115 lines
2.0 KiB
C++
115 lines
2.0 KiB
C++
|
/*
|
||
|
|
* Copyright 2015-2017 ARM Limited
|
||
|
|
* SPDX-License-Identifier: Apache-2.0
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef SPIRV_CROSS_THREAD_GROUP_HPP
|
||
|
|
#define SPIRV_CROSS_THREAD_GROUP_HPP
|
||
|
|
|
||
|
|
#include <condition_variable>
|
||
|
|
#include <mutex>
|
||
|
|
#include <thread>
|
||
|
|
|
||
|
|
namespace spirv_cross
|
||
|
|
{
|
||
|
|
template <typename T, unsigned Size>
|
||
|
|
class ThreadGroup
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
ThreadGroup(T *impl)
|
||
|
|
{
|
||
|
|
for (unsigned i = 0; i < Size; i++)
|
||
|
|
workers[i].start(&impl[i]);
|
||
|
|
}
|
||
|
|
|
||
|
|
void run()
|
||
|
|
{
|
||
|
|
for (auto &worker : workers)
|
||
|
|
worker.run();
|
||
|
|
}
|
||
|
|
|
||
|
|
void wait()
|
||
|
|
{
|
||
|
|
for (auto &worker : workers)
|
||
|
|
worker.wait();
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
struct Thread
|
||
|
|
{
|
||
|
|
enum State
|
||
|
|
{
|
||
|
|
Idle,
|
||
|
|
Running,
|
||
|
|
Dying
|
||
|
|
};
|
||
|
|
State state = Idle;
|
||
|
|
|
||
|
|
void start(T *impl)
|
||
|
|
{
|
||
|
|
worker = std::thread([impl, this] {
|
||
|
|
for (;;)
|
||
|
|
{
|
||
|
|
{
|
||
|
|
std::unique_lock<std::mutex> l{ lock };
|
||
|
|
cond.wait(l, [this] { return state != Idle; });
|
||
|
|
if (state == Dying)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
impl->main();
|
||
|
|
|
||
|
|
std::lock_guard<std::mutex> l{ lock };
|
||
|
|
state = Idle;
|
||
|
|
cond.notify_one();
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
void wait()
|
||
|
|
{
|
||
|
|
std::unique_lock<std::mutex> l{ lock };
|
||
|
|
cond.wait(l, [this] { return state == Idle; });
|
||
|
|
}
|
||
|
|
|
||
|
|
void run()
|
||
|
|
{
|
||
|
|
std::lock_guard<std::mutex> l{ lock };
|
||
|
|
state = Running;
|
||
|
|
cond.notify_one();
|
||
|
|
}
|
||
|
|
|
||
|
|
~Thread()
|
||
|
|
{
|
||
|
|
if (worker.joinable())
|
||
|
|
{
|
||
|
|
{
|
||
|
|
std::lock_guard<std::mutex> l{ lock };
|
||
|
|
state = Dying;
|
||
|
|
cond.notify_one();
|
||
|
|
}
|
||
|
|
worker.join();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
std::thread worker;
|
||
|
|
std::condition_variable cond;
|
||
|
|
std::mutex lock;
|
||
|
|
};
|
||
|
|
Thread workers[Size];
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|