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124 lines
3.4 KiB
124 lines
3.4 KiB
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Encapsulate a mutex for thread synchronization.
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*/
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#include "Mutex.h"
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#include "NfcJniUtil.h"
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#include <errno.h>
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#include <string.h>
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#include <android-base/stringprintf.h>
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#include <base/logging.h>
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using android::base::StringPrintf;
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/*******************************************************************************
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**
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** Function: Mutex
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**
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** Description: Initialize member variables.
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**
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** Returns: None.
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**
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*******************************************************************************/
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Mutex::Mutex() {
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memset(&mMutex, 0, sizeof(mMutex));
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int res = pthread_mutex_init(&mMutex, NULL);
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if (res != 0) {
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LOG(ERROR) << StringPrintf("Mutex::Mutex: fail init; error=0x%X", res);
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}
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}
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/*******************************************************************************
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**
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** Function: ~Mutex
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**
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** Description: Cleanup all resources.
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**
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** Returns: None.
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**
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*******************************************************************************/
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Mutex::~Mutex() {
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int res = pthread_mutex_destroy(&mMutex);
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if (res != 0) {
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LOG(ERROR) << StringPrintf("Mutex::~Mutex: fail destroy; error=0x%X", res);
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}
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}
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/*******************************************************************************
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**
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** Function: lock
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**
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** Description: Block the thread and try lock the mutex.
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**
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** Returns: None.
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**
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*******************************************************************************/
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void Mutex::lock() {
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int res = pthread_mutex_lock(&mMutex);
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if (res != 0) {
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LOG(ERROR) << StringPrintf("Mutex::lock: fail lock; error=0x%X", res);
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}
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}
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/*******************************************************************************
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**
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** Function: unlock
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**
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** Description: Unlock a mutex to unblock a thread.
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**
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** Returns: None.
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**
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*******************************************************************************/
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void Mutex::unlock() {
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int res = pthread_mutex_unlock(&mMutex);
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if (res != 0) {
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LOG(ERROR) << StringPrintf("Mutex::unlock: fail unlock; error=0x%X", res);
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}
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}
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/*******************************************************************************
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**
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** Function: tryLock
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**
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** Description: Try to lock the mutex.
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**
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** Returns: True if the mutex is locked.
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**
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*******************************************************************************/
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bool Mutex::tryLock() {
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int res = pthread_mutex_trylock(&mMutex);
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if ((res != 0) && (res != EBUSY)) {
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LOG(ERROR) << StringPrintf("Mutex::tryLock: error=0x%X", res);
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}
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return res == 0;
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}
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/*******************************************************************************
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**
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** Function: nativeHandle
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**
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** Description: Get the handle of the mutex.
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**
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** Returns: Handle of the mutex.
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**
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*******************************************************************************/
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pthread_mutex_t* Mutex::nativeHandle() { return &mMutex; }
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