thread.cpp

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/*
**  ClanLib SDK
**  Copyright (c) 1997-2005 The ClanLib Team
**
**  This software is provided 'as-is', without any express or implied
**  warranty.  In no event will the authors be held liable for any damages
**  arising from the use of this software.
**
**  Permission is granted to anyone to use this software for any purpose,
**  including commercial applications, and to alter it and redistribute it
**  freely, subject to the following restrictions:
**
**  1. The origin of this software must not be misrepresented; you must not
**     claim that you wrote the original software. If you use this software
**     in a product, an acknowledgment in the product documentation would be
**     appreciated but is not required.
**  2. Altered source versions must be plainly marked as such, and must not be
**     misrepresented as being the original software.
**  3. This notice may not be removed or altered from any source distribution.
**
**  Note: Some of the libraries ClanLib link to may have additional
**  requirements or restrictions.
**
**  File Author(s):
**
**    Magnus Norddahl
*/

#include "precomp.h"
#include "thread.h"
#include "runnable.h"

// CL_Thread Construction:

CL_Thread::CL_Thread() : handle(0)
{
}

CL_Thread::~CL_Thread()
{
#ifdef WIN32
        if (handle)
                CloseHandle(handle);
#else
        // todo: Is this needed? We'd rather not kill the thread :/
        //       (yes, I'm too lazy to try find the linsux docs for it)
        if (handle)
                pthread_cancel(handle);
#endif
}

// CL_Thread Attributes:

// CL_Thread Operations:

void CL_Thread::start(CL_Runnable *runnable)
{
        if (runnable == 0)
                throw CL_Exception(TEXT("Invalid runnable pointer"));

#ifdef WIN32
        if (handle)
                CloseHandle(handle);

        DWORD threadId = 0;
        handle = CreateThread(0, 0, &CL_Thread::thread_main, runnable, 0, &threadId);
        if (handle == 0)
        {
                throw CL_Exception(TEXT("Unable to create new thread"));
        }
#else
        int result = pthread_create(&handle, 0, thread_main, runnable);
        if (result != 0)
        {
                handle = 0;
                throw CL_Exception(TEXT("Unable to create new thread"));
        }
#endif
}

void CL_Thread::join()
{
#ifdef WIN32
        WaitForSingleObject(handle, INFINITE);
        if (handle)
                CloseHandle(handle);
#else
        pthread_join(handle, 0);
#endif
        handle = 0;
}

// CL_Thread Implementation:

#ifdef WIN32
DWORD CL_Thread::thread_main(void *data)
{
        CL_Runnable *runnable = (CL_Runnable *) data;
        runnable->run();
        return 0;
}
#else
void *CL_Thread::thread_main(void *data)
{
        // kill thread immidiately - no cancelation point
        pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, 0);

        CL_Runnable *runnable = (CL_Runnable *) data;
        runnable->run();
        return 0;
}
#endif

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