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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_win32.cpp Win32 thread implementation of Threads. */
#include "../stdafx.h"
#include "thread.h"
#include "../debug.h"
#include "../core/alloc_func.hpp"
#include <stdlib.h>
#include <windows.h>
#include <process.h>
#include "../os/windows/win32.h"
#include "../safeguards.h"
/**
* Win32 thread version for ThreadObject.
*/
class ThreadObject_Win32 : public ThreadObject {
private:
HANDLE thread; ///< System thread identifier.
uint id; ///< Thread identifier.
OTTDThreadFunc proc; ///< External thread procedure.
void *param; ///< Parameter for the external thread procedure.
bool self_destruct; ///< Free ourselves when done?
const char *name; ///< Thread name.
public:
/**
* Create a win32 thread and start it, calling proc(param).
*/
ThreadObject_Win32(OTTDThreadFunc proc, void *param, bool self_destruct, const char *name) :
thread(NULL),
id(0),
proc(proc),
param(param),
self_destruct(self_destruct),
name(name)
{
this->thread = (HANDLE)_beginthreadex(NULL, 0, &stThreadProc, this, CREATE_SUSPENDED, &this->id);
if (this->thread == NULL) return;
ResumeThread(this->thread);
}
~ThreadObject_Win32() override
{
if (this->thread != NULL) {
CloseHandle(this->thread);
this->thread = NULL;
}
}
bool Exit() override
{
assert(GetCurrentThreadId() == this->id);
/* For now we terminate by throwing an error, gives much cleaner cleanup */
throw OTTDThreadExitSignal();
}
void Join() override
{
/* You cannot join yourself */
assert(GetCurrentThreadId() != this->id);
WaitForSingleObject(this->thread, INFINITE);
}
private:
/**
* On thread creation, this function is called, which calls the real startup
* function. This to get back into the correct instance again.
*/
static uint CALLBACK stThreadProc(void *thr)
{
((ThreadObject_Win32 *)thr)->ThreadProc();
return 0;
}
/**
* A new thread is created, and this function is called. Call the custom
* function of the creator of the thread.
*/
void ThreadProc()
{
#ifdef _MSC_VER
/* Set thread name for debuggers. Has to be done from the thread due to a race condition in older MS debuggers. */
SetWin32ThreadName(-1, this->name);
#endif
try {
this->proc(this->param);
} catch (OTTDThreadExitSignal) {
} catch (...) {
NOT_REACHED();
}
if (self_destruct) delete this;
}
};
/* static */ bool ThreadObject::New(OTTDThreadFunc proc, void *param, ThreadObject **thread, const char *name)
{
ThreadObject *to = new ThreadObject_Win32(proc, param, thread == NULL, name);
if (thread != NULL) *thread = to;
return true;
}
/**
* Win32 thread version of ThreadMutex.
*/
class ThreadMutex_Win32 : public ThreadMutex {
private:
CRITICAL_SECTION critical_section; ///< The critical section we would enter.
HANDLE event; ///< Event for signalling.
uint recursive_count; ///< Recursive lock count.
public:
ThreadMutex_Win32() : recursive_count(0)
{
InitializeCriticalSection(&this->critical_section);
this->event = CreateEvent(NULL, FALSE, FALSE, NULL);
}
~ThreadMutex_Win32() override
{
DeleteCriticalSection(&this->critical_section);
CloseHandle(this->event);
}
void BeginCritical(bool allow_recursive = false) override
{
/* windows mutex is recursive by itself */
EnterCriticalSection(&this->critical_section);
this->recursive_count++;
if (!allow_recursive && this->recursive_count != 1) NOT_REACHED();
}
void EndCritical(bool allow_recursive = false) override
{
if (!allow_recursive && this->recursive_count != 1) NOT_REACHED();
this->recursive_count--;
LeaveCriticalSection(&this->critical_section);
}
void WaitForSignal() override
{
assert(this->recursive_count == 1); // Do we need to call Begin/EndCritical multiple times otherwise?
this->EndCritical();
WaitForSingleObject(this->event, INFINITE);
this->BeginCritical();
}
void SendSignal() override
{
SetEvent(this->event);
}
};
/* static */ ThreadMutex *ThreadMutex::New()
{
return new ThreadMutex_Win32();
}
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