| /* |
| * Copyright (C) 2012 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. |
| */ |
| |
| /* |
| * Encapsulate a mutex for thread synchronization. |
| */ |
| |
| #include "Mutex.h" |
| #include "NfcJniUtil.h" |
| |
| #include <errno.h> |
| #include <string.h> |
| |
| #include <android-base/stringprintf.h> |
| #include <base/logging.h> |
| |
| using android::base::StringPrintf; |
| |
| /******************************************************************************* |
| ** |
| ** Function: Mutex |
| ** |
| ** Description: Initialize member variables. |
| ** |
| ** Returns: None. |
| ** |
| *******************************************************************************/ |
| Mutex::Mutex() { |
| memset(&mMutex, 0, sizeof(mMutex)); |
| int res = pthread_mutex_init(&mMutex, NULL); |
| if (res != 0) { |
| LOG(ERROR) << StringPrintf("Mutex::Mutex: fail init; error=0x%X", res); |
| } |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function: ~Mutex |
| ** |
| ** Description: Cleanup all resources. |
| ** |
| ** Returns: None. |
| ** |
| *******************************************************************************/ |
| Mutex::~Mutex() { |
| int res = pthread_mutex_destroy(&mMutex); |
| if (res != 0) { |
| LOG(ERROR) << StringPrintf("Mutex::~Mutex: fail destroy; error=0x%X", res); |
| } |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function: lock |
| ** |
| ** Description: Block the thread and try lock the mutex. |
| ** |
| ** Returns: None. |
| ** |
| *******************************************************************************/ |
| void Mutex::lock() { |
| int res = pthread_mutex_lock(&mMutex); |
| if (res != 0) { |
| LOG(ERROR) << StringPrintf("Mutex::lock: fail lock; error=0x%X", res); |
| } |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function: unlock |
| ** |
| ** Description: Unlock a mutex to unblock a thread. |
| ** |
| ** Returns: None. |
| ** |
| *******************************************************************************/ |
| void Mutex::unlock() { |
| int res = pthread_mutex_unlock(&mMutex); |
| if (res != 0) { |
| LOG(ERROR) << StringPrintf("Mutex::unlock: fail unlock; error=0x%X", res); |
| } |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function: tryLock |
| ** |
| ** Description: Try to lock the mutex. |
| ** |
| ** Returns: True if the mutex is locked. |
| ** |
| *******************************************************************************/ |
| bool Mutex::tryLock() { |
| int res = pthread_mutex_trylock(&mMutex); |
| if ((res != 0) && (res != EBUSY)) { |
| LOG(ERROR) << StringPrintf("Mutex::tryLock: error=0x%X", res); |
| } |
| return res == 0; |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function: nativeHandle |
| ** |
| ** Description: Get the handle of the mutex. |
| ** |
| ** Returns: Handle of the mutex. |
| ** |
| *******************************************************************************/ |
| pthread_mutex_t* Mutex::nativeHandle() { return &mMutex; } |