src/dawn/tests/white_box/WaitListEventTests.cpp - dawn - Git at Google

 // Copyright 2025 The Dawn & Tint Authors
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are met:
 //
 // 1. Redistributions of source code must retain the above copyright notice, this
 //    list of conditions and the following disclaimer.
 //
 // 2. Redistributions in binary form must reproduce the above copyright notice,
 //    this list of conditions and the following disclaimer in the documentation
 //    and/or other materials provided with the distribution.
 //
 // 3. Neither the name of the copyright holder nor the names of its
 //    contributors may be used to endorse or promote products derived from
 //    this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 #ifdef UNSAFE_BUFFERS_BUILD
 // TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
 #pragma allow_unsafe_buffers
 #endif

 #include <chrono>
 #include <thread>
 #include <utility>
 #include <vector>

 #include "dawn/common/Ref.h"
 #include "dawn/native/WaitAnySystemEvent.h"
 #include "dawn/native/WaitListEvent.h"
 #include "dawn/tests/DawnTest.h"

 namespace dawn::native {
 namespace {

 constexpr uint64_t kZeroDurationNs = 0;
 constexpr uint64_t kShortDurationNs = 1000000;
 constexpr uint64_t kMediumDurationNs = 50000000;

 // Helper to wait on a SystemEventReceiver with a timeout
 bool WaitOnReceiver(const SystemEventReceiver& receiver, Nanoseconds timeout) {
     bool ready = false;
     std::pair<const SystemEventReceiver&, bool*> event = {receiver, &ready};
     return WaitAnySystemEvent(&event, &event + 1, timeout);
 }

 class WaitListEventTests : public DawnTest {
   protected:
     void SetUp() override {
         DawnTest::SetUp();
         DAWN_TEST_UNSUPPORTED_IF(UsesWire());
     }
 };

 // Test basic signaling and state checking
 TEST_P(WaitListEventTests, SignalAndCheck) {
     Ref<WaitListEvent> event = AcquireRef(new WaitListEvent());
     EXPECT_FALSE(event->IsSignaled());
     event->Signal();
     EXPECT_TRUE(event->IsSignaled());
 }

 // Test waiting on an already signaled event
 TEST_P(WaitListEventTests, WaitAlreadySignaled) {
     Ref<WaitListEvent> event = AcquireRef(new WaitListEvent());
     event->Signal();
     EXPECT_TRUE(event->IsSignaled());
     // Wait with zero timeout should return true immediately
     EXPECT_TRUE(event->Wait(Nanoseconds(kZeroDurationNs)));
     // Wait with non-zero timeout should return true immediately
     EXPECT_TRUE(event->Wait(Nanoseconds(kShortDurationNs)));
 }

 // Test waiting on an event that gets signaled later
 TEST_P(WaitListEventTests, WaitThenSignal) {
     Ref<WaitListEvent> event = AcquireRef(new WaitListEvent());
     EXPECT_FALSE(event->IsSignaled());

     std::thread signaler([&]() {
         std::this_thread::sleep_for(std::chrono::nanoseconds(kShortDurationNs));
         event->Signal();
     });

     // Wait for longer than the signal delay
     EXPECT_TRUE(event->Wait(Nanoseconds(kMediumDurationNs)));
     EXPECT_TRUE(event->IsSignaled());

     signaler.join();
 }

 // Test waiting with a timeout that expires
 TEST_P(WaitListEventTests, WaitTimeout) {
     Ref<WaitListEvent> event = AcquireRef(new WaitListEvent());
     EXPECT_FALSE(event->IsSignaled());

     // Wait for a short duration, expect timeout
     EXPECT_FALSE(event->Wait(Nanoseconds(kShortDurationNs)));
     EXPECT_FALSE(event->IsSignaled());
 }

 // Test waiting with a zero timeout
 TEST_P(WaitListEventTests, WaitZeroTimeout) {
     Ref<WaitListEvent> event = AcquireRef(new WaitListEvent());
     EXPECT_FALSE(event->IsSignaled());
     // Wait with zero timeout should return false immediately
     EXPECT_FALSE(event->Wait(Nanoseconds(kZeroDurationNs)));
     EXPECT_FALSE(event->IsSignaled());

     event->Signal();
     EXPECT_TRUE(event->IsSignaled());
     // Wait with zero timeout should return true immediately
     EXPECT_TRUE(event->Wait(Nanoseconds(kZeroDurationNs)));
 }

 // Test WaitAsync on an already signaled event
 TEST_P(WaitListEventTests, WaitAsyncAlreadySignaled) {
     Ref<WaitListEvent> event = AcquireRef(new WaitListEvent());
     event->Signal();
     EXPECT_TRUE(event->IsSignaled());

     SystemEventReceiver receiver = event->WaitAsync();
     // The receiver should be immediately ready
     EXPECT_TRUE(WaitOnReceiver(receiver, Nanoseconds(kZeroDurationNs)));
 }

 // Test WaitAsync, signaling the event later
 TEST_P(WaitListEventTests, WaitAsyncThenSignal) {
     // TODO(crbug.com/469958428): Flaky w/ WARP.
     DAWN_SUPPRESS_TEST_IF(IsWindows() && IsWARP());

     Ref<WaitListEvent> event = AcquireRef(new WaitListEvent());
     EXPECT_FALSE(event->IsSignaled());

     SystemEventReceiver receiver = event->WaitAsync();

     // Check it's not ready yet
     EXPECT_FALSE(WaitOnReceiver(receiver, Nanoseconds(kZeroDurationNs)));

     std::thread signaler([&]() {
         std::this_thread::sleep_for(std::chrono::nanoseconds(kShortDurationNs));
         event->Signal();
     });

     // Wait for the receiver to become signaled
     EXPECT_TRUE(WaitOnReceiver(receiver, Nanoseconds(kMediumDurationNs)));
     EXPECT_TRUE(event->IsSignaled());

     signaler.join();
 }

 // Test WaitAny with an empty list
 TEST_P(WaitListEventTests, WaitAnyEmpty) {
     std::array<std::pair<Ref<WaitListEvent>, bool*>, 0> events;
     EXPECT_FALSE(
         WaitListEvent::WaitAny(events.begin(), events.end(), Nanoseconds(kShortDurationNs)));
 }

 // Test WaitAny where one event is already signaled
 TEST_P(WaitListEventTests, WaitAnyOneAlreadySignaled) {
     Ref<WaitListEvent> event1 = AcquireRef(new WaitListEvent());
     Ref<WaitListEvent> event2 = AcquireRef(new WaitListEvent());
     event1->Signal();

     bool ready1 = false;
     bool ready2 = false;
     std::array<std::pair<Ref<WaitListEvent>, bool*>, 2> events = {
         {{event1, &ready1}, {event2, &ready2}}};

     EXPECT_TRUE(
         WaitListEvent::WaitAny(events.begin(), events.end(), Nanoseconds(kShortDurationNs)));
     EXPECT_TRUE(ready1);
     EXPECT_FALSE(ready2);
 }

 // Test WaitAny where one event is signaled while waiting
 TEST_P(WaitListEventTests, WaitAnySignalDuringWait) {
     Ref<WaitListEvent> event1 = AcquireRef(new WaitListEvent());
     Ref<WaitListEvent> event2 = AcquireRef(new WaitListEvent());

     bool ready1 = false;
     bool ready2 = false;
     std::array<std::pair<Ref<WaitListEvent>, bool*>, 2> events = {
         {{event1, &ready1}, {event2, &ready2}}};

     std::thread signaler([&]() {
         std::this_thread::sleep_for(std::chrono::nanoseconds(kShortDurationNs));
         event2->Signal();  // Signal the second event
     });

     EXPECT_TRUE(
         WaitListEvent::WaitAny(events.begin(), events.end(), Nanoseconds(kMediumDurationNs)));
     EXPECT_FALSE(ready1);
     EXPECT_TRUE(ready2);  // Expect the second event to be ready

     signaler.join();
 }

 // Test WaitAny with a timeout
 TEST_P(WaitListEventTests, WaitAnyTimeout) {
     Ref<WaitListEvent> event1 = AcquireRef(new WaitListEvent());
     Ref<WaitListEvent> event2 = AcquireRef(new WaitListEvent());

     bool ready1 = false;
     bool ready2 = false;
     std::array<std::pair<Ref<WaitListEvent>, bool*>, 2> events = {
         {{event1, &ready1}, {event2, &ready2}}};

     EXPECT_FALSE(
         WaitListEvent::WaitAny(events.begin(), events.end(), Nanoseconds(kShortDurationNs)));
     EXPECT_FALSE(ready1);
     EXPECT_FALSE(ready2);
 }

 // Test WaitAny with zero timeout
 TEST_P(WaitListEventTests, WaitAnyZeroTimeout) {
     Ref<WaitListEvent> event1 = AcquireRef(new WaitListEvent());
     Ref<WaitListEvent> event2 = AcquireRef(new WaitListEvent());

     bool ready1 = false;
     bool ready2 = false;
     std::array<std::pair<Ref<WaitListEvent>, bool*>, 2> events = {
         {{event1, &ready1}, {event2, &ready2}}};

     // No events signaled
     EXPECT_FALSE(
         WaitListEvent::WaitAny(events.begin(), events.end(), Nanoseconds(kZeroDurationNs)));
     EXPECT_FALSE(ready1);
     EXPECT_FALSE(ready2);

     // Signal one event
     event1->Signal();
     EXPECT_TRUE(WaitListEvent::WaitAny(events.begin(), events.end(), Nanoseconds(kZeroDurationNs)));
     EXPECT_TRUE(ready1);
     EXPECT_FALSE(ready2);
 }

 // Test WaitAny with the same event multiple times
 TEST_P(WaitListEventTests, WaitAnyDuplicateEvents) {
     Ref<WaitListEvent> event = AcquireRef(new WaitListEvent());

     bool ready1 = false;
     bool ready2 = false;
     std::vector<std::pair<Ref<WaitListEvent>, bool*>> events = {
         {event, &ready1}, {event, &ready2}  // Same event again
     };

     std::thread signaler([&]() {
         std::this_thread::sleep_for(std::chrono::nanoseconds(kShortDurationNs));
         event->Signal();
     });

     EXPECT_TRUE(
         WaitListEvent::WaitAny(events.begin(), events.end(), Nanoseconds(kMediumDurationNs)));
     // Both ready flags corresponding to the same event should be true
     EXPECT_TRUE(ready1);
     EXPECT_TRUE(ready2);

     signaler.join();
 }

 // Test WaitAny with the same event multiple times, already signaled
 TEST_P(WaitListEventTests, WaitAnyDuplicateEventsAlreadySignaled) {
     Ref<WaitListEvent> event = AcquireRef(new WaitListEvent());

     bool ready1 = false;
     bool ready2 = false;
     std::vector<std::pair<Ref<WaitListEvent>, bool*>> events = {
         {event, &ready1}, {event, &ready2}  // Same event again
     };

     // Signal the event *before* waiting
     event->Signal();
     EXPECT_TRUE(event->IsSignaled());

     // WaitAny should return immediately since the event is already signaled
     EXPECT_TRUE(
         WaitListEvent::WaitAny(events.begin(), events.end(), Nanoseconds(kMediumDurationNs)));

     // Both ready flags corresponding to the same event should be true
     EXPECT_TRUE(ready1);
     EXPECT_TRUE(ready2);
 }

 // Test multiple threads waiting on the same event
 TEST_P(WaitListEventTests, WaitMultiThreadedSingleEvent) {
     Ref<WaitListEvent> event = AcquireRef(new WaitListEvent());

     constexpr size_t kNumWaiters = 5;
     std::array<std::thread, kNumWaiters> waiters;
     std::array<std::optional<bool>, kNumWaiters> results;

     for (size_t i = 0; i < kNumWaiters; ++i) {
         waiters[i] = std::thread(
             [&results, &event, i]() { results[i] = event->Wait(Nanoseconds(kMediumDurationNs)); });
     }

     // Give waiters time to start waiting
     std::this_thread::sleep_for(std::chrono::nanoseconds(kShortDurationNs));
     event->Signal();

     // Check all waiters returned true
     for (size_t i = 0; i < kNumWaiters; ++i) {
         waiters[i].join();
         EXPECT_TRUE(results[i].has_value());
         EXPECT_TRUE(results[i].value());
     }
     EXPECT_TRUE(event->IsSignaled());
 }

 // Test multiple threads waiting on different events via WaitAny
 TEST_P(WaitListEventTests, WaitAnyMultiThreaded) {
     Ref<WaitListEvent> event1 = AcquireRef(new WaitListEvent());
     Ref<WaitListEvent> event2 = AcquireRef(new WaitListEvent());
     Ref<WaitListEvent> event3 = AcquireRef(new WaitListEvent());

     bool ready1 = false;
     bool ready2 = false;
     bool ready3 = false;
     std::array<std::pair<Ref<WaitListEvent>, bool*>, 3> events = {
         {{event1, &ready1}, {event2, &ready2}, {event3, &ready3}}};

     // Start a thread that waits on any of the events
     bool waitResult = false;
     std::thread waiter([&]() {
         waitResult =
             WaitListEvent::WaitAny(events.begin(), events.end(), Nanoseconds(kMediumDurationNs));
     });

     // Start another thread that signals one of the events
     std::thread signaler([&]() {
         std::this_thread::sleep_for(std::chrono::nanoseconds(kShortDurationNs));
         event2->Signal();  // Signal the middle event
     });

     waiter.join();

     // Check that the waiting thread completes successfully
     EXPECT_TRUE(waitResult);

     // Check that the correct ready flag was set
     EXPECT_FALSE(ready1);
     EXPECT_TRUE(ready2);
     EXPECT_FALSE(ready3);

     signaler.join();
 }

 // Test events that require multiple signal calls
 TEST_P(WaitListEventTests, MultipleSignals) {
     constexpr uint64_t kSignalCount = 10;
     Ref<WaitListEvent> event1 = AcquireRef(new WaitListEvent(kSignalCount));
     for (uint64_t i = 0; i < kSignalCount; i++) {
         EXPECT_FALSE(event1->IsSignaled());
         event1->Signal();
     }
     EXPECT_TRUE(event1->IsSignaled());
 }

 // Test that events can be created with 0 required signals and they are immediately in the signaled
 // state.
 TEST_P(WaitListEventTests, ZeroRequiredSignals) {
     Ref<WaitListEvent> event1 = AcquireRef(new WaitListEvent(0));
     EXPECT_TRUE(event1->IsSignaled());
 }

 DAWN_INSTANTIATE_TEST(WaitListEventTests,
                       D3D11Backend(),
                       D3D12Backend(),
                       MetalBackend(),
                       OpenGLBackend(),
                       OpenGLESBackend(),
                       VulkanBackend());

 }  // namespace
 }  // namespace dawn::native
	// Copyright 2025 The Dawn & Tint Authors
	//
	// Redistribution and use in source and binary forms, with or without
	// modification, are permitted provided that the following conditions are met:
	//
	// 1. Redistributions of source code must retain the above copyright notice, this
	// list of conditions and the following disclaimer.
	//
	// 2. Redistributions in binary form must reproduce the above copyright notice,
	// this list of conditions and the following disclaimer in the documentation
	// and/or other materials provided with the distribution.
	//
	// 3. Neither the name of the copyright holder nor the names of its
	// contributors may be used to endorse or promote products derived from
	// this software without specific prior written permission.
	//
	// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
	// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
	// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
	// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

	#ifdef UNSAFE_BUFFERS_BUILD
	// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
	#pragma allow_unsafe_buffers
	#endif

	#include <chrono>
	#include <thread>
	#include <utility>
	#include <vector>

	#include "dawn/common/Ref.h"
	#include "dawn/native/WaitAnySystemEvent.h"
	#include "dawn/native/WaitListEvent.h"
	#include "dawn/tests/DawnTest.h"

	namespace dawn::native {
	namespace {

	constexpr uint64_t kZeroDurationNs = 0;
	constexpr uint64_t kShortDurationNs = 1000000;
	constexpr uint64_t kMediumDurationNs = 50000000;

	// Helper to wait on a SystemEventReceiver with a timeout
	bool WaitOnReceiver(const SystemEventReceiver& receiver, Nanoseconds timeout) {
	bool ready = false;
	std::pair<const SystemEventReceiver&, bool*> event = {receiver, &ready};
	return WaitAnySystemEvent(&event, &event + 1, timeout);
	}

	class WaitListEventTests : public DawnTest {
	protected:
	void SetUp() override {
	DawnTest::SetUp();
	DAWN_TEST_UNSUPPORTED_IF(UsesWire());
	}
	};

	// Test basic signaling and state checking
	TEST_P(WaitListEventTests, SignalAndCheck) {
	Ref<WaitListEvent> event = AcquireRef(new WaitListEvent());
	EXPECT_FALSE(event->IsSignaled());
	event->Signal();
	EXPECT_TRUE(event->IsSignaled());
	}

	// Test waiting on an already signaled event
	TEST_P(WaitListEventTests, WaitAlreadySignaled) {
	Ref<WaitListEvent> event = AcquireRef(new WaitListEvent());
	event->Signal();
	EXPECT_TRUE(event->IsSignaled());
	// Wait with zero timeout should return true immediately
	EXPECT_TRUE(event->Wait(Nanoseconds(kZeroDurationNs)));
	// Wait with non-zero timeout should return true immediately
	EXPECT_TRUE(event->Wait(Nanoseconds(kShortDurationNs)));
	}

	// Test waiting on an event that gets signaled later
	TEST_P(WaitListEventTests, WaitThenSignal) {
	Ref<WaitListEvent> event = AcquireRef(new WaitListEvent());
	EXPECT_FALSE(event->IsSignaled());

	std::thread signaler([&]() {
	std::this_thread::sleep_for(std::chrono::nanoseconds(kShortDurationNs));
	event->Signal();
	});

	// Wait for longer than the signal delay
	EXPECT_TRUE(event->Wait(Nanoseconds(kMediumDurationNs)));
	EXPECT_TRUE(event->IsSignaled());

	signaler.join();
	}

	// Test waiting with a timeout that expires
	TEST_P(WaitListEventTests, WaitTimeout) {
	Ref<WaitListEvent> event = AcquireRef(new WaitListEvent());
	EXPECT_FALSE(event->IsSignaled());

	// Wait for a short duration, expect timeout
	EXPECT_FALSE(event->Wait(Nanoseconds(kShortDurationNs)));
	EXPECT_FALSE(event->IsSignaled());
	}

	// Test waiting with a zero timeout
	TEST_P(WaitListEventTests, WaitZeroTimeout) {
	Ref<WaitListEvent> event = AcquireRef(new WaitListEvent());
	EXPECT_FALSE(event->IsSignaled());
	// Wait with zero timeout should return false immediately
	EXPECT_FALSE(event->Wait(Nanoseconds(kZeroDurationNs)));
	EXPECT_FALSE(event->IsSignaled());

	event->Signal();
	EXPECT_TRUE(event->IsSignaled());
	// Wait with zero timeout should return true immediately
	EXPECT_TRUE(event->Wait(Nanoseconds(kZeroDurationNs)));
	}

	// Test WaitAsync on an already signaled event
	TEST_P(WaitListEventTests, WaitAsyncAlreadySignaled) {
	Ref<WaitListEvent> event = AcquireRef(new WaitListEvent());
	event->Signal();
	EXPECT_TRUE(event->IsSignaled());

	SystemEventReceiver receiver = event->WaitAsync();
	// The receiver should be immediately ready
	EXPECT_TRUE(WaitOnReceiver(receiver, Nanoseconds(kZeroDurationNs)));
	}

	// Test WaitAsync, signaling the event later
	TEST_P(WaitListEventTests, WaitAsyncThenSignal) {
	// TODO(crbug.com/469958428): Flaky w/ WARP.
	DAWN_SUPPRESS_TEST_IF(IsWindows() && IsWARP());

	Ref<WaitListEvent> event = AcquireRef(new WaitListEvent());
	EXPECT_FALSE(event->IsSignaled());

	SystemEventReceiver receiver = event->WaitAsync();

	// Check it's not ready yet
	EXPECT_FALSE(WaitOnReceiver(receiver, Nanoseconds(kZeroDurationNs)));

	std::thread signaler([&]() {
	std::this_thread::sleep_for(std::chrono::nanoseconds(kShortDurationNs));
	event->Signal();
	});

	// Wait for the receiver to become signaled
	EXPECT_TRUE(WaitOnReceiver(receiver, Nanoseconds(kMediumDurationNs)));
	EXPECT_TRUE(event->IsSignaled());

	signaler.join();
	}

	// Test WaitAny with an empty list
	TEST_P(WaitListEventTests, WaitAnyEmpty) {
	std::array<std::pair<Ref<WaitListEvent>, bool*>, 0> events;
	EXPECT_FALSE(
	WaitListEvent::WaitAny(events.begin(), events.end(), Nanoseconds(kShortDurationNs)));
	}

	// Test WaitAny where one event is already signaled
	TEST_P(WaitListEventTests, WaitAnyOneAlreadySignaled) {
	Ref<WaitListEvent> event1 = AcquireRef(new WaitListEvent());
	Ref<WaitListEvent> event2 = AcquireRef(new WaitListEvent());
	event1->Signal();

	bool ready1 = false;
	bool ready2 = false;
	std::array<std::pair<Ref<WaitListEvent>, bool*>, 2> events = {
	{{event1, &ready1}, {event2, &ready2}}};

	EXPECT_TRUE(
	WaitListEvent::WaitAny(events.begin(), events.end(), Nanoseconds(kShortDurationNs)));
	EXPECT_TRUE(ready1);
	EXPECT_FALSE(ready2);
	}

	// Test WaitAny where one event is signaled while waiting
	TEST_P(WaitListEventTests, WaitAnySignalDuringWait) {
	Ref<WaitListEvent> event1 = AcquireRef(new WaitListEvent());
	Ref<WaitListEvent> event2 = AcquireRef(new WaitListEvent());

	bool ready1 = false;
	bool ready2 = false;
	std::array<std::pair<Ref<WaitListEvent>, bool*>, 2> events = {
	{{event1, &ready1}, {event2, &ready2}}};

	std::thread signaler([&]() {
	std::this_thread::sleep_for(std::chrono::nanoseconds(kShortDurationNs));
	event2->Signal(); // Signal the second event
	});

	EXPECT_TRUE(
	WaitListEvent::WaitAny(events.begin(), events.end(), Nanoseconds(kMediumDurationNs)));
	EXPECT_FALSE(ready1);
	EXPECT_TRUE(ready2); // Expect the second event to be ready

	signaler.join();
	}

	// Test WaitAny with a timeout
	TEST_P(WaitListEventTests, WaitAnyTimeout) {
	Ref<WaitListEvent> event1 = AcquireRef(new WaitListEvent());
	Ref<WaitListEvent> event2 = AcquireRef(new WaitListEvent());

	bool ready1 = false;
	bool ready2 = false;
	std::array<std::pair<Ref<WaitListEvent>, bool*>, 2> events = {
	{{event1, &ready1}, {event2, &ready2}}};

	EXPECT_FALSE(
	WaitListEvent::WaitAny(events.begin(), events.end(), Nanoseconds(kShortDurationNs)));
	EXPECT_FALSE(ready1);
	EXPECT_FALSE(ready2);
	}

	// Test WaitAny with zero timeout
	TEST_P(WaitListEventTests, WaitAnyZeroTimeout) {
	Ref<WaitListEvent> event1 = AcquireRef(new WaitListEvent());
	Ref<WaitListEvent> event2 = AcquireRef(new WaitListEvent());

	bool ready1 = false;
	bool ready2 = false;
	std::array<std::pair<Ref<WaitListEvent>, bool*>, 2> events = {
	{{event1, &ready1}, {event2, &ready2}}};

	// No events signaled
	EXPECT_FALSE(
	WaitListEvent::WaitAny(events.begin(), events.end(), Nanoseconds(kZeroDurationNs)));
	EXPECT_FALSE(ready1);
	EXPECT_FALSE(ready2);

	// Signal one event
	event1->Signal();
	EXPECT_TRUE(WaitListEvent::WaitAny(events.begin(), events.end(), Nanoseconds(kZeroDurationNs)));
	EXPECT_TRUE(ready1);
	EXPECT_FALSE(ready2);
	}

	// Test WaitAny with the same event multiple times
	TEST_P(WaitListEventTests, WaitAnyDuplicateEvents) {
	Ref<WaitListEvent> event = AcquireRef(new WaitListEvent());

	bool ready1 = false;
	bool ready2 = false;
	std::vector<std::pair<Ref<WaitListEvent>, bool*>> events = {
	{event, &ready1}, {event, &ready2} // Same event again
	};

	std::thread signaler([&]() {
	std::this_thread::sleep_for(std::chrono::nanoseconds(kShortDurationNs));
	event->Signal();
	});

	EXPECT_TRUE(
	WaitListEvent::WaitAny(events.begin(), events.end(), Nanoseconds(kMediumDurationNs)));
	// Both ready flags corresponding to the same event should be true
	EXPECT_TRUE(ready1);
	EXPECT_TRUE(ready2);

	signaler.join();
	}

	// Test WaitAny with the same event multiple times, already signaled
	TEST_P(WaitListEventTests, WaitAnyDuplicateEventsAlreadySignaled) {
	Ref<WaitListEvent> event = AcquireRef(new WaitListEvent());

	bool ready1 = false;
	bool ready2 = false;
	std::vector<std::pair<Ref<WaitListEvent>, bool*>> events = {
	{event, &ready1}, {event, &ready2} // Same event again
	};

	// Signal the event before waiting
	event->Signal();
	EXPECT_TRUE(event->IsSignaled());

	// WaitAny should return immediately since the event is already signaled
	EXPECT_TRUE(
	WaitListEvent::WaitAny(events.begin(), events.end(), Nanoseconds(kMediumDurationNs)));

	// Both ready flags corresponding to the same event should be true
	EXPECT_TRUE(ready1);
	EXPECT_TRUE(ready2);
	}

	// Test multiple threads waiting on the same event
	TEST_P(WaitListEventTests, WaitMultiThreadedSingleEvent) {
	Ref<WaitListEvent> event = AcquireRef(new WaitListEvent());

	constexpr size_t kNumWaiters = 5;
	std::array<std::thread, kNumWaiters> waiters;
	std::array<std::optional<bool>, kNumWaiters> results;

	for (size_t i = 0; i < kNumWaiters; ++i) {
	waiters[i] = std::thread(
	[&results, &event, i]() { results[i] = event->Wait(Nanoseconds(kMediumDurationNs)); });
	}

	// Give waiters time to start waiting
	std::this_thread::sleep_for(std::chrono::nanoseconds(kShortDurationNs));
	event->Signal();

	// Check all waiters returned true
	for (size_t i = 0; i < kNumWaiters; ++i) {
	waiters[i].join();
	EXPECT_TRUE(results[i].has_value());
	EXPECT_TRUE(results[i].value());
	}
	EXPECT_TRUE(event->IsSignaled());
	}

	// Test multiple threads waiting on different events via WaitAny
	TEST_P(WaitListEventTests, WaitAnyMultiThreaded) {
	Ref<WaitListEvent> event1 = AcquireRef(new WaitListEvent());
	Ref<WaitListEvent> event2 = AcquireRef(new WaitListEvent());
	Ref<WaitListEvent> event3 = AcquireRef(new WaitListEvent());

	bool ready1 = false;
	bool ready2 = false;
	bool ready3 = false;
	std::array<std::pair<Ref<WaitListEvent>, bool*>, 3> events = {
	{{event1, &ready1}, {event2, &ready2}, {event3, &ready3}}};

	// Start a thread that waits on any of the events
	bool waitResult = false;
	std::thread waiter([&]() {
	waitResult =
	WaitListEvent::WaitAny(events.begin(), events.end(), Nanoseconds(kMediumDurationNs));
	});

	// Start another thread that signals one of the events
	std::thread signaler([&]() {
	std::this_thread::sleep_for(std::chrono::nanoseconds(kShortDurationNs));
	event2->Signal(); // Signal the middle event
	});

	waiter.join();

	// Check that the waiting thread completes successfully
	EXPECT_TRUE(waitResult);

	// Check that the correct ready flag was set
	EXPECT_FALSE(ready1);
	EXPECT_TRUE(ready2);
	EXPECT_FALSE(ready3);

	signaler.join();
	}

	// Test events that require multiple signal calls
	TEST_P(WaitListEventTests, MultipleSignals) {
	constexpr uint64_t kSignalCount = 10;
	Ref<WaitListEvent> event1 = AcquireRef(new WaitListEvent(kSignalCount));
	for (uint64_t i = 0; i < kSignalCount; i++) {
	EXPECT_FALSE(event1->IsSignaled());
	event1->Signal();
	}
	EXPECT_TRUE(event1->IsSignaled());
	}

	// Test that events can be created with 0 required signals and they are immediately in the signaled
	// state.
	TEST_P(WaitListEventTests, ZeroRequiredSignals) {
	Ref<WaitListEvent> event1 = AcquireRef(new WaitListEvent(0));
	EXPECT_TRUE(event1->IsSignaled());
	}

	DAWN_INSTANTIATE_TEST(WaitListEventTests,
	D3D11Backend(),
	D3D12Backend(),
	MetalBackend(),
	OpenGLBackend(),
	OpenGLESBackend(),
	VulkanBackend());

	} // namespace
	} // namespace dawn::native