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// 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);
}