1/*
2 * Copyright (C) 2007-2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * 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/*
18 * Some OS specific dribs and drabs (locking etc).
19 */
20
21#if !defined(_WIN32)
22#include <pthread.h>
23#endif
24
25#include "logger.h"
26
27#if !defined(_WIN32)
28static pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER;
29#endif
30
31LIBLOG_HIDDEN void __android_log_lock() {
32#if !defined(_WIN32)
33  /*
34   * If we trigger a signal handler in the middle of locked activity and the
35   * signal handler logs a message, we could get into a deadlock state.
36   */
37  pthread_mutex_lock(&log_init_lock);
38#endif
39}
40
41LIBLOG_HIDDEN int __android_log_trylock() {
42#if !defined(_WIN32)
43  return pthread_mutex_trylock(&log_init_lock);
44#else
45  return 0;
46#endif
47}
48
49LIBLOG_HIDDEN void __android_log_unlock() {
50#if !defined(_WIN32)
51  pthread_mutex_unlock(&log_init_lock);
52#endif
53}
54