src/dawn/native/d3d/QueueD3D.cpp

// Copyright 2023 The Dawn & Tint Authors
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#include "dawn/native/d3d/QueueD3D.h"

#include <utility>

#include "dawn/native/WaitAnySystemEvent.h"

namespace dawn::native::d3d {

Queue::~Queue() = default;

ResultOrError<bool> Queue::WaitForQueueSerial(ExecutionSerial serial, Nanoseconds timeout) {
    ExecutionSerial completedSerial = GetCompletedCommandSerial();
    if (serial <= completedSerial) {
        return true;
    }

    auto receiver = mSystemEventReceivers->TakeOne(serial);
    if (!receiver) {
        // Anytime we may create an event, clear out any completed receivers so the list doesn't
        // grow forever.
        mSystemEventReceivers->ClearUpTo(completedSerial);

        HANDLE fenceEvent =
            ::CreateEvent(nullptr, /*bManualReset=*/true, /*bInitialState=*/false, nullptr);
        DAWN_INVALID_IF(fenceEvent == nullptr, "CreateEvent failed");
        SetEventOnCompletion(serial, fenceEvent);

        receiver = SystemEventReceiver(SystemHandle::Acquire(fenceEvent));
    }

    bool ready = false;
    std::array<std::pair<const dawn::native::SystemEventReceiver&, bool*>, 1> events{
        {{*receiver, &ready}}};
    DAWN_ASSERT(serial <= GetLastSubmittedCommandSerial());
    bool didComplete = WaitAnySystemEvent(events.begin(), events.end(), timeout);
    if (!didComplete) {
        // Return the SystemEventReceiver to the pool of receivers so it can be re-waited in the
        // future.
        mSystemEventReceivers->Enqueue(std::move(*receiver), serial);
    }
    return didComplete;
}

}  // namespace dawn::native::d3d