ppapi/utility/threading/lock.cc

   1 // Copyright (c) 2012 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 "ppapi/utility/threading/lock.h"
   6
   7 namespace pp {
   8
   9 #ifdef WIN32  // Windows implementation for native plugins.
  10
  11 Lock::Lock() {
  12   // The second parameter is the spin count; for short-held locks it avoids the
  13   // contending thread from going to sleep which helps performance greatly.
  14   ::InitializeCriticalSectionAndSpinCount(&os_lock_, 2000);
  15 }
  16
  17 Lock::~Lock() {
  18   ::DeleteCriticalSection(&os_lock_);
  19 }
  20
  21 void Lock::Acquire() {
  22   ::EnterCriticalSection(&os_lock_);
  23 }
  24
  25 void Lock::Release() {
  26   ::LeaveCriticalSection(&os_lock_);
  27 }
  28
  29 #else  // Posix implementation.
  30
  31 Lock::Lock() {
  32   pthread_mutex_init(&os_lock_, NULL);
  33 }
  34
  35 Lock::~Lock() {
  36   pthread_mutex_destroy(&os_lock_);
  37 }
  38
  39 void Lock::Acquire() {
  40   pthread_mutex_lock(&os_lock_);
  41 }
  42
  43 void Lock::Release() {
  44   pthread_mutex_unlock(&os_lock_);
  45 }
  46
  47 #endif
  48
  49 }  // namespace pp