[ViewVC] Diff of: cvs/IO-AIO/AIO.pm

Comparing IO-AIO/AIO.pm (file contents):
Revision 1.285 by root, Tue Jul 17 23:20:08 2018 UTC vs.
Revision 1.303 by root, Wed Apr 3 03:09:04 2019 UTC

 use common::sense;
 use base 'Exporter';
 BEGIN {
-   our $VERSION = 4.41;
+   our $VERSION = 4.72;
    our @AIO_REQ = qw(aio_sendfile aio_seek aio_read aio_write aio_open aio_close
                      aio_stat aio_lstat aio_unlink aio_rmdir aio_readdir aio_readdirx
                      aio_scandir aio_symlink aio_readlink aio_realpath aio_fcntl aio_ioctl
                      aio_sync aio_fsync aio_syncfs aio_fdatasync aio_sync_file_range
    IO::AIO::idle_timeout $seconds
    IO::AIO::max_outstanding $maxreqs
    IO::AIO::nreqs
    IO::AIO::nready
    IO::AIO::npending
+   IO::AIO::reinit
    $nfd = IO::AIO::get_fdlimit [EXPERIMENTAL]
    IO::AIO::min_fdlimit $nfd [EXPERIMENTAL]
    IO::AIO::sendfile $ofh, $ifh, $offset, $count
    IO::AIO::fadvise $fh, $offset, $len, $advice
    IO::AIO::mmap $scalar, $length, $prot, $flags[, $fh[, $offset]]
    IO::AIO::munmap $scalar
    IO::AIO::mremap $scalar, $new_length, $flags[, $new_address]
    IO::AIO::madvise $scalar, $offset, $length, $advice
    IO::AIO::mprotect $scalar, $offset, $length, $protect
    IO::AIO::munlock $scalar, $offset = 0, $length = undef
    IO::AIO::munlockall
+   # stat extensions
+   $counter = IO::AIO::st_gen
+   $seconds = IO::AIO::st_atime, IO::AIO::st_mtime, IO::AIO::st_ctime, IO::AIO::st_btime
+   ($atime, $mtime, $ctime, $btime, ...) = IO::AIO::st_xtime
+   $nanoseconds = IO::AIO::st_atimensec, IO::AIO::st_mtimensec, IO::AIO::st_ctimensec, IO::AIO::st_btimensec
+   $seconds = IO::AIO::st_btimesec
+   ($atime, $mtime, $ctime, $btime, ...) = IO::AIO::st_xtimensec
+   # very much unportable syscalls
+   IO::AIO::splice $r_fh, $r_off, $w_fh, $w_off, $length, $flags
+   IO::AIO::tee $r_fh, $w_fh, $length, $flags
+   $actual_size = IO::AIO::pipesize $r_fh[, $new_size]
+   ($rfh, $wfh) = IO::AIO::pipe2 [$flags]
+   $fh = IO::AIO::memfd_create $pathname[, $flags]
+   $fh = IO::AIO::eventfd [$initval, [$flags]]
+   $fh = IO::AIO::timerfd_create $clockid[, $flags]
+   ($cur_interval, $cur_value) = IO::AIO::timerfd_settime $fh, $flags, $new_interval, $nbw_value
+   ($cur_interval, $cur_value) = IO::AIO::timerfd_gettime $fh
 =head2 API NOTES
 All the C<aio_*> calls are more or less thin wrappers around the syscall
 with the same name (sans C<aio_>). The arguments are similar or identical,
 following POSIX and non-POSIX constants are available (missing ones on
 your system are, as usual, C<0>):
 C<O_ASYNC>, C<O_DIRECT>, C<O_NOATIME>, C<O_CLOEXEC>, C<O_NOCTTY>, C<O_NOFOLLOW>,
 C<O_NONBLOCK>, C<O_EXEC>, C<O_SEARCH>, C<O_DIRECTORY>, C<O_DSYNC>,
-C<O_RSYNC>, C<O_SYNC>, C<O_PATH>, C<O_TMPFILE>, and C<O_TTY_INIT>.
+C<O_RSYNC>, C<O_SYNC>, C<O_PATH>, C<O_TMPFILE>, C<O_TTY_INIT> and C<O_ACCMODE>.
 =item aio_close $fh, $callback->($status)
 Asynchronously close a file and call the callback with the result
 =item aio_stat  $fh_or_path, $callback->($status)
 =item aio_lstat $fh, $callback->($status)
-Works like perl's C<stat> or C<lstat> in void context. The callback will
+Works almost exactly like perl's C<stat> or C<lstat> in void context. The
-be called after the stat and the results will be available using C<stat _>
+callback will be called after the stat and the results will be available
-or C<-s _> etc...
+using C<stat _> or C<-s _> and other tests (with the exception of C<-B>
+and C<-T>).
 The pathname passed to C<aio_stat> must be absolute. See API NOTES, above,
 for an explanation.
 Currently, the stats are always 64-bit-stats, i.e. instead of returning an
 behaviour).
 C<S_IFMT>, C<S_IFIFO>, C<S_IFCHR>, C<S_IFBLK>, C<S_IFLNK>, C<S_IFREG>,
 C<S_IFDIR>, C<S_IFWHT>, C<S_IFSOCK>, C<IO::AIO::major $dev_t>,
 C<IO::AIO::minor $dev_t>, C<IO::AIO::makedev $major, $minor>.
+To access higher resolution stat timestamps, see L<SUBSECOND STAT TIME
+ACCESS>.
 Example: Print the length of F</etc/passwd>:
    aio_stat "/etc/passwd", sub {
       $_[0] and die "stat failed: $!";
 Works like perl's C<utime> function (including the special case of $atime
 and $mtime being undef). Fractional times are supported if the underlying
 syscalls support them.
-When called with a pathname, uses utimes(2) if available, otherwise
+When called with a pathname, uses utimensat(2) or utimes(2) if available,
-utime(2). If called on a file descriptor, uses futimes(2) if available,
+otherwise utime(2). If called on a file descriptor, uses futimens(2)
-otherwise returns ENOSYS, so this is not portable.
+or futimes(2) if available, otherwise returns ENOSYS, so this is not
+portable.
 Examples:
    # set atime and mtime to current time (basically touch(1)):
    aio_utime "path", undef, undef;
       aioreq_pri $pri;
       add $grp aio_stat $wd, sub {
          return $grp->result () if $_[0];
          my $now = time;
          my $hash1 = join ":", (stat _)[0,1,3,7,9];
+         my $rdxflags = READDIR_DIRS_FIRST;
+         if ((stat _)[3] < 2) {
+            # at least one non-POSIX filesystem exists
+            # that returns useful DT_type values: btrfs,
+            # so optimise for this here by requesting dents
+            $rdxflags |= READDIR_DENTS;
+         }
          # read the directory entries
          aioreq_pri $pri;
-         add $grp aio_readdirx $wd, READDIR_DIRS_FIRST, sub {
+         add $grp aio_readdirx $wd, $rdxflags, sub {
-            my $entries = shift
+            my ($entries, $flags) = @_
                or return $grp->result ();
+            if ($rdxflags & READDIR_DENTS) {
+               # if we requested type values, see if we can use them directly.
+               # if there were any DT_UNKNOWN entries then we assume we
+               # don't know. alternatively, we could assume that if we get
+               # one DT_DIR, then all directories are indeed marked with
+               # DT_DIR, but this seems not required for btrfs, and this
+               # is basically the "btrfs can't get it's act together" code
+               # branch.
+               unless ($flags & READDIR_FOUND_UNKNOWN) {
+                  # now we have valid DT_ information for all entries,
+                  # so use it as an optimisation without further stat's.
+                  # they must also all be at the beginning of @$entries
+                  # by now.
+                  my $dirs;
+                  if (@$entries) {
+                     for (0 .. $#$entries) {
+                        if ($entries->[$_][1] != DT_DIR) {
+                           # splice out directories
+                           $dirs = [splice @$entries, 0, $_];
+                           last;
+                        }
+                     }
+                     # if we didn't find any non-dir, then all entries are dirs
+                     unless ($dirs) {
+                        ($dirs, $entries) = ($entries, []);
+                     }
+                  } else {
+                     # directory is empty, so there are no sbdirs
+                     $dirs = [];
+                  }
+                  # either splice'd the directories out or the dir was empty.
+                  # convert dents to filenames
+                  $_ = $_->[0] for @$dirs;
+                  $_ = $_->[0] for @$entries;
+                  return $grp->result ($dirs, $entries);
+               }
+               # cannot use, so return to our old ways
+               # by pretending we only scanned for names.
+               $_ = $_->[0] for @$entries;
+            }
             # stat the dir another time
             aioreq_pri $pri;
             add $grp aio_stat $wd, sub {
                my $hash2 = join ":", (stat _)[0,1,3,7,9];
 So in general, you should only use these calls for things that do
 (filesystem) I/O, not for things that wait for other events (network,
 other processes), although if you are careful and know what you are doing,
 you still can.
-The following constants are available (missing ones are, as usual C<0>):
+The following constants are available and can be used for normal C<ioctl>
+and C<fcntl> as well (missing ones are, as usual C<0>):
 C<F_DUPFD_CLOEXEC>,
 C<F_OFD_GETLK>, C<F_OFD_SETLK>, C<F_OFD_GETLKW>,
 C<FIFREEZE>, C<FITHAW>, C<FITRIM>, C<FICLONE>, C<FICLONERANGE>, C<FIDEDUPERANGE>.
+C<F_ADD_SEALS>, C<F_GET_SEALS>, C<F_SEAL_SEAL>, C<F_SEAL_SHRINK>, C<F_SEAL_GROW> and
+C<F_SEAL_WRITE>.
 C<FS_IOC_GETFLAGS>, C<FS_IOC_SETFLAGS>, C<FS_IOC_GETVERSION>, C<FS_IOC_SETVERSION>,
 C<FS_IOC_FIEMAP>.
 C<FS_IOC_FSGETXATTR>, C<FS_IOC_FSSETXATTR>, C<FS_IOC_SET_ENCRYPTION_POLICY>,
    IO::AIO::mmap $data, -s $fh, IO::AIO::PROT_READ, IO::AIO::MAP_SHARED, $fh;
    aio_mlock $data; # mlock in background
 =item aio_mlockall $flags, $callback->($status)
-Calls the C<mlockall> function with the given C<$flags> (a combination of
+Calls the C<mlockall> function with the given C<$flags> (a
-C<IO::AIO::MCL_CURRENT> and C<IO::AIO::MCL_FUTURE>).
+combination of C<IO::AIO::MCL_CURRENT>, C<IO::AIO::MCL_FUTURE> and
+C<IO::AIO::MCL_ONFAULT>).
 On systems that do not implement C<mlockall>, this function returns C<-1>
-and sets errno to C<ENOSYS>.
+and sets errno to C<ENOSYS>. Similarly, flag combinations not supported
+by the system result in a return value of C<-1> with errno being set to
+C<EINVAL>.
 Note that the corresponding C<munlockall> is synchronous and is
 documented under L<MISCELLANEOUS FUNCTIONS>.
 Example: asynchronously lock all current and future pages into memory.
 The default value for the limit is C<0>, but note that setting a feeder
 automatically bumps it up to C<2>.
 =back
 =head2 SUPPORT FUNCTIONS
 =head3 EVENT PROCESSING AND EVENT LOOP INTEGRATION
 =over 4
 Strictly equivalent to:
    IO::AIO::poll_wait, IO::AIO::poll_cb
       while IO::AIO::nreqs;
+This function can be useful at program aborts, to make sure outstanding
+I/O has been done (C<IO::AIO> uses an C<END> block which already calls
+this function on normal exits), or when you are merely using C<IO::AIO>
+for its more advanced functions, rather than for async I/O, e.g.:
+   my ($dirs, $nondirs);
+   IO::AIO::aio_scandir "/tmp", 0, sub { ($dirs, $nondirs) = @_ };
+   IO::AIO::flush;
+   # $dirs, $nondirs are now set
 =item IO::AIO::max_poll_reqs $nreqs
 =item IO::AIO::max_poll_time $seconds
 These set the maximum number of requests (default C<0>, meaning infinity)
               poll => 'r', nice => 1,
               cb => &IO::AIO::poll_cb);
 =back
 =head3 CONTROLLING THE NUMBER OF THREADS
 =over
 =item IO::AIO::min_parallel $nthreads
 The default value for C<max_outstanding> is very large, so there is no
 practical limit on the number of outstanding requests.
 =back
 =head3 STATISTICAL INFORMATION
 =over
 =item IO::AIO::nreqs
 Returns the number of requests currently in the pending state (executed,
 but not yet processed by poll_cb).
 =back
+=head3 SUBSECOND STAT TIME ACCESS
+Both C<aio_stat>/C<aio_lstat> and perl's C<stat>/C<lstat> functions can
+generally find access/modification and change times with subsecond time
+accuracy of the system supports it, but perl's built-in functions only
+return the integer part.
+The following functions return the timestamps of the most recent
+stat with subsecond precision on most systems and work both after
+C<aio_stat>/C<aio_lstat> and perl's C<stat>/C<lstat> calls. Their return
+value is only meaningful after a successful C<stat>/C<lstat> call, or
+during/after a successful C<aio_stat>/C<aio_lstat> callback.
+This is similar to the L<Time::HiRes> C<stat> functions, but can return
+full resolution without rounding and work with standard perl C<stat>,
+alleviating the need to call the special C<Time::HiRes> functions, which
+do not act like their perl counterparts.
+On operating systems or file systems where subsecond time resolution is
+not supported or could not be detected, a fractional part of C<0> is
+returned, so it is always safe to call these functions.
+=over 4
+=item $seconds = IO::AIO::st_atime, IO::AIO::st_mtime, IO::AIO::st_ctime, IO::AIO::st_btime
+Return the access, modication, change or birth time, respectively,
+including fractional part. Due to the limited precision of floating point,
+the accuracy on most platforms is only a bit better than milliseconds
+for times around now - see the I<nsec> function family, below, for full
+accuracy.
+File birth time is only available when the OS and perl support it (on
+FreeBSD and NetBSD at the time of this writing, although support is
+adaptive, so if your OS/perl gains support, IO::AIO can take advantage of
+it). On systems where it isn't available, C<0> is currently returned, but
+this might change to C<undef> in a future version.
+=item ($atime, $mtime, $ctime, $btime, ...) = IO::AIO::st_xtime
+Returns access, modification, change and birth time all in one go, and
+maybe more times in the future version.
+=item $nanoseconds = IO::AIO::st_atimensec, IO::AIO::st_mtimensec, IO::AIO::st_ctimensec, IO::AIO::st_btimensec
+Return the fractional access, modifcation, change or birth time, in nanoseconds,
+as an integer in the range C<0> to C<999999999>.
+Note that no accessors are provided for access, modification and
+change times - you need to get those from C<stat _> if required (C<int
+IO::AIO::st_atime> and so on will I<not> generally give you the correct
+value).
+=item $seconds = IO::AIO::st_btimesec
+The (integral) seconds part of the file birth time, if available.
+=item ($atime, $mtime, $ctime, $btime, ...) = IO::AIO::st_xtimensec
+Like the functions above, but returns all four times in one go (and maybe
+more in future versions).
+=item $counter = IO::AIO::st_gen
+Returns the generation counter (in practice this is just a random number)
+of the file. This is only available on platforms which have this member in
+their C<struct stat> (most BSDs at the time of this writing) and generally
+only to the root usert. If unsupported, C<0> is returned, but this might
+change to C<undef> in a future version.
+=back
+Example: print the high resolution modification time of F</etc>, using
+C<stat>, and C<IO::AIO::aio_stat>.
+   if (stat "/etc") {
+      printf "stat(/etc) mtime: %f\n", IO::AIO::st_mtime;
+   }
+   IO::AIO::aio_stat "/etc", sub {
+      $_[0]
+         and return;
+      printf "aio_stat(/etc) mtime: %d.%09d\n", (stat _)[9], IO::AIO::st_mtimensec;
+   };
+   IO::AIO::flush;
+Output of the awbove on my system, showing reduced and full accuracy:
+   stat(/etc) mtime: 1534043702.020808
+   aio_stat(/etc) mtime: 1534043702.020807792
 =head3 MISCELLANEOUS FUNCTIONS
 IO::AIO implements some functions that are useful when you want to use
 some "Advanced I/O" function not available to in Perl, without going the
 =item IO::AIO::munmap $scalar
 Removes a previous mmap and undefines the C<$scalar>.
-=item IO::AIO::mremap $scalar, $new_length, $flags = 0[, $new_address = 0]
+=item IO::AIO::mremap $scalar, $new_length, $flags = MREMAP_MAYMOVE[, $new_address = 0]
 Calls the Linux-specific mremap(2) system call. The C<$scalar> must have
 been mapped by C<IO::AIO::mmap>, and C<$flags> must currently either be
 C<0> or C<IO::AIO::MREMAP_MAYMOVE>.
 C<IO::AIO::MREMAP_FIXED> and the C<$new_address> argument are currently
 implemented, but not supported and might go away in a future version.
 On systems where this call is not supported or is not emulated, this call
 returns falls and sets C<$!> to C<ENOSYS>.
+=item IO::AIO::mlockall $flags
+Calls the C<eio_mlockall_sync> function, which is like C<aio_mlockall>,
+but is blocking.
 =item IO::AIO::munlock $scalar, $offset = 0, $length = undef
 Calls the C<munlock> function, undoing the effects of a previous
 C<aio_mlock> call (see its description for details).
 Example: create a pipe race-free w.r.t. threads and fork:
    my ($rfh, $wfh) = IO::AIO::pipe2 IO::AIO::O_CLOEXEC
       or die "pipe2: $!\n";
+=item $fh = IO::AIO::memfd_create $pathname[, $flags]
+This is a direct interface to the Linux L<memfd_create(2)> system
+call. The (unhelpful) default for C<$flags> is C<0>, but your default
+should be C<IO::AIO::MFD_CLOEXEC>.
+On success, the new memfd filehandle is returned, otherwise returns
+C<undef>. If the memfd_create syscall is missing, fails with C<ENOSYS>.
+Please refer to L<memfd_create(2)> for more info on this call.
+The following C<$flags> values are available: C<IO::AIO::MFD_CLOEXEC>,
+C<IO::AIO::MFD_ALLOW_SEALING> and C<IO::AIO::MFD_HUGETLB>.
+Example: create a new memfd.
+   my $fh = IO::AIO::memfd_create "somenameforprocfd", IO::AIO::MFD_CLOEXEC
+      or die "m,emfd_create: $!\n";
 =item $fh = IO::AIO::eventfd [$initval, [$flags]]
 This is a direct interface to the Linux L<eventfd(2)> system call. The
 (unhelpful) defaults for C<$initval> and C<$flags> are C<0> for both.
 The following symbol flag values are available: C<IO::AIO::EFD_CLOEXEC>,
 C<IO::AIO::EFD_NONBLOCK> and C<IO::AIO::EFD_SEMAPHORE> (Linux 2.6.30).
 Example: create a new eventfd filehandle:
-   $fh = IO::AIO::eventfd 0, IO::AIO::O_CLOEXEC
+   $fh = IO::AIO::eventfd 0, IO::AIO::EFD_CLOEXEC
       or die "eventfd: $!\n";
 =item $fh = IO::AIO::timerfd_create $clockid[, $flags]
-This is a direct interface to the Linux L<timerfd_create(2)> system call. The
+This is a direct interface to the Linux L<timerfd_create(2)> system
-(unhelpful) default for C<$flags> is C<0>.
+call. The (unhelpful) default for C<$flags> is C<0>, but your default
+should be C<IO::AIO::TFD_CLOEXEC>.
 On success, the new timerfd filehandle is returned, otherwise returns
-C<undef>. If the eventfd syscall is missing, fails with C<ENOSYS>.
+C<undef>. If the timerfd_create syscall is missing, fails with C<ENOSYS>.
 Please refer to L<timerfd_create(2)> for more info on this call.
 The following C<$clockid> values are
 available: C<IO::AIO::CLOCK_REALTIME>, C<IO::AIO::CLOCK_MONOTONIC>

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Comparing IO-AIO/AIO.pm (file contents): Revision 1.285 by root, Tue Jul 17 23:20:08 2018 UTC vs. Revision 1.303 by root, Wed Apr 3 03:09:04 2019 UTC

Diff Legend

Comparing IO-AIO/AIO.pm (file contents):
Revision 1.285 by root, Tue Jul 17 23:20:08 2018 UTC vs.
Revision 1.303 by root, Wed Apr 3 03:09:04 2019 UTC