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 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.

 // Use of this source code is governed by a BSD-style license that can be

 // found in the LICENSE file.

 #include "base/lock_impl.h"

 #include <errno.h>

 #include "base/logging.h"

 LockImpl::LockImpl() {

 #ifndef NDEBUG

   // In debug, setup attributes for lock error checking.

   pthread_mutexattr_t mta;

   int rv = pthread_mutexattr_init(&mta);

   DCHECK_EQ(rv, 0);

   rv = pthread_mutexattr_settype(&mta, PTHREAD_MUTEX_ERRORCHECK);

   DCHECK_EQ(rv, 0);

   rv = pthread_mutex_init(&os_lock_, &mta);

   DCHECK_EQ(rv, 0);

   rv = pthread_mutexattr_destroy(&mta);

   DCHECK_EQ(rv, 0);

 #else

   // In release, go with the default lock attributes.

   pthread_mutex_init(&os_lock_, NULL);

 #endif

 }

 LockImpl::~LockImpl() {

   int rv = pthread_mutex_destroy(&os_lock_);

   DCHECK_EQ(rv, 0);

 }

 bool LockImpl::Try() {

   int rv = pthread_mutex_trylock(&os_lock_);

   DCHECK(rv == 0 || rv == EBUSY);

   return rv == 0;

 }

 void LockImpl::Lock() {

   int rv = pthread_mutex_lock(&os_lock_);

   DCHECK_EQ(rv, 0);

 }

 void LockImpl::Unlock() {

   int rv = pthread_mutex_unlock(&os_lock_);

   DCHECK_EQ(rv, 0);

 }