base/synchronization/lock_impl_posix.cc

   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