/* * 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 and std::mutex when this code no longer needs // to compile for pre-C++11... #include #if !defined(_WIN32) #include #else #include #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