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thread.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program 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; either version 2
 * of the License, or (at your option) any later version.

 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */

#include <pspthreadman.h>

#include "backends/platform/psp/thread.h"
#include "backends/platform/psp/trace.h"

// Class PspThreadable --------------------------------------------------
// Inherit this to create C++ threads easily

bool PspThreadable::threadCreateAndStart(const char *threadName, int priority, int stackSize, bool useVfpu /*= false*/) {
      DEBUG_ENTER_FUNC();

      if (_threadId != -1) {
            PSP_ERROR("thread already created!\n");
            return false;
      }

      _threadId = sceKernelCreateThread(threadName, __threadCallback, priority, stackSize, THREAD_ATTR_USER, 0);  // add VFPU support

      if (_threadId < 0) {
            PSP_ERROR("failed to create %s thread. Error code %d\n", threadName, _threadId);
            return false;
      }

      // We want to pass the pointer to this, but we'll have to take address of this so use a little trick
      PspThreadable *_this = this;

      if (sceKernelStartThread(_threadId, sizeof(uint32 *), &_this) < 0) {
            PSP_ERROR("failed to start %s thread id[%d]\n", threadName, _threadId);
            return false;
      }

      PSP_DEBUG_PRINT("Started %s thread with id[%x]\n", threadName, _threadId);

      return true;
}

// Callback function to be called by PSP kernel
int PspThreadable::__threadCallback(SceSize, void *__this) {
      DEBUG_ENTER_FUNC();

      PspThreadable *_this = *(PspThreadable **)__this;     // Dereference the copied value which was 'this'

      _this->threadFunction();      // call the virtual function

      return 0;
}

// PspThread class
// Utilities to access general thread functions

void PspThread::delayMillis(uint32 ms) {
      sceKernelDelayThread(ms * 1000);
}

void PspThread::delayMicros(uint32 us) {
      sceKernelDelayThread(us);
}

// Class PspSemaphore ------------------------------------------------
//#define __PSP_DEBUG_FUNCS__ /* For debugging function calls */
//#define __PSP_DEBUG_PRINT__ /* For debug printouts */

#include "backends/platform/psp/trace.h"

PspSemaphore::PspSemaphore(int initialValue, int maxValue/*=255*/) {
      DEBUG_ENTER_FUNC();
      _handle = 0;
      _handle = (uint32)sceKernelCreateSema("ScummVM Sema", 0 /* attr */,
                                                  initialValue, maxValue,
                                                  0 /*option*/);
      if (!_handle)
            PSP_ERROR("failed to create semaphore.\n");
}

PspSemaphore::~PspSemaphore() {
      DEBUG_ENTER_FUNC();
      if (_handle)
            if (sceKernelDeleteSema((SceUID)_handle) < 0)
                  PSP_ERROR("failed to delete semaphore.\n");
}

int PspSemaphore::numOfWaitingThreads() {
      DEBUG_ENTER_FUNC();
      SceKernelSemaInfo info;
      info.numWaitThreads = 0;

      if (sceKernelReferSemaStatus((SceUID)_handle, &info) < 0)
            PSP_ERROR("failed to retrieve semaphore info for handle %d\n", _handle);

      return info.numWaitThreads;
}

int PspSemaphore::getValue() {
      DEBUG_ENTER_FUNC();
      SceKernelSemaInfo info;
      info.currentCount = 0;

      if (sceKernelReferSemaStatus((SceUID)_handle, &info) < 0)
            PSP_ERROR("failed to retrieve semaphore info for handle %d\n", _handle);

      return info.currentCount;
}

bool PspSemaphore::pollForValue(int value) {
      DEBUG_ENTER_FUNC();
      if (sceKernelPollSema((SceUID)_handle, value) < 0)
            return false;

      return true;
}

// false: timeout or error
bool PspSemaphore::takeWithTimeOut(uint32 timeOut) {
      DEBUG_ENTER_FUNC();

      uint32 *pTimeOut = 0;
      if (timeOut)
            pTimeOut = &timeOut;

      if (sceKernelWaitSema(_handle, 1, pTimeOut) < 0)      // we always wait for 1
            return false;
      return true;
}

bool PspSemaphore::give(int num /*=1*/) {
      DEBUG_ENTER_FUNC();

      if (sceKernelSignalSema((SceUID)_handle, num) < 0)
            return false;
      return true;
}

// Class PspMutex ------------------------------------------------------------

bool PspMutex::lock() {
      DEBUG_ENTER_FUNC();
      int threadId = sceKernelGetThreadId();
      bool ret = true;

      if (_ownerId == threadId) {
            _recursiveCount++;
      } else {
            ret = _semaphore.take();
            _ownerId = threadId;
            _recursiveCount = 0;
      }
      return ret;
}

bool PspMutex::unlock() {
      DEBUG_ENTER_FUNC();
      int threadId = sceKernelGetThreadId();
      bool ret = true;

      if (_ownerId != threadId) {
            PSP_ERROR("attempt to unlock mutex by thread[%x] as opposed to owner[%x]\n",
                  threadId, _ownerId);
            return false;
      }

      if (_recursiveCount) {
            _recursiveCount--;
      } else {
            _ownerId = 0;
            ret = _semaphore.give(1);
      }
      return ret;
}

// Class PspCondition -------------------------------------------------

// Release all threads waiting on the condition
void PspCondition::releaseAll() {
        _mutex.lock();
        if (_waitingThreads > _signaledThreads) {     // we have signals to issue
                int numWaiting = _waitingThreads - _signaledThreads;    // threads we haven't signaled
                _signaledThreads = _waitingThreads;

                        _waitSem.give(numWaiting);
                _mutex.unlock();
                for (int i=0; i<numWaiting; i++)      // wait for threads to tell us they're awake
                              _doneSem.take();
        } else {
                _mutex.unlock();
        }
}

// Mutex must be taken before entering wait
void PspCondition::wait(PspMutex &externalMutex) {
        _mutex.lock();
        _waitingThreads++;
        _mutex.unlock();

        externalMutex.unlock();     // must unlock external mutex

            _waitSem.take();  // sleep on the wait semaphore

            // let the signaling thread know we're done
            _mutex.lock();
        if (_signaledThreads > 0 ) {
                _doneSem.give();    // let the thread know
                _signaledThreads--;
        }
        _waitingThreads--;
        _mutex.unlock();

        externalMutex.lock();       // must lock external mutex here for continuation
}


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