Mercurial > hg > nginx
comparison src/event/ngx_event.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 | d620f497c50f |
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4308:39982fa69482 | 4309:3f6040cd731e |
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519 shared = shm.addr; | 519 shared = shm.addr; |
520 | 520 |
521 ngx_accept_mutex_ptr = (ngx_atomic_t *) shared; | 521 ngx_accept_mutex_ptr = (ngx_atomic_t *) shared; |
522 ngx_accept_mutex.spin = (ngx_uint_t) -1; | 522 ngx_accept_mutex.spin = (ngx_uint_t) -1; |
523 | 523 |
524 if (ngx_shmtx_create(&ngx_accept_mutex, shared, cycle->lock_file.data) | 524 if (ngx_shmtx_create(&ngx_accept_mutex, (ngx_shmtx_sh_t *) shared, |
525 cycle->lock_file.data) | |
525 != NGX_OK) | 526 != NGX_OK) |
526 { | 527 { |
527 return NGX_ERROR; | 528 return NGX_ERROR; |
528 } | 529 } |
529 | 530 |