php Programming Glossary: flock

http://stackoverflow.com/questions/1209688/php-simultaneous-file-writes

usual way of addressing this is to have both scripts use flock for locking f fopen 'some_file' 'a' flock f LOCK_EX fwrite f.. both scripts use flock for locking f fopen 'some_file' 'a' flock f LOCK_EX fwrite f some_line n fclose f This will cause the.. less important script can do f fopen 'some_file' 'a' if flock f LOCK_EX LOCK_NB fwrite f some_line n fclose f so that it will..

PHP loop acting as cronjob[ensure only one instance running]

http://stackoverflow.com/questions/1780823/php-loop-acting-as-cronjobensure-only-one-instance-running

ensure only one copy of your script is running is to use flock to obtain a file lock. For example php fp fopen tmp lock.txt.. a file lock. For example php fp fopen tmp lock.txt r if flock fp LOCK_EX do an exclusive lock ftruncate fp 0 truncate file.. fp 0 truncate file fwrite fp Write something here n flock fp LOCK_UN release the lock else echo Couldn't get the lock..

PHP mutual exclusion (mutex)

http://stackoverflow.com/questions/2921469/php-mutual-exclusion-mutex

They all mainly direct to http php.net manual en function.flock.php . This page talks about opening a file on the hard disk.. there are few threading implementations . The easy one is flock. It's guaranteed to work on all platforms. However if you compile.. f fopen ' path to myfile' 'r' if f return false if flock f LOCK_SH ret fread f 8192 flock f LOCK_UN fclose f return ret..

best way to obtain a lock in php

http://stackoverflow.com/questions/325806/best-way-to-obtain-a-lock-in-php

what I've found so far is mysql's GET_LOCK and php's flock . Anything else worth considering Update I've found sem_acquire.. have any thread synchronization objects This class uses flock as a base to provide locking functionality. Lock will be released.. if this own TRUE this unlock function lock if flock this file LOCK_EX failed key this key error_log ExclusiveLock..

Atomically appending a line to a file and creating it if it doesn't exist

http://stackoverflow.com/questions/9096470/atomically-appending-a-line-to-a-file-and-creating-it-if-it-doesnt-exist

assume PIPE_BUF is 4096 Linux fp fopen file 'a' if lock flock fp LOCK_EX throw new Exception 'Cannot lock file '. file fwrite.. Exception 'Cannot lock file '. file fwrite fp data if lock flock fp LOCK_UN fclose fp It works OK but it seems to be a quite..