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| IO::Lambda::Flock(3) | User Contributed Perl Documentation | IO::Lambda::Flock(3) |
NAME
IO::Lambda::Flock - lambda-style file lockingDESCRIPTION
The module provides file locking interface for the lambda style, implemented by using non-blocking, periodic polling of flock(2).SYNOPSIS
open LOCK, ">lock";
lambda {
# obtain the lock
context \*LOCK, timeout => 10;
flock { die "can't obtain lock" unless shift }
# while reading from handle
context $handle;
readable { ... }
# and showing status
context 0.5;
timeout { print '.'; again }
};
API
- flock($filehandle, %options) -> ($lock_obtained = 1 | $timeout = 0)
- Waits until the file lock is obtained or the timeout is expired. When successful, the (shared or exclusive) lock on $filehandle is acquired by "flock($filehandle, LOCK_NB)" call. Options:
- "timeout" or "deadline"
- These two options are synonyms, both declare the moment when the lambda waiting for the lock should give up. If undef, timeout never occurs.
- shared
- If set, "LOCK_SH" is used, otherwise "LOCK_EX".
- frequency
- Defines how often the polling for the lock should occur. If left undefined, polling occurs during idle time, when other events are dispatched.
SEE ALSO
Fcntl, IO::Lambda::Poll.AUTHOR
Dmitry Karasik, <dmitry@karasik.eu.org>.| 2012-03-14 | perl v5.32.1 |
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