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 #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