Bug #74120 [Opn]: SyncEvent fires only when someone is waiting

Edit report at https://bugs.php.net/bug.php?id=74120&edit=1 ID: 74120 Updated by: cubic@php.net Reported by: amancio at prjc dot com dot br Summary: SyncEvent fires only when someone is waiting Status: Open Type: Bug Package: PECL Operating System: Linux PHP Version: 5.6.30 -Assigned To: +Assigned To: cubic Block user comment: N Private report: N New Comment: I am unable to replicate the problem on Ubuntu Linux. However, after staring at the logic for a while, I did find two semi-related bugs with the underlying event object implementation. But neither bug should have triggered in a truly isolated setup. It would help me to know what var_dump($event->fire()) returns. Useful tip: var_dump() is frequently easier than writing if/else logic. What flavor of Linux are you running? There are subtle differences in POSIX implementations across even the most common Linux distros. Does the object exist in /dev/shm/? What permissions does it have (should be 0666)? If you delete the object manually, does the test start working as expected? Also of note: ext/sync/tests/011.phpt runs named manual event objects through its paces as best as a single process can test them. You should run the test suite to see if there are other object types broken on your platform. This command should work: pecl run-tests -p sync Previous Comments: ------------------------------------------------------------------------ [2017-02-17 15:38:27] cubic@php.net Thanks for the bug report and test case. Looks like a probable regression in manual reset event objects. I'll look into this. Note that any bugs in the PECL package will almost always reflect over here: https://github.com/cubiclesoft/cross-platform-cpp Version 1.1.0 represents a major rewrite to bypass POSIX semaphore issues on some platforms (e.g. Mac) and added support for PHP 7. Windows saw no significant changes other than PHP 7 support. That at least explains why any regressions took place. ------------------------------------------------------------------------ [2017-02-17 13:58:25] amancio at prjc dot com dot br Description: ------------ Using package 'sync' PECL extension; When an instance of SyncEvent calls fire() in a thread, the other instance of SyncEvent just gets fired if it is executing wait(). If the thread is processing other things, the next call to wait() will wait indefinitely. This bad behaviour was observed just on Linux with sync 1.1.0. On Windows, sync 1.1.0 behaves correctly (the next call to wait() knows the event was already fired). Sync 1.0.1 (the previous version) behaves correctly on both platforms, Windows and Linux. Test script: --------------- // a single-threaded example: $event = new SyncEvent("Test-123", true); $event->fire(); if ($event->wait(0)) echo "Fired, ok"; else echo "Not fired?"; Expected result: ---------------- On any platform, any version should have to print "Fired, ok". Actual result: -------------- On Windows, Sync 1.0.1 and 1.1.0 prints "Fired, ok". On Linux, Sync 1.0.1 prints "Fired, ok", but Sync 1.1.0 prints "Not fired?". ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=74120&edit=1