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/*****************************************************************************
**
** Name: Mutex.cpp
**
** Description: Encapsulate a mutex for thread synchronization.
**
** Copyright (c) 2012, Broadcom Corp., All Rights Reserved.
** Proprietary and confidential.
**
*****************************************************************************/
#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::lock: 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::lock: fail try-lock; 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;
}
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