Mercurial > hg > nginx

annotate src/os/unix/ngx_freebsd_rfork_thread.c @ 272:d4e65d74db9f

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nginx-0.0.2-2004-03-01-00:03:02 import
author Igor Sysoev <igor@sysoev.ru>
date Sun, 29 Feb 2004 21:03:02 +0000
parents e16dfb9b9afa
children 4b1a3a4acc60
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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d4e65d74db9f nginx-0.0.2-2004-03-01-00:03:02 import
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1
d4e65d74db9f nginx-0.0.2-2004-03-01-00:03:02 import
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2 /*
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3 * Copyright (C) 2002-2004 Igor Sysoev, http://sysoev.ru/en/
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4 */
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5
3
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6
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fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
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7 #include <ngx_config.h>
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
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8 #include <ngx_core.h>
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
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9
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5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
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10 /*
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11 * The threads implementation uses the rfork(RFPROC|RFTHREAD|RFMEM)
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
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12 * to create threads. All threads use the stacks of the same size mmap()ed
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
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13 * below the main stack. Thus the stack pointer is used to determine
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
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14 * the current thread id.
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
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15 *
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
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16 * The mutex implementation uses the ngx_atomic_cmp_set() operation
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
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17 * to acquire mutex and the SysV semaphore to wait on a mutex or to wake up
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
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18 * the waiting threads.
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
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19 *
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
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20 * The condition variable implementation uses the SysV semaphore set of two
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
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21 * semaphores. The first is used by the CV mutex, and the second is used
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
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22 * by CV itself.
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23 *
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
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24 * This threads implementation currently works on i486 and amd64
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
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25 * platforms only.
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26 */
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29 ngx_int_t ngx_threaded;
d4e65d74db9f nginx-0.0.2-2004-03-01-00:03:02 import
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30 char *ngx_freebsd_kern_usrstack;
d4e65d74db9f nginx-0.0.2-2004-03-01-00:03:02 import
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31 size_t ngx_thread_stack_size;
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32
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33
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34 static size_t rz_size = /* STUB: PAGE_SIZE */ 4096;
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35 static size_t usable_stack_size;
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
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36 static char *last_stack;
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37
266
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38 static ngx_uint_t nthreads;
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39 static ngx_uint_t max_threads;
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40 static ngx_tid_t *tids; /* the threads tids array */
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41
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43 /* the thread-safe libc errno */
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44
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45 static int errno0; /* the main thread's errno */
266
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46 static int *errnos; /* the threads errno's array */
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47
34a521b1a148 nginx-0.0.1-2002-08-20-18:48:28 import
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48 int *__error()
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49 {
86
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
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50 int tid;
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
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51
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
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52 tid = ngx_gettid();
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53
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
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54 return tid ? &errnos[tid - 1] : &errno0;
3
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55 }
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57
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58 /*
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59 * __isthreaded enables the spinlocks in some libc functions, i.e. in malloc()
267
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60 * and some other places. Nevertheless we protect our malloc()/free() calls
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
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61 * by own mutex that is more efficient than the spinlock.
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
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62 *
272
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63 * _spinlock() is a weak referenced stub in src/lib/libc/gen/_spinlock_stub.c
d4e65d74db9f nginx-0.0.2-2004-03-01-00:03:02 import
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64 * that does nothing.
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65 */
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66
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67 extern int __isthreaded;
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68
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69 void _spinlock(ngx_atomic_t *lock)
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70 {
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71 ngx_int_t tries;
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72
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73 tries = 0;
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74
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75 for ( ;; ) {
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76
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77 if (*lock) {
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78 if (ngx_freebsd_hw_ncpu > 1 && tries++ < 1000) {
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79 continue;
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80 }
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81
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82 sched_yield();
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83 tries = 0;
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84
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85 } else {
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86 if (ngx_atomic_cmp_set(lock, 0, 1)) {
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87 return;
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88 }
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89 }
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90 }
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91 }
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92
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93
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94 /*
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95 * Before FreeBSD 5.1 _spinunlock() is a simple #define in
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96 * src/lib/libc/include/spinlock.h that zeroes lock.
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97 *
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98 * Since FreeBSD 5.1 _spinunlock() is a weak referenced stub in
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99 * src/lib/libc/gen/_spinlock_stub.c that does nothing.
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100 */
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101
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102 #ifndef _spinunlock
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103
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104 void _spinunlock(ngx_atomic_t *lock)
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105 {
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106 *lock = 0;
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107 }
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108
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109 #endif
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110
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111
86
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112 int ngx_create_thread(ngx_tid_t *tid, int (*func)(void *arg), void *arg,
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
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113 ngx_log_t *log)
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114 {
266
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115 int id, err;
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116 char *stack, *stack_top;
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117
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118 if (nthreads >= max_threads) {
86
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
119 ngx_log_error(NGX_LOG_CRIT, log, 0,
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
120 "no more than %d threads can be created", max_threads);
84
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
121 return NGX_ERROR;
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
122 }
3
34a521b1a148 nginx-0.0.1-2002-08-20-18:48:28 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
123
272
d4e65d74db9f nginx-0.0.2-2004-03-01-00:03:02 import
Igor Sysoev <igor@sysoev.ru>
parents: 271
diff changeset
124 last_stack -= ngx_thread_stack_size;
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
125
86
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
126 stack = mmap(last_stack, usable_stack_size, PROT_READ|PROT_WRITE,
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
127 MAP_STACK, -1, 0);
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
128
86
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
129 if (stack == MAP_FAILED) {
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
130 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
267
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
131 "mmap(" PTR_FMT ":" SIZE_T_FMT
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
132 ", MAP_STACK) thread stack failed",
86
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
133 last_stack, usable_stack_size);
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
134 return NGX_ERROR;
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
135 }
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
136
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
137 if (stack != last_stack) {
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
138 ngx_log_error(NGX_LOG_ALERT, log, 0, "stack address was changed");
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
139 }
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
140
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
141 stack_top = stack + usable_stack_size;
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
142
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
143 ngx_log_debug2(NGX_LOG_DEBUG_CORE, log, 0,
267
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
144 "thread stack: " PTR_FMT "-" PTR_FMT, stack, stack_top);
86
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
145
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
146 #if 1
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
147 id = rfork_thread(RFPROC|RFTHREAD|RFMEM, stack_top, func, arg);
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
148 #elif 1
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
149 id = rfork_thread(RFPROC|RFMEM, stack_top, func, arg);
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
150 #elif 1
85
3549c2bf9eaf nginx-0.0.1-2003-05-07-21:32:45 import
Igor Sysoev <igor@sysoev.ru>
parents: 84
diff changeset
151 id = rfork_thread(RFFDG|RFCFDG, stack_top, func, arg);
84
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
152 #else
86
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
153 id = rfork(RFFDG|RFCFDG);
84
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
154 #endif
86
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
155
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
156 err = ngx_errno;
3
34a521b1a148 nginx-0.0.1-2002-08-20-18:48:28 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
157
84
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
158 if (id == -1) {
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
159 ngx_log_error(NGX_LOG_ALERT, log, err, "rfork() failed");
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
160
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
161 } else {
3
34a521b1a148 nginx-0.0.1-2002-08-20-18:48:28 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
162 *tid = id;
272
d4e65d74db9f nginx-0.0.2-2004-03-01-00:03:02 import
Igor Sysoev <igor@sysoev.ru>
parents: 271
diff changeset
163 nthreads = (ngx_freebsd_kern_usrstack - stack_top)
d4e65d74db9f nginx-0.0.2-2004-03-01-00:03:02 import
Igor Sysoev <igor@sysoev.ru>
parents: 271
diff changeset
164 / ngx_thread_stack_size;
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
165 tids[nthreads] = id;
84
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
166
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
167 ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0, "rfork()ed thread: %d", id);
84
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
168 }
3
34a521b1a148 nginx-0.0.1-2002-08-20-18:48:28 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
169
34a521b1a148 nginx-0.0.1-2002-08-20-18:48:28 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
170 return err;
34a521b1a148 nginx-0.0.1-2002-08-20-18:48:28 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
171 }
34a521b1a148 nginx-0.0.1-2002-08-20-18:48:28 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
172
34a521b1a148 nginx-0.0.1-2002-08-20-18:48:28 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
173
270
7bb9562216ce nginx-0.0.2-2004-02-25-23:16:15 import
Igor Sysoev <igor@sysoev.ru>
parents: 267
diff changeset
174 ngx_int_t ngx_init_threads(int n, size_t size, ngx_cycle_t *cycle)
3
34a521b1a148 nginx-0.0.1-2002-08-20-18:48:28 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
175 {
267
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
176 size_t len;
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
177 char *red_zone, *zone;
84
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
178
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
179 max_threads = n;
84
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
180
272
d4e65d74db9f nginx-0.0.2-2004-03-01-00:03:02 import
Igor Sysoev <igor@sysoev.ru>
parents: 271
diff changeset
181 len = sizeof(ngx_freebsd_kern_usrstack);
d4e65d74db9f nginx-0.0.2-2004-03-01-00:03:02 import
Igor Sysoev <igor@sysoev.ru>
parents: 271
diff changeset
182 if (sysctlbyname("kern.usrstack", &ngx_freebsd_kern_usrstack, &len,
d4e65d74db9f nginx-0.0.2-2004-03-01-00:03:02 import
Igor Sysoev <igor@sysoev.ru>
parents: 271
diff changeset
183 NULL, 0) == -1)
d4e65d74db9f nginx-0.0.2-2004-03-01-00:03:02 import
Igor Sysoev <igor@sysoev.ru>
parents: 271
diff changeset
184 {
270
7bb9562216ce nginx-0.0.2-2004-02-25-23:16:15 import
Igor Sysoev <igor@sysoev.ru>
parents: 267
diff changeset
185 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
84
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
186 "sysctlbyname(kern.usrstack) failed");
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
187 return NGX_ERROR;
3
34a521b1a148 nginx-0.0.1-2002-08-20-18:48:28 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
188 }
34a521b1a148 nginx-0.0.1-2002-08-20-18:48:28 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
189
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
190 /* the main thread stack red zone */
272
d4e65d74db9f nginx-0.0.2-2004-03-01-00:03:02 import
Igor Sysoev <igor@sysoev.ru>
parents: 271
diff changeset
191 red_zone = ngx_freebsd_kern_usrstack - (size + rz_size);
86
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
192
270
7bb9562216ce nginx-0.0.2-2004-02-25-23:16:15 import
Igor Sysoev <igor@sysoev.ru>
parents: 267
diff changeset
193 ngx_log_debug2(NGX_LOG_DEBUG_CORE, cycle->log, 0,
267
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
194 "usrstack: " PTR_FMT " red zone: " PTR_FMT,
272
d4e65d74db9f nginx-0.0.2-2004-03-01-00:03:02 import
Igor Sysoev <igor@sysoev.ru>
parents: 271
diff changeset
195 ngx_freebsd_kern_usrstack, red_zone);
3
34a521b1a148 nginx-0.0.1-2002-08-20-18:48:28 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
196
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
197 zone = mmap(red_zone, rz_size, PROT_NONE, MAP_ANON, -1, 0);
84
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
198 if (zone == MAP_FAILED) {
270
7bb9562216ce nginx-0.0.2-2004-02-25-23:16:15 import
Igor Sysoev <igor@sysoev.ru>
parents: 267
diff changeset
199 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
267
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
200 "mmap(" PTR_FMT ":" SIZE_T_FMT
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
201 ", PROT_NONE, MAP_ANON) red zone failed",
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
202 red_zone, rz_size);
84
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
203 return NGX_ERROR;
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
204 }
86
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
205
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
206 if (zone != red_zone) {
270
7bb9562216ce nginx-0.0.2-2004-02-25-23:16:15 import
Igor Sysoev <igor@sysoev.ru>
parents: 267
diff changeset
207 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
7bb9562216ce nginx-0.0.2-2004-02-25-23:16:15 import
Igor Sysoev <igor@sysoev.ru>
parents: 267
diff changeset
208 "red zone address was changed");
86
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
209 }
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
210
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
211 /* create the threads errno array */
86
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
212
270
7bb9562216ce nginx-0.0.2-2004-02-25-23:16:15 import
Igor Sysoev <igor@sysoev.ru>
parents: 267
diff changeset
213 if (!(errnos = ngx_calloc(n * sizeof(int), cycle->log))) {
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
214 return NGX_ERROR;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
215 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
216
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
217 /* create the threads tid array */
86
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
218
270
7bb9562216ce nginx-0.0.2-2004-02-25-23:16:15 import
Igor Sysoev <igor@sysoev.ru>
parents: 267
diff changeset
219 if (!(tids = ngx_calloc((n + 1) * sizeof(ngx_tid_t), cycle->log))) {
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
220 return NGX_ERROR;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
221 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
222
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
223 tids[0] = ngx_pid;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
224 nthreads = 1;
84
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
225
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
226 last_stack = zone + rz_size;
86
3973260705cc nginx-0.0.1-2003-05-12-19:52:24 import
Igor Sysoev <igor@sysoev.ru>
parents: 85
diff changeset
227 usable_stack_size = size;
272
d4e65d74db9f nginx-0.0.2-2004-03-01-00:03:02 import
Igor Sysoev <igor@sysoev.ru>
parents: 271
diff changeset
228 ngx_thread_stack_size = size + rz_size;
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
229
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
230 /* allow the spinlock in libc malloc() */
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
231 __isthreaded = 1;
84
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
232
271
e16dfb9b9afa nginx-0.0.2-2004-02-26-20:10:01 import
Igor Sysoev <igor@sysoev.ru>
parents: 270
diff changeset
233 ngx_threaded = 1;
e16dfb9b9afa nginx-0.0.2-2004-02-26-20:10:01 import
Igor Sysoev <igor@sysoev.ru>
parents: 270
diff changeset
234
84
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
235 return NGX_OK;
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
236 }
3
34a521b1a148 nginx-0.0.1-2002-08-20-18:48:28 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
237
84
fab4cb00fe5b nginx-0.0.1-2003-05-06-21:03:16 import
Igor Sysoev <igor@sysoev.ru>
parents: 3
diff changeset
238
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
239 ngx_tid_t ngx_thread_self()
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
240 {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
241 int tid;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
242 ngx_tid_t pid;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
243
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
244 tid = ngx_gettid();
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
245
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
246 if (tids == NULL) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
247 return ngx_pid;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
248 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
249
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
250 #if 0
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
251 if (tids[tid] == 0) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
252 pid = ngx_pid;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
253 tids[tid] = pid;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
254 return pid;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
255 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
256 #endif
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
257
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
258 return tids[tid];
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
259 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
260
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
261
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
262 ngx_mutex_t *ngx_mutex_init(ngx_log_t *log, uint flags)
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
263 {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
264 int nsem, i;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
265 ngx_mutex_t *m;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
266 union semun op;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
267
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
268 if (!(m = ngx_alloc(sizeof(ngx_mutex_t), log))) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
269 return NULL;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
270 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
271
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
272 m->lock = 0;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
273 m->log = log;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
274
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
275 if (flags & NGX_MUTEX_LIGHT) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
276 m->semid = -1;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
277 return m;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
278 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
279
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
280 nsem = flags & NGX_MUTEX_CV ? 2 : 1;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
281
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
282 m->semid = semget(IPC_PRIVATE, nsem, SEM_R|SEM_A);
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
283 if (m->semid == -1) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
284 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, "semget() failed");
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
285 return NULL;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
286 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
287
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
288 op.val = 0;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
289 for (i = 0; i < nsem; i++) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
290 if (semctl(m->semid, i, SETVAL, op) == -1) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
291 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
292 "semctl(SETVAL) failed");
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
293
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
294 if (semctl(m->semid, 0, IPC_RMID) == -1) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
295 ngx_log_error(NGX_LOG_ALERT, m->log, ngx_errno,
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
296 "semctl(IPC_RMID) failed");
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
297 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
298
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
299 return NULL;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
300 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
301 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
302
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
303 return m;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
304 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
305
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
306
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
307 void ngx_mutex_done(ngx_mutex_t *m)
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
308 {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
309 if (semctl(m->semid, 0, IPC_RMID) == -1) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
310 ngx_log_error(NGX_LOG_ALERT, m->log, ngx_errno,
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
311 "semctl(IPC_RMID) failed");
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
312 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
313
267
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
314 ngx_free((void *) m);
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
315 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
316
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
317
272
d4e65d74db9f nginx-0.0.2-2004-03-01-00:03:02 import
Igor Sysoev <igor@sysoev.ru>
parents: 271
diff changeset
318 ngx_int_t ngx_mutex_dolock(ngx_mutex_t *m, ngx_int_t try)
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
319 {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
320 uint32_t lock, new, old;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
321 ngx_uint_t tries;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
322 struct sembuf op;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
323
271
e16dfb9b9afa nginx-0.0.2-2004-02-26-20:10:01 import
Igor Sysoev <igor@sysoev.ru>
parents: 270
diff changeset
324 if (!ngx_threaded) {
e16dfb9b9afa nginx-0.0.2-2004-02-26-20:10:01 import
Igor Sysoev <igor@sysoev.ru>
parents: 270
diff changeset
325 return NGX_OK;
e16dfb9b9afa nginx-0.0.2-2004-02-26-20:10:01 import
Igor Sysoev <igor@sysoev.ru>
parents: 270
diff changeset
326 }
e16dfb9b9afa nginx-0.0.2-2004-02-26-20:10:01 import
Igor Sysoev <igor@sysoev.ru>
parents: 270
diff changeset
327
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
328 #if (NGX_DEBUG)
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
329 if (try) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
330 ngx_log_debug2(NGX_LOG_DEBUG_CORE, m->log, 0,
267
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
331 "try lock mutex " PTR_FMT " lock:%X", m, m->lock);
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
332 } else {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
333 ngx_log_debug2(NGX_LOG_DEBUG_CORE, m->log, 0,
267
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
334 "lock mutex " PTR_FMT " lock:%X", m, m->lock);
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
335 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
336 #endif
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
337
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
338 old = m->lock;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
339 tries = 0;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
340
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
341 for ( ;; ) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
342 if (old & NGX_MUTEX_LOCK_BUSY) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
343
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
344 if (try) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
345 return NGX_AGAIN;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
346 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
347
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
348 if (ngx_freebsd_hw_ncpu > 1 && tries++ < 1000) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
349
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
350 /* the spinlock is used only on the SMP system */
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
351
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
352 old = m->lock;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
353 continue;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
354 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
355
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
356 if (m->semid == -1) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
357 sched_yield();
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
358
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
359 tries = 0;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
360 old = m->lock;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
361 continue;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
362 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
363
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
364 ngx_log_debug2(NGX_LOG_DEBUG_CORE, m->log, 0,
267
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
365 "mutex " PTR_FMT " lock:%X", m, m->lock);
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
366
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
367 /*
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
368 * The mutex is locked so we increase a number
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
369 * of the threads that are waiting on the mutex
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
370 */
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
371
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
372 lock = old + 1;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
373
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
374 if ((lock & ~NGX_MUTEX_LOCK_BUSY) > nthreads) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
375 ngx_log_error(NGX_LOG_ALERT, m->log, ngx_errno,
267
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
376 "%d threads wait for mutex " PTR_FMT
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
377 ", while only %d threads are available",
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
378 lock & ~NGX_MUTEX_LOCK_BUSY, m, nthreads);
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
379 return NGX_ERROR;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
380 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
381
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
382 if (ngx_atomic_cmp_set(&m->lock, old, lock)) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
383
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
384 ngx_log_debug2(NGX_LOG_DEBUG_CORE, m->log, 0,
267
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
385 "wait mutex " PTR_FMT " lock:%X", m, m->lock);
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
386
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
387 /*
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
388 * The number of the waiting threads has been increased
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
389 * and we would wait on the SysV semaphore.
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
390 * A semaphore should wake up us more efficiently than
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
391 * a simple usleep().
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
392 */
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
393
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
394 op.sem_num = 0;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
395 op.sem_op = -1;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
396 op.sem_flg = SEM_UNDO;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
397
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
398 if (semop(m->semid, &op, 1) == -1) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
399 ngx_log_error(NGX_LOG_ALERT, m->log, ngx_errno,
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
400 "semop() failed while waiting "
267
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
401 "on mutex " PTR_FMT, m);
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
402 return NGX_ERROR;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
403 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
404
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
405 tries = 0;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
406 old = m->lock;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
407 continue;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
408 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
409
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
410 old = m->lock;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
411
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
412 } else {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
413 lock = old | NGX_MUTEX_LOCK_BUSY;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
414
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
415 if (ngx_atomic_cmp_set(&m->lock, old, lock)) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
416
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
417 /* we locked the mutex */
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
418
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
419 break;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
420 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
421
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
422 old = m->lock;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
423 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
424
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
425 if (tries++ > 1000) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
426
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
427 ngx_log_debug1(NGX_LOG_DEBUG_CORE, m->log, 0,
267
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
428 "mutex " PTR_FMT " is contested", m);
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
429
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
430 /* the mutex is probably contested so we are giving up now */
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
431
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
432 sched_yield();
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
433
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
434 tries = 0;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
435 old = m->lock;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
436 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
437 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
438
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
439 ngx_log_debug2(NGX_LOG_DEBUG_CORE, m->log, 0,
267
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
440 "mutex " PTR_FMT " is locked, lock:%X", m, m->lock);
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
441
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
442 return NGX_OK;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
443 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
444
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
445
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
446 ngx_int_t ngx_mutex_unlock(ngx_mutex_t *m)
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
447 {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
448 uint32_t lock, new, old;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
449 struct sembuf op;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
450
271
e16dfb9b9afa nginx-0.0.2-2004-02-26-20:10:01 import
Igor Sysoev <igor@sysoev.ru>
parents: 270
diff changeset
451 if (!ngx_threaded) {
e16dfb9b9afa nginx-0.0.2-2004-02-26-20:10:01 import
Igor Sysoev <igor@sysoev.ru>
parents: 270
diff changeset
452 return NGX_OK;
e16dfb9b9afa nginx-0.0.2-2004-02-26-20:10:01 import
Igor Sysoev <igor@sysoev.ru>
parents: 270
diff changeset
453 }
e16dfb9b9afa nginx-0.0.2-2004-02-26-20:10:01 import
Igor Sysoev <igor@sysoev.ru>
parents: 270
diff changeset
454
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
455 old = m->lock;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
456
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
457 if (!(old & NGX_MUTEX_LOCK_BUSY)) {
272
d4e65d74db9f nginx-0.0.2-2004-03-01-00:03:02 import
Igor Sysoev <igor@sysoev.ru>
parents: 271
diff changeset
458 ngx_log_error(NGX_LOG_ALERT, m->log, 0,
267
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
459 "tring to unlock the free mutex " PTR_FMT, m);
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
460 return NGX_ERROR;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
461 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
462
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
463 /* free the mutex */
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
464
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
465 for ( ;; ) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
466 lock = old & ~NGX_MUTEX_LOCK_BUSY;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
467
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
468 if (ngx_atomic_cmp_set(&m->lock, old, lock)) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
469 break;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
470 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
471
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
472 old = m->lock;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
473 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
474
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
475 if (m->semid == -1) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
476 ngx_log_debug1(NGX_LOG_DEBUG_CORE, m->log, 0,
267
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
477 "mutex " PTR_FMT " is unlocked", m);
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
478
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
479 return NGX_OK;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
480 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
481
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
482 /* check weather we need to wake up a waiting thread */
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
483
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
484 old = m->lock;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
485
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
486 for ( ;; ) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
487 if (old & NGX_MUTEX_LOCK_BUSY) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
488
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
489 /* the mutex is just locked by another thread */
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
490
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
491 break;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
492 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
493
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
494 if (old == 0) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
495 break;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
496 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
497
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
498 /* there are the waiting threads */
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
499
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
500 lock = old - 1;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
501
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
502 if (ngx_atomic_cmp_set(&m->lock, old, lock)) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
503
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
504 /* wake up the thread that waits on semaphore */
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
505
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
506 op.sem_num = 0;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
507 op.sem_op = 1;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
508 op.sem_flg = SEM_UNDO;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
509
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
510 if (semop(m->semid, &op, 1) == -1) {
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
511 ngx_log_error(NGX_LOG_ALERT, m->log, ngx_errno,
267
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
512 "semop() failed while waking up on mutex "
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
513 PTR_FMT, m);
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
514 return NGX_ERROR;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
515 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
516
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
517 break;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
518 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
519
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
520 old = m->lock;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
521 }
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
522
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
523 ngx_log_debug1(NGX_LOG_DEBUG_CORE, m->log, 0,
267
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
Igor Sysoev <igor@sysoev.ru>
parents: 266
diff changeset
524 "mutex " PTR_FMT " is unlocked", m);
266
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
525
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
526 return NGX_OK;
5238e93961a1 nginx-0.0.2-2004-02-23-23:57:12 import
Igor Sysoev <igor@sysoev.ru>
parents: 208
diff changeset
527 }