1 // Copyright (c) 2006-2008 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/lock_impl.h" 6 7 #include <errno.h> 8 9 #include "base/logging.h" 10 11 LockImpl::LockImpl() { 12 #ifndef NDEBUG 13 // In debug, setup attributes for lock error checking. 14 pthread_mutexattr_t mta; 15 int rv = pthread_mutexattr_init(&mta); 16 DCHECK_EQ(rv, 0); 17 rv = pthread_mutexattr_settype(&mta, PTHREAD_MUTEX_ERRORCHECK); 18 DCHECK_EQ(rv, 0); 19 rv = pthread_mutex_init(&os_lock_, &mta); 20 DCHECK_EQ(rv, 0); 21 rv = pthread_mutexattr_destroy(&mta); 22 DCHECK_EQ(rv, 0); 23 #else 24 // In release, go with the default lock attributes. 25 pthread_mutex_init(&os_lock_, NULL); 26 #endif 27 } 28 29 LockImpl::~LockImpl() { 30 int rv = pthread_mutex_destroy(&os_lock_); 31 DCHECK_EQ(rv, 0); 32 } 33 34 bool LockImpl::Try() { 35 int rv = pthread_mutex_trylock(&os_lock_); 36 DCHECK(rv == 0 || rv == EBUSY); 37 return rv == 0; 38 } 39 40 void LockImpl::Lock() { 41 int rv = pthread_mutex_lock(&os_lock_); 42 DCHECK_EQ(rv, 0); 43 } 44 45 void LockImpl::Unlock() { 46 int rv = pthread_mutex_unlock(&os_lock_); 47 DCHECK_EQ(rv, 0); 48 } 49
