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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