130d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun/* 230d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun * Copyright 2011 Google Inc. All Rights Reserved. 330d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun * 430d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun * Licensed under the Apache License, Version 2.0 (the "License"); 530d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun * you may not use this file except in compliance with the License. 630d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun * You may obtain a copy of the License at 730d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun * 830d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun * http://www.apache.org/licenses/LICENSE-2.0 930d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun * 1030d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun * Unless required by applicable law or agreed to in writing, software 1130d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun * distributed under the License is distributed on an "AS IS" BASIS, 1230d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1330d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun * See the License for the specific language governing permissions and 1430d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun * limitations under the License. 1530d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun */ 1630d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun 1730d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun#include "sfntly/port/lock.h" 1830d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun 1930d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurunnamespace sfntly { 2030d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun 2130d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun#if defined (WIN32) 2230d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun 2330d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim GurunLock::Lock() { 2430d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun // The second parameter is the spin count, for short-held locks it avoid the 2530d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun // contending thread from going to sleep which helps performance greatly. 2630d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun ::InitializeCriticalSectionAndSpinCount(&os_lock_, 2000); 2730d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun} 2830d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun 2930d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim GurunLock::~Lock() { 3030d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun ::DeleteCriticalSection(&os_lock_); 3130d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun} 3230d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun 3330d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurunbool Lock::Try() { 3430d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun if (::TryEnterCriticalSection(&os_lock_) != FALSE) { 3530d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun return true; 3630d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun } 3730d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun return false; 3830d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun} 3930d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun 4030d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurunvoid Lock::Acquire() { 4130d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun ::EnterCriticalSection(&os_lock_); 4230d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun} 4330d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun 4430d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurunvoid Lock::Unlock() { 4530d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun ::LeaveCriticalSection(&os_lock_); 4630d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun} 4730d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun 4830d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun#else // We assume it's pthread 4930d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun 5030d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim GurunLock::Lock() { 5130d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun pthread_mutex_init(&os_lock_, NULL); 5230d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun} 5330d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun 5430d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim GurunLock::~Lock() { 5530d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun pthread_mutex_destroy(&os_lock_); 5630d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun} 5730d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun 5830d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurunbool Lock::Try() { 5930d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun return (pthread_mutex_trylock(&os_lock_) == 0); 6030d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun} 6130d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun 6230d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurunvoid Lock::Acquire() { 6330d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun pthread_mutex_lock(&os_lock_); 6430d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun} 6530d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun 6630d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurunvoid Lock::Unlock() { 6730d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun pthread_mutex_unlock(&os_lock_); 6830d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun} 6930d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun 7030d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun#endif 7130d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun 7230d4e1f3d81ad9f7a1aa14ce6d2ceb5df56c15cdSelim Gurun} // namespace sfntly 73