C++ common::Event类代码示例

void DSPLLE::DSP_Update(int cycles)
{
	int dsp_cycles = cycles / 6;

	if (dsp_cycles <= 0)
		return;
// Sound stream update job has been handled by AudioDMA routine, which is more efficient
/*
	// This gets called VERY OFTEN. The soundstream update might be expensive so only do it 200 times per second or something.
	int cycles_between_ss_update;

	if (g_dspInitialize.bWii)
		cycles_between_ss_update = 121500000 / 200;
	else
		cycles_between_ss_update = 81000000 / 200;

	m_cycle_count += cycles;
	if (m_cycle_count > cycles_between_ss_update)
	{
		while (m_cycle_count > cycles_between_ss_update)
			m_cycle_count -= cycles_between_ss_update;
		soundStream->Update();
	}
*/
	if (m_bDSPThread)
	{
		if (requestDisableThread || NetPlay::IsNetPlayRunning() || Movie::IsMovieActive() || Core::g_want_determinism)
		{
			DSP_StopSoundStream();
			m_bDSPThread = false;
			requestDisableThread = false;
			SConfig::GetInstance().bDSPThread = false;
		}
	}

	// If we're not on a thread, run cycles here.
	if (!m_bDSPThread)
	{
		// ~1/6th as many cycles as the period PPC-side.
		DSPCore_RunCycles(dsp_cycles);
	}
	else
	{
		// Wait for DSP thread to complete its cycle. Note: this logic should be thought through.
		ppcEvent.Wait();
		m_cycle_count.fetch_add(dsp_cycles);
		dspEvent.Set();
	}
}

void Start()
{
  s_finish_read = CoreTiming::RegisterEvent("FinishReadDVDThread", FinishRead);

  s_request_queue_expanded.Reset();
  s_result_queue_expanded.Reset();
  s_request_queue.Clear();
  s_result_queue.Clear();

  // This is reset on every launch for determinism, but it doesn't matter
  // much, because this will never get exposed to the emulated game.
  s_next_id = 0;

  StartDVDThread();
}

static void StartReadInternal(bool copy_to_ram, u32 output_address, u64 dvd_offset, u32 length,
                              const DiscIO::Partition& partition,
                              DVDInterface::ReplyType reply_type, s64 ticks_until_completion)
{
  ASSERT(Core::IsCPUThread());

  ReadRequest request;

  request.copy_to_ram = copy_to_ram;
  request.output_address = output_address;
  request.dvd_offset = dvd_offset;
  request.length = length;
  request.partition = partition;
  request.reply_type = reply_type;

  u64 id = s_next_id++;
  request.id = id;

  request.time_started_ticks = CoreTiming::GetTicks();
  request.realtime_started_us = Common::Timer::GetTimeUs();

  s_request_queue.Push(std::move(request));
  s_request_queue_expanded.Set();

  CoreTiming::ScheduleEvent(ticks_until_completion, s_finish_read, id);
}

void Host_Message(int Id)
{
  if (Id == WM_USER_STOP)
  {
    s_running.Clear();
    updateMainFrameEvent.Set();
  }
}

void VideoFifo_CheckEFBAccess()
{
	if (s_efbAccessRequested.IsSet())
	{
		s_AccessEFBResult = g_renderer->AccessEFB(s_accessEFBArgs.type, s_accessEFBArgs.x, s_accessEFBArgs.y, s_accessEFBArgs.Data);
		s_efbAccessRequested.Clear();
		s_efbAccessReadyEvent.Set();
	}
}

static void VideoFifo_CheckPerfQueryRequest()
{
	if (s_perfQueryRequested.IsSet())
	{
		g_perf_query->FlushResults();
		s_perfQueryRequested.Clear();
		s_perfQueryReadyEvent.Set();
	}
}

void DSPLLE::DSP_Update(int cycles)
{
	int dsp_cycles = cycles / 6;

	if (dsp_cycles <= 0)
		return;
// Sound stream update job has been handled by AudioDMA routine, which is more efficient
/*
	// This gets called VERY OFTEN. The soundstream update might be expensive so only do it 200 times per second or something.
	int cycles_between_ss_update;

	if (g_dspInitialize.bWii)
		cycles_between_ss_update = 121500000 / 200;
	else
		cycles_between_ss_update = 81000000 / 200;

	m_cycle_count += cycles;
	if (m_cycle_count > cycles_between_ss_update)
	{
		while (m_cycle_count > cycles_between_ss_update)
			m_cycle_count -= cycles_between_ss_update;
		soundStream->Update();
	}
*/
	// If we're not on a thread, run cycles here.
	if (!m_bDSPThread)
	{
		// ~1/6th as many cycles as the period PPC-side.
		DSPCore_RunCycles(dsp_cycles);
	}
	else
	{
		// Wait for dsp thread to complete its cycle. Note: this logic should be thought through.
		ppcEvent.Wait();
		Common::AtomicStore(m_cycle_count, dsp_cycles);
		dspEvent.Set();

	}
}

u32 VideoBackendHardware::Video_GetQueryResult(PerfQueryType type)
{
	if (!g_perf_query->ShouldEmulate())
	{
		return 0;
	}

	// TODO: Is this check sane?
	if (!g_perf_query->IsFlushed())
	{
		if (SConfig::GetInstance().m_LocalCoreStartupParameter.bCPUThread)
		{
			s_perfQueryReadyEvent.Reset();
			if (s_FifoShuttingDown.IsSet())
				return 0;
			s_perfQueryRequested.Set();
			s_perfQueryReadyEvent.Wait();
		}
		else
			g_perf_query->FlushResults();
	}

	return g_perf_query->GetQueryResult(type);
}

namespace Fifo
{
static constexpr u32 FIFO_SIZE = 2 * 1024 * 1024;
static constexpr int GPU_TIME_SLOT_SIZE = 1000;

static Common::BlockingLoop s_gpu_mainloop;

static Common::Flag s_emu_running_state;

// Most of this array is unlikely to be faulted in...
static u8 s_fifo_aux_data[FIFO_SIZE];
static u8* s_fifo_aux_write_ptr;
static u8* s_fifo_aux_read_ptr;

// This could be in SConfig, but it depends on multiple settings
// and can change at runtime.
static bool s_use_deterministic_gpu_thread;

static CoreTiming::EventType* s_event_sync_gpu;

// STATE_TO_SAVE
static u8* s_video_buffer;
static u8* s_video_buffer_read_ptr;
static std::atomic<u8*> s_video_buffer_write_ptr;
static std::atomic<u8*> s_video_buffer_seen_ptr;
static u8* s_video_buffer_pp_read_ptr;
// The read_ptr is always owned by the GPU thread.  In normal mode, so is the
// write_ptr, despite it being atomic.  In deterministic GPU thread mode,
// things get a bit more complicated:
// - The seen_ptr is written by the GPU thread, and points to what it's already
// processed as much of as possible - in the case of a partial command which
// caused it to stop, not the same as the read ptr.  It's written by the GPU,
// under the lock, and updating the cond.
// - The write_ptr is written by the CPU thread after it copies data from the
// FIFO.  Maybe someday it will be under the lock.  For now, because RunGpuLoop
// polls, it's just atomic.
// - The pp_read_ptr is the CPU preprocessing version of the read_ptr.

static std::atomic<int> s_sync_ticks;
static bool s_syncing_suspended;
static Common::Event s_sync_wakeup_event;

void DoState(PointerWrap& p)
{
  p.DoArray(s_video_buffer, FIFO_SIZE);
  u8* write_ptr = s_video_buffer_write_ptr;
  p.DoPointer(write_ptr, s_video_buffer);
  s_video_buffer_write_ptr = write_ptr;
  p.DoPointer(s_video_buffer_read_ptr, s_video_buffer);
  if (p.mode == PointerWrap::MODE_READ && s_use_deterministic_gpu_thread)
  {
    // We're good and paused, right?
    s_video_buffer_seen_ptr = s_video_buffer_pp_read_ptr = s_video_buffer_read_ptr;
  }

  p.Do(s_sync_ticks);
  p.Do(s_syncing_suspended);
}

void PauseAndLock(bool doLock, bool unpauseOnUnlock)
{
  if (doLock)
  {
    SyncGPU(SyncGPUReason::Other);
    EmulatorState(false);

    const SConfig& param = SConfig::GetInstance();

    if (!param.bCPUThread || s_use_deterministic_gpu_thread)
      return;

    s_gpu_mainloop.WaitYield(std::chrono::milliseconds(100), Host_YieldToUI);
  }
  else
  {
    if (unpauseOnUnlock)
      EmulatorState(true);
  }
}

void Init()
{
  // Padded so that SIMD overreads in the vertex loader are safe
  s_video_buffer = static_cast<u8*>(Common::AllocateMemoryPages(FIFO_SIZE + 4));
  ResetVideoBuffer();
  if (SConfig::GetInstance().bCPUThread)
    s_gpu_mainloop.Prepare();
  s_sync_ticks.store(0);
}

void Shutdown()
{
  if (s_gpu_mainloop.IsRunning())
    PanicAlert("Fifo shutting down while active");

  Common::FreeMemoryPages(s_video_buffer, FIFO_SIZE + 4);
  s_video_buffer = nullptr;
  s_video_buffer_write_ptr = nullptr;
  s_video_buffer_pp_read_ptr = nullptr;
  s_video_buffer_read_ptr = nullptr;
//.........这里部分代码省略.........

/* This function checks the emulated CPU - GPU distance and may wake up the GPU,
 * or block the CPU if required. It should be called by the CPU thread regularly.
 * @ticks The gone emulated CPU time.
 * @return A good time to call WaitForGpuThread() next.
 */
static int WaitForGpuThread(int ticks)
{
  const SConfig& param = SConfig::GetInstance();

  int old = s_sync_ticks.fetch_add(ticks);
  int now = old + ticks;

  // GPU is idle, so stop polling.
  if (old >= 0 && s_gpu_mainloop.IsDone())
    return -1;

  // Wakeup GPU
  if (old < param.iSyncGpuMinDistance && now >= param.iSyncGpuMinDistance)
    RunGpu();

  // If the GPU is still sleeping, wait for a longer time
  if (now < param.iSyncGpuMinDistance)
    return GPU_TIME_SLOT_SIZE + param.iSyncGpuMinDistance - now;

  // Wait for GPU
  if (now >= param.iSyncGpuMaxDistance)
    s_sync_wakeup_event.Wait();

  return GPU_TIME_SLOT_SIZE;
}

static void FinishRead(u64 id, s64 cycles_late)
{
  // We can't simply pop s_result_queue and always get the ReadResult
  // we want, because the DVD thread may add ReadResults to the queue
  // in a different order than we want to get them. What we do instead
  // is to pop the queue until we find the ReadResult we want (the one
  // whose ID matches userdata), which means we may end up popping
  // ReadResults that we don't want. We can't add those unwanted results
  // back to the queue, because the queue can only have one writer.
  // Instead, we add them to a map that only is used by the CPU thread.
  // When this function is called again later, it will check the map for
  // the wanted ReadResult before it starts searching through the queue.
  ReadResult result;
  auto it = s_result_map.find(id);
  if (it != s_result_map.end())
  {
    result = std::move(it->second);
    s_result_map.erase(it);
  }
  else
  {
    while (true)
    {
      while (!s_result_queue.Pop(result))
        s_result_queue_expanded.Wait();

      if (result.first.id == id)
        break;
      else
        s_result_map.emplace(result.first.id, std::move(result));
    }
  }
  // We have now obtained the right ReadResult.

  const ReadRequest& request = result.first;
  const std::vector<u8>& buffer = result.second;

  DEBUG_LOG(DVDINTERFACE, "Disc has been read. Real time: %" PRIu64 " us. "
                          "Real time including delay: %" PRIu64 " us. "
                          "Emulated time including delay: %" PRIu64 " us.",
            request.realtime_done_us - request.realtime_started_us,
            Common::Timer::GetTimeUs() - request.realtime_started_us,
            (CoreTiming::GetTicks() - request.time_started_ticks) /
                (SystemTimers::GetTicksPerSecond() / 1000000));

  if (buffer.size() != request.length)
  {
    PanicAlertT("The disc could not be read (at 0x%" PRIx64 " - 0x%" PRIx64 ").",
                request.dvd_offset, request.dvd_offset + request.length);
  }
  else
  {
    if (request.copy_to_ram)
      Memory::CopyToEmu(request.output_address, buffer.data(), request.length);
  }

  // Notify the emulated software that the command has been executed
  DVDInterface::FinishExecutingCommand(request.reply_type, DVDInterface::INT_TCINT, cycles_late,
                                       buffer);
}

void DSPCore_SetState(DSPCoreState new_state)
{
	core_state = new_state;
	// kick the event, in case we are waiting
	if (new_state == DSPCORE_RUNNING)
		step_event.Set();
	// Sleep(10);
	DSPHost::UpdateDebugger();
}

void WaitUntilIdle()
{
  ASSERT(Core::IsCPUThread());

  while (!s_request_queue.Empty())
    s_result_queue_expanded.Wait();

  StopDVDThread();
  StartDVDThread();
}

void DSPCore_SetState(State new_state)
{
  core_state = new_state;

  // kick the event, in case we are waiting
  if (new_state == State::Running)
    step_event.Set();

  Host::UpdateDebugger();
}

static void StopDVDThread()
{
  ASSERT(s_dvd_thread.joinable());

  // By setting s_DVD_thread_exiting, we ask the DVD thread to cleanly exit.
  // In case the request queue is empty, we need to set s_request_queue_expanded
  // so that the DVD thread will wake up and check s_DVD_thread_exiting.
  s_dvd_thread_exiting.Set();
  s_request_queue_expanded.Set();

  s_dvd_thread.join();
}