Beispiel #1
0
TEST(BusyLoopTest, MultiThreaded)
{
  Common::BlockingLoop loop;
  Common::Event e;
  for (int i = 0; i < 100; i++)
  {
    loop.Prepare();
    std::thread loop_thread([&]() { loop.Run([&]() { e.Set(); }); });

    // Ping - Pong
    for (int j = 0; j < 10; j++)
    {
      loop.Wakeup();
      e.Wait();

      // Just waste some time. So the main loop did fall back to the sleep state much more likely.
      Common::SleepCurrentThread(1);
    }

    for (int j = 0; j < 100; j++)
    {
      // We normally have to call Wakeup to assure the Event is triggered.
      // But this check is for an internal feature of the BlockingLoop.
      // It's implemented to fall back to a busy loop regulary.
      // If we're in the busy loop, the payload (and so the Event) is called all the time.
      // loop.Wakeup();
      e.Wait();
    }

    loop.Stop();
    loop_thread.join();
  }
}
Beispiel #2
0
// Description: Main FIFO update loop
// Purpose: Keep the Core HW updated about the CPU-GPU distance
void RunGpuLoop()
{

	AsyncRequests::GetInstance()->SetEnable(true);
	AsyncRequests::GetInstance()->SetPassthrough(false);

	s_gpu_mainloop.Run(
	[] {
		const SConfig& param = SConfig::GetInstance();

		g_video_backend->PeekMessages();

		// Do nothing while paused
		if (!s_emu_running_state.load())
			return;

		if (g_use_deterministic_gpu_thread)
		{
			AsyncRequests::GetInstance()->PullEvents();

			// All the fifo/CP stuff is on the CPU.  We just need to run the opcode decoder.
			u8* seen_ptr = s_video_buffer_seen_ptr;
			u8* write_ptr = s_video_buffer_write_ptr;
			// See comment in SyncGPU
			if (write_ptr > seen_ptr)
			{
				s_video_buffer_read_ptr = OpcodeDecoder_Run(DataReader(s_video_buffer_read_ptr, write_ptr), nullptr, false);
				s_video_buffer_seen_ptr = write_ptr;
			}
		}
		else
		{
			SCPFifoStruct &fifo = CommandProcessor::fifo;

			AsyncRequests::GetInstance()->PullEvents();

			CommandProcessor::SetCPStatusFromGPU();

			// check if we are able to run this buffer
			while (!CommandProcessor::IsInterruptWaiting() && fifo.bFF_GPReadEnable && fifo.CPReadWriteDistance && !AtBreakpoint())
			{
				if (param.bSyncGPU && s_sync_ticks.load() < param.iSyncGpuMinDistance)
					break;

				u32 cyclesExecuted = 0;
				u32 readPtr = fifo.CPReadPointer;
				ReadDataFromFifo(readPtr);

				if (readPtr == fifo.CPEnd)
					readPtr = fifo.CPBase;
				else
					readPtr += 32;

				_assert_msg_(COMMANDPROCESSOR, (s32)fifo.CPReadWriteDistance - 32 >= 0 ,
					"Negative fifo.CPReadWriteDistance = %i in FIFO Loop !\nThat can produce instability in the game. Please report it.", fifo.CPReadWriteDistance - 32);

				u8* write_ptr = s_video_buffer_write_ptr;
				s_video_buffer_read_ptr = OpcodeDecoder_Run(DataReader(s_video_buffer_read_ptr, write_ptr), &cyclesExecuted, false);

				Common::AtomicStore(fifo.CPReadPointer, readPtr);
				Common::AtomicAdd(fifo.CPReadWriteDistance, -32);
				if ((write_ptr - s_video_buffer_read_ptr) == 0)
					Common::AtomicStore(fifo.SafeCPReadPointer, fifo.CPReadPointer);

				CommandProcessor::SetCPStatusFromGPU();

				if (param.bSyncGPU)
				{
					cyclesExecuted = (int)(cyclesExecuted / param.fSyncGpuOverclock);
					int old = s_sync_ticks.fetch_sub(cyclesExecuted);
					if (old > 0 && old - (int)cyclesExecuted <= 0)
						s_sync_wakeup_event.Set();
				}

				// This call is pretty important in DualCore mode and must be called in the FIFO Loop.
				// If we don't, s_swapRequested or s_efbAccessRequested won't be set to false
				// leading the CPU thread to wait in Video_BeginField or Video_AccessEFB thus slowing things down.
				AsyncRequests::GetInstance()->PullEvents();
			}

			// fast skip remaining GPU time if fifo is empty
			if (s_sync_ticks.load() > 0)
			{
				int old = s_sync_ticks.exchange(0);
				if (old > 0)
					s_sync_wakeup_event.Set();
			}

			// The fifo is empty and it's unlikely we will get any more work in the near future.
			// Make sure VertexManager finishes drawing any primitives it has stored in it's buffer.
			VertexManager::Flush();
		}
	}, 100);

	AsyncRequests::GetInstance()->SetEnable(false);
	AsyncRequests::GetInstance()->SetPassthrough(true);
}