Test::AutoBuild::Lock(User Contributed Perl DocumentatTest::AutoBuild::Lock(3)NAMETest::AutoBuild::Lock - Manage a lock file to prevent concurrent
execution
SYNOPSIS
use Test::AutoBuild::LockDESCRIPTION
This module takes out an exclusive lock on a file, preventing multiple
instances of the builder running concurrently against the same build
home. The scheme to use for locking the file, can be one of "flock",
"fcntl", or "file". "fcntl" is preferred since it works across NFS. If
this isn't supported on the OS running the builder, then "flock" should
be used. As a last resort the "file" method should be used, with does a
simple file presence/creation check, although if the builder fails in a
bad way it is possible the lock will not be cleaned up correctly.
METHODS
my $stage = Test::AutoBuild::Lock->new(file => $lock_file_path, method
=> $lock_method);
Creates a new lock manager, for the file specified by the "file"
parameter. This should be a fully qualified path for the file to be
locked. The file does not have to exist beforehand, but the path
must be writable by the user running the build instance. The
"method" parameter should be one of the strings 'fcntl', 'flock' or
'file' designating the method used to acquire the lock.
my $status = $lock->lock;
Attempt to acquire the lock, returning a true value if successfull,
otherwise a false value to indicate failure (due to the lock being
held by another process).
$lock->unlock;
Release a lock previously acquired by the "lock" method. If a lock
is not explicitly released, it will be unlocked during garbage
collection (via a DESTROY method hook on this object).
AUTHORS
Daniel Berrange <dan@berrange.com> Dennis Gregorovic
<dgregorovic@alum.mit.edu>
COPYRIGHT
Copyright (C) 2004 Red Hat, Inc. Copyright (C) 2005 Daniel Berrange.
SEE ALSOperl(1), fcntl(2), flock(2), Test::AutoBuild
perl v5.14.1 2011-09-01 Test::AutoBuild::Lock(3)
