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
11 namespace base {
12 namespace internal {
13
LockImpl()14 LockImpl::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
~LockImpl()32 LockImpl::~LockImpl() {
33 int rv = pthread_mutex_destroy(&os_lock_);
34 DCHECK_EQ(rv, 0);
35 }
36
Try()37 bool LockImpl::Try() {
38 int rv = pthread_mutex_trylock(&os_lock_);
39 DCHECK(rv == 0 || rv == EBUSY);
40 return rv == 0;
41 }
42
Lock()43 void LockImpl::Lock() {
44 int rv = pthread_mutex_lock(&os_lock_);
45 DCHECK_EQ(rv, 0);
46 }
47
Unlock()48 void LockImpl::Unlock() {
49 int rv = pthread_mutex_unlock(&os_lock_);
50 DCHECK_EQ(rv, 0);
51 }
52
53 } // namespace internal
54 } // namespace base
55