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/*
* Copyright (C) 2007 The Android Open Source Project
*
* 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.
*/
#pragma once
// TODO: switch to <mutex> and std::mutex when this code no longer needs
// to compile for pre-C++11...
#include <sys/types.h>
#if !defined(_WIN32)
#include <pthread.h>
#else
#include <windows.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
#if !defined(_WIN32)
typedef pthread_mutex_t mutex_t;
static __inline__ void mutex_lock(mutex_t* lock) {
pthread_mutex_lock(lock);
}
static __inline__ void mutex_unlock(mutex_t* lock) {
pthread_mutex_unlock(lock);
}
static __inline__ int mutex_init(mutex_t* lock) {
return pthread_mutex_init(lock, NULL);
}
static __inline__ void mutex_destroy(mutex_t* lock) {
pthread_mutex_destroy(lock);
}
#else // !defined(_WIN32)
typedef struct {
int init;
CRITICAL_SECTION lock[1];
} mutex_t;
#define MUTEX_INITIALIZER { 0, {{ NULL, 0, 0, NULL, NULL, 0 }} }
static __inline__ void mutex_lock(mutex_t* lock) {
if (!lock->init) {
lock->init = 1;
InitializeCriticalSection( lock->lock );
lock->init = 2;
} else while (lock->init != 2) {
Sleep(10);
}
EnterCriticalSection(lock->lock);
}
static __inline__ void mutex_unlock(mutex_t* lock) {
LeaveCriticalSection(lock->lock);
}
static __inline__ int mutex_init(mutex_t* lock) {
InitializeCriticalSection(lock->lock);
lock->init = 2;
return 0;
}
static __inline__ void mutex_destroy(mutex_t* lock) {
if (lock->init) {
lock->init = 0;
DeleteCriticalSection(lock->lock);
}
}
#endif // !defined(_WIN32)
#ifdef __cplusplus
}
#endif
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