… | |
… | |
704 | event loop time (see C<ev_now_update>). |
704 | event loop time (see C<ev_now_update>). |
705 | |
705 | |
706 | =item ev_loop (loop, int flags) |
706 | =item ev_loop (loop, int flags) |
707 | |
707 | |
708 | Finally, this is it, the event handler. This function usually is called |
708 | Finally, this is it, the event handler. This function usually is called |
709 | after you initialised all your watchers and you want to start handling |
709 | after you have initialised all your watchers and you want to start |
710 | events. |
710 | handling events. |
711 | |
711 | |
712 | If the flags argument is specified as C<0>, it will not return until |
712 | If the flags argument is specified as C<0>, it will not return until |
713 | either no event watchers are active anymore or C<ev_unloop> was called. |
713 | either no event watchers are active anymore or C<ev_unloop> was called. |
714 | |
714 | |
715 | Please note that an explicit C<ev_unloop> is usually better than |
715 | Please note that an explicit C<ev_unloop> is usually better than |
… | |
… | |
2108 | |
2108 | |
2109 | When the first watcher gets started will libev actually register something |
2109 | When the first watcher gets started will libev actually register something |
2110 | with the kernel (thus it coexists with your own signal handlers as long as |
2110 | with the kernel (thus it coexists with your own signal handlers as long as |
2111 | you don't register any with libev for the same signal). |
2111 | you don't register any with libev for the same signal). |
2112 | |
2112 | |
2113 | Both the signal mask state (C<sigprocmask>) and the signal handler state |
|
|
2114 | (C<sigaction>) are unspecified after starting a signal watcher (and after |
|
|
2115 | sotpping it again), that is, libev might or might not block the signal, |
|
|
2116 | and might or might not set or restore the installed signal handler. |
|
|
2117 | |
|
|
2118 | If possible and supported, libev will install its handlers with |
2113 | If possible and supported, libev will install its handlers with |
2119 | C<SA_RESTART> (or equivalent) behaviour enabled, so system calls should |
2114 | C<SA_RESTART> (or equivalent) behaviour enabled, so system calls should |
2120 | not be unduly interrupted. If you have a problem with system calls getting |
2115 | not be unduly interrupted. If you have a problem with system calls getting |
2121 | interrupted by signals you can block all signals in an C<ev_check> watcher |
2116 | interrupted by signals you can block all signals in an C<ev_check> watcher |
2122 | and unblock them in an C<ev_prepare> watcher. |
2117 | and unblock them in an C<ev_prepare> watcher. |
|
|
2118 | |
|
|
2119 | =head3 The special problem of inheritance over execve |
|
|
2120 | |
|
|
2121 | Both the signal mask (C<sigprocmask>) and the signal disposition |
|
|
2122 | (C<sigaction>) are unspecified after starting a signal watcher (and after |
|
|
2123 | stopping it again), that is, libev might or might not block the signal, |
|
|
2124 | and might or might not set or restore the installed signal handler. |
|
|
2125 | |
|
|
2126 | While this does not matter for the signal disposition (libev never |
|
|
2127 | sets signals to C<SIG_IGN>, so handlers will be reset to C<SIG_DFL> on |
|
|
2128 | C<execve>), this matters for the signal mask: many programs do not expect |
|
|
2129 | certain signals to be blocked. |
|
|
2130 | |
|
|
2131 | This means that before calling C<exec> (from the child) you should reset |
|
|
2132 | the signal mask to whatever "default" you expect (all clear is a good |
|
|
2133 | choice usually). |
|
|
2134 | |
|
|
2135 | The simplest way to ensure that the signal mask is reset in the child is |
|
|
2136 | to install a fork handler with C<pthread_atfork> that resets it. That will |
|
|
2137 | catch fork calls done by libraries (such as the libc) as well. |
|
|
2138 | |
|
|
2139 | In current versions of libev, you can also ensure that the signal mask is |
|
|
2140 | not blocking any signals (except temporarily, so thread users watch out) |
|
|
2141 | by specifying the C<EVFLAG_NOSIGNALFD> when creating the event loop. This |
|
|
2142 | is not guaranteed for future versions, however. |
2123 | |
2143 | |
2124 | =head3 Watcher-Specific Functions and Data Members |
2144 | =head3 Watcher-Specific Functions and Data Members |
2125 | |
2145 | |
2126 | =over 4 |
2146 | =over 4 |
2127 | |
2147 | |
… | |
… | |
3407 | =item Ocaml |
3427 | =item Ocaml |
3408 | |
3428 | |
3409 | Erkki Seppala has written Ocaml bindings for libev, to be found at |
3429 | Erkki Seppala has written Ocaml bindings for libev, to be found at |
3410 | L<http://modeemi.cs.tut.fi/~flux/software/ocaml-ev/>. |
3430 | L<http://modeemi.cs.tut.fi/~flux/software/ocaml-ev/>. |
3411 | |
3431 | |
|
|
3432 | =item Lua |
|
|
3433 | |
|
|
3434 | Brian Maher has written a partial interface to libev |
|
|
3435 | for lua (only C<ev_io> and C<ev_timer>), to be found at |
|
|
3436 | L<http://github.com/brimworks/lua-ev>. |
|
|
3437 | |
3412 | =back |
3438 | =back |
3413 | |
3439 | |
3414 | |
3440 | |
3415 | =head1 MACRO MAGIC |
3441 | =head1 MACRO MAGIC |
3416 | |
3442 | |
… | |
… | |
3657 | be used is the winsock select). This means that it will call |
3683 | be used is the winsock select). This means that it will call |
3658 | C<_get_osfhandle> on the fd to convert it to an OS handle. Otherwise, |
3684 | C<_get_osfhandle> on the fd to convert it to an OS handle. Otherwise, |
3659 | it is assumed that all these functions actually work on fds, even |
3685 | it is assumed that all these functions actually work on fds, even |
3660 | on win32. Should not be defined on non-win32 platforms. |
3686 | on win32. Should not be defined on non-win32 platforms. |
3661 | |
3687 | |
3662 | =item EV_FD_TO_WIN32_HANDLE |
3688 | =item EV_FD_TO_WIN32_HANDLE(fd) |
3663 | |
3689 | |
3664 | If C<EV_SELECT_IS_WINSOCKET> is enabled, then libev needs a way to map |
3690 | If C<EV_SELECT_IS_WINSOCKET> is enabled, then libev needs a way to map |
3665 | file descriptors to socket handles. When not defining this symbol (the |
3691 | file descriptors to socket handles. When not defining this symbol (the |
3666 | default), then libev will call C<_get_osfhandle>, which is usually |
3692 | default), then libev will call C<_get_osfhandle>, which is usually |
3667 | correct. In some cases, programs use their own file descriptor management, |
3693 | correct. In some cases, programs use their own file descriptor management, |
3668 | in which case they can provide this function to map fds to socket handles. |
3694 | in which case they can provide this function to map fds to socket handles. |
|
|
3695 | |
|
|
3696 | =item EV_WIN32_HANDLE_TO_FD(handle) |
|
|
3697 | |
|
|
3698 | If C<EV_SELECT_IS_WINSOCKET> then libev maps handles to file descriptors |
|
|
3699 | using the standard C<_open_osfhandle> function. For programs implementing |
|
|
3700 | their own fd to handle mapping, overwriting this function makes it easier |
|
|
3701 | to do so. This can be done by defining this macro to an appropriate value. |
|
|
3702 | |
|
|
3703 | =item EV_WIN32_CLOSE_FD(fd) |
|
|
3704 | |
|
|
3705 | If programs implement their own fd to handle mapping on win32, then this |
|
|
3706 | macro can be used to override the C<close> function, useful to unregister |
|
|
3707 | file descriptors again. Note that the replacement function has to close |
|
|
3708 | the underlying OS handle. |
3669 | |
3709 | |
3670 | =item EV_USE_POLL |
3710 | =item EV_USE_POLL |
3671 | |
3711 | |
3672 | If defined to be C<1>, libev will compile in support for the C<poll>(2) |
3712 | If defined to be C<1>, libev will compile in support for the C<poll>(2) |
3673 | backend. Otherwise it will be enabled on non-win32 platforms. It |
3713 | backend. Otherwise it will be enabled on non-win32 platforms. It |