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thread.cc
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thread.cc
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//***************************************************************************
// File thread.cc
// Date 24.07.17 - #1
// Copyright (c) 2017-2017 s710 (s710 (at) posteo (dot) de). All rights reserved.
// --------------------------------------------------------------------------
// Ark ClusterChat / Thread class
//***************************************************************************
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <sys/time.h>
#include <string.h>
#include <stdio.h>
#include "thread.hpp"
//***************************************************************************
// Absolut Time
//***************************************************************************
static void absTime(timespec* abstime, int milli)
{
timeval now;
gettimeofday(&now, 0);
unsigned long long usec = now.tv_usec + (milli % 1000) * 1000;
abstime->tv_nsec = (usec % 1000000) * 1000;
abstime->tv_sec = now.tv_sec + (milli / 1000) + (usec / 1000000);
}
//***************************************************************************
// Mutex
//***************************************************************************
Mutex::Mutex()
{
locked = 0;
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
pthread_mutex_init(&mutex, &attr);
}
Mutex::~Mutex()
{
pthread_mutex_destroy(&mutex);
}
void Mutex::lock()
{
pthread_mutex_lock(&mutex);
locked++;
}
int Mutex::tryLock()
{
if (pthread_mutex_trylock(&mutex) == EBUSY)
return fail;
else
locked++;
return success;
}
void Mutex::unlock()
{
locked--;
if (locked <= 0)
{
locked = 0;
pthread_mutex_unlock(&mutex);
}
}
//***************************************************************************
// CondVar
//***************************************************************************
CondVar::CondVar()
{
pthread_cond_init(&cond, 0);
}
CondVar::~CondVar()
{
pthread_cond_broadcast(&cond);
pthread_cond_destroy(&cond);
}
void CondVar::wait(Mutex& mutex)
{
if (!mutex.locked)
return;
int locked = mutex.locked;
mutex.locked = 0;
pthread_cond_wait(&cond, &mutex.mutex);
mutex.locked = locked;
}
int CondVar::timedWait(Mutex& mutex, int timeout)
{
return timedWaitMs(mutex, timeout * 1000);
}
int CondVar::timedWaitMs(Mutex& mutex, int timeoutMs)
{
int r = yes;
// yes - condition signaled
// no - timeout
if (mutex.locked)
{
timespec abstime;
absTime(&abstime, timeoutMs);
int locked = mutex.locked;
mutex.locked = 0;
if (pthread_cond_timedwait(&cond, &mutex.mutex, &abstime) == ETIMEDOUT)
r = no;
mutex.locked = locked;
}
return r;
}
void CondVar::broadcast()
{
pthread_cond_broadcast(&cond);
}
//***************************************************************************
// Class Thread - Thread base class
//***************************************************************************
//***************************************************************************
// Ctor/Dtor
//***************************************************************************
Thread::Thread()
{
exitStatus = 0;
childTid = 0;
state = isUnknown;
joined = no;
pthread_attr_init(&attr);
}
Thread::~Thread()
{
// join thread in case it was not joined yet.
stop();
pthread_attr_destroy(&attr);
}
//***************************************************************************
// Start
//***************************************************************************
int Thread::start(int blockTimeout)
{
int res = success;
if (isState(isRunning))
return errAlreadyRunning;
if (!joined && childTid)
pthread_join(childTid, 0);
if (blockTimeout != na)
{
// mutex is now locked by parent thread!
controlMutex.lock();
}
setState(isRunning);
joined = no;
res = pthread_create(&childTid, 0, (void*(*)(void*))&startThread, (void *)this);
if (res != success)
{
printf("Error: Can't start thread, errno (%d) - '%s'!\n", errno, strerror(errno));
setState(isStopped);
return res;
}
if (blockTimeout != na)
return waitForStarted(blockTimeout);
return success;
}
//***************************************************************************
// Start Thread
//***************************************************************************
void* Thread::startThread(Thread* thread)
{
thread->setState(isRunning);
thread->exitStatus = success;
thread->exitStatus += thread->init();
// probably wake up mainthread, waiting in ::waitForStarted()
thread->controlMutex.lock();
thread->controlCondVar.broadcast();
thread->controlMutex.unlock();
// start mainloop, if no problems occurred
if (!thread->exitStatus)
thread->exitStatus += thread->run();
thread->exitStatus += thread->exit();
thread->setState(isStopped);
return 0;
}
//***************************************************************************
// wait for started
//***************************************************************************
int Thread::waitForStarted(int timeout)
{
// sleep on condVar. will timeout or be broadcasted by thread
controlCondVar.timedWaitMs(controlMutex, timeout * 1000);
controlMutex.unlock();
return exitStatus;
}
//***************************************************************************
// Stop
//***************************************************************************
int Thread::stop(CondVar* condVar)
{
int res= success;
setState(isExit);
if (condVar)
condVar->broadcast();
if (childTid)
res= pthread_join(childTid, 0);
childTid = 0;
setState(isExit);
joined= yes;
return res;
}