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Add OPcache restart hook, fired when a restart is carried out - #23828
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zend_accel_schedule_restart_hook tells an observer that a restart of OPcache's shared memory is coming, but not whether or when it happens: the restart runs later, at request startup, on whichever thread or process first finds the cache unused, and it can stay pending for a long time. This adds zend_accel_restart_hook, called on that thread once per restart, right after the restart completed, with the same reason. A threaded SAPI needs it for its logs and metrics, since the restart rewinds shared memory that other threads may still reference.
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Rebased. The hook is now called after the SHM lock is released, which is what dstogov asked for the first hook in #15590. @arnaud-lb could you have a look? php/frankenphp#2634 is merged and reports scheduled restarts with the existing hook. This new hook is what's missing to report that the restart really happened. |
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After #15590, which added
zend_accel_schedule_restart_hook.That hook says a restart of OPcache's shared memory is coming, not that it happened: the restart runs later, at request startup, on whichever thread or process first finds the cache unused, and it can stay pending for a long time. This adds
zend_accel_restart_hook, called on that thread once per restart, right after it completed and the SHM lock is released, with the same reason.FrankenPHP needs it for its logs and metrics: under ZTS the restart rewinds shared memory that other threads may still reference, so the exact moment matters for post-mortems, and the scheduling event alone doesn't tell an operator whether the restart ran at all.