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