michael@0: // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #include "base/lock_impl.h"
michael@0: 
michael@0: #include <errno.h>
michael@0: 
michael@0: #include "base/logging.h"
michael@0: 
michael@0: LockImpl::LockImpl() {
michael@0: #ifndef NDEBUG
michael@0:   // In debug, setup attributes for lock error checking.
michael@0:   pthread_mutexattr_t mta;
michael@0:   int rv = pthread_mutexattr_init(&mta);
michael@0:   DCHECK_EQ(rv, 0);
michael@0:   rv = pthread_mutexattr_settype(&mta, PTHREAD_MUTEX_ERRORCHECK);
michael@0:   DCHECK_EQ(rv, 0);
michael@0:   rv = pthread_mutex_init(&os_lock_, &mta);
michael@0:   DCHECK_EQ(rv, 0);
michael@0:   rv = pthread_mutexattr_destroy(&mta);
michael@0:   DCHECK_EQ(rv, 0);
michael@0: #else
michael@0:   // In release, go with the default lock attributes.
michael@0:   pthread_mutex_init(&os_lock_, NULL);
michael@0: #endif
michael@0: }
michael@0: 
michael@0: LockImpl::~LockImpl() {
michael@0:   int rv = pthread_mutex_destroy(&os_lock_);
michael@0:   DCHECK_EQ(rv, 0);
michael@0: }
michael@0: 
michael@0: bool LockImpl::Try() {
michael@0:   int rv = pthread_mutex_trylock(&os_lock_);
michael@0:   DCHECK(rv == 0 || rv == EBUSY);
michael@0:   return rv == 0;
michael@0: }
michael@0: 
michael@0: void LockImpl::Lock() {
michael@0:   int rv = pthread_mutex_lock(&os_lock_);
michael@0:   DCHECK_EQ(rv, 0);
michael@0: }
michael@0: 
michael@0: void LockImpl::Unlock() {
michael@0:   int rv = pthread_mutex_unlock(&os_lock_);
michael@0:   DCHECK_EQ(rv, 0);
michael@0: }