On Fri, February 15, 2008 6:42 pm, Michael McGlothlin wrote:
> Does anyone have a good method of supporting semaphores when PHP's
> System V IPC functions can't be enabled? I'm trying to implement
> locking
> for using shmop (actually modifying someone elses code) and it
> requires
> sysvmsg but my shared host doesn't have this enabled.

mkdir is atomic, so you should be able to use that to create a
semaphore/lock

Just in case something gets wedged, you might check the
http://php.net/filemtime of the dir, and ignore anything super stale.

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