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annotate src/core/ngx_shmtx.h @ 460:bb941a2996a6 NGINX_0_7_42

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nginx 0.7.42 *) Change: now the "Invalid argument" error returned by setsockopt(TCP_NODELAY) on Solaris, is ignored. *) Change: now if a file specified in a "auth_basic_user_file" directive is absent, then the 405 error is returned instead of the 500 one. *) Feature: the "auth_basic_user_file" directive supports variables. Thanks to Kirill A. Korinskiy. *) Feature: the "listen" directive supports the "ipv6only" parameter. Thanks to Zhang Hua. *) Bugfix: in an "alias" directive with references to captures of regular expressions; the bug had appeared in 0.7.40. *) Bugfix: compatibility with Tru64 UNIX. Thanks to Dustin Marquess. *) Bugfix: nginx could not be built without PCRE library; the bug had appeared in 0.7.41.
author Igor Sysoev <http://sysoev.ru>
date Mon, 16 Mar 2009 00:00:00 +0300
parents 5bef04fc3fd5
children d4da38525468
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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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9
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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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41
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42
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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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55
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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 #if __osf__ /* Tru64 UNIX */
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61
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62 if (err == NGX_EACCESS) {
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63 return 0;
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64 }
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65
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66 #endif
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67
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68 ngx_log_abort(err, ngx_trylock_fd_n " %s failed", mtx->name);
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69
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70 return 0;
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71 }
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74 static ngx_inline void
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75 ngx_shmtx_lock(ngx_shmtx_t *mtx)
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76 {
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77 ngx_err_t err;
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78
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79 err = ngx_lock_fd(mtx->fd);
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80
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81 if (err == 0) {
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82 return;
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83 }
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85 ngx_log_abort(err, ngx_lock_fd_n " %s failed", mtx->name);
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86 }
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89 static ngx_inline void
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90 ngx_shmtx_unlock(ngx_shmtx_t *mtx)
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91 {
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92 ngx_err_t err;
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93
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94 err = ngx_unlock_fd(mtx->fd);
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95
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96 if (err == 0) {
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97 return;
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98 }
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100 ngx_log_abort(err, ngx_unlock_fd_n " %s failed", mtx->name);
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101 }
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102
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103
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104 void ngx_shmtx_destory(ngx_shmtx_t *mtx);
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105
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106 #endif
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107
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109 #endif /* _NGX_SHMTX_H_INCLUDED_ */