| // Copyright 2020 The Dawn Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include <atomic> |
| #include <thread> |
| |
| #include "gtest/gtest.h" |
| |
| #include "dawn/dawn_thread_dispatch_proc.h" |
| #include "dawn/native/DawnNative.h" |
| #include "dawn/native/Instance.h" |
| #include "dawn/native/null/DeviceNull.h" |
| #include "dawn/webgpu_cpp.h" |
| |
| class PerThreadProcTests : public testing::Test { |
| public: |
| PerThreadProcTests() |
| : mNativeInstance(dawn::native::InstanceBase::Create()), |
| mNativeAdapter(mNativeInstance.Get()) {} |
| ~PerThreadProcTests() override = default; |
| |
| protected: |
| Ref<dawn::native::InstanceBase> mNativeInstance; |
| dawn::native::null::Adapter mNativeAdapter; |
| }; |
| |
| // Test that procs can be set per thread. This test overrides deviceCreateBuffer with a placeholder |
| // proc for each thread that increments a counter. Because each thread has their own proc and |
| // counter, there should be no data races. The per-thread procs also check that the current thread |
| // id is exactly equal to the expected thread id. |
| TEST_F(PerThreadProcTests, DispatchesPerThread) { |
| dawnProcSetProcs(&dawnThreadDispatchProcTable); |
| |
| // Threads will block on this atomic to be sure we set procs on both threads before |
| // either thread calls the procs. |
| std::atomic<bool> ready(false); |
| |
| static int threadACounter = 0; |
| static int threadBCounter = 0; |
| |
| static std::atomic<std::thread::id> threadIdA; |
| static std::atomic<std::thread::id> threadIdB; |
| |
| constexpr int kThreadATargetCount = 28347; |
| constexpr int kThreadBTargetCount = 40420; |
| |
| // Note: Acquire doesn't call reference or release. |
| wgpu::Device deviceA = |
| wgpu::Device::Acquire(reinterpret_cast<WGPUDevice>(mNativeAdapter.APICreateDevice())); |
| |
| wgpu::Device deviceB = |
| wgpu::Device::Acquire(reinterpret_cast<WGPUDevice>(mNativeAdapter.APICreateDevice())); |
| |
| std::thread threadA([&]() { |
| DawnProcTable procs = dawn::native::GetProcs(); |
| procs.deviceCreateBuffer = [](WGPUDevice device, |
| WGPUBufferDescriptor const* descriptor) -> WGPUBuffer { |
| EXPECT_EQ(std::this_thread::get_id(), threadIdA); |
| threadACounter++; |
| return nullptr; |
| }; |
| dawnProcSetPerThreadProcs(&procs); |
| |
| while (!ready) { |
| } // Should be fast, so just spin. |
| |
| for (int i = 0; i < kThreadATargetCount; ++i) { |
| deviceA.CreateBuffer(nullptr); |
| } |
| |
| deviceA = nullptr; |
| dawnProcSetPerThreadProcs(nullptr); |
| }); |
| |
| std::thread threadB([&]() { |
| DawnProcTable procs = dawn::native::GetProcs(); |
| procs.deviceCreateBuffer = [](WGPUDevice device, |
| WGPUBufferDescriptor const* bufferDesc) -> WGPUBuffer { |
| EXPECT_EQ(std::this_thread::get_id(), threadIdB); |
| threadBCounter++; |
| return nullptr; |
| }; |
| dawnProcSetPerThreadProcs(&procs); |
| |
| while (!ready) { |
| } // Should be fast, so just spin. |
| |
| for (int i = 0; i < kThreadBTargetCount; ++i) { |
| deviceB.CreateBuffer(nullptr); |
| } |
| |
| deviceB = nullptr; |
| dawnProcSetPerThreadProcs(nullptr); |
| }); |
| |
| threadIdA = threadA.get_id(); |
| threadIdB = threadB.get_id(); |
| |
| ready = true; |
| threadA.join(); |
| threadB.join(); |
| |
| EXPECT_EQ(threadACounter, kThreadATargetCount); |
| EXPECT_EQ(threadBCounter, kThreadBTargetCount); |
| |
| dawnProcSetProcs(nullptr); |
| } |