Mercurial > hg > nginx-quic

annotate src/core/ngx_shmtx.h @ 4311:45272aab5eea

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Unlock of shared memory zones on process crash. If process exited abnormally while holding lock on some shared memory zone - unlock it. It may be not safe thing to do (as crash with lock held may result in corrupted shared memory structure, and other processes will subsequently crash while trying to access shared data), therefore complain loudly if unlock succeeds.
author Maxim Dounin <mdounin@mdounin.ru>
date Wed, 23 Nov 2011 14:09:19 +0000
parents 3f6040cd731e
children d620f497c50f
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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7 #ifndef _NGX_SHMTX_H_INCLUDED_
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8 #define _NGX_SHMTX_H_INCLUDED_
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11 #include <ngx_config.h>
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12 #include <ngx_core.h>
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15 typedef struct {
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16 ngx_atomic_t lock;
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17 #if (NGX_HAVE_POSIX_SEM)
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18 ngx_atomic_t wait;
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19 #endif
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20 } ngx_shmtx_sh_t;
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23 typedef struct {
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24 #if (NGX_HAVE_ATOMIC_OPS)
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25 ngx_atomic_t *lock;
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26 #if (NGX_HAVE_POSIX_SEM)
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27 ngx_atomic_t *wait;
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28 ngx_uint_t semaphore;
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29 sem_t sem;
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30 #endif
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31 #else
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32 ngx_fd_t fd;
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33 u_char *name;
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34 #endif
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35 ngx_uint_t spin;
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36 } ngx_shmtx_t;
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37
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38
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39 ngx_int_t ngx_shmtx_create(ngx_shmtx_t *mtx, ngx_shmtx_sh_t *addr,
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40 u_char *name);
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41 void ngx_shmtx_destory(ngx_shmtx_t *mtx);
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42 ngx_uint_t ngx_shmtx_trylock(ngx_shmtx_t *mtx);
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43 void ngx_shmtx_lock(ngx_shmtx_t *mtx);
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44 void ngx_shmtx_unlock(ngx_shmtx_t *mtx);
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45 ngx_uint_t ngx_shmtx_force_unlock(ngx_shmtx_t *mtx, ngx_pid_t pid);
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48 #endif /* _NGX_SHMTX_H_INCLUDED_ */