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annotate src/core/ngx_shmtx.h @ 3909:0daede16d68b

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use POSIX semaphores in shmtx instead of sched_yield() number of spinlock spins are increased twice
author Igor Sysoev <igor@sysoev.ru>
date Tue, 10 May 2011 11:39:13 +0000
parents e345fcf61a12
children 3f6040cd731e 4919fb357a5d
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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 #if (NGX_HAVE_ATOMIC_OPS)
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17 ngx_atomic_t *lock;
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18 #if (NGX_HAVE_POSIX_SEM)
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19 ngx_uint_t semaphore;
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20 sem_t sem;
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21 #endif
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22 #else
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23 ngx_fd_t fd;
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24 u_char *name;
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25 #endif
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26 ngx_uint_t spin;
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27 } ngx_shmtx_t;
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29
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30 ngx_int_t ngx_shmtx_create(ngx_shmtx_t *mtx, void *addr, u_char *name);
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31 void ngx_shmtx_destory(ngx_shmtx_t *mtx);
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32 ngx_uint_t ngx_shmtx_trylock(ngx_shmtx_t *mtx);
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33 void ngx_shmtx_lock(ngx_shmtx_t *mtx);
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34 void ngx_shmtx_unlock(ngx_shmtx_t *mtx);
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37 #endif /* _NGX_SHMTX_H_INCLUDED_ */