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// Copyright 2021 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 "dawn_platform/WorkerThread.h"
#include <future>
#include "common/Assert.h"
namespace {
class AsyncWaitableEvent final : public dawn_platform::WaitableEvent {
public:
explicit AsyncWaitableEvent(std::function<void()> func) {
mFuture = std::async(std::launch::async, func);
}
void Wait() override {
ASSERT(mFuture.valid());
mFuture.wait();
}
bool IsComplete() override {
ASSERT(mFuture.valid());
return mFuture.wait_for(std::chrono::seconds(0)) == std::future_status::ready;
}
private:
// It is safe not to call Wait() in the destructor of AsyncWaitableEvent because since
// C++14 the destructor of std::future will always be blocked until its state becomes
// std::future_status::ready when it was created by a call of std::async and it is the
// last reference to the shared state.
// See https://en.cppreference.com/w/cpp/thread/future/~future for more details.
std::future<void> mFuture;
};
} // anonymous namespace
std::unique_ptr<dawn_platform::WaitableEvent> AsyncWorkerThreadPool::PostWorkerTask(
dawn_platform::PostWorkerTaskCallback callback,
void* userdata) {
std::function<void()> doTask = [callback, userdata]() { callback(userdata); };
return std::make_unique<AsyncWaitableEvent>(doTask);
}