| /* |
| * Copyright 2011 Google Inc. All Rights Reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "sfntly/port/lock.h" |
| |
| namespace sfntly { |
| |
| #if defined (WIN32) |
| |
| Lock::Lock() { |
| // The second parameter is the spin count, for short-held locks it avoid the |
| // contending thread from going to sleep which helps performance greatly. |
| ::InitializeCriticalSectionAndSpinCount(&os_lock_, 2000); |
| } |
| |
| Lock::~Lock() { |
| ::DeleteCriticalSection(&os_lock_); |
| } |
| |
| bool Lock::Try() { |
| if (::TryEnterCriticalSection(&os_lock_) != FALSE) { |
| return true; |
| } |
| return false; |
| } |
| |
| void Lock::Acquire() { |
| ::EnterCriticalSection(&os_lock_); |
| } |
| |
| void Lock::Unlock() { |
| ::LeaveCriticalSection(&os_lock_); |
| } |
| |
| #else // We assume it's pthread |
| |
| Lock::Lock() { |
| pthread_mutex_init(&os_lock_, NULL); |
| } |
| |
| Lock::~Lock() { |
| pthread_mutex_destroy(&os_lock_); |
| } |
| |
| bool Lock::Try() { |
| return (pthread_mutex_trylock(&os_lock_) == 0); |
| } |
| |
| void Lock::Acquire() { |
| pthread_mutex_lock(&os_lock_); |
| } |
| |
| void Lock::Unlock() { |
| pthread_mutex_unlock(&os_lock_); |
| } |
| |
| #endif |
| |
| } // namespace sfntly |