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 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 32 LockImpl::~LockImpl() { 33 int rv = pthread_mutex_destroy(&os_lock_); 34 DCHECK_EQ(rv, 0); 35 } 36 37 bool LockImpl::Try() { 38 int rv = pthread_mutex_trylock(&os_lock_); 39 DCHECK(rv == 0 || rv == EBUSY); 40 return rv == 0; 41 } 42 43 void LockImpl::Lock() { 44 int rv = pthread_mutex_lock(&os_lock_); 45 DCHECK_EQ(rv, 0); 46 } 47 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
