lock_impl_posix.cc revision 5821806d5e7f356e8fa4b058a389a808ea183019 
1// Copyright (c) 2011 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "base/synchronization/lock_impl.h"
6
7#include <errno.h>
8
9#include "base/logging.h"
10
11namespace base {
12namespace internal {
13
14LockImpl::LockImpl() {
15#ifndef NDEBUG
16  // In debug, setup attributes for lock error checking.
17  pthread_mutexattr_t mta;
18  int rv = pthread_mutexattr_init(&mta);
19  DCHECK_EQ(rv, 0);
20  rv = pthread_mutexattr_settype(&mta, PTHREAD_MUTEX_ERRORCHECK);
21  DCHECK_EQ(rv, 0);
22  rv = pthread_mutex_init(&os_lock_, &mta);
23  DCHECK_EQ(rv, 0);
24  rv = pthread_mutexattr_destroy(&mta);
25  DCHECK_EQ(rv, 0);
26#else
27  // In release, go with the default lock attributes.
28  pthread_mutex_init(&os_lock_, NULL);
29#endif
30}
31
32LockImpl::~LockImpl() {
33  int rv = pthread_mutex_destroy(&os_lock_);
34  DCHECK_EQ(rv, 0);
35}
36
37bool LockImpl::Try() {
38  int rv = pthread_mutex_trylock(&os_lock_);
39  DCHECK(rv == 0 || rv == EBUSY);
40  return rv == 0;
41}
42
43void LockImpl::Lock() {
44  int rv = pthread_mutex_lock(&os_lock_);
45  DCHECK_EQ(rv, 0);
46}
47
48void LockImpl::Unlock() {
49  int rv = pthread_mutex_unlock(&os_lock_);
50  DCHECK_EQ(rv, 0);
51}
52
53}  // namespace internal
54}  // namespace base
55