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/*
* 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
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