IEnumerator SignalBasedAdvancedMultithreadYielding()
{
var bounds = new Bounds(_BoundCenter, _BoundSize);
//these will help with synchronization between threads
WaitForSignalEnumerator mainWaitForSignal = new WaitForSignalEnumerator("MainThreadWait", 1000);
WaitForSignalEnumerator otherwaitForSignal = new WaitForSignalEnumerator
("OtherThreadWait", () => isActiveAndEnabled == false, 1000);
//Start the operations on other threads
OperationsRunningOnOtherThreads(mainWaitForSignal, otherwaitForSignal)
.RunOnScheduler(StandardSchedulers.multiThreadScheduler);
//start the main thread loop
while (true)
{
_time = Time.time / 10;
//Since we want to feed the GPU with the data processed
//from the other thread, we can't set the particleDataBuffer
//until this operation is done. For this reason we stall
//the mainthread until the data is ready. This operation is advanced
//as it could stall the game for ever if you don't know
//what you are doing!
otherwaitForSignal.Complete();
#if BENCHMARK
if (PerformanceCheker.PerformanceProfiler.showingFPSValue > 30.0f)
{
if (_pc.particlesLimit >= 16)
{
_pc.particlesLimit -= 16;
}
PerformanceCheker.PerformanceProfiler.particlesCount = _pc.particlesTransformed;
}
#endif
_pc.particlesTransformed = 0;
_particleDataBuffer.SetData(_gpuparticleDataArr);
//tell to the other thread that now it can perform the operations
//for the next frame.
mainWaitForSignal.Signal();
//do something seriously slow
#if DO_SOMETHING_SERIOUSLY_SLOW
Thread.Sleep(10);
#endif
//render the particles. I use DrawMeshInstancedIndirect but
//there aren't any compute shaders running. This is so cool!
Graphics.DrawMeshInstancedIndirect(_pointMesh, 0, _material,
bounds, _GPUInstancingArgsBuffer);
//continue the cycle on the next frame
yield return(null);
}
}
IEnumerator MainThreadOperations(ParticleCounter particleCounter)
{
var bounds = new Bounds(_BoundCenter, _BoundSize);
var syncRunner = new SyncRunner();
//these will help with synchronization between threads
WaitForSignalEnumerator _waitForSignal = new WaitForSignalEnumerator(() => _breakIt);
WaitForSignalEnumerator _otherwaitForSignal = new WaitForSignalEnumerator();
//Start the operations on other threads
OperationsRunningOnOtherThreads(_waitForSignal, _otherwaitForSignal)
.ThreadSafeRunOnSchedule(StandardSchedulers.multiThreadScheduler);
//start the mainloop
while (true)
{
_time = Time.time / 10;
//wait until the other thread tell us that the data is ready to be used.
//Note that I am stalling the main thread here! This is entirely up to you
//if you don't want to stall it, as you can see with the other use cases
_otherwaitForSignal.RunOnSchedule(syncRunner);
#if BENCHMARK
if (PerformanceCheker.PerformanceProfiler.showingFPSValue > 30.0f)
{
if (particleCounter.particlesLimit >= 16)
{
particleCounter.particlesLimit -= 16;
}
PerformanceCheker.PerformanceProfiler.particlesCount = particleCounter.particlesTransformed;
}
particleCounter.particlesTransformed = 0;
#endif
_particleDataBuffer.SetData(_gpuparticleDataArr);
//render the particles. I use DrawMeshInstancedIndirect but
//there aren't any compute shaders running. This is so cool!
Graphics.DrawMeshInstancedIndirect(_pointMesh, 0, _material,
bounds, _GPUInstancingArgsBuffer);
//tell to the other thread that now it can perform the operations
//for the next frame.
_waitForSignal.Signal();
//continue the cycle on the next frame
yield return(null);
}
}
IEnumerator OperationsRunningOnOtherThreads(WaitForSignalEnumerator waitForSignal,
WaitForSignalEnumerator otherWaitForSignal)
{
//a SyncRunner stop the execution of the thread until the task is not completed
//the parameter true means that the runner will sleep in between yields
var syncRunner = new SyncRunner();
while (_breakIt == false)
{
//execute the tasks. The MultiParallelTask is a special collection
//that uses N threads on its own to execute the tasks. This thread
//doesn't need to do anything else meanwhile and will yield until
//is done. That's why the syncrunner can sleep between yields, so
//that this thread won't take much CPU just to wait the parallel
//tasks to finish
_multiParallelTasks.ThreadSafeRunOnSchedule(syncRunner);
#if BENCHMARK //do it x4
_multiParallelTasks.ThreadSafeRunOnSchedule(syncRunner);
_multiParallelTasks.ThreadSafeRunOnSchedule(syncRunner);
_multiParallelTasks.ThreadSafeRunOnSchedule(syncRunner);
#endif
//the 1 Million particles operation are done, let's signal that the
//result can now be used
otherWaitForSignal.Signal();
//wait until the application is over or the main thread will tell
//us that now we can perform again the particles operation. This
//is an explicit while instead of a yield, just because if the _breakIt
//condition, which is needed only because if this application runs
//in the editor, the threads spawned will not stop until the Editor is
//shut down.
waitForSignal.RunOnSchedule(syncRunner);
}
//the application is shutting down. This is not that necessary in a
//standalone client, but necessary to stop the thread when the
//application is stopped in the Editor to stop all the threads.
_multiParallelTasks.ClearAndKill();
TaskRunner.Instance.StopAndCleanupAllDefaultSchedulerTasks();
yield break;
}
IEnumerator OperationsRunningOnOtherThreads(WaitForSignalEnumerator mainWaitForSignal,
WaitForSignalEnumerator otherWaitForSignal)
{
while (true)
{
//execute the tasks. The MultiParallelTask is a special collection
//that uses N threads on its own to execute the tasks. The
//complete operation is similar to the Unity Jobs complete
//operations. It stalls the thread where it's called from
//until everything is done!
yield return(_multiParallelTasks);
//the 1 Million particles operation are done, let's signal that the
//result can now be used
otherWaitForSignal.Signal();
//yield until the application is over or the main thread will tell
//us that now we can perform again the particles operation.
//since we are not using the thread for anything else
//we can stall the thread here until is done
yield return(mainWaitForSignal);
}
}
