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annotate src/core/ngx_shmtx.h @ 274:052a7b1d40e5 NGINX_0_5_7

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nginx 0.5.7 *) Feature: the ssl_session_cache storage optimization. *) Bugfixes in the "ssl_session_cache" and "limit_zone" directives. *) Bugfix: the segmentation fault was occurred on start or while reconfiguration if the "ssl_session_cache" or "limit_zone" directives were used on 64-bit platforms. *) Bugfix: a segmentation fault occurred if the "add_before_body" or "add_after_body" directives were used and there was no "Content-Type" header line in response. *) Bugfix: the OpenSSL library was always built with the threads support. Thanks to Den Ivanov. *) Bugfix: the PCRE-6.5+ library and the icc compiler compatibility.
author Igor Sysoev <http://sysoev.ru>
date Mon, 15 Jan 2007 00:00:00 +0300
parents 6ae1357b7b7c
children 5bef04fc3fd5
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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 #else
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19 ngx_fd_t fd;
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20 u_char *name;
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21 #endif
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22 } ngx_shmtx_t;
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25 ngx_int_t ngx_shmtx_create(ngx_shmtx_t *mtx, void *addr, u_char *name);
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28 #if (NGX_HAVE_ATOMIC_OPS)
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30 static ngx_inline ngx_uint_t
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31 ngx_shmtx_trylock(ngx_shmtx_t *mtx)
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32 {
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33 return (*mtx->lock == 0 && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid));
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34 }
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36 #define ngx_shmtx_lock(mtx) ngx_spinlock((mtx)->lock, ngx_pid, 1024)
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38 #define ngx_shmtx_unlock(mtx) (void) ngx_atomic_cmp_set((mtx)->lock, ngx_pid, 0)
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39
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40 #define ngx_shmtx_destory(mtx)
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43 #else
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44
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45 static ngx_inline ngx_uint_t
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46 ngx_shmtx_trylock(ngx_shmtx_t *mtx)
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47 {
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48 ngx_err_t err;
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49
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50 err = ngx_trylock_fd(mtx->fd);
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51
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52 if (err == 0) {
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53 return 1;
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54 }
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56 if (err == NGX_EAGAIN) {
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57 return 0;
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58 }
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60 ngx_log_abort(err, ngx_trylock_fd_n " failed");
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61 }
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64 static ngx_inline void
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65 ngx_shmtx_lock(ngx_shmtx_t *mtx)
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66 {
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67 ngx_err_t err;
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68
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69 err = ngx_lock_fd(mtx->fd);
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71 if (err == 0) {
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72 return;
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73 }
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75 ngx_log_abort(err, ngx_lock_fd_n " failed");
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76 }
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79 static ngx_inline void
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80 ngx_shmtx_unlock(ngx_shmtx_t *mtx)
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81 {
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82 ngx_err_t err;
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83
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84 err = ngx_unlock_fd(mtx->fd);
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85
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86 if (err == 0) {
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87 return;
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88 }
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90 ngx_log_abort(err, ngx_unlock_fd_n " failed");
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91 }
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94 void ngx_shmtx_destory(ngx_shmtx_t *mtx);
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95
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96 #endif
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99 #endif /* _NGX_SHMTX_H_INCLUDED_ */