note 74493 deleted from function.flock by nlopess

Note Submitter: marco at hotelsandgo dot com ---- Alternative to flock using spin-lock (completely portable, in theory works on all filesystems and all OS): function _acquireFileMutex($s) { while(file_exists($s)) sleep(1); $mutex=fopen($s, 'w'); global $mutex; } function _releaseFileMutex($s) { fclose($mutex); unlink($s); } Notes: a) $s is a lock-file b) sleep(1) is only for optimization (reduces spin-lock by suspending directly on the scheduler); in my behavior 1 second is appropriate. You can remove it (replace with a ;) or replace with a usleep, time_nanosleep, or similar... I stress tested it, is so simple :) Ideas: This is completely portable, if you want something more professional, busy wait can be removed using pipes... (php has function to create pipes, however i'm not sure that are portables)