#39991 [Fbk->Opn]: session_write_close

ID: 39991 User updated by: mauricebis at gmail dot com Reported By: mauricebis at gmail dot com -Status: Feedback +Status: Open -Bug Type: Filesystem function related +Bug Type: Session related Operating System: linux -PHP Version: 4.4.4 +PHP Version: 4.4.3-dev New Comment: I have one process P1 which calls session_start() and then sets some session variables. I've another proces P2 which also calls session_start() at the beginning and which is blocked due to the locking policy of session_start() waiting for the lock to be released. P1 now calls session_write_close(). We would then expect P2 to read the new values of the session variables. But I experienced a race condition whereby P2 was allowed to proceed and couldn't read the new values of the session variables. In other words, it seems that in some situations, session_write_close() releases the lock before the possible updates to session variables are made visible to other processes. Previous Comments: ------------------------------------------------------------------------ [2006-12-30 22:37:32] tony2001@php.net Not enough information was provided for us to be able to handle this bug. Please re-read the instructions at http://bugs.php.net/how-to-report.php If you can provide more information, feel free to add it to this bug and change the status back to "Open". Thank you for your interest in PHP. ------------------------------------------------------------------------ [2006-12-30 11:10:35] mauricebis at gmail dot com Description: ------------ I experienced a race situation with session_write_close where the lock (acquired in session_start) was released before the updated $_SESSION variables were visible to other processes. Another process blocked on session_start was allowed to proceed but could not read the session variables supposedly written through session_write_close. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=39991&edit=1