Req #80737 [Opn->Nab]: blocking flock() with timeout

Edit report at https://bugs.php.net/bug.php?id=80737&edit=1 ID: 80737 Updated by: krakjoe@php.net Reported by: maggus dot staab+php at googlemail dot com Summary: blocking flock() with timeout -Status: Open +Status: Not a bug Type: Feature/Change Request Package: Filesystem function related Operating System: ubuntu16/18/20 PHP Version: 7.4.15 Block user comment: N Private report: N New Comment: Sorry, but your problem does not imply a bug in PHP itself. For a list of more appropriate places to ask for help using PHP, please visit http://www.php.net/support.php as this bug system is not the appropriate forum for asking support questions. Due to the volume of reports we can not explain in detail here why your report is not a bug. The support channels will be able to provide an explanation for you. Thank you for your interest in PHP. I'm afraid there's no portable way to achieve this, and so nothing we can (or should try to) do in php-src. Previous Comments: ------------------------------------------------------------------------ [2021-02-12 10:50:49] maggus dot staab+php at googlemail dot com Description: ------------ I did a lot of research regarding flock() and timeouts. I found workarounds using pcntl_signal/alarm which only work on the CLI: https://github.com/php-lock/lock/blob/8b254edfe1400a733e3cde571e981687e6f6d804/classes/util/PcntlTimeout.php#L68-L94 our current workaround is to use LOCK_NB in a loop + usleep() until it succeeds, which feels rather hacky and wastes a lot of IO especially on NFS based volumes. This was the only way I found to get it working in a web sapi. wouldn't it be possible to e.g. take a stream_set_timeout() into account for the blocking flock() case? Test script: --------------- $fd = fopen("/path/to/my/file", 'c+'); stream_set_timeout($fd, 0, 1); var_dump(flock($fd, LOCK_EX)); // should return false on timeout $info = stream_get_meta_data($fd); var_dump($info); // should report a timeout ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=80737&edit=1