Revert the latest set of platform changes.

src/mutex.cc

-// Copyright 2013 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-//       notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-//       copyright notice, this list of conditions and the following
-//       disclaimer in the documentation and/or other materials provided
-//       with the distribution.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "mutex.h"
-
-#include <errno.h>
-
-#include "checks.h"
-
-namespace v8 {
-namespace internal {
-
-#if V8_OS_UNIX
-
-Mutex::Mutex() {
-  pthread_mutexattr_t attr;
-  int result = pthread_mutexattr_init(&attr);
-  ASSERT_EQ(0, result);
-  result = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
-  ASSERT_EQ(0, result);
-  result = pthread_mutex_init(&mutex_, &attr);
-  ASSERT_EQ(0, result);
-  result = pthread_mutexattr_destroy(&attr);
-  ASSERT_EQ(0, result);
-  USE(result);
-}
-
-
-Mutex::~Mutex() {
-  pthread_mutex_destroy(&mutex_);
-}
-
-
-void Mutex::Lock() {
-  int result = pthread_mutex_lock(&mutex_);
-  ASSERT_EQ(0, result);
-  USE(result);
-}
-
-
-void Mutex::Unlock() {
-  int result = pthread_mutex_unlock(&mutex_);
-  ASSERT_EQ(0, result);
-  USE(result);
-}
-
-
-bool Mutex::TryLock() {
-  int result = pthread_mutex_trylock(&mutex_);
-  // Return false if the lock is busy and locking failed.
-  if (result == EBUSY) {
-    return false;
-  }
-  ASSERT_EQ(0, result);
-  return true;
-}
-
-#elif V8_OS_WIN32
-
-Mutex::Mutex() {
-  InitializeCriticalSection(&cs_);
-}
-
-
-Mutex::~Mutex() {
-  DeleteCriticalSection(&cs_);
-}
-
-
-void Mutex::Lock() {
-  EnterCriticalSection(&cs_);
-}
-
-
-void Mutex::Unlock() {
-  LeaveCriticalSection(&cs_);
-}
-
-
-bool Mutex::TryLock() {
-  return TryEnterCriticalSection(&cs_);
-}
-
-#endif  // V8_OS_WIN32
-
-} }  // namespace v8::internal