xref: /aosp_15_r20/external/cronet/third_party/apache-portable-runtime/src/locks/os2/thread_mutex.c (revision 6777b5387eb2ff775bb5750e3f5d96f37fb7352b)
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_general.h"
18 #include "apr_lib.h"
19 #include "apr_strings.h"
20 #include "apr_portable.h"
21 #include "apr_arch_thread_mutex.h"
22 #include "apr_arch_file_io.h"
23 #include <string.h>
24 #include <stddef.h>
25 
thread_mutex_cleanup(void * themutex)26 static apr_status_t thread_mutex_cleanup(void *themutex)
27 {
28     apr_thread_mutex_t *mutex = themutex;
29     return apr_thread_mutex_destroy(mutex);
30 }
31 
32 
33 
34 /* XXX: Need to respect APR_THREAD_MUTEX_[UN]NESTED flags argument
35  *      or return APR_ENOTIMPL!!!
36  */
apr_thread_mutex_create(apr_thread_mutex_t ** mutex,unsigned int flags,apr_pool_t * pool)37 APR_DECLARE(apr_status_t) apr_thread_mutex_create(apr_thread_mutex_t **mutex,
38                                                   unsigned int flags,
39                                                   apr_pool_t *pool)
40 {
41     apr_thread_mutex_t *new_mutex;
42     ULONG rc;
43 
44     new_mutex = (apr_thread_mutex_t *)apr_palloc(pool, sizeof(apr_thread_mutex_t));
45     new_mutex->pool = pool;
46 
47     rc = DosCreateMutexSem(NULL, &(new_mutex->hMutex), 0, FALSE);
48     *mutex = new_mutex;
49 
50     if (!rc)
51         apr_pool_cleanup_register(pool, new_mutex, thread_mutex_cleanup, apr_pool_cleanup_null);
52 
53     return APR_OS2_STATUS(rc);
54 }
55 
56 
57 
apr_thread_mutex_lock(apr_thread_mutex_t * mutex)58 APR_DECLARE(apr_status_t) apr_thread_mutex_lock(apr_thread_mutex_t *mutex)
59 {
60     ULONG rc = DosRequestMutexSem(mutex->hMutex, SEM_INDEFINITE_WAIT);
61     return APR_OS2_STATUS(rc);
62 }
63 
64 
65 
apr_thread_mutex_trylock(apr_thread_mutex_t * mutex)66 APR_DECLARE(apr_status_t) apr_thread_mutex_trylock(apr_thread_mutex_t *mutex)
67 {
68     ULONG rc = DosRequestMutexSem(mutex->hMutex, SEM_IMMEDIATE_RETURN);
69     return APR_OS2_STATUS(rc);
70 }
71 
72 
73 
apr_thread_mutex_unlock(apr_thread_mutex_t * mutex)74 APR_DECLARE(apr_status_t) apr_thread_mutex_unlock(apr_thread_mutex_t *mutex)
75 {
76     ULONG rc = DosReleaseMutexSem(mutex->hMutex);
77     return APR_OS2_STATUS(rc);
78 }
79 
80 
81 
apr_thread_mutex_destroy(apr_thread_mutex_t * mutex)82 APR_DECLARE(apr_status_t) apr_thread_mutex_destroy(apr_thread_mutex_t *mutex)
83 {
84     ULONG rc;
85 
86     if (mutex->hMutex == 0)
87         return APR_SUCCESS;
88 
89     while (DosReleaseMutexSem(mutex->hMutex) == 0);
90 
91     rc = DosCloseMutexSem(mutex->hMutex);
92 
93     if (!rc) {
94         mutex->hMutex = 0;
95         return APR_SUCCESS;
96     }
97 
98     return APR_FROM_OS_ERROR(rc);
99 }
100 
101 APR_POOL_IMPLEMENT_ACCESSOR(thread_mutex)
102 
103