Mercurial > hg > nginx
comparison src/os/unix/ngx_process.c @ 4309:3f6040cd731e
Added shmtx interface to forcibly unlock mutexes.
It is currently used from master process on abnormal worker termination to
unlock accept mutex (unlocking of accept mutex was broken in 1.0.2). It is
expected to be used in the future to unlock other mutexes as well.
Shared mutex code was rewritten to make this possible in a safe way, i.e.
with a check if lock was actually held by the exited process. We again use
pid to lock mutex, and use separate atomic variable for a count of processes
waiting in sem_wait().
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Wed, 23 Nov 2011 13:55:38 +0000 |
parents | 59b99f217c6d |
children | 45272aab5eea |
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4308:39982fa69482 | 4309:3f6040cd731e |
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502 /* | 502 /* |
503 * unlock the accept mutex if the abnormally exited process | 503 * unlock the accept mutex if the abnormally exited process |
504 * held it | 504 * held it |
505 */ | 505 */ |
506 | 506 |
507 ngx_atomic_cmp_set(ngx_accept_mutex_ptr, pid, 0); | 507 ngx_shmtx_force_unlock(&ngx_accept_mutex, pid); |
508 } | 508 } |
509 | 509 |
510 | 510 |
511 one = 1; | 511 one = 1; |
512 process = "unknown process"; | 512 process = "unknown process"; |