note 74493 added to function.flock

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) ---- Server IP: 213.92.11.19 Probable Submitter: 192.92.126.136 (proxied: HTTP/1.0 infocache[C05C7E88] (Traffic-Server/3.0.3 [uNcM])) ---- Manual Page -- http://www.php.net/manual/en/function.flock.php Edit -- https://master.php.net/note/edit/74493 Del: integrated -- https://master.php.net/note/delete/74493/integrated Del: useless -- https://master.php.net/note/delete/74493/useless Del: bad code -- https://master.php.net/note/delete/74493/bad+code Del: spam -- https://master.php.net/note/delete/74493/spam Del: non-english -- https://master.php.net/note/delete/74493/non-english Del: in docs -- https://master.php.net/note/delete/74493/in+docs Del: other reasons-- https://master.php.net/note/delete/74493 Reject -- https://master.php.net/note/reject/74493 Search -- https://master.php.net/manage/user-notes.php