public bool Wait(GpuContext gpuContext, NvFence fence)
{
lock (Lock)
{
Fence = fence;
State = NvHostEventState.Waiting;
// NOTE: nvservices code should always wait on the GPU side.
// If we do this, we may get an abort or undefined behaviour when the GPU processing thread is blocked for a long period (for example, during shader compilation).
// The reason for this is that the NVN code will try to wait until giving up.
// This is done by trying to wait and signal multiple times until aborting after you are past the timeout.
// As such, if it fails too many time, we enforce a wait on the CPU side indefinitely.
// This allows to keep GPU and CPU in sync when we are slow.
if (_failingCount == FailingCountMax)
{
Logger.PrintWarning(LogClass.ServiceNv, "GPU processing thread is too slow, waiting on CPU...");
bool timedOut = Fence.Wait(gpuContext, Timeout.InfiniteTimeSpan);
GpuSignaled();
return(timedOut);
}
else
{
_waiterInformation = gpuContext.Synchronization.RegisterCallbackOnSyncpoint(Fence.Id, Fence.Value, GpuSignaled);
return(true);
}
}
}
public void Cancel(GpuContext gpuContext)
{
lock (Lock)
{
NvHostEventState oldState = State;
State = NvHostEventState.Cancelling;
if (oldState == NvHostEventState.Waiting && _waiterInformation != null)
{
gpuContext.Synchronization.UnregisterCallback(Fence.Id, _waiterInformation);
_waiterInformation = null;
if (_previousFailingFence.Id == Fence.Id && _previousFailingFence.Value == Fence.Value)
{
_failingCount++;
}
else
{
_failingCount = 1;
_previousFailingFence = Fence;
}
}
State = NvHostEventState.Cancelled;
Event.WritableEvent.Clear();
}
}
public void Wait(GpuContext gpuContext, NvFence fence)
{
Fence = fence;
State = NvHostEventState.Waiting;
_waiterInformation = gpuContext.Synchronization.RegisterCallbackOnSyncpoint(Fence.Id, Fence.Value, GpuSignaled);
}
private void GpuSignaled(SyncpointWaiterHandle waiterInformation)
{
lock (Lock)
{
// If the signal does not match our current waiter,
// then it is from a past fence and we should just ignore it.
if (waiterInformation != null && waiterInformation != _waiterInformation)
{
return;
}
ResetFailingState();
Signal();
}
}
