NAME
Linux::Futex - Perl extension for using Futexes
SYNOPSIS
use Linux::Futex ();
my $mutex_buf = " ";
my $mutex = Linux::Futex::addr($mutex_buf);
Linux::Futex::init($mutex); # Execute once to set to zero
Linux::Futex::lock($mutex);
# do something critical
Linux::Futex::unlock($mutex);Note that this examples mutex is local so wouldn't be much use for inter-process. Use shared memory (eg. IPC::SharedMem) to make this work.
DESCRIPTION
This perl module implements the high performance lightweight process synchronization method using 'futexes' implemented in recent Linux Kernels.
EXPORT
None by default.
- addr()
-
Return the address of a string for use in mutex calls. Uses the same format as IPC::SharedMem. Requires a string of at least 4 bytes.
- init()
-
Initialize the futex with 0
- lock()
-
Lock the futex. If currently locked then block until released.
- unlock()
-
Unlock the futex. If not currently locked then no-op.
SEE ALSO
The original paper on which this code is based:
Futexes Are Tricky by Ulrich Drepper (<drepper@redhat.com>), (Published on Nov 5, 2011)
Some further discussion and improvements in:
AUTHOR
Nick Townsend, <nick.townsend@mac.com>
COPYRIGHT AND LICENSE
Copyright (C) 2014 by Nick Townsend
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.10.1 or, at your option, any later version of Perl 5 you may have available.