thread_posix.cpp

This software aims to create an applet and panel tools to manage a wireless interface card, such as

//
// Thread_POSIX.cpp
//
// $Id: //poco/Main/Foundation/src/Thread_POSIX.cpp#5 $
//
// Copyright (c) 2004, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//


#include "Foundation/Thread_POSIX.h"
#include "Foundation/Exception.h"
#include <signal.h>


Foundation_BEGIN


pthread_key_t ThreadImp::_currentKey;
bool ThreadImp::_haveCurrentKey = false;


ThreadImp::ThreadImp(): 
	_pTarget(0), 
	_thread(0), 
	_prio(PRIO_NORMAL_IMP)
{
	if (!_haveCurrentKey)
	{
		if (pthread_key_create(&_currentKey, NULL))
			throw SystemException("cannot allocate thread context key");
		_haveCurrentKey = true;
	}
}

			
ThreadImp::~ThreadImp()
{
	if (_pTarget)
		pthread_detach(_thread);
}


void ThreadImp::setPriorityImp(int prio)
{
	if (prio != _prio)
	{
		_prio = prio;
		if (_pTarget)
		{
			struct sched_param par;
			par.sched_priority = mapPrio(_prio);
			if (pthread_setschedparam(_thread, SCHED_OTHER, &par))
				throw SystemException("cannot set thread priority");
		}
	}
}


void ThreadImp::startImp(Runnable& target)
{
	if (_pTarget) throw SystemException("thread already running");

	_pTarget = &target;
	if (pthread_create(&_thread, NULL, entry, this))
	{
		_pTarget = 0;
		throw SystemException("cannot start thread");
	}

	if (_prio != PRIO_NORMAL_IMP)
	{
		struct sched_param par;
		par.sched_priority = mapPrio(_prio);
		if (pthread_setschedparam(_thread, SCHED_OTHER, &par))
			throw SystemException("cannot set thread priority");
	}
}


void ThreadImp::joinImp()
{
	if (!_pTarget) return;
	void* result;
	if (pthread_join(_thread, &result))
		throw SystemException("cannot join thread"); 
	_pTarget = 0;
}


bool ThreadImp::isRunningImp() const
{
	return _pTarget != 0;
}


ThreadImp* ThreadImp::currentImp()
{
	if (_haveCurrentKey)
		return (ThreadImp*) pthread_getspecific(_currentKey);
	else
		return 0;
}


void* ThreadImp::entry(void* pThread)
{
	pthread_setspecific(_currentKey, pThread);

#if defined(POCO_OS_FAMILY_UNIX)
	sigset_t sset;
	sigemptyset(&sset);
	sigaddset(&sset, SIGQUIT);
	sigaddset(&sset, SIGTERM);
	sigaddset(&sset, SIGPIPE); 
	pthread_sigmask(SIG_BLOCK, &sset, 0);
#endif

	try
	{
		reinterpret_cast<ThreadImp*>(pThread)->_pTarget->run();
	}
	catch (...)
	{
	}
	return 0;
}


int ThreadImp::mapPrio(int prio)
{
#if defined(__VMS) || defined(__digital__)
	static const int pmin = PRI_OTHER_MIN;
	static const int pmax = PRI_OTHER_MAX;
#else
	static const int pmin = sched_get_priority_min(SCHED_OTHER);
	static const int pmax = sched_get_priority_max(SCHED_OTHER);
#endif

	switch (prio)
	{
	case PRIO_LOWEST_IMP:
		return pmin;
	case PRIO_LOW_IMP:
		return pmin + (pmax - pmin)/4;
	case PRIO_NORMAL_IMP:
		return pmin + (pmax - pmin)/2;
	case PRIO_HIGH_IMP:
		return pmin + 3*(pmax - pmin)/4;
	case PRIO_HIGHEST_IMP:
		return pmax;
	default:
		poco_bugcheck_msg("invalid thread priority");
	}
	return -1; // just to satisfy compiler - we'll never get here anyway
}


Foundation_END