149 lines
4.3 KiB
C++
149 lines
4.3 KiB
C++
/******************************************************************************
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*
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* Copyright (C) 2012 Broadcom Corporation
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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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/******************************************************************************
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*
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* Encapsulate a condition variable for thread synchronization.
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*
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******************************************************************************/
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#define LOG_TAG "NfcNciHal"
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#include "OverrideLog.h"
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#include "CondVar.h"
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#include <errno.h>
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#include <string.h>
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/*******************************************************************************
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**
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** Function: CondVar
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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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CondVar::CondVar ()
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{
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pthread_condattr_t attr;
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pthread_condattr_init(&attr);
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pthread_condattr_setclock(&attr, CLOCK_MONOTONIC);
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memset (&mCondition, 0, sizeof(mCondition));
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int const res = pthread_cond_init (&mCondition, &attr);
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if (res)
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{
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ALOGE ("CondVar::CondVar: 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: ~CondVar
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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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CondVar::~CondVar ()
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{
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int const res = pthread_cond_destroy (&mCondition);
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if (res)
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{
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ALOGE ("CondVar::~CondVar: 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: wait
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**
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** Description: Block the caller and wait for a condition.
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**
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** Returns: None.
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**
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*******************************************************************************/
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void CondVar::wait (Mutex& mutex)
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{
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int const res = pthread_cond_wait (&mCondition, mutex.nativeHandle());
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if (res)
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{
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ALOGE ("CondVar::wait: fail wait; 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: wait
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**
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** Description: Block the caller and wait for a condition.
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** millisec: Timeout in milliseconds.
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**
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** Returns: True if wait is successful; false if timeout occurs.
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**
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*******************************************************************************/
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bool CondVar::wait (Mutex& mutex, long millisec)
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{
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bool retVal = false;
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struct timespec absoluteTime;
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if (clock_gettime (CLOCK_MONOTONIC, &absoluteTime) == -1)
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{
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ALOGE ("CondVar::wait: fail get time; errno=0x%X", errno);
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}
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else
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{
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absoluteTime.tv_sec += millisec / 1000;
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long ns = absoluteTime.tv_nsec + ((millisec % 1000) * 1000000);
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if (ns > 1000000000)
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{
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absoluteTime.tv_sec++;
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absoluteTime.tv_nsec = ns - 1000000000;
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}
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else
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absoluteTime.tv_nsec = ns;
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}
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int waitResult = pthread_cond_timedwait (&mCondition, mutex.nativeHandle(), &absoluteTime);
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if ((waitResult != 0) && (waitResult != ETIMEDOUT))
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ALOGE ("CondVar::wait: fail timed wait; error=0x%X", waitResult);
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retVal = (waitResult == 0); //waited successfully
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return retVal;
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}
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/*******************************************************************************
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**
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** Function: notifyOne
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**
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** Description: Unblock the waiting thread.
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**
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** Returns: None.
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**
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*******************************************************************************/
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void CondVar::notifyOne ()
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{
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int const res = pthread_cond_signal (&mCondition);
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if (res)
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{
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ALOGE ("CondVar::notifyOne: fail signal; error=0x%X", res);
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}
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}
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