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/*************************************************************************
* *
* Open Dynamics Engine, Copyright (C) 2001-2003 Russell L. Smith. *
* All rights reserved. Email: russ@q12.org Web: www.q12.org *
* *
* Threading Windows implementation file. *
* Copyright (C) 2011-2019 Oleh Derevenko. All rights reserved. *
* e-mail: odar@eleks.com (change all "a" to "e") *
* *
* This library is free software; you can redistribute it and/or *
* modify it under the terms of EITHER: *
* (1) The GNU Lesser General Public License as published by the Free *
* Software Foundation; either version 2.1 of the License, or (at *
* your option) any later version. The text of the GNU Lesser *
* General Public License is included with this library in the *
* file LICENSE.TXT. *
* (2) The BSD-style license that is included with this library in *
* the file LICENSE-BSD.TXT. *
* *
* This library 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 files *
* LICENSE.TXT and LICENSE-BSD.TXT for more details. *
* *
*************************************************************************/
/*
* Threading Windows implementation for built-in threading support provider.
*/
#ifndef _ODE_THREADING_IMPL_WIN_H_
#define _ODE_THREADING_IMPL_WIN_H_
#include <ode/common.h>
#if defined(_WIN32)
#if dBUILTIN_THREADING_IMPL_ENABLED
#if !defined(_WIN32_WINNT)
#define _WIN32_WINNT 0x0400
#endif
#include <windows.h>
#endif // #if dBUILTIN_THREADING_IMPL_ENABLED
#include "threading_impl_templates.h"
#include "threading_fake_sync.h"
#include "threading_atomics_provs.h"
#if dBUILTIN_THREADING_IMPL_ENABLED
/************************************************************************/
/* dxEventWakeup class implementation */
/************************************************************************/
class dxEventWakeup
{
public:
dxEventWakeup(): m_state_is_permanent(false), m_event_handle(NULL) {}
~dxEventWakeup() { DoFinalizeObject(); }
bool InitializeObject() { return DoInitializeObject(); }
private:
bool DoInitializeObject();
void DoFinalizeObject();
public:
void ResetWakeup();
void WakeupAThread();
void WakeupAllThreads();
bool WaitWakeup(const dThreadedWaitTime *timeout_time_ptr);
private:
bool m_state_is_permanent;
HANDLE m_event_handle;
};
bool dxEventWakeup::DoInitializeObject()
{
dIASSERT(m_event_handle == NULL);
bool init_result = false;
do
{
HANDLE event_handle = CreateEvent(NULL, FALSE, FALSE, NULL);
if (event_handle == NULL)
{
break;
}
m_event_handle = event_handle;
init_result = true;
}
while (false);
return init_result;
}
void dxEventWakeup::DoFinalizeObject()
{
HANDLE event_handle = m_event_handle;
if (event_handle != NULL)
{
BOOL close_result = CloseHandle(event_handle);
dICHECK(close_result != FALSE);
m_event_handle = NULL;
}
}
void dxEventWakeup::ResetWakeup()
{
// Order of assignment and resetting event is not important but it is preferable to be performed this way.
m_state_is_permanent = false;
BOOL event_set_result = ResetEvent(m_event_handle);
dICHECK(event_set_result);
}
void dxEventWakeup::WakeupAThread()
{
dIASSERT(!m_state_is_permanent); // Wakeup should not be used after permanent signal
BOOL event_reset_result = SetEvent(m_event_handle);
dICHECK(event_reset_result);
}
void dxEventWakeup::WakeupAllThreads()
{
// Order of assignment and setting event is important!
m_state_is_permanent = true;
BOOL event_set_result = SetEvent(m_event_handle);
dICHECK(event_set_result);
}
bool dxEventWakeup::WaitWakeup(const dThreadedWaitTime *timeout_time_ptr)
{
bool wait_result;
if (timeout_time_ptr == NULL)
{
DWORD event_wait_result = WaitForSingleObject(m_event_handle, INFINITE);
dICHECK(event_wait_result == WAIT_OBJECT_0);
wait_result = true;
}
else if (timeout_time_ptr->wait_sec == 0 && timeout_time_ptr->wait_nsec == 0)
{
DWORD event_wait_result = WaitForSingleObject(m_event_handle, 0);
wait_result = event_wait_result == WAIT_OBJECT_0;
dICHECK(wait_result || event_wait_result == WAIT_TIMEOUT);
}
else
{
dIASSERT(timeout_time_ptr->wait_nsec < 1000000000UL);
const DWORD max_wait_seconds_in_a_shot = ((INFINITE - 1) / 1000U) - 1;
time_t timeout_seconds_remaining = timeout_time_ptr->wait_sec;
DWORD wait_timeout = timeout_time_ptr->wait_nsec != 0 ? ((timeout_time_ptr->wait_nsec + 999999UL) / 1000000UL) : 0;
while (true)
{
if (timeout_seconds_remaining >= (time_t)max_wait_seconds_in_a_shot)
{
wait_timeout += max_wait_seconds_in_a_shot * 1000U;
timeout_seconds_remaining -= max_wait_seconds_in_a_shot;
}
else
{
wait_timeout += (DWORD)timeout_seconds_remaining * 1000U;
timeout_seconds_remaining = 0;
}
DWORD event_wait_result = WaitForSingleObject(m_event_handle, wait_timeout);
if (event_wait_result == WAIT_OBJECT_0)
{
wait_result = true;
break;
}
dICHECK(event_wait_result == WAIT_TIMEOUT);
if (timeout_seconds_remaining == 0)
{
wait_result = false;
break;
}
wait_timeout = 0;
}
}
if (wait_result && m_state_is_permanent)
{
// Since event is automatic it is necessary to set it back for the upcoming waiters
BOOL event_set_result = SetEvent(m_event_handle);
dICHECK(event_set_result);
}
return wait_result;
}
/************************************************************************/
/* dxCriticalSectionMutex class implementation */
/************************************************************************/
class dxCriticalSectionMutex
{
public:
dxCriticalSectionMutex() { InitializeCriticalSection(&m_critical_section); }
~dxCriticalSectionMutex() { DeleteCriticalSection(&m_critical_section); }
bool InitializeObject() { return true; }
public:
void LockMutex() { EnterCriticalSection(&m_critical_section); }
bool TryLockMutex() { return TryEnterCriticalSection(&m_critical_section) != FALSE; }
void UnlockMutex() { LeaveCriticalSection(&m_critical_section); }
private:
CRITICAL_SECTION m_critical_section;
};
#endif // #if dBUILTIN_THREADING_IMPL_ENABLED
/************************************************************************/
/* Self-threaded job list definition */
/************************************************************************/
typedef dxtemplateJobListContainer<dxFakeLull, dxFakeMutex, dxFakeAtomicsProvider> dxSelfThreadedJobListContainer;
typedef dxtemplateJobListSelfHandler<dxSelfWakeup, dxSelfThreadedJobListContainer> dxSelfThreadedJobListHandler;
typedef dxtemplateThreadingImplementation<dxSelfThreadedJobListContainer, dxSelfThreadedJobListHandler> dxSelfThreadedThreading;
#if dBUILTIN_THREADING_IMPL_ENABLED
/************************************************************************/
/* Multi-threaded job list definition */
/************************************************************************/
typedef dxtemplateJobListContainer<dxtemplateThreadedLull<dxEventWakeup, dxOUAtomicsProvider, false>, dxCriticalSectionMutex, dxOUAtomicsProvider> dxMultiThreadedJobListContainer;
typedef dxtemplateJobListThreadedHandler<dxEventWakeup, dxMultiThreadedJobListContainer> dxMultiThreadedJobListHandler;
typedef dxtemplateThreadingImplementation<dxMultiThreadedJobListContainer, dxMultiThreadedJobListHandler> dxMultiThreadedThreading;
#endif // #if dBUILTIN_THREADING_IMPL_ENABLED
#endif // #if defined(_WIN32)
#endif // #ifndef _ODE_THREADING_IMPL_WIN_H_
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