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Member "apr-1.7.0/locks/win32/thread_mutex.c" (21 Mar 2019, 5798 Bytes) of package /linux/www/apr-1.7.0.tar.bz2:
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1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "apr.h"
18 #include "apr_private.h"
19 #include "apr_general.h"
20 #include "apr_strings.h"
21 #include "apr_arch_thread_mutex.h"
22 #include "apr_thread_mutex.h"
23 #include "apr_portable.h"
24 #include "apr_arch_misc.h"
25
26 static apr_status_t thread_mutex_cleanup(void *data)
27 {
28 apr_thread_mutex_t *lock = data;
29
30 if (lock->type == thread_mutex_critical_section) {
31 lock->type = -1;
32 DeleteCriticalSection(&lock->section);
33 }
34 else {
35 if (!CloseHandle(lock->handle)) {
36 return apr_get_os_error();
37 }
38 }
39 return APR_SUCCESS;
40 }
41
42 APR_DECLARE(apr_status_t) apr_thread_mutex_create(apr_thread_mutex_t **mutex,
43 unsigned int flags,
44 apr_pool_t *pool)
45 {
46 (*mutex) = (apr_thread_mutex_t *)apr_palloc(pool, sizeof(**mutex));
47
48 (*mutex)->pool = pool;
49
50 if (flags & APR_THREAD_MUTEX_UNNESTED) {
51 /* Use an auto-reset signaled event, ready to accept one
52 * waiting thread.
53 */
54 (*mutex)->type = thread_mutex_unnested_event;
55 (*mutex)->handle = CreateEvent(NULL, FALSE, TRUE, NULL);
56 }
57 else if (flags & APR_THREAD_MUTEX_TIMED) {
58 (*mutex)->type = thread_mutex_nested_mutex;
59 (*mutex)->handle = CreateMutex(NULL, FALSE, NULL);
60 }
61 else {
62 #if APR_HAS_UNICODE_FS
63 /* Critical Sections are terrific, performance-wise, on NT.
64 * On Win9x, we cannot 'try' on a critical section, so we
65 * use a [slower] mutex object, instead.
66 */
67 IF_WIN_OS_IS_UNICODE {
68 InitializeCriticalSection(&(*mutex)->section);
69 (*mutex)->type = thread_mutex_critical_section;
70 (*mutex)->handle = NULL;
71 }
72 #endif
73 #if APR_HAS_ANSI_FS
74 ELSE_WIN_OS_IS_ANSI {
75 (*mutex)->type = thread_mutex_nested_mutex;
76 (*mutex)->handle = CreateMutex(NULL, FALSE, NULL);
77
78 }
79 #endif
80 }
81
82 apr_pool_cleanup_register((*mutex)->pool, (*mutex), thread_mutex_cleanup,
83 apr_pool_cleanup_null);
84 return APR_SUCCESS;
85 }
86
87 APR_DECLARE(apr_status_t) apr_thread_mutex_lock(apr_thread_mutex_t *mutex)
88 {
89 if (mutex->type == thread_mutex_critical_section) {
90 EnterCriticalSection(&mutex->section);
91 }
92 else {
93 DWORD rv = WaitForSingleObject(mutex->handle, INFINITE);
94 if ((rv != WAIT_OBJECT_0) && (rv != WAIT_ABANDONED)) {
95 return (rv == WAIT_TIMEOUT) ? APR_EBUSY : apr_get_os_error();
96 }
97 }
98 return APR_SUCCESS;
99 }
100
101 APR_DECLARE(apr_status_t) apr_thread_mutex_trylock(apr_thread_mutex_t *mutex)
102 {
103 if (mutex->type == thread_mutex_critical_section) {
104 if (!TryEnterCriticalSection(&mutex->section)) {
105 return APR_EBUSY;
106 }
107 }
108 else {
109 DWORD rv = WaitForSingleObject(mutex->handle, 0);
110 if ((rv != WAIT_OBJECT_0) && (rv != WAIT_ABANDONED)) {
111 return (rv == WAIT_TIMEOUT) ? APR_EBUSY : apr_get_os_error();
112 }
113 }
114 return APR_SUCCESS;
115 }
116
117 APR_DECLARE(apr_status_t) apr_thread_mutex_timedlock(apr_thread_mutex_t *mutex,
118 apr_interval_time_t timeout)
119 {
120 if (mutex->type != thread_mutex_critical_section) {
121 DWORD rv, timeout_ms = 0;
122 apr_interval_time_t t = timeout;
123
124 do {
125 if (t > 0) {
126 /* Given timeout is 64bit usecs whereas Windows timeouts are
127 * 32bit msecs and below INFINITE (2^32 - 1), so we may need
128 * multiple timed out waits...
129 */
130 if (t > apr_time_from_msec(INFINITE - 1)) {
131 timeout_ms = INFINITE - 1;
132 t -= apr_time_from_msec(INFINITE - 1);
133 }
134 else {
135 timeout_ms = (DWORD)apr_time_as_msec(t);
136 t = 0;
137 }
138 }
139 rv = WaitForSingleObject(mutex->handle, timeout_ms);
140 } while (rv == WAIT_TIMEOUT && t > 0);
141
142 if ((rv != WAIT_OBJECT_0) && (rv != WAIT_ABANDONED)) {
143 return (rv == WAIT_TIMEOUT) ? APR_TIMEUP : apr_get_os_error();
144 }
145 return APR_SUCCESS;
146 }
147
148 return APR_ENOTIMPL;
149 }
150
151 APR_DECLARE(apr_status_t) apr_thread_mutex_unlock(apr_thread_mutex_t *mutex)
152 {
153 if (mutex->type == thread_mutex_critical_section) {
154 LeaveCriticalSection(&mutex->section);
155 }
156 else if (mutex->type == thread_mutex_unnested_event) {
157 if (!SetEvent(mutex->handle)) {
158 return apr_get_os_error();
159 }
160 }
161 else if (mutex->type == thread_mutex_nested_mutex) {
162 if (!ReleaseMutex(mutex->handle)) {
163 return apr_get_os_error();
164 }
165 }
166 return APR_SUCCESS;
167 }
168
169 APR_DECLARE(apr_status_t) apr_thread_mutex_destroy(apr_thread_mutex_t *mutex)
170 {
171 return apr_pool_cleanup_run(mutex->pool, mutex, thread_mutex_cleanup);
172 }
173
174 APR_POOL_IMPLEMENT_ACCESSOR(thread_mutex)
175