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// Copyright 2020 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.
#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"
namespace dawn {
namespace {
class PerThreadProcTests : public testing::Test {
public:
PerThreadProcTests()
: mNativeInstance(native::APICreateInstance(nullptr)),
mAdapterBase(mNativeInstance.Get(),
AcquireRef(new native::null::PhysicalDevice()),
native::FeatureLevel::Core,
native::TogglesState(native::ToggleStage::Adapter),
wgpu::PowerPreference::Undefined) {}
~PerThreadProcTests() override = default;
protected:
Ref<native::InstanceBase> mNativeInstance;
native::AdapterBase mAdapterBase;
};
// 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>(mAdapterBase.APICreateDevice()));
wgpu::Device deviceB =
wgpu::Device::Acquire(reinterpret_cast<WGPUDevice>(mAdapterBase.APICreateDevice()));
std::thread threadA([&] {
DawnProcTable procs = 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 = 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);
}
TEST_F(PerThreadProcTests, DispatchesDefaultThread) {
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 threadDefaultCounter = 0;
static int threadACounter = 0;
static std::atomic<std::thread::id> threadIdA;
static std::atomic<std::thread::id> threadIdB;
constexpr int kThreadATargetCount = 28347;
constexpr int kThreadBTargetCount = 40420;
{
DawnProcTable procs = native::GetProcs();
procs.deviceCreateBuffer = [](WGPUDevice device,
WGPUBufferDescriptor const* descriptor) -> WGPUBuffer {
EXPECT_EQ(std::this_thread::get_id(), threadIdB);
threadDefaultCounter++;
return nullptr;
};
dawnProcSetDefaultThreadProcs(&procs);
}
// Note: Acquire doesn't call reference or release.
wgpu::Device deviceA =
wgpu::Device::Acquire(reinterpret_cast<WGPUDevice>(mAdapterBase.APICreateDevice()));
wgpu::Device deviceB =
wgpu::Device::Acquire(reinterpret_cast<WGPUDevice>(mAdapterBase.APICreateDevice()));
std::thread threadA([&] {
DawnProcTable procs = 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([&] {
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(threadDefaultCounter, kThreadBTargetCount);
EXPECT_EQ(threadACounter, kThreadATargetCount);
dawnProcSetDefaultThreadProcs(nullptr);
dawnProcSetProcs(nullptr);
}
} // anonymous namespace
} // namespace dawn