C++ BlockingLoop::IsRunning方法代码示例

// The deterministic_gpu_thread version.
static void ReadDataFromFifoOnCPU(u32 readPtr)
{
	size_t len = 32;
	u8 *write_ptr = s_video_buffer_write_ptr;
	if (len > (size_t)(s_video_buffer + FIFO_SIZE - write_ptr))
	{
		// We can't wrap around while the GPU is working on the data.
		// This should be very rare due to the reset in SyncGPU.
		SyncGPU(SYNC_GPU_WRAPAROUND);
		if (!s_gpu_mainloop.IsRunning())
		{
			// GPU is shutting down, so the next asserts may fail
			return;
		}

		if (s_video_buffer_pp_read_ptr != s_video_buffer_read_ptr)
		{
			PanicAlert("desynced read pointers");
			return;
		}
		write_ptr = s_video_buffer_write_ptr;
		size_t existing_len = write_ptr - s_video_buffer_pp_read_ptr;
		if (len > (size_t)(FIFO_SIZE - existing_len))
		{
			PanicAlert("FIFO out of bounds (existing %lu + new %lu > %lu)", (unsigned long) existing_len, (unsigned long) len, (unsigned long) FIFO_SIZE);
			return;
		}
	}
	Memory::CopyFromEmu(s_video_buffer_write_ptr, readPtr, len);
	s_video_buffer_pp_read_ptr = OpcodeDecoder_Run<true>(DataReader(s_video_buffer_pp_read_ptr, write_ptr + len), nullptr, false);
	// This would have to be locked if the GPU thread didn't spin.
	s_video_buffer_write_ptr = write_ptr + len;
}

void SyncGPU(SyncGPUReason reason, bool may_move_read_ptr)
{
	if (g_use_deterministic_gpu_thread)
	{
		s_gpu_mainloop.Wait();
		if (!s_gpu_mainloop.IsRunning())
			return;

		// Opportunistically reset FIFOs so we don't wrap around.
		if (may_move_read_ptr && s_fifo_aux_write_ptr != s_fifo_aux_read_ptr)
			PanicAlert("aux fifo not synced (%p, %p)", s_fifo_aux_write_ptr, s_fifo_aux_read_ptr);

		memmove(s_fifo_aux_data, s_fifo_aux_read_ptr, s_fifo_aux_write_ptr - s_fifo_aux_read_ptr);
		s_fifo_aux_write_ptr -= (s_fifo_aux_read_ptr - s_fifo_aux_data);
		s_fifo_aux_read_ptr = s_fifo_aux_data;

		if (may_move_read_ptr)
		{
			u8* write_ptr = s_video_buffer_write_ptr;

			// what's left over in the buffer
			size_t size = write_ptr - s_video_buffer_pp_read_ptr;

			memmove(s_video_buffer, s_video_buffer_pp_read_ptr, size);
			// This change always decreases the pointers.  We write seen_ptr
			// after write_ptr here, and read it before in RunGpuLoop, so
			// 'write_ptr > seen_ptr' there cannot become spuriously true.
			s_video_buffer_write_ptr = write_ptr = s_video_buffer + size;
			s_video_buffer_pp_read_ptr = s_video_buffer;
			s_video_buffer_read_ptr = s_video_buffer;
			s_video_buffer_seen_ptr = write_ptr;
		}
	}
}

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

	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;
	s_video_buffer_seen_ptr = nullptr;
	s_fifo_aux_write_ptr = nullptr;
	s_fifo_aux_read_ptr = nullptr;
}

void PushFifoAuxBuffer(void* ptr, size_t size)
{
	if (size > (size_t) (s_fifo_aux_data + FIFO_SIZE - s_fifo_aux_write_ptr))
	{
		SyncGPU(SYNC_GPU_AUX_SPACE, /* may_move_read_ptr */ false);
		if (!s_gpu_mainloop.IsRunning())
		{
			// GPU is shutting down
			return;
		}
		if (size > (size_t) (s_fifo_aux_data + FIFO_SIZE - s_fifo_aux_write_ptr))
		{
			// That will sync us up to the last 32 bytes, so this short region
			// of FIFO would have to point to a 2MB display list or something.
			PanicAlert("absurdly large aux buffer");
			return;
		}
	}
	memcpy(s_fifo_aux_write_ptr, ptr, size);
	s_fifo_aux_write_ptr += size;
}