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/* $Id$ */
/*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file thread_os2.cpp OS/2 implementation of Threads. */
#include "../stdafx.h"
#include "thread.h"
#define INCL_DOS
#include <os2.h>
#include <process.h>
#include "../safeguards.h"
/**
* OS/2 version for ThreadObject.
*/
class ThreadObject_OS2 : public ThreadObject {
private:
TID thread; ///< System thread identifier.
OTTDThreadFunc proc; ///< External thread procedure.
void *param; ///< Parameter for the external thread procedure.
bool self_destruct; ///< Free ourselves when done?
public:
/**
* Create a thread and start it, calling proc(param).
*/
ThreadObject_OS2(OTTDThreadFunc proc, void *param, bool self_destruct) :
thread(0),
proc(proc),
param(param),
self_destruct(self_destruct)
{
thread = _beginthread(stThreadProc, NULL, 32768, this);
}
/* virtual */ bool Exit()
{
_endthread();
return true;
}
/* virtual */ void Join()
{
DosWaitThread(&this->thread, DCWW_WAIT);
this->thread = 0;
}
private:
/**
* On thread creation, this function is called, which calls the real startup
* function. This to get back into the correct instance again.
*/
static void stThreadProc(void *thr)
{
((ThreadObject_OS2 *)thr)->ThreadProc();
}
/**
* A new thread is created, and this function is called. Call the custom
* function of the creator of the thread.
*/
void ThreadProc()
{
/* Call the proc of the creator to continue this thread */
try {
this->proc(this->param);
} catch (OTTDThreadExitSignal e) {
} catch (...) {
NOT_REACHED();
}
if (self_destruct) {
this->Exit();
delete this;
}
}
};
/* static */ bool ThreadObject::New(OTTDThreadFunc proc, void *param, ThreadObject **thread)
{
ThreadObject *to = new ThreadObject_OS2(proc, param, thread == NULL);
if (thread != NULL) *thread = to;
return true;
}
/**
* OS/2 version of ThreadMutex.
*/
class ThreadMutex_OS2 : public ThreadMutex {
private:
HMTX mutex; ///< The mutex.
HEV event; ///< Event for waiting.
uint recursive_count; ///< Recursive lock count.
public:
ThreadMutex_OS2() : recursive_count(0)
{
DosCreateMutexSem(NULL, &mutex, 0, FALSE);
DosCreateEventSem(NULL, &event, 0, FALSE);
}
/* virtual */ ~ThreadMutex_OS2()
{
DosCloseMutexSem(mutex);
DosCloseEventSem(event);
}
/* virtual */ void BeginCritical(bool allow_recursive = false)
{
/* os2 mutex is recursive by itself */
DosRequestMutexSem(mutex, (unsigned long) SEM_INDEFINITE_WAIT);
this->recursive_count++;
if (!allow_recursive && this->recursive_count != 1) NOT_REACHED();
}
/* virtual */ void EndCritical(bool allow_recursive = false)
{
if (!allow_recursive && this->recursive_count != 1) NOT_REACHED();
this->recursive_count--;
DosReleaseMutexSem(mutex);
}
/* virtual */ void WaitForSignal()
{
assert(this->recursive_count == 1); // Do we need to call Begin/EndCritical multiple times otherwise?
this->EndCritical();
DosWaitEventSem(event, SEM_INDEFINITE_WAIT);
this->BeginCritical();
}
/* virtual */ void SendSignal()
{
DosPostEventSem(event);
}
};
/* static */ ThreadMutex *ThreadMutex::New()
{
return new ThreadMutex_OS2();
}
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