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 #include <string.h>
9
10 #include "base/logging.h"
11
12 namespace base {
13 namespace internal {
14
LockImpl()15 LockImpl::LockImpl() {
16 #ifndef NDEBUG
17 // In debug, setup attributes for lock error checking.
18 pthread_mutexattr_t mta;
19 int rv = pthread_mutexattr_init(&mta);
20 DCHECK_EQ(rv, 0) << ". " << strerror(rv);
21 rv = pthread_mutexattr_settype(&mta, PTHREAD_MUTEX_ERRORCHECK);
22 DCHECK_EQ(rv, 0) << ". " << strerror(rv);
23 rv = pthread_mutex_init(&native_handle_, &mta);
24 DCHECK_EQ(rv, 0) << ". " << strerror(rv);
25 rv = pthread_mutexattr_destroy(&mta);
26 DCHECK_EQ(rv, 0) << ". " << strerror(rv);
27 #else
28 // In release, go with the default lock attributes.
29 pthread_mutex_init(&native_handle_, NULL);
30 #endif
31 }
32
~LockImpl()33 LockImpl::~LockImpl() {
34 int rv = pthread_mutex_destroy(&native_handle_);
35 DCHECK_EQ(rv, 0) << ". " << strerror(rv);
36 }
37
Try()38 bool LockImpl::Try() {
39 int rv = pthread_mutex_trylock(&native_handle_);
40 DCHECK(rv == 0 || rv == EBUSY) << ". " << strerror(rv);
41 return rv == 0;
42 }
43
Lock()44 void LockImpl::Lock() {
45 int rv = pthread_mutex_lock(&native_handle_);
46 DCHECK_EQ(rv, 0) << ". " << strerror(rv);
47 }
48
Unlock()49 void LockImpl::Unlock() {
50 int rv = pthread_mutex_unlock(&native_handle_);
51 DCHECK_EQ(rv, 0) << ". " << strerror(rv);
52 }
53
54 } // namespace internal
55 } // namespace base
56