[ViewVC] Diff of: cvs/IO-AIO/README

Comparing IO-AIO/README (file contents):
Revision 1.23 by root, Mon Jan 22 15:59:52 2007 UTC vs.
Revision 1.35 by root, Tue Apr 21 20:06:05 2009 UTC

      $req->cancel; # cancel request if still in queue
      my $grp = aio_group sub { print "all stats done\n" };
      add $grp aio_stat "..." for ...;
+     # AnyEvent integration (EV, Event, Glib, Tk, POE, urxvt, pureperl...)
+     use AnyEvent::AIO;
-     # AnyEvent integration
+     # EV integration
-     open my $fh, "<&=" . IO::AIO::poll_fileno or die "$!";
+     my $w = EV::io IO::AIO::poll_fileno, EV::READ, \&IO::AIO::poll_cb;
-     my $w = AnyEvent->io (fh => $fh, poll => 'r', cb => sub { IO::AIO::poll_cb });
      # Event integration
      Event->io (fd => IO::AIO::poll_fileno,
                 poll => 'r',
                 cb => \&IO::AIO::poll_cb);
     faster on a RAID volume or over NFS when you do a number of stat
     operations concurrently.
     While most of this works on all types of file descriptors (for example
     sockets), using these functions on file descriptors that support
-    nonblocking operation (again, sockets, pipes etc.) is very inefficient
+    nonblocking operation (again, sockets, pipes etc.) is very inefficient.
-    or might not work (aio_read fails on sockets/pipes/fifos). Use an event
-    loop for that (such as the Event module): IO::AIO will naturally fit
+    Use an event loop for that (such as the Event module): IO::AIO will
-    into such an event loop itself.
+    naturally fit into such an event loop itself.
     In this version, a number of threads are started that execute your
     requests and signal their completion. You don't need thread support in
     perl, and the threads created by this module will not be visible to
     perl. In the future, this module might make use of the native aio
     not well-supported or restricted (GNU/Linux doesn't allow them on normal
     files currently, for example), and they would only support aio_read and
     aio_write, so the remaining functionality would have to be implemented
     using threads anyway.
-    Although the module will work with in the presence of other (Perl-)
+    Although the module will work in the presence of other (Perl-) threads,
-    threads, it is currently not reentrant in any way, so use appropriate
+    it is currently not reentrant in any way, so use appropriate locking
-    locking yourself, always call "poll_cb" from within the same thread, or
+    yourself, always call "poll_cb" from within the same thread, or never
-    never call "poll_cb" (or other "aio_" functions) recursively.
+    call "poll_cb" (or other "aio_" functions) recursively.
   EXAMPLE
     This is a simple example that uses the Event module and loads
     /etc/passwd asynchronously:
     All the "aio_*" calls are more or less thin wrappers around the syscall
     with the same name (sans "aio_"). The arguments are similar or
     identical, and they all accept an additional (and optional) $callback
     argument which must be a code reference. This code reference will get
     called with the syscall return code (e.g. most syscalls return -1 on
-    error, unlike perl, which usually delivers "false") as it's sole
+    error, unlike perl, which usually delivers "false") as its sole argument
-    argument when the given syscall has been executed asynchronously.
+    after the given syscall has been executed asynchronously.
     All functions expecting a filehandle keep a copy of the filehandle
     internally until the request has finished.
     All functions return request objects of type IO::AIO::REQ that allow
     the user environment, d) use Glib::filename_from_unicode on unicode
     filenames or e) use something else to ensure your scalar has the correct
     contents.
     This works, btw. independent of the internal UTF-8 bit, which IO::AIO
-    handles correctly wether it is set or not.
+    handles correctly whether it is set or not.
     $prev_pri = aioreq_pri [$pri]
         Returns the priority value that would be used for the next request
         and, if $pri is given, sets the priority for the next aio request.
               }
            };
     aio_close $fh, $callback->($status)
         Asynchronously close a file and call the callback with the result
-        code. *WARNING:* although accepted, you should not pass in a perl
+        code.
-        filehandle here, as perl will likely close the file descriptor
-        another time when the filehandle is destroyed. Normally, you can
-        safely call perls "close" or just let filehandles go out of scope.
-        This is supposed to be a bug in the API, so that might change. It's
+        Unfortunately, you can't do this to perl. Perl *insists* very
-        therefore best to avoid this function.
+        strongly on closing the file descriptor associated with the
+        filehandle itself.
+        Therefore, "aio_close" will not close the filehandle - instead it
+        will use dup2 to overwrite the file descriptor with the write-end of
+        a pipe (the pipe fd will be created on demand and will be cached).
+        Or in other words: the file descriptor will be closed, but it will
+        not be free for reuse until the perl filehandle is closed.
     aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
     aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
-        Reads or writes "length" bytes from the specified "fh" and "offset"
+        Reads or writes $length bytes from or to the specified $fh and
-        into the scalar given by "data" and offset "dataoffset" and calls
+        $offset into the scalar given by $data and offset $dataoffset and
-        the callback without the actual number of bytes read (or -1 on
+        calls the callback without the actual number of bytes read (or -1 on
         error, just like the syscall).
+        "aio_read" will, like "sysread", shrink or grow the $data scalar to
+        offset plus the actual number of bytes read.
+        If $offset is undefined, then the current file descriptor offset
+        will be used (and updated), otherwise the file descriptor offset
+        will not be changed by these calls.
+        If $length is undefined in "aio_write", use the remaining length of
+        $data.
+        If $dataoffset is less than zero, it will be counted from the end of
+        $data.
         The $data scalar *MUST NOT* be modified in any way while the request
-        is outstanding. Modifying it can result in segfaults or WW3 (if the
+        is outstanding. Modifying it can result in segfaults or World War
-        necessary/optional hardware is installed).
+        III (if the necessary/optional hardware is installed).
         Example: Read 15 bytes at offset 7 into scalar $buffer, starting at
         offset 0 within the scalar:
            aio_read $fh, 7, 15, $buffer, 0, sub {
            aio_stat "/etc/passwd", sub {
               $_[0] and die "stat failed: $!";
               print "size is ", -s _, "\n";
            };
+    aio_utime $fh_or_path, $atime, $mtime, $callback->($status)
+        Works like perl's "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
+        utime(2). If called on a file descriptor, uses 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;
+           # set atime to current time and mtime to beginning of the epoch:
+           aio_utime "path", time, undef; # undef==0
+    aio_chown $fh_or_path, $uid, $gid, $callback->($status)
+        Works like perl's "chown" function, except that "undef" for either
+        $uid or $gid is being interpreted as "do not change" (but -1 can
+        also be used).
+        Examples:
+           # same as "chown root path" in the shell:
+           aio_chown "path", 0, -1;
+           # same as above:
+           aio_chown "path", 0, undef;
+    aio_truncate $fh_or_path, $offset, $callback->($status)
+        Works like truncate(2) or ftruncate(2).
+    aio_chmod $fh_or_path, $mode, $callback->($status)
+        Works like perl's "chmod" function.
     aio_unlink $pathname, $callback->($status)
         Asynchronously unlink (delete) a file and call the callback with the
         result code.
     aio_mknod $path, $mode, $dev, $callback->($status)
     aio_copy $srcpath, $dstpath, $callback->($status)
         Try to copy the *file* (directories not supported as either source
         or destination) from $srcpath to $dstpath and call the callback with
         the 0 (error) or -1 ok.
-        This is a composite request that it creates the destination file
+        This is a composite request that creates the destination file with
-        with mode 0200 and copies the contents of the source file into it
+        mode 0200 and copies the contents of the source file into it using
-        using "aio_sendfile", followed by restoring atime, mtime, access
+        "aio_sendfile", followed by restoring atime, mtime, access mode and
-        mode and uid/gid, in that order.
+        uid/gid, in that order.
         If an error occurs, the partial destination file will be unlinked,
         if possible, except when setting atime, mtime, access mode and
         uid/gid, where errors are being ignored.
     aio_move $srcpath, $dstpath, $callback->($status)
         Try to move the *file* (directories not supported as either source
         or destination) from $srcpath to $dstpath and call the callback with
         the 0 (error) or -1 ok.
-        This is a composite request that tries to rename(2) the file first.
+        This is a composite request that tries to rename(2) the file first;
-        If rename files with "EXDEV", it copies the file with "aio_copy"
+        if rename fails with "EXDEV", it copies the file with "aio_copy"
-        and, if that is successful, unlinking the $srcpath.
+        and, if that is successful, unlinks the $srcpath.
     aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
         Scans a directory (similar to "aio_readdir") but additionally tries
         to efficiently separate the entries of directory $path into two sets
         of names, directories you can recurse into (directories), and ones
         Delete a directory tree starting (and including) $path, return the
         status of the final "rmdir" only. This is a composite request that
         uses "aio_scandir" to recurse into and rmdir directories, and unlink
         everything else.
+    aio_sync $callback->($status)
+        Asynchronously call sync and call the callback when finished.
     aio_fsync $fh, $callback->($status)
         Asynchronously call fsync on the given filehandle and call the
         callback with the fsync result code.
     aio_fdatasync $fh, $callback->($status)
         Asynchronously call fdatasync on the given filehandle and call the
         callback with the fdatasync result code.
         If this call isn't available because your OS lacks it or it couldn't
         be detected, it will be emulated by calling "fsync" instead.
+    aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status)
+        Sync the data portion of the file specified by $offset and $length
+        to disk (but NOT the metadata), by calling the Linux-specific
+        sync_file_range call. If sync_file_range is not available or it
+        returns ENOSYS, then fdatasync or fsync is being substituted.
+        $flags can be a combination of
+        "IO::AIO::SYNC_FILE_RANGE_WAIT_BEFORE",
+        "IO::AIO::SYNC_FILE_RANGE_WRITE" and
+        "IO::AIO::SYNC_FILE_RANGE_WAIT_AFTER": refer to the sync_file_range
+        manpage for details.
+    aio_pathsync $path, $callback->($status)
+        This request tries to open, fsync and close the given path. This is
+        a composite request intended to sync directories after directory
+        operations (E.g. rename). This might not work on all operating
+        systems or have any specific effect, but usually it makes sure that
+        directory changes get written to disc. It works for anything that
+        can be opened for read-only, not just directories.
+        Passes 0 when everything went ok, and -1 on error.
     aio_group $callback->(...)
         This is a very special aio request: Instead of doing something, it
         is a container for other aio requests, which is useful if you want
         to bundle many requests into a single, composite, request with a
        };
     This makes it very easy to create composite requests (see the source of
     "aio_move" for an application) that work and feel like simple requests.
-    * The IO::AIO::GRP objects will be cleaned up during calls to
+    *   The IO::AIO::GRP objects will be cleaned up during calls to
-    "IO::AIO::poll_cb", just like any other request.
+        "IO::AIO::poll_cb", just like any other request.
-    * They can be canceled like any other request. Canceling will cancel not
+    *   They can be canceled like any other request. Canceling will cancel
-    only the request itself, but also all requests it contains.
+        not only the request itself, but also all requests it contains.
-    * They can also can also be added to other IO::AIO::GRP objects.
+    *   They can also can also be added to other IO::AIO::GRP objects.
-    * You must not add requests to a group from within the group callback
+    *   You must not add requests to a group from within the group callback
-    (or any later time).
+        (or any later time).
     Their lifetime, simplified, looks like this: when they are empty, they
     will finish very quickly. If they contain only requests that are in the
     "done" state, they will also finish. Otherwise they will continue to
     exist.
-    That means after creating a group you have some time to add requests.
+    That means after creating a group you have some time to add requests
-    And in the callbacks of those requests, you can add further requests to
+    (precisely before the callback has been invoked, which is only done
-    the group. And only when all those requests have finished will the the
+    within the "poll_cb"). And in the callbacks of those requests, you can
-    group itself finish.
+    add further requests to the group. And only when all those requests have
+    finished will the the group itself finish.
     add $grp ...
     $grp->add (...)
         Add one or more requests to the group. Any type of IO::AIO::REQ can
         be added, including other groups, as long as you do not create
         request itself. Useful when you queued a lot of events but got a
         result early.
     $grp->result (...)
         Set the result value(s) that will be passed to the group callback
-        when all subrequests have finished and set thre groups errno to the
+        when all subrequests have finished and set the groups errno to the
         current value of errno (just like calling "errno" without an error
         number). By default, no argument will be passed and errno is zero.
     $grp->errno ([$errno])
         Sets the group errno value to $errno, or the current value of errno
         does not impose any limits).
         If the feed does not queue more requests when called, it will be
         automatically removed from the group.
-        If the feed limit is 0, it will be set to 2 automatically.
+        If the feed limit is 0 when this method is called, it will be set to
+        2 automatically.
         Example:
            # stat all files in @files, but only ever use four aio requests concurrently:
     limit $grp $num
         Sets the feeder limit for the group: The feeder will be called
         whenever the group contains less than this many requests.
         Setting the limit to 0 will pause the feeding process.
+        The default value for the limit is 0, but note that setting a feeder
+        automatically bumps it up to 2.
   SUPPORT FUNCTIONS
    EVENT PROCESSING AND EVENT LOOP INTEGRATION
     $fileno = IO::AIO::poll_fileno
         Return the *request result pipe file descriptor*. This filehandle
         See "poll_cb" for an example.
     IO::AIO::poll_cb
         Process some outstanding events on the result pipe. You have to call
-        this regularly. Returns the number of events processed. Returns
+        this regularly. Returns 0 if all events could be processed, or -1 if
-        immediately when no events are outstanding. The amount of events
+        it returned earlier for whatever reason. Returns immediately when no
+        events are outstanding. The amount of events processed depends on
-        processed depends on the settings of "IO::AIO::max_poll_req" and
+        the settings of "IO::AIO::max_poll_req" and
         "IO::AIO::max_poll_time".
         If not all requests were processed for whatever reason, the
-        filehandle will still be ready when "poll_cb" returns.
+        filehandle will still be ready when "poll_cb" returns, so normally
+        you don't have to do anything special to have it called later.
         Example: Install an Event watcher that automatically calls
         IO::AIO::poll_cb with high priority:
            Event->io (fd => IO::AIO::poll_fileno,
         The default is probably ok in most situations, especially if thread
         creation is fast. If thread creation is very slow on your system you
         might want to use larger values.
-    $oldmaxreqs = IO::AIO::max_outstanding $maxreqs
+    IO::AIO::max_outstanding $maxreqs
         This is a very bad function to use in interactive programs because
         it blocks, and a bad way to reduce concurrency because it is
         inexact: Better use an "aio_group" together with a feed callback.
-        Sets the maximum number of outstanding requests to $nreqs. If you to
+        Sets the maximum number of outstanding requests to $nreqs. If you do
         queue up more than this number of requests, the next call to the
         "poll_cb" (and "poll_some" and other functions calling "poll_cb")
         function will block until the limit is no longer exceeded.
         The default value is very large, so there is no practical limit on
         the number of outstanding requests.
         You can still queue as many requests as you want. Therefore,
-        "max_oustsanding" is mainly useful in simple scripts (with low
+        "max_outstanding" is mainly useful in simple scripts (with low
         values) or as a stop gap to shield against fatal memory overflow
         (with large values).
    STATISTICAL INFORMATION
     IO::AIO::nreqs
     bytes of memory. In addition, stat requests need a stat buffer (possibly
     a few hundred bytes), readdir requires a result buffer and so on. Perl
     scalars and other data passed into aio requests will also be locked and
     will consume memory till the request has entered the done state.
-    This is now awfully much, so queuing lots of requests is not usually a
+    This is not awfully much, so queuing lots of requests is not usually a
     problem.
     Per-thread usage:
     In the execution phase, some aio requests require more memory for
 KNOWN BUGS
     Known bugs will be fixed in the next release.
 SEE ALSO
-    Coro::AIO.
+    AnyEvent::AIO for easy integration into event loops, Coro::AIO for a
+    more natural syntax.
 AUTHOR
      Marc Lehmann <schmorp@schmorp.de>
      http://home.schmorp.de/

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Comparing IO-AIO/README (file contents): Revision 1.23 by root, Mon Jan 22 15:59:52 2007 UTC vs. Revision 1.35 by root, Tue Apr 21 20:06:05 2009 UTC

Diff Legend

Comparing IO-AIO/README (file contents):
Revision 1.23 by root, Mon Jan 22 15:59:52 2007 UTC vs.
Revision 1.35 by root, Tue Apr 21 20:06:05 2009 UTC