1 | =head1 NAME |
1 | =head1 NAME |
2 | |
2 | |
3 | IO::AIO - Asynchronous Input/Output |
3 | IO::AIO - Asynchronous/Advanced Input/Output |
4 | |
4 | |
5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
6 | |
6 | |
7 | use IO::AIO; |
7 | use IO::AIO; |
8 | |
8 | |
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57 | functions available on many operating systems. However, they are often |
57 | functions available on many operating systems. However, they are often |
58 | not well-supported or restricted (GNU/Linux doesn't allow them on normal |
58 | not well-supported or restricted (GNU/Linux doesn't allow them on normal |
59 | files currently, for example), and they would only support aio_read and |
59 | files currently, for example), and they would only support aio_read and |
60 | aio_write, so the remaining functionality would have to be implemented |
60 | aio_write, so the remaining functionality would have to be implemented |
61 | using threads anyway. |
61 | using threads anyway. |
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62 | |
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63 | In addition to asynchronous I/O, this module also exports some rather |
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64 | arcane interfaces, such as C<madvise> or linux's C<splice> system call, |
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65 | which is why the C<A> in C<AIO> can also mean I<advanced>. |
62 | |
66 | |
63 | Although the module will work in the presence of other (Perl-) threads, |
67 | Although the module will work in the presence of other (Perl-) threads, |
64 | it is currently not reentrant in any way, so use appropriate locking |
68 | it is currently not reentrant in any way, so use appropriate locking |
65 | yourself, always call C<poll_cb> from within the same thread, or never |
69 | yourself, always call C<poll_cb> from within the same thread, or never |
66 | call C<poll_cb> (or other C<aio_> functions) recursively. |
70 | call C<poll_cb> (or other C<aio_> functions) recursively. |
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1248 | So in general, you should only use these calls for things that do |
1252 | So in general, you should only use these calls for things that do |
1249 | (filesystem) I/O, not for things that wait for other events (network, |
1253 | (filesystem) I/O, not for things that wait for other events (network, |
1250 | other processes), although if you are careful and know what you are doing, |
1254 | other processes), although if you are careful and know what you are doing, |
1251 | you still can. |
1255 | you still can. |
1252 | |
1256 | |
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1257 | The following constants are available (missing ones are, as usual C<0>): |
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1258 | |
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1259 | C<FIFREEZE>, C<FITHAW>, C<FITRIM>, C<FICLONE>, C<FICLONERANGE>, C<FIDEDUPERANGE>. |
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1260 | |
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1261 | C<FS_IOC_GETFLAGS>, C<FS_IOC_SETFLAGS>, C<FS_IOC_GETVERSION>, C<FS_IOC_SETVERSION>, |
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1262 | C<FS_IOC_FIEMAP>. |
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1263 | |
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1264 | C<FS_IOC_FSGETXATTR>, C<FS_IOC_FSSETXATTR>, C<FS_IOC_SET_ENCRYPTION_POLICY>, |
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1265 | C<FS_IOC_GET_ENCRYPTION_PWSALT>, C<FS_IOC_GET_ENCRYPTION_POLICY>, C<FS_KEY_DESCRIPTOR_SIZE>. |
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1266 | |
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1267 | C<FS_SECRM_FL>, C<FS_UNRM_FL>, C<FS_COMPR_FL>, C<FS_SYNC_FL>, C<FS_IMMUTABLE_FL>, |
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1268 | C<FS_APPEND_FL>, C<FS_NODUMP_FL>, C<FS_NOATIME_FL>, C<FS_DIRTY_FL>, |
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1269 | C<FS_COMPRBLK_FL>, C<FS_NOCOMP_FL>, C<FS_ENCRYPT_FL>, C<FS_BTREE_FL>, |
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1270 | C<FS_INDEX_FL>, C<FS_JOURNAL_DATA_FL>, C<FS_NOTAIL_FL>, C<FS_DIRSYNC_FL>, C<FS_TOPDIR_FL>, |
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1271 | C<FS_FL_USER_MODIFIABLE>. |
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1272 | |
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1273 | C<FS_XFLAG_REALTIME>, C<FS_XFLAG_PREALLOC>, C<FS_XFLAG_IMMUTABLE>, C<FS_XFLAG_APPEND>, |
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1274 | C<FS_XFLAG_SYNC>, C<FS_XFLAG_NOATIME>, C<FS_XFLAG_NODUMP>, C<FS_XFLAG_RTINHERIT>, |
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1275 | C<FS_XFLAG_PROJINHERIT>, C<FS_XFLAG_NOSYMLINKS>, C<FS_XFLAG_EXTSIZE>, C<FS_XFLAG_EXTSZINHERIT>, |
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1276 | C<FS_XFLAG_NODEFRAG>, C<FS_XFLAG_FILESTREAM>, C<FS_XFLAG_DAX>, C<FS_XFLAG_HASATTR>, |
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1277 | |
1253 | =item aio_sync $callback->($status) |
1278 | =item aio_sync $callback->($status) |
1254 | |
1279 | |
1255 | Asynchronously call sync and call the callback when finished. |
1280 | Asynchronously call sync and call the callback when finished. |
1256 | |
1281 | |
1257 | =item aio_fsync $fh, $callback->($status) |
1282 | =item aio_fsync $fh, $callback->($status) |
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2041 | =item IO::AIO::madvise $scalar, $offset, $len, $advice |
2066 | =item IO::AIO::madvise $scalar, $offset, $len, $advice |
2042 | |
2067 | |
2043 | Simply calls the C<posix_madvise> function (see its |
2068 | Simply calls the C<posix_madvise> function (see its |
2044 | manpage for details). The following advice constants are |
2069 | manpage for details). The following advice constants are |
2045 | available: C<IO::AIO::MADV_NORMAL>, C<IO::AIO::MADV_SEQUENTIAL>, |
2070 | available: C<IO::AIO::MADV_NORMAL>, C<IO::AIO::MADV_SEQUENTIAL>, |
2046 | C<IO::AIO::MADV_RANDOM>, C<IO::AIO::MADV_WILLNEED>, C<IO::AIO::MADV_DONTNEED>. |
2071 | C<IO::AIO::MADV_RANDOM>, C<IO::AIO::MADV_WILLNEED>, C<IO::AIO::MADV_DONTNEED>, |
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2072 | C<IO::AIO::MADV_FREE>. |
2047 | |
2073 | |
2048 | On systems that do not implement C<posix_madvise>, this function returns |
2074 | On systems that do not implement C<posix_madvise>, this function returns |
2049 | ENOSYS, otherwise the return value of C<posix_madvise>. |
2075 | ENOSYS, otherwise the return value of C<posix_madvise>. |
2050 | |
2076 | |
2051 | =item IO::AIO::mprotect $scalar, $offset, $len, $protect |
2077 | =item IO::AIO::mprotect $scalar, $offset, $len, $protect |