… | |
… | |
64 | |
64 | |
65 | EXAMPLE |
65 | EXAMPLE |
66 | This is a simple example that uses the EV module and loads /etc/passwd |
66 | This is a simple example that uses the EV module and loads /etc/passwd |
67 | asynchronously: |
67 | asynchronously: |
68 | |
68 | |
69 | use Fcntl; |
|
|
70 | use EV; |
69 | use EV; |
71 | use IO::AIO; |
70 | use IO::AIO; |
72 | |
71 | |
73 | # register the IO::AIO callback with EV |
72 | # register the IO::AIO callback with EV |
74 | my $aio_w = EV::io IO::AIO::poll_fileno, EV::READ, \&IO::AIO::poll_cb; |
73 | my $aio_w = EV::io IO::AIO::poll_fileno, EV::READ, \&IO::AIO::poll_cb; |
… | |
… | |
91 | |
90 | |
92 | # file contents now in $contents |
91 | # file contents now in $contents |
93 | print $contents; |
92 | print $contents; |
94 | |
93 | |
95 | # exit event loop and program |
94 | # exit event loop and program |
96 | EV::unloop; |
95 | EV::break; |
97 | }; |
96 | }; |
98 | }; |
97 | }; |
99 | |
98 | |
100 | # possibly queue up other requests, or open GUI windows, |
99 | # possibly queue up other requests, or open GUI windows, |
101 | # check for sockets etc. etc. |
100 | # check for sockets etc. etc. |
102 | |
101 | |
103 | # process events as long as there are some: |
102 | # process events as long as there are some: |
104 | EV::loop; |
103 | EV::run; |
105 | |
104 | |
106 | REQUEST ANATOMY AND LIFETIME |
105 | REQUEST ANATOMY AND LIFETIME |
107 | Every "aio_*" function creates a request. which is a C data structure |
106 | Every "aio_*" function creates a request. which is a C data structure |
108 | not directly visible to Perl. |
107 | not directly visible to Perl. |
109 | |
108 | |
… | |
… | |
172 | aio_unlink $pathname, $callback->($status) |
171 | aio_unlink $pathname, $callback->($status) |
173 | aio_mknod $pathname, $mode, $dev, $callback->($status) |
172 | aio_mknod $pathname, $mode, $dev, $callback->($status) |
174 | aio_link $srcpath, $dstpath, $callback->($status) |
173 | aio_link $srcpath, $dstpath, $callback->($status) |
175 | aio_symlink $srcpath, $dstpath, $callback->($status) |
174 | aio_symlink $srcpath, $dstpath, $callback->($status) |
176 | aio_readlink $pathname, $callback->($link) |
175 | aio_readlink $pathname, $callback->($link) |
177 | aio_realpath $pathname, $callback->($link) |
176 | aio_realpath $pathname, $callback->($path) |
178 | aio_rename $srcpath, $dstpath, $callback->($status) |
177 | aio_rename $srcpath, $dstpath, $callback->($status) |
179 | aio_mkdir $pathname, $mode, $callback->($status) |
178 | aio_mkdir $pathname, $mode, $callback->($status) |
180 | aio_rmdir $pathname, $callback->($status) |
179 | aio_rmdir $pathname, $callback->($status) |
181 | aio_readdir $pathname, $callback->($entries) |
180 | aio_readdir $pathname, $callback->($entries) |
182 | aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
181 | aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
… | |
… | |
331 | "O_APPEND"), the following POSIX and non-POSIX constants are |
330 | "O_APPEND"), the following POSIX and non-POSIX constants are |
332 | available (missing ones on your system are, as usual, 0): |
331 | available (missing ones on your system are, as usual, 0): |
333 | |
332 | |
334 | "O_ASYNC", "O_DIRECT", "O_NOATIME", "O_CLOEXEC", "O_NOCTTY", |
333 | "O_ASYNC", "O_DIRECT", "O_NOATIME", "O_CLOEXEC", "O_NOCTTY", |
335 | "O_NOFOLLOW", "O_NONBLOCK", "O_EXEC", "O_SEARCH", "O_DIRECTORY", |
334 | "O_NOFOLLOW", "O_NONBLOCK", "O_EXEC", "O_SEARCH", "O_DIRECTORY", |
336 | "O_DSYNC", "O_RSYNC", "O_SYNC" and "O_TTY_INIT". |
335 | "O_DSYNC", "O_RSYNC", "O_SYNC", "O_PATH", "O_TMPFILE", and |
|
|
336 | "O_TTY_INIT". |
337 | |
337 | |
338 | aio_close $fh, $callback->($status) |
338 | aio_close $fh, $callback->($status) |
339 | Asynchronously close a file and call the callback with the result |
339 | Asynchronously close a file and call the callback with the result |
340 | code. |
340 | code. |
341 | |
341 | |
… | |
… | |
530 | namemax => 255, |
530 | namemax => 255, |
531 | frsize => 1024, |
531 | frsize => 1024, |
532 | fsid => 1810 |
532 | fsid => 1810 |
533 | } |
533 | } |
534 | |
534 | |
535 | Here is a (likely partial) list of fsid values used by Linux - it is |
535 | Here is a (likely partial - send me updates!) list of fsid values |
536 | safe to hardcode these when the $^O is "linux": |
536 | used by Linux - it is safe to hardcode these when $^O is "linux": |
537 | |
537 | |
538 | 0x0000adf5 adfs |
538 | 0x0000adf5 adfs |
539 | 0x0000adff affs |
539 | 0x0000adff affs |
540 | 0x5346414f afs |
540 | 0x5346414f afs |
541 | 0x09041934 anon-inode filesystem |
541 | 0x09041934 anon-inode filesystem |
… | |
… | |
554 | 0x00001373 devfs |
554 | 0x00001373 devfs |
555 | 0x00001cd1 devpts |
555 | 0x00001cd1 devpts |
556 | 0x0000f15f ecryptfs |
556 | 0x0000f15f ecryptfs |
557 | 0x00414a53 efs |
557 | 0x00414a53 efs |
558 | 0x0000137d ext |
558 | 0x0000137d ext |
559 | 0x0000ef53 ext2/ext3 |
559 | 0x0000ef53 ext2/ext3/ext4 |
560 | 0x0000ef51 ext2 |
560 | 0x0000ef51 ext2 |
|
|
561 | 0xf2f52010 f2fs |
561 | 0x00004006 fat |
562 | 0x00004006 fat |
562 | 0x65735546 fuseblk |
563 | 0x65735546 fuseblk |
563 | 0x65735543 fusectl |
564 | 0x65735543 fusectl |
564 | 0x0bad1dea futexfs |
565 | 0x0bad1dea futexfs |
565 | 0x01161970 gfs2 |
566 | 0x01161970 gfs2 |
566 | 0x47504653 gpfs |
567 | 0x47504653 gpfs |
567 | 0x00004244 hfs |
568 | 0x00004244 hfs |
568 | 0xf995e849 hpfs |
569 | 0xf995e849 hpfs |
|
|
570 | 0x00c0ffee hostfs |
569 | 0x958458f6 hugetlbfs |
571 | 0x958458f6 hugetlbfs |
570 | 0x2bad1dea inotifyfs |
572 | 0x2bad1dea inotifyfs |
571 | 0x00009660 isofs |
573 | 0x00009660 isofs |
572 | 0x000072b6 jffs2 |
574 | 0x000072b6 jffs2 |
573 | 0x3153464a jfs |
575 | 0x3153464a jfs |
… | |
… | |
588 | 0x00009fa1 openprom |
590 | 0x00009fa1 openprom |
589 | 0x7461636F ocfs2 |
591 | 0x7461636F ocfs2 |
590 | 0x00009fa0 proc |
592 | 0x00009fa0 proc |
591 | 0x6165676c pstorefs |
593 | 0x6165676c pstorefs |
592 | 0x0000002f qnx4 |
594 | 0x0000002f qnx4 |
|
|
595 | 0x68191122 qnx6 |
593 | 0x858458f6 ramfs |
596 | 0x858458f6 ramfs |
594 | 0x52654973 reiserfs |
597 | 0x52654973 reiserfs |
595 | 0x00007275 romfs |
598 | 0x00007275 romfs |
596 | 0x67596969 rpc_pipefs |
599 | 0x67596969 rpc_pipefs |
597 | 0x73636673 securityfs |
600 | 0x73636673 securityfs |
… | |
… | |
644 | |
647 | |
645 | aio_truncate $fh_or_path, $offset, $callback->($status) |
648 | aio_truncate $fh_or_path, $offset, $callback->($status) |
646 | Works like truncate(2) or ftruncate(2). |
649 | Works like truncate(2) or ftruncate(2). |
647 | |
650 | |
648 | aio_allocate $fh, $mode, $offset, $len, $callback->($status) |
651 | aio_allocate $fh, $mode, $offset, $len, $callback->($status) |
649 | Allocates or freed disk space according to the $mode argument. See |
652 | Allocates or frees disk space according to the $mode argument. See |
650 | the linux "fallocate" docuemntation for details. |
653 | the linux "fallocate" documentation for details. |
651 | |
654 | |
652 | $mode can currently be 0 or "IO::AIO::FALLOC_FL_KEEP_SIZE" to |
655 | $mode is usually 0 or "IO::AIO::FALLOC_FL_KEEP_SIZE" to allocate |
653 | allocate space, or "IO::AIO::FALLOC_FL_PUNCH_HOLE | |
656 | space, or "IO::AIO::FALLOC_FL_PUNCH_HOLE | |
654 | IO::AIO::FALLOC_FL_KEEP_SIZE", to deallocate a file range. |
657 | IO::AIO::FALLOC_FL_KEEP_SIZE", to deallocate a file range. |
|
|
658 | |
|
|
659 | IO::AIO also supports "FALLOC_FL_COLLAPSE_RANGE", to remove a range |
|
|
660 | (without leaving a hole) and "FALLOC_FL_ZERO_RANGE", to zero a range |
|
|
661 | (see your fallocate(2) manpage). |
655 | |
662 | |
656 | The file system block size used by "fallocate" is presumably the |
663 | The file system block size used by "fallocate" is presumably the |
657 | "f_bsize" returned by "statvfs". |
664 | "f_bsize" returned by "statvfs". |
658 | |
665 | |
659 | If "fallocate" isn't available or cannot be emulated (currently no |
666 | If "fallocate" isn't available or cannot be emulated (currently no |
… | |
… | |
692 | the callback. If an error occurs, nothing or undef gets passed to |
699 | the callback. If an error occurs, nothing or undef gets passed to |
693 | the callback. |
700 | the callback. |
694 | |
701 | |
695 | aio_realpath $pathname, $callback->($path) |
702 | aio_realpath $pathname, $callback->($path) |
696 | Asynchronously make the path absolute and resolve any symlinks in |
703 | Asynchronously make the path absolute and resolve any symlinks in |
697 | $path. The resulting path only consists of directories (Same as |
704 | $path. The resulting path only consists of directories (same as |
698 | Cwd::realpath). |
705 | Cwd::realpath). |
699 | |
706 | |
700 | This request can be used to get the absolute path of the current |
707 | This request can be used to get the absolute path of the current |
701 | working directory by passing it a path of . (a single dot). |
708 | working directory by passing it a path of . (a single dot). |
702 | |
709 | |
703 | aio_rename $srcpath, $dstpath, $callback->($status) |
710 | aio_rename $srcpath, $dstpath, $callback->($status) |
704 | Asynchronously rename the object at $srcpath to $dstpath, just as |
711 | Asynchronously rename the object at $srcpath to $dstpath, just as |
705 | rename(2) and call the callback with the result code. |
712 | rename(2) and call the callback with the result code. |
|
|
713 | |
|
|
714 | On systems that support the AIO::WD working directory abstraction |
|
|
715 | natively, the case "[$wd, "."]" as $srcpath is specialcased - |
|
|
716 | instead of failing, "rename" is called on the absolute path of $wd. |
706 | |
717 | |
707 | aio_mkdir $pathname, $mode, $callback->($status) |
718 | aio_mkdir $pathname, $mode, $callback->($status) |
708 | Asynchronously mkdir (create) a directory and call the callback with |
719 | Asynchronously mkdir (create) a directory and call the callback with |
709 | the result code. $mode will be modified by the umask at the time the |
720 | the result code. $mode will be modified by the umask at the time the |
710 | request is executed, so do not change your umask. |
721 | request is executed, so do not change your umask. |
711 | |
722 | |
712 | aio_rmdir $pathname, $callback->($status) |
723 | aio_rmdir $pathname, $callback->($status) |
713 | Asynchronously rmdir (delete) a directory and call the callback with |
724 | Asynchronously rmdir (delete) a directory and call the callback with |
714 | the result code. |
725 | the result code. |
|
|
726 | |
|
|
727 | On systems that support the AIO::WD working directory abstraction |
|
|
728 | natively, the case "[$wd, "."]" is specialcased - instead of |
|
|
729 | failing, "rmdir" is called on the absolute path of $wd. |
715 | |
730 | |
716 | aio_readdir $pathname, $callback->($entries) |
731 | aio_readdir $pathname, $callback->($entries) |
717 | Unlike the POSIX call of the same name, "aio_readdir" reads an |
732 | Unlike the POSIX call of the same name, "aio_readdir" reads an |
718 | entire directory (i.e. opendir + readdir + closedir). The entries |
733 | entire directory (i.e. opendir + readdir + closedir). The entries |
719 | will not be sorted, and will NOT include the "." and ".." entries. |
734 | will not be sorted, and will NOT include the "." and ".." entries. |
… | |
… | |
942 | |
957 | |
943 | It touches (reads or writes) all memory pages in the specified range |
958 | It touches (reads or writes) all memory pages in the specified range |
944 | inside the scalar. All caveats and parameters are the same as for |
959 | inside the scalar. All caveats and parameters are the same as for |
945 | "aio_msync", above, except for flags, which must be either 0 (which |
960 | "aio_msync", above, except for flags, which must be either 0 (which |
946 | reads all pages and ensures they are instantiated) or |
961 | reads all pages and ensures they are instantiated) or |
947 | "IO::AIO::MT_MODIFY", which modifies the memory page s(by reading |
962 | "IO::AIO::MT_MODIFY", which modifies the memory pages (by reading |
948 | and writing an octet from it, which dirties the page). |
963 | and writing an octet from it, which dirties the page). |
949 | |
964 | |
950 | aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status) |
965 | aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status) |
951 | This is a rather advanced IO::AIO call, which works best on |
966 | This is a rather advanced IO::AIO call, which works best on |
952 | mmap(2)ed scalars. |
967 | mmap(2)ed scalars. |
… | |
… | |
1121 | aio_stat [$etcdir, "passwd"], sub { |
1136 | aio_stat [$etcdir, "passwd"], sub { |
1122 | # yay |
1137 | # yay |
1123 | }; |
1138 | }; |
1124 | }; |
1139 | }; |
1125 | |
1140 | |
1126 | That "aio_wd" is a request and not a normal function shows that creating |
1141 | The fact that "aio_wd" is a request and not a normal function shows that |
1127 | an IO::AIO::WD object is itself a potentially blocking operation, which |
1142 | creating an IO::AIO::WD object is itself a potentially blocking |
1128 | is why it is done asynchronously. |
1143 | operation, which is why it is done asynchronously. |
1129 | |
1144 | |
1130 | To stat the directory obtained with "aio_wd" above, one could write |
1145 | To stat the directory obtained with "aio_wd" above, one could write |
1131 | either of the following three request calls: |
1146 | either of the following three request calls: |
1132 | |
1147 | |
1133 | aio_lstat "/etc" , sub { ... # pathname as normal string |
1148 | aio_lstat "/etc" , sub { ... # pathname as normal string |
… | |
… | |
1153 | will still point to the original directory. Most functions accepting a |
1168 | will still point to the original directory. Most functions accepting a |
1154 | pathname will use the directory fd on newer systems, and the string on |
1169 | pathname will use the directory fd on newer systems, and the string on |
1155 | older systems. Some functions (such as realpath) will always rely on the |
1170 | older systems. Some functions (such as realpath) will always rely on the |
1156 | string form of the pathname. |
1171 | string form of the pathname. |
1157 | |
1172 | |
1158 | So this fucntionality is mainly useful to get some protection against |
1173 | So this functionality is mainly useful to get some protection against |
1159 | "chdir", to easily get an absolute path out of a relative path for |
1174 | "chdir", to easily get an absolute path out of a relative path for |
1160 | future reference, and to speed up doing many operations in the same |
1175 | future reference, and to speed up doing many operations in the same |
1161 | directory (e.g. when stat'ing all files in a directory). |
1176 | directory (e.g. when stat'ing all files in a directory). |
1162 | |
1177 | |
1163 | The following functions implement this working directory abstraction: |
1178 | The following functions implement this working directory abstraction: |
… | |
… | |
1173 | Since passing "undef" as working directory component of a pathname |
1188 | Since passing "undef" as working directory component of a pathname |
1174 | fails the request with "ENOENT", there is often no need for error |
1189 | fails the request with "ENOENT", there is often no need for error |
1175 | checking in the "aio_wd" callback, as future requests using the |
1190 | checking in the "aio_wd" callback, as future requests using the |
1176 | value will fail in the expected way. |
1191 | value will fail in the expected way. |
1177 | |
1192 | |
1178 | If this call isn't available because your OS lacks it or it couldn't |
|
|
1179 | be detected, it will be emulated by calling "fsync" instead. |
|
|
1180 | |
|
|
1181 | IO::AIO::CWD |
1193 | IO::AIO::CWD |
1182 | This is a compiletime constant (object) that represents the process |
1194 | This is a compiletime constant (object) that represents the process |
1183 | current working directory. |
1195 | current working directory. |
1184 | |
1196 | |
1185 | Specifying this object as working directory object for a pathname is |
1197 | Specifying this object as working directory object for a pathname is |
1186 | as if the pathname would be specified directly, without a directory |
1198 | as if the pathname would be specified directly, without a directory |
1187 | object, e.g., these calls are functionally identical: |
1199 | object. For example, these calls are functionally identical: |
1188 | |
1200 | |
1189 | aio_stat "somefile", sub { ... }; |
1201 | aio_stat "somefile", sub { ... }; |
1190 | aio_stat [IO::AIO::CWD, "somefile"], sub { ... }; |
1202 | aio_stat [IO::AIO::CWD, "somefile"], sub { ... }; |
|
|
1203 | |
|
|
1204 | To recover the path associated with an IO::AIO::WD object, you can use |
|
|
1205 | "aio_realpath": |
|
|
1206 | |
|
|
1207 | aio_realpath $wd, sub { |
|
|
1208 | warn "path is $_[0]\n"; |
|
|
1209 | }; |
|
|
1210 | |
|
|
1211 | Currently, "aio_statvfs" always, and "aio_rename" and "aio_rmdir" |
|
|
1212 | sometimes, fall back to using an absolue path. |
1191 | |
1213 | |
1192 | IO::AIO::REQ CLASS |
1214 | IO::AIO::REQ CLASS |
1193 | All non-aggregate "aio_*" functions return an object of this class when |
1215 | All non-aggregate "aio_*" functions return an object of this class when |
1194 | called in non-void context. |
1216 | called in non-void context. |
1195 | |
1217 | |
… | |
… | |
1347 | results. |
1369 | results. |
1348 | |
1370 | |
1349 | See "poll_cb" for an example. |
1371 | See "poll_cb" for an example. |
1350 | |
1372 | |
1351 | IO::AIO::poll_cb |
1373 | IO::AIO::poll_cb |
1352 | Process some outstanding events on the result pipe. You have to call |
1374 | Process some requests that have reached the result phase (i.e. they |
|
|
1375 | have been executed but the results are not yet reported). You have |
|
|
1376 | to call this "regularly" to finish outstanding requests. |
|
|
1377 | |
1353 | this regularly. Returns 0 if all events could be processed (or there |
1378 | Returns 0 if all events could be processed (or there were no events |
1354 | were no events to process), or -1 if it returned earlier for |
1379 | to process), or -1 if it returned earlier for whatever reason. |
1355 | whatever reason. Returns immediately when no events are outstanding. |
1380 | Returns immediately when no events are outstanding. The amount of |
1356 | The amount of events processed depends on the settings of |
1381 | events processed depends on the settings of "IO::AIO::max_poll_req", |
1357 | "IO::AIO::max_poll_req" and "IO::AIO::max_poll_time". |
1382 | "IO::AIO::max_poll_time" and "IO::AIO::max_outstanding". |
1358 | |
1383 | |
1359 | If not all requests were processed for whatever reason, the |
1384 | If not all requests were processed for whatever reason, the poll |
1360 | filehandle will still be ready when "poll_cb" returns, so normally |
1385 | file descriptor will still be ready when "poll_cb" returns, so |
1361 | you don't have to do anything special to have it called later. |
1386 | normally you don't have to do anything special to have it called |
|
|
1387 | later. |
1362 | |
1388 | |
1363 | Apart from calling "IO::AIO::poll_cb" when the event filehandle |
1389 | Apart from calling "IO::AIO::poll_cb" when the event filehandle |
1364 | becomes ready, it can be beneficial to call this function from loops |
1390 | becomes ready, it can be beneficial to call this function from loops |
1365 | which submit a lot of requests, to make sure the results get |
1391 | which submit a lot of requests, to make sure the results get |
1366 | processed when they become available and not just when the loop is |
1392 | processed when they become available and not just when the loop is |
… | |
… | |
1374 | Event->io (fd => IO::AIO::poll_fileno, |
1400 | Event->io (fd => IO::AIO::poll_fileno, |
1375 | poll => 'r', async => 1, |
1401 | poll => 'r', async => 1, |
1376 | cb => \&IO::AIO::poll_cb); |
1402 | cb => \&IO::AIO::poll_cb); |
1377 | |
1403 | |
1378 | IO::AIO::poll_wait |
1404 | IO::AIO::poll_wait |
1379 | If there are any outstanding requests and none of them in the result |
1405 | Wait until either at least one request is in the result phase or no |
1380 | phase, wait till the result filehandle becomes ready for reading |
1406 | requests are outstanding anymore. |
1381 | (simply does a "select" on the filehandle. This is useful if you |
1407 | |
1382 | want to synchronously wait for some requests to finish). |
1408 | This is useful if you want to synchronously wait for some requests |
|
|
1409 | to become ready, without actually handling them. |
1383 | |
1410 | |
1384 | See "nreqs" for an example. |
1411 | See "nreqs" for an example. |
1385 | |
1412 | |
1386 | IO::AIO::poll |
1413 | IO::AIO::poll |
1387 | Waits until some requests have been handled. |
1414 | Waits until some requests have been handled. |
… | |
… | |
1499 | |
1526 | |
1500 | This is a very bad function to use in interactive programs because |
1527 | This is a very bad function to use in interactive programs because |
1501 | it blocks, and a bad way to reduce concurrency because it is |
1528 | it blocks, and a bad way to reduce concurrency because it is |
1502 | inexact: Better use an "aio_group" together with a feed callback. |
1529 | inexact: Better use an "aio_group" together with a feed callback. |
1503 | |
1530 | |
1504 | It's main use is in scripts without an event loop - when you want to |
1531 | Its main use is in scripts without an event loop - when you want to |
1505 | stat a lot of files, you can write somehting like this: |
1532 | stat a lot of files, you can write somehting like this: |
1506 | |
1533 | |
1507 | IO::AIO::max_outstanding 32; |
1534 | IO::AIO::max_outstanding 32; |
1508 | |
1535 | |
1509 | for my $path (...) { |
1536 | for my $path (...) { |
… | |
… | |
1540 | IO::AIO::npending |
1567 | IO::AIO::npending |
1541 | Returns the number of requests currently in the pending state |
1568 | Returns the number of requests currently in the pending state |
1542 | (executed, but not yet processed by poll_cb). |
1569 | (executed, but not yet processed by poll_cb). |
1543 | |
1570 | |
1544 | MISCELLANEOUS FUNCTIONS |
1571 | MISCELLANEOUS FUNCTIONS |
1545 | IO::AIO implements some functions that might be useful, but are not |
1572 | IO::AIO implements some functions that are useful when you want to use |
1546 | asynchronous. |
1573 | some "Advanced I/O" function not available to in Perl, without going the |
|
|
1574 | "Asynchronous I/O" route. Many of these have an asynchronous "aio_*" |
|
|
1575 | counterpart. |
1547 | |
1576 | |
1548 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
1577 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
1549 | Calls the "eio_sendfile_sync" function, which is like |
1578 | Calls the "eio_sendfile_sync" function, which is like |
1550 | "aio_sendfile", but is blocking (this makes most sense if you know |
1579 | "aio_sendfile", but is blocking (this makes most sense if you know |
1551 | the input data is likely cached already and the output filehandle is |
1580 | the input data is likely cached already and the output filehandle is |
… | |
… | |
1607 | "IO::AIO::PROT_EXEC", "IO::AIO::PROT_READ" and/or |
1636 | "IO::AIO::PROT_EXEC", "IO::AIO::PROT_READ" and/or |
1608 | "IO::AIO::PROT_WRITE", |
1637 | "IO::AIO::PROT_WRITE", |
1609 | |
1638 | |
1610 | $flags can be a combination of "IO::AIO::MAP_SHARED" or |
1639 | $flags can be a combination of "IO::AIO::MAP_SHARED" or |
1611 | "IO::AIO::MAP_PRIVATE", or a number of system-specific flags (when |
1640 | "IO::AIO::MAP_PRIVATE", or a number of system-specific flags (when |
1612 | not available, the are defined as 0): "IO::AIO::MAP_ANONYMOUS" |
1641 | not available, the are 0): "IO::AIO::MAP_ANONYMOUS" (which is set to |
1613 | (which is set to "MAP_ANON" if your system only provides this |
1642 | "MAP_ANON" if your system only provides this constant), |
1614 | constant), "IO::AIO::MAP_HUGETLB", "IO::AIO::MAP_LOCKED", |
1643 | "IO::AIO::MAP_HUGETLB", "IO::AIO::MAP_LOCKED", |
1615 | "IO::AIO::MAP_NORESERVE", "IO::AIO::MAP_POPULATE" or |
1644 | "IO::AIO::MAP_NORESERVE", "IO::AIO::MAP_POPULATE", |
1616 | "IO::AIO::MAP_NONBLOCK" |
1645 | "IO::AIO::MAP_NONBLOCK", "IO::AIO::MAP_FIXED", |
|
|
1646 | "IO::AIO::MAP_GROWSDOWN", "IO::AIO::MAP_32BIT", |
|
|
1647 | "IO::AIO::MAP_HUGETLB" or "IO::AIO::MAP_STACK". |
1617 | |
1648 | |
1618 | If $fh is "undef", then a file descriptor of -1 is passed. |
1649 | If $fh is "undef", then a file descriptor of -1 is passed. |
1619 | |
1650 | |
1620 | $offset is the offset from the start of the file - it generally must |
1651 | $offset is the offset from the start of the file - it generally must |
1621 | be a multiple of "IO::AIO::PAGESIZE" and defaults to 0. |
1652 | be a multiple of "IO::AIO::PAGESIZE" and defaults to 0. |
… | |
… | |
1659 | "IO::AIO::SPLICE_F_MORE" and "IO::AIO::SPLICE_F_GIFT". |
1690 | "IO::AIO::SPLICE_F_MORE" and "IO::AIO::SPLICE_F_GIFT". |
1660 | |
1691 | |
1661 | See the splice(2) manpage for details. |
1692 | See the splice(2) manpage for details. |
1662 | |
1693 | |
1663 | IO::AIO::tee $r_fh, $w_fh, $length, $flags |
1694 | IO::AIO::tee $r_fh, $w_fh, $length, $flags |
1664 | Calls the GNU/Linux tee(2) syscall, see it's manpage and the |
1695 | Calls the GNU/Linux tee(2) syscall, see its manpage and the |
1665 | description for "IO::AIO::splice" above for details. |
1696 | description for "IO::AIO::splice" above for details. |
|
|
1697 | |
|
|
1698 | $actual_size = IO::AIO::pipesize $r_fh[, $new_size] |
|
|
1699 | Attempts to query or change the pipe buffer size. Obviously works |
|
|
1700 | only on pipes, and currently works only on GNU/Linux systems, and |
|
|
1701 | fails with -1/"ENOSYS" everywhere else. If anybody knows how to |
|
|
1702 | influence pipe buffer size on other systems, drop me a note. |
|
|
1703 | |
|
|
1704 | ($rfh, $wfh) = IO::AIO::pipe2 [$flags] |
|
|
1705 | This is a direct interface to the Linux pipe2(2) system call. If |
|
|
1706 | $flags is missing or 0, then this should be the same as a call to |
|
|
1707 | perl's built-in "pipe" function and create a new pipe, and works on |
|
|
1708 | systems that lack the pipe2 syscall. On win32, this case invokes |
|
|
1709 | "_pipe (..., 4096, O_BINARY)". |
|
|
1710 | |
|
|
1711 | If $flags is non-zero, it tries to invoke the pipe2 system call with |
|
|
1712 | the given flags (Linux 2.6.27, glibc 2.9). |
|
|
1713 | |
|
|
1714 | On success, the read and write file handles are returned. |
|
|
1715 | |
|
|
1716 | On error, nothing will be returned. If the pipe2 syscall is missing |
|
|
1717 | and $flags is non-zero, fails with "ENOSYS". |
|
|
1718 | |
|
|
1719 | Please refer to pipe2(2) for more info on the $flags, but at the |
|
|
1720 | time of this writing, "IO::AIO::O_CLOEXEC", "IO::AIO::O_NONBLOCK" |
|
|
1721 | and "IO::AIO::O_DIRECT" (Linux 3.4, for packet-based pipes) were |
|
|
1722 | supported. |
1666 | |
1723 | |
1667 | EVENT LOOP INTEGRATION |
1724 | EVENT LOOP INTEGRATION |
1668 | It is recommended to use AnyEvent::AIO to integrate IO::AIO |
1725 | It is recommended to use AnyEvent::AIO to integrate IO::AIO |
1669 | automatically into many event loops: |
1726 | automatically into many event loops: |
1670 | |
1727 | |