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 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 33 LockImpl::~LockImpl() { 34 int rv = pthread_mutex_destroy(&native_handle_); 35 DCHECK_EQ(rv, 0) << ". " << strerror(rv); 36 } 37 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 44 void LockImpl::Lock() { 45 int rv = pthread_mutex_lock(&native_handle_); 46 DCHECK_EQ(rv, 0) << ". " << strerror(rv); 47 } 48 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
