "\s-1EV_PROTOTYPES\s0 (h)" 4 |
4783 | .IP "\s-1EV_PROTOTYPES \s0(h)" 4 |
4768 | .IX Item "EV_PROTOTYPES (h)" |
4784 | .IX Item "EV_PROTOTYPES (h)" |
4769 | If defined to be \f(CW0\fR, then \fIev.h\fR will not define any function |
4785 | If defined to be \f(CW0\fR, then \fIev.h\fR will not define any function |
4770 | prototypes, but still define all the structs and other symbols. This is |
4786 | prototypes, but still define all the structs and other symbols. This is |
4771 | occasionally useful if you want to provide your own wrapper functions |
4787 | occasionally useful if you want to provide your own wrapper functions |
4772 | around libev functions. |
4788 | around libev functions. |
… | |
… | |
4796 | all the priorities, so having many of them (hundreds) uses a lot of space |
4812 | all the priorities, so having many of them (hundreds) uses a lot of space |
4797 | and time, so using the defaults of five priorities (\-2 .. +2) is usually |
4813 | and time, so using the defaults of five priorities (\-2 .. +2) is usually |
4798 | fine. |
4814 | fine. |
4799 | .Sp |
4815 | .Sp |
4800 | If your embedding application does not need any priorities, defining these |
4816 | If your embedding application does not need any priorities, defining these |
4801 | both to \f(CW0\fR will save some memory and \s-1CPU\s0. |
4817 | both to \f(CW0\fR will save some memory and \s-1CPU.\s0 |
4802 | .IP "\s-1EV_PERIODIC_ENABLE\s0, \s-1EV_IDLE_ENABLE\s0, \s-1EV_EMBED_ENABLE\s0, \s-1EV_STAT_ENABLE\s0, \s-1EV_PREPARE_ENABLE\s0, \s-1EV_CHECK_ENABLE\s0, \s-1EV_FORK_ENABLE\s0, \s-1EV_SIGNAL_ENABLE\s0, \s-1EV_ASYNC_ENABLE\s0, \s-1EV_CHILD_ENABLE\s0." 4 |
4818 | .IP "\s-1EV_PERIODIC_ENABLE, EV_IDLE_ENABLE, EV_EMBED_ENABLE, EV_STAT_ENABLE, EV_PREPARE_ENABLE, EV_CHECK_ENABLE, EV_FORK_ENABLE, EV_SIGNAL_ENABLE, EV_ASYNC_ENABLE, EV_CHILD_ENABLE.\s0" 4 |
4803 | .IX Item "EV_PERIODIC_ENABLE, EV_IDLE_ENABLE, EV_EMBED_ENABLE, EV_STAT_ENABLE, EV_PREPARE_ENABLE, EV_CHECK_ENABLE, EV_FORK_ENABLE, EV_SIGNAL_ENABLE, EV_ASYNC_ENABLE, EV_CHILD_ENABLE." |
4819 | .IX Item "EV_PERIODIC_ENABLE, EV_IDLE_ENABLE, EV_EMBED_ENABLE, EV_STAT_ENABLE, EV_PREPARE_ENABLE, EV_CHECK_ENABLE, EV_FORK_ENABLE, EV_SIGNAL_ENABLE, EV_ASYNC_ENABLE, EV_CHILD_ENABLE." |
4804 | If undefined or defined to be \f(CW1\fR (and the platform supports it), then |
4820 | If undefined or defined to be \f(CW1\fR (and the platform supports it), then |
4805 | the respective watcher type is supported. If defined to be \f(CW0\fR, then it |
4821 | the respective watcher type is supported. If defined to be \f(CW0\fR, then it |
4806 | is not. Disabling watcher types mainly saves code size. |
4822 | is not. Disabling watcher types mainly saves code size. |
4807 | .IP "\s-1EV_FEATURES\s0" 4 |
4823 | .IP "\s-1EV_FEATURES\s0" 4 |
… | |
… | |
4981 | .Vb 3 |
4997 | .Vb 3 |
4982 | \& #define EV_COMMON \e |
4998 | \& #define EV_COMMON \e |
4983 | \& SV *self; /* contains this struct */ \e |
4999 | \& SV *self; /* contains this struct */ \e |
4984 | \& SV *cb_sv, *fh /* note no trailing ";" */ |
5000 | \& SV *cb_sv, *fh /* note no trailing ";" */ |
4985 | .Ve |
5001 | .Ve |
4986 | .IP "\s-1EV_CB_DECLARE\s0 (type)" 4 |
5002 | .IP "\s-1EV_CB_DECLARE \s0(type)" 4 |
4987 | .IX Item "EV_CB_DECLARE (type)" |
5003 | .IX Item "EV_CB_DECLARE (type)" |
4988 | .PD 0 |
5004 | .PD 0 |
4989 | .IP "\s-1EV_CB_INVOKE\s0 (watcher, revents)" 4 |
5005 | .IP "\s-1EV_CB_INVOKE \s0(watcher, revents)" 4 |
4990 | .IX Item "EV_CB_INVOKE (watcher, revents)" |
5006 | .IX Item "EV_CB_INVOKE (watcher, revents)" |
4991 | .IP "ev_set_cb (ev, cb)" 4 |
5007 | .IP "ev_set_cb (ev, cb)" 4 |
4992 | .IX Item "ev_set_cb (ev, cb)" |
5008 | .IX Item "ev_set_cb (ev, cb)" |
4993 | .PD |
5009 | .PD |
4994 | Can be used to change the callback member declaration in each watcher, |
5010 | Can be used to change the callback member declaration in each watcher, |
4995 | and the way callbacks are invoked and set. Must expand to a struct member |
5011 | and the way callbacks are invoked and set. Must expand to a struct member |
4996 | definition and a statement, respectively. See the \fIev.h\fR header file for |
5012 | definition and a statement, respectively. See the \fIev.h\fR header file for |
4997 | their default definitions. One possible use for overriding these is to |
5013 | their default definitions. One possible use for overriding these is to |
4998 | avoid the \f(CW\*(C`struct ev_loop *\*(C'\fR as first argument in all cases, or to use |
5014 | avoid the \f(CW\*(C`struct ev_loop *\*(C'\fR as first argument in all cases, or to use |
4999 | method calls instead of plain function calls in \*(C+. |
5015 | method calls instead of plain function calls in \*(C+. |
5000 | .SS "\s-1EXPORTED\s0 \s-1API\s0 \s-1SYMBOLS\s0" |
5016 | .SS "\s-1EXPORTED API SYMBOLS\s0" |
5001 | .IX Subsection "EXPORTED API SYMBOLS" |
5017 | .IX Subsection "EXPORTED API SYMBOLS" |
5002 | If you need to re-export the \s-1API\s0 (e.g. via a \s-1DLL\s0) and you need a list of |
5018 | If you need to re-export the \s-1API \s0(e.g. via a \s-1DLL\s0) and you need a list of |
5003 | exported symbols, you can use the provided \fISymbol.*\fR files which list |
5019 | exported symbols, you can use the provided \fISymbol.*\fR files which list |
5004 | all public symbols, one per line: |
5020 | all public symbols, one per line: |
5005 | .PP |
5021 | .PP |
5006 | .Vb 2 |
5022 | .Vb 2 |
5007 | \& Symbols.ev for libev proper |
5023 | \& Symbols.ev for libev proper |
… | |
… | |
5059 | \& #include "ev_cpp.h" |
5075 | \& #include "ev_cpp.h" |
5060 | \& #include "ev.c" |
5076 | \& #include "ev.c" |
5061 | .Ve |
5077 | .Ve |
5062 | .SH "INTERACTION WITH OTHER PROGRAMS, LIBRARIES OR THE ENVIRONMENT" |
5078 | .SH "INTERACTION WITH OTHER PROGRAMS, LIBRARIES OR THE ENVIRONMENT" |
5063 | .IX Header "INTERACTION WITH OTHER PROGRAMS, LIBRARIES OR THE ENVIRONMENT" |
5079 | .IX Header "INTERACTION WITH OTHER PROGRAMS, LIBRARIES OR THE ENVIRONMENT" |
5064 | .SS "\s-1THREADS\s0 \s-1AND\s0 \s-1COROUTINES\s0" |
5080 | .SS "\s-1THREADS AND COROUTINES\s0" |
5065 | .IX Subsection "THREADS AND COROUTINES" |
5081 | .IX Subsection "THREADS AND COROUTINES" |
5066 | \fI\s-1THREADS\s0\fR |
5082 | \fI\s-1THREADS\s0\fR |
5067 | .IX Subsection "THREADS" |
5083 | .IX Subsection "THREADS" |
5068 | .PP |
5084 | .PP |
5069 | All libev functions are reentrant and thread-safe unless explicitly |
5085 | All libev functions are reentrant and thread-safe unless explicitly |
… | |
… | |
5115 | An example use would be to communicate signals or other events that only |
5131 | An example use would be to communicate signals or other events that only |
5116 | work in the default loop by registering the signal watcher with the |
5132 | work in the default loop by registering the signal watcher with the |
5117 | default loop and triggering an \f(CW\*(C`ev_async\*(C'\fR watcher from the default loop |
5133 | default loop and triggering an \f(CW\*(C`ev_async\*(C'\fR watcher from the default loop |
5118 | watcher callback into the event loop interested in the signal. |
5134 | watcher callback into the event loop interested in the signal. |
5119 | .PP |
5135 | .PP |
5120 | See also \*(L"\s-1THREAD\s0 \s-1LOCKING\s0 \s-1EXAMPLE\s0\*(R". |
5136 | See also \*(L"\s-1THREAD LOCKING EXAMPLE\*(R"\s0. |
5121 | .PP |
5137 | .PP |
5122 | \fI\s-1COROUTINES\s0\fR |
5138 | \fI\s-1COROUTINES\s0\fR |
5123 | .IX Subsection "COROUTINES" |
5139 | .IX Subsection "COROUTINES" |
5124 | .PP |
5140 | .PP |
5125 | Libev is very accommodating to coroutines (\*(L"cooperative threads\*(R"): |
5141 | Libev is very accommodating to coroutines (\*(L"cooperative threads\*(R"): |
… | |
… | |
5130 | that you must not do this from \f(CW\*(C`ev_periodic\*(C'\fR reschedule callbacks. |
5146 | that you must not do this from \f(CW\*(C`ev_periodic\*(C'\fR reschedule callbacks. |
5131 | .PP |
5147 | .PP |
5132 | Care has been taken to ensure that libev does not keep local state inside |
5148 | Care has been taken to ensure that libev does not keep local state inside |
5133 | \&\f(CW\*(C`ev_run\*(C'\fR, and other calls do not usually allow for coroutine switches as |
5149 | \&\f(CW\*(C`ev_run\*(C'\fR, and other calls do not usually allow for coroutine switches as |
5134 | they do not call any callbacks. |
5150 | they do not call any callbacks. |
5135 | .SS "\s-1COMPILER\s0 \s-1WARNINGS\s0" |
5151 | .SS "\s-1COMPILER WARNINGS\s0" |
5136 | .IX Subsection "COMPILER WARNINGS" |
5152 | .IX Subsection "COMPILER WARNINGS" |
5137 | Depending on your compiler and compiler settings, you might get no or a |
5153 | Depending on your compiler and compiler settings, you might get no or a |
5138 | lot of warnings when compiling libev code. Some people are apparently |
5154 | lot of warnings when compiling libev code. Some people are apparently |
5139 | scared by this. |
5155 | scared by this. |
5140 | .PP |
5156 | .PP |
… | |
… | |
5192 | .PP |
5208 | .PP |
5193 | If you need, for some reason, empty reports from valgrind for your project |
5209 | If you need, for some reason, empty reports from valgrind for your project |
5194 | I suggest using suppression lists. |
5210 | I suggest using suppression lists. |
5195 | .SH "PORTABILITY NOTES" |
5211 | .SH "PORTABILITY NOTES" |
5196 | .IX Header "PORTABILITY NOTES" |
5212 | .IX Header "PORTABILITY NOTES" |
5197 | .SS "\s-1GNU/LINUX\s0 32 \s-1BIT\s0 \s-1LIMITATIONS\s0" |
5213 | .SS "\s-1GNU/LINUX 32 BIT LIMITATIONS\s0" |
5198 | .IX Subsection "GNU/LINUX 32 BIT LIMITATIONS" |
5214 | .IX Subsection "GNU/LINUX 32 BIT LIMITATIONS" |
5199 | GNU/Linux is the only common platform that supports 64 bit file/large file |
5215 | GNU/Linux is the only common platform that supports 64 bit file/large file |
5200 | interfaces but \fIdisables\fR them by default. |
5216 | interfaces but \fIdisables\fR them by default. |
5201 | .PP |
5217 | .PP |
5202 | That means that libev compiled in the default environment doesn't support |
5218 | That means that libev compiled in the default environment doesn't support |
5203 | files larger than 2GiB or so, which mainly affects \f(CW\*(C`ev_stat\*(C'\fR watchers. |
5219 | files larger than 2GiB or so, which mainly affects \f(CW\*(C`ev_stat\*(C'\fR watchers. |
5204 | .PP |
5220 | .PP |
5205 | Unfortunately, many programs try to work around this GNU/Linux issue |
5221 | Unfortunately, many programs try to work around this GNU/Linux issue |
5206 | by enabling the large file \s-1API\s0, which makes them incompatible with the |
5222 | by enabling the large file \s-1API,\s0 which makes them incompatible with the |
5207 | standard libev compiled for their system. |
5223 | standard libev compiled for their system. |
5208 | .PP |
5224 | .PP |
5209 | Likewise, libev cannot enable the large file \s-1API\s0 itself as this would |
5225 | Likewise, libev cannot enable the large file \s-1API\s0 itself as this would |
5210 | suddenly make it incompatible to the default compile time environment, |
5226 | suddenly make it incompatible to the default compile time environment, |
5211 | i.e. all programs not using special compile switches. |
5227 | i.e. all programs not using special compile switches. |
5212 | .SS "\s-1OS/X\s0 \s-1AND\s0 \s-1DARWIN\s0 \s-1BUGS\s0" |
5228 | .SS "\s-1OS/X AND DARWIN BUGS\s0" |
5213 | .IX Subsection "OS/X AND DARWIN BUGS" |
5229 | .IX Subsection "OS/X AND DARWIN BUGS" |
5214 | The whole thing is a bug if you ask me \- basically any system interface |
5230 | The whole thing is a bug if you ask me \- basically any system interface |
5215 | you touch is broken, whether it is locales, poll, kqueue or even the |
5231 | you touch is broken, whether it is locales, poll, kqueue or even the |
5216 | OpenGL drivers. |
5232 | OpenGL drivers. |
5217 | .PP |
5233 | .PP |
… | |
… | |
5239 | .PP |
5255 | .PP |
5240 | \fI\f(CI\*(C`select\*(C'\fI is buggy\fR |
5256 | \fI\f(CI\*(C`select\*(C'\fI is buggy\fR |
5241 | .IX Subsection "select is buggy" |
5257 | .IX Subsection "select is buggy" |
5242 | .PP |
5258 | .PP |
5243 | All that's left is \f(CW\*(C`select\*(C'\fR, and of course Apple found a way to fuck this |
5259 | All that's left is \f(CW\*(C`select\*(C'\fR, and of course Apple found a way to fuck this |
5244 | one up as well: On \s-1OS/X\s0, \f(CW\*(C`select\*(C'\fR actively limits the number of file |
5260 | one up as well: On \s-1OS/X, \s0\f(CW\*(C`select\*(C'\fR actively limits the number of file |
5245 | descriptors you can pass in to 1024 \- your program suddenly crashes when |
5261 | descriptors you can pass in to 1024 \- your program suddenly crashes when |
5246 | you use more. |
5262 | you use more. |
5247 | .PP |
5263 | .PP |
5248 | There is an undocumented \*(L"workaround\*(R" for this \- defining |
5264 | There is an undocumented \*(L"workaround\*(R" for this \- defining |
5249 | \&\f(CW\*(C`_DARWIN_UNLIMITED_SELECT\*(C'\fR, which libev tries to use, so select \fIshould\fR |
5265 | \&\f(CW\*(C`_DARWIN_UNLIMITED_SELECT\*(C'\fR, which libev tries to use, so select \fIshould\fR |
5250 | work on \s-1OS/X\s0. |
5266 | work on \s-1OS/X.\s0 |
5251 | .SS "\s-1SOLARIS\s0 \s-1PROBLEMS\s0 \s-1AND\s0 \s-1WORKAROUNDS\s0" |
5267 | .SS "\s-1SOLARIS PROBLEMS AND WORKAROUNDS\s0" |
5252 | .IX Subsection "SOLARIS PROBLEMS AND WORKAROUNDS" |
5268 | .IX Subsection "SOLARIS PROBLEMS AND WORKAROUNDS" |
5253 | \fI\f(CI\*(C`errno\*(C'\fI reentrancy\fR |
5269 | \fI\f(CI\*(C`errno\*(C'\fI reentrancy\fR |
5254 | .IX Subsection "errno reentrancy" |
5270 | .IX Subsection "errno reentrancy" |
5255 | .PP |
5271 | .PP |
5256 | The default compile environment on Solaris is unfortunately so |
5272 | The default compile environment on Solaris is unfortunately so |
… | |
… | |
5273 | great. |
5289 | great. |
5274 | .PP |
5290 | .PP |
5275 | If you can't get it to work, you can try running the program by setting |
5291 | If you can't get it to work, you can try running the program by setting |
5276 | the environment variable \f(CW\*(C`LIBEV_FLAGS=3\*(C'\fR to only allow \f(CW\*(C`poll\*(C'\fR and |
5292 | the environment variable \f(CW\*(C`LIBEV_FLAGS=3\*(C'\fR to only allow \f(CW\*(C`poll\*(C'\fR and |
5277 | \&\f(CW\*(C`select\*(C'\fR backends. |
5293 | \&\f(CW\*(C`select\*(C'\fR backends. |
5278 | .SS "\s-1AIX\s0 \s-1POLL\s0 \s-1BUG\s0" |
5294 | .SS "\s-1AIX POLL BUG\s0" |
5279 | .IX Subsection "AIX POLL BUG" |
5295 | .IX Subsection "AIX POLL BUG" |
5280 | \&\s-1AIX\s0 unfortunately has a broken \f(CW\*(C`poll.h\*(C'\fR header. Libev works around |
5296 | \&\s-1AIX\s0 unfortunately has a broken \f(CW\*(C`poll.h\*(C'\fR header. Libev works around |
5281 | this by trying to avoid the poll backend altogether (i.e. it's not even |
5297 | this by trying to avoid the poll backend altogether (i.e. it's not even |
5282 | compiled in), which normally isn't a big problem as \f(CW\*(C`select\*(C'\fR works fine |
5298 | compiled in), which normally isn't a big problem as \f(CW\*(C`select\*(C'\fR works fine |
5283 | with large bitsets on \s-1AIX\s0, and \s-1AIX\s0 is dead anyway. |
5299 | with large bitsets on \s-1AIX,\s0 and \s-1AIX\s0 is dead anyway. |
5284 | .SS "\s-1WIN32\s0 \s-1PLATFORM\s0 \s-1LIMITATIONS\s0 \s-1AND\s0 \s-1WORKAROUNDS\s0" |
5300 | .SS "\s-1WIN32 PLATFORM LIMITATIONS AND WORKAROUNDS\s0" |
5285 | .IX Subsection "WIN32 PLATFORM LIMITATIONS AND WORKAROUNDS" |
5301 | .IX Subsection "WIN32 PLATFORM LIMITATIONS AND WORKAROUNDS" |
5286 | \fIGeneral issues\fR |
5302 | \fIGeneral issues\fR |
5287 | .IX Subsection "General issues" |
5303 | .IX Subsection "General issues" |
5288 | .PP |
5304 | .PP |
5289 | Win32 doesn't support any of the standards (e.g. \s-1POSIX\s0) that libev |
5305 | Win32 doesn't support any of the standards (e.g. \s-1POSIX\s0) that libev |
… | |
… | |
5358 | \& #define EV_USE_SELECT 1 |
5374 | \& #define EV_USE_SELECT 1 |
5359 | \& #define EV_SELECT_IS_WINSOCKET 1 /* forces EV_SELECT_USE_FD_SET, too */ |
5375 | \& #define EV_SELECT_IS_WINSOCKET 1 /* forces EV_SELECT_USE_FD_SET, too */ |
5360 | .Ve |
5376 | .Ve |
5361 | .PP |
5377 | .PP |
5362 | Note that winsockets handling of fd sets is O(n), so you can easily get a |
5378 | Note that winsockets handling of fd sets is O(n), so you can easily get a |
5363 | complexity in the O(nA\*^X) range when using win32. |
5379 | complexity in the O(nX) range when using win32. |
5364 | .PP |
5380 | .PP |
5365 | \fILimited number of file descriptors\fR |
5381 | \fILimited number of file descriptors\fR |
5366 | .IX Subsection "Limited number of file descriptors" |
5382 | .IX Subsection "Limited number of file descriptors" |
5367 | .PP |
5383 | .PP |
5368 | Windows has numerous arbitrary (and low) limits on things. |
5384 | Windows has numerous arbitrary (and low) limits on things. |
… | |
… | |
5384 | by calling \f(CW\*(C`_setmaxstdio\*(C'\fR, which can increase this limit to \f(CW2048\fR |
5400 | by calling \f(CW\*(C`_setmaxstdio\*(C'\fR, which can increase this limit to \f(CW2048\fR |
5385 | (another arbitrary limit), but is broken in many versions of the Microsoft |
5401 | (another arbitrary limit), but is broken in many versions of the Microsoft |
5386 | runtime libraries. This might get you to about \f(CW512\fR or \f(CW2048\fR sockets |
5402 | runtime libraries. This might get you to about \f(CW512\fR or \f(CW2048\fR sockets |
5387 | (depending on windows version and/or the phase of the moon). To get more, |
5403 | (depending on windows version and/or the phase of the moon). To get more, |
5388 | you need to wrap all I/O functions and provide your own fd management, but |
5404 | you need to wrap all I/O functions and provide your own fd management, but |
5389 | the cost of calling select (O(nA\*^X)) will likely make this unworkable. |
5405 | the cost of calling select (O(nX)) will likely make this unworkable. |
5390 | .SS "\s-1PORTABILITY\s0 \s-1REQUIREMENTS\s0" |
5406 | .SS "\s-1PORTABILITY REQUIREMENTS\s0" |
5391 | .IX Subsection "PORTABILITY REQUIREMENTS" |
5407 | .IX Subsection "PORTABILITY REQUIREMENTS" |
5392 | In addition to a working ISO-C implementation and of course the |
5408 | In addition to a working ISO-C implementation and of course the |
5393 | backend-specific APIs, libev relies on a few additional extensions: |
5409 | backend-specific APIs, libev relies on a few additional extensions: |
5394 | .ie n .IP """void (*)(ev_watcher_type *, int revents)"" must have compatible calling conventions regardless of ""ev_watcher_type *""." 4 |
5410 | .ie n .IP """void (*)(ev_watcher_type *, int revents)"" must have compatible calling conventions regardless of ""ev_watcher_type *""." 4 |
5395 | .el .IP "\f(CWvoid (*)(ev_watcher_type *, int revents)\fR must have compatible calling conventions regardless of \f(CWev_watcher_type *\fR." 4 |
5411 | .el .IP "\f(CWvoid (*)(ev_watcher_type *, int revents)\fR must have compatible calling conventions regardless of \f(CWev_watcher_type *\fR." 4 |
5396 | .IX Item "void (*)(ev_watcher_type *, int revents) must have compatible calling conventions regardless of ev_watcher_type *." |
5412 | .IX Item "void (*)(ev_watcher_type *, int revents) must have compatible calling conventions regardless of ev_watcher_type *." |
5397 | Libev assumes not only that all watcher pointers have the same internal |
5413 | Libev assumes not only that all watcher pointers have the same internal |
5398 | structure (guaranteed by \s-1POSIX\s0 but not by \s-1ISO\s0 C for example), but it also |
5414 | structure (guaranteed by \s-1POSIX\s0 but not by \s-1ISO C\s0 for example), but it also |
5399 | assumes that the same (machine) code can be used to call any watcher |
5415 | assumes that the same (machine) code can be used to call any watcher |
5400 | callback: The watcher callbacks have different type signatures, but libev |
5416 | callback: The watcher callbacks have different type signatures, but libev |
5401 | calls them using an \f(CW\*(C`ev_watcher *\*(C'\fR internally. |
5417 | calls them using an \f(CW\*(C`ev_watcher *\*(C'\fR internally. |
|
|
5418 | .IP "null pointers and integer zero are represented by 0 bytes" 4 |
|
|
5419 | .IX Item "null pointers and integer zero are represented by 0 bytes" |
|
|
5420 | Libev uses \f(CW\*(C`memset\*(C'\fR to initialise structs and arrays to \f(CW0\fR bytes, and |
|
|
5421 | relies on this setting pointers and integers to null. |
5402 | .IP "pointer accesses must be thread-atomic" 4 |
5422 | .IP "pointer accesses must be thread-atomic" 4 |
5403 | .IX Item "pointer accesses must be thread-atomic" |
5423 | .IX Item "pointer accesses must be thread-atomic" |
5404 | Accessing a pointer value must be atomic, it must both be readable and |
5424 | Accessing a pointer value must be atomic, it must both be readable and |
5405 | writable in one piece \- this is the case on all current architectures. |
5425 | writable in one piece \- this is the case on all current architectures. |
5406 | .ie n .IP """sig_atomic_t volatile"" must be thread-atomic as well" 4 |
5426 | .ie n .IP """sig_atomic_t volatile"" must be thread-atomic as well" 4 |
… | |
… | |
5424 | except the initial one, and run the signal handling loop in the initial |
5444 | except the initial one, and run the signal handling loop in the initial |
5425 | thread as well. |
5445 | thread as well. |
5426 | .ie n .IP """long"" must be large enough for common memory allocation sizes" 4 |
5446 | .ie n .IP """long"" must be large enough for common memory allocation sizes" 4 |
5427 | .el .IP "\f(CWlong\fR must be large enough for common memory allocation sizes" 4 |
5447 | .el .IP "\f(CWlong\fR must be large enough for common memory allocation sizes" 4 |
5428 | .IX Item "long must be large enough for common memory allocation sizes" |
5448 | .IX Item "long must be large enough for common memory allocation sizes" |
5429 | To improve portability and simplify its \s-1API\s0, libev uses \f(CW\*(C`long\*(C'\fR internally |
5449 | To improve portability and simplify its \s-1API,\s0 libev uses \f(CW\*(C`long\*(C'\fR internally |
5430 | instead of \f(CW\*(C`size_t\*(C'\fR when allocating its data structures. On non-POSIX |
5450 | instead of \f(CW\*(C`size_t\*(C'\fR when allocating its data structures. On non-POSIX |
5431 | systems (Microsoft...) this might be unexpectedly low, but is still at |
5451 | systems (Microsoft...) this might be unexpectedly low, but is still at |
5432 | least 31 bits everywhere, which is enough for hundreds of millions of |
5452 | least 31 bits everywhere, which is enough for hundreds of millions of |
5433 | watchers. |
5453 | watchers. |
5434 | .ie n .IP """double"" must hold a time value in seconds with enough accuracy" 4 |
5454 | .ie n .IP """double"" must hold a time value in seconds with enough accuracy" 4 |
… | |
… | |
5436 | .IX Item "double must hold a time value in seconds with enough accuracy" |
5456 | .IX Item "double must hold a time value in seconds with enough accuracy" |
5437 | The type \f(CW\*(C`double\*(C'\fR is used to represent timestamps. It is required to |
5457 | The type \f(CW\*(C`double\*(C'\fR is used to represent timestamps. It is required to |
5438 | have at least 51 bits of mantissa (and 9 bits of exponent), which is |
5458 | have at least 51 bits of mantissa (and 9 bits of exponent), which is |
5439 | good enough for at least into the year 4000 with millisecond accuracy |
5459 | good enough for at least into the year 4000 with millisecond accuracy |
5440 | (the design goal for libev). This requirement is overfulfilled by |
5460 | (the design goal for libev). This requirement is overfulfilled by |
5441 | implementations using \s-1IEEE\s0 754, which is basically all existing ones. |
5461 | implementations using \s-1IEEE 754,\s0 which is basically all existing ones. |
5442 | .Sp |
5462 | .Sp |
5443 | With \s-1IEEE\s0 754 doubles, you get microsecond accuracy until at least the |
5463 | With \s-1IEEE 754\s0 doubles, you get microsecond accuracy until at least the |
5444 | year 2255 (and millisecond accuracy till the year 287396 \- by then, libev |
5464 | year 2255 (and millisecond accuracy till the year 287396 \- by then, libev |
5445 | is either obsolete or somebody patched it to use \f(CW\*(C`long double\*(C'\fR or |
5465 | is either obsolete or somebody patched it to use \f(CW\*(C`long double\*(C'\fR or |
5446 | something like that, just kidding). |
5466 | something like that, just kidding). |
5447 | .PP |
5467 | .PP |
5448 | If you know of other additional requirements drop me a note. |
5468 | If you know of other additional requirements drop me a note. |
… | |
… | |
5510 | calls in the current loop iteration and the loop is currently |
5530 | calls in the current loop iteration and the loop is currently |
5511 | blocked. Checking for async and signal events involves iterating over all |
5531 | blocked. Checking for async and signal events involves iterating over all |
5512 | running async watchers or all signal numbers. |
5532 | running async watchers or all signal numbers. |
5513 | .SH "PORTING FROM LIBEV 3.X TO 4.X" |
5533 | .SH "PORTING FROM LIBEV 3.X TO 4.X" |
5514 | .IX Header "PORTING FROM LIBEV 3.X TO 4.X" |
5534 | .IX Header "PORTING FROM LIBEV 3.X TO 4.X" |
5515 | The major version 4 introduced some incompatible changes to the \s-1API\s0. |
5535 | The major version 4 introduced some incompatible changes to the \s-1API.\s0 |
5516 | .PP |
5536 | .PP |
5517 | At the moment, the \f(CW\*(C`ev.h\*(C'\fR header file provides compatibility definitions |
5537 | At the moment, the \f(CW\*(C`ev.h\*(C'\fR header file provides compatibility definitions |
5518 | for all changes, so most programs should still compile. The compatibility |
5538 | for all changes, so most programs should still compile. The compatibility |
5519 | layer might be removed in later versions of libev, so better update to the |
5539 | layer might be removed in later versions of libev, so better update to the |
5520 | new \s-1API\s0 early than late. |
5540 | new \s-1API\s0 early than late. |
5521 | .ie n .IP """EV_COMPAT3"" backwards compatibility mechanism" 4 |
5541 | .ie n .IP """EV_COMPAT3"" backwards compatibility mechanism" 4 |
5522 | .el .IP "\f(CWEV_COMPAT3\fR backwards compatibility mechanism" 4 |
5542 | .el .IP "\f(CWEV_COMPAT3\fR backwards compatibility mechanism" 4 |
5523 | .IX Item "EV_COMPAT3 backwards compatibility mechanism" |
5543 | .IX Item "EV_COMPAT3 backwards compatibility mechanism" |
5524 | The backward compatibility mechanism can be controlled by |
5544 | The backward compatibility mechanism can be controlled by |
5525 | \&\f(CW\*(C`EV_COMPAT3\*(C'\fR. See \*(L"\s-1PREPROCESSOR\s0 \s-1SYMBOLS/MACROS\s0\*(R" in the \*(L"\s-1EMBEDDING\s0\*(R" |
5545 | \&\f(CW\*(C`EV_COMPAT3\*(C'\fR. See \*(L"\s-1PREPROCESSOR SYMBOLS/MACROS\*(R"\s0 in the \*(L"\s-1EMBEDDING\*(R"\s0 |
5526 | section. |
5546 | section. |
5527 | .ie n .IP """ev_default_destroy"" and ""ev_default_fork"" have been removed" 4 |
5547 | .ie n .IP """ev_default_destroy"" and ""ev_default_fork"" have been removed" 4 |
5528 | .el .IP "\f(CWev_default_destroy\fR and \f(CWev_default_fork\fR have been removed" 4 |
5548 | .el .IP "\f(CWev_default_destroy\fR and \f(CWev_default_fork\fR have been removed" 4 |
5529 | .IX Item "ev_default_destroy and ev_default_fork have been removed" |
5549 | .IX Item "ev_default_destroy and ev_default_fork have been removed" |
5530 | These calls can be replaced easily by their \f(CW\*(C`ev_loop_xxx\*(C'\fR counterparts: |
5550 | These calls can be replaced easily by their \f(CW\*(C`ev_loop_xxx\*(C'\fR counterparts: |
… | |
… | |
5570 | .SH "GLOSSARY" |
5590 | .SH "GLOSSARY" |
5571 | .IX Header "GLOSSARY" |
5591 | .IX Header "GLOSSARY" |
5572 | .IP "active" 4 |
5592 | .IP "active" 4 |
5573 | .IX Item "active" |
5593 | .IX Item "active" |
5574 | A watcher is active as long as it has been started and not yet stopped. |
5594 | A watcher is active as long as it has been started and not yet stopped. |
5575 | See \*(L"\s-1WATCHER\s0 \s-1STATES\s0\*(R" for details. |
5595 | See \*(L"\s-1WATCHER STATES\*(R"\s0 for details. |
5576 | .IP "application" 4 |
5596 | .IP "application" 4 |
5577 | .IX Item "application" |
5597 | .IX Item "application" |
5578 | In this document, an application is whatever is using libev. |
5598 | In this document, an application is whatever is using libev. |
5579 | .IP "backend" 4 |
5599 | .IP "backend" 4 |
5580 | .IX Item "backend" |
5600 | .IX Item "backend" |
… | |
… | |
5607 | The model used to describe how an event loop handles and processes |
5627 | The model used to describe how an event loop handles and processes |
5608 | watchers and events. |
5628 | watchers and events. |
5609 | .IP "pending" 4 |
5629 | .IP "pending" 4 |
5610 | .IX Item "pending" |
5630 | .IX Item "pending" |
5611 | A watcher is pending as soon as the corresponding event has been |
5631 | A watcher is pending as soon as the corresponding event has been |
5612 | detected. See \*(L"\s-1WATCHER\s0 \s-1STATES\s0\*(R" for details. |
5632 | detected. See \*(L"\s-1WATCHER STATES\*(R"\s0 for details. |
5613 | .IP "real time" 4 |
5633 | .IP "real time" 4 |
5614 | .IX Item "real time" |
5634 | .IX Item "real time" |
5615 | The physical time that is observed. It is apparently strictly monotonic :) |
5635 | The physical time that is observed. It is apparently strictly monotonic :) |
5616 | .IP "wall-clock time" 4 |
5636 | .IP "wall-clock time" 4 |
5617 | .IX Item "wall-clock time" |
5637 | .IX Item "wall-clock time" |