ExtCpuWorkerThreadHx.cpp

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/**
 * Modified from physx\source\physxextensions\src\ExtCpuWorkerThread.h, by Malody Hoe
 * for Haxe/hxcpp to attach or detach threads for Haxe GC.
 */

#include <hxcpp.h>

#include "task/PxTask.h"
#include "ExtCpuWorkerThreadHx.h"
#include "ExtDefaultCpuDispatcherHx.h"
#include "ExtTaskQueueHelper.h"
#include "PsFPU.h"

using namespace physx;

Ext::CpuWorkerThreadHx::CpuWorkerThreadHx()
:	mQueueEntryPool(EXT_TASK_QUEUE_ENTRY_POOL_SIZE),
	mThreadId(0)
{
}


Ext::CpuWorkerThreadHx::~CpuWorkerThreadHx()
{
}


void Ext::CpuWorkerThreadHx::initialize(DefaultCpuDispatcherHx* ownerDispatcher)
{
	mOwner = ownerDispatcher;
}


bool Ext::CpuWorkerThreadHx::tryAcceptJobToLocalQueue(PxBaseTask& task, Ps::Thread::Id taskSubmitionThread)
{
	if(taskSubmitionThread == mThreadId)
	{
		SharedQueueEntry* entry = mQueueEntryPool.getEntry(&task);
		if (entry)
		{
			mLocalJobList.push(*entry);
			return true;
		}
		else
			return false;
	}

	return false;
}


PxBaseTask* Ext::CpuWorkerThreadHx::giveUpJob()
{
	return TaskQueueHelper::fetchTask(mLocalJobList, mQueueEntryPool);
}


void Ext::CpuWorkerThreadHx::execute()
{
	mThreadId = getId();

	while (!quitIsSignalled())
    {
        mOwner->resetWakeSignal();

		PxBaseTask* task = TaskQueueHelper::fetchTask(mLocalJobList, mQueueEntryPool);

		if(!task)
			task = mOwner->fetchNextTask();
		
		if (task)
		{
			// attach thread to Haxe GC. see https://haxe.org/manual/target-cpp-ThreadsAndStacks.html
			int t0 = 0;
			hx::SetTopOfStack(&t0, true);

			mOwner->runTask(*task);

			// detach thread from Haxe GC.
			hx::SetTopOfStack(0, true);

			task->release();
		}
		else
		{
			mOwner->waitForWork();
		}
	}

	quit();
}