blob: c0b12c00da4a22d25868e37c288f9dad16f1795f [file] [log] [blame]
/*
* 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>
/*******************************************************************************
**
** 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)
{
ALOGE ("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)
{
ALOGE ("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)
{
ALOGE ("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)
{
ALOGE ("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))
{
ALOGE ("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;
}