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removed unused methods(BeginPlay, Tick) and added rider plugin

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Caleb Buhungiro
2025-07-05 15:04:21 +08:00
parent a98fd4b2a7
commit 58a7fc2f55
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unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
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9. Accepting Warranty or Additional Liability. While redistributing
the Work or Derivative Works thereof, You may choose to offer,
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Plugins/Developer/RiderLink/Source/RD/thirdparty/CTPL/README.md vendored Normal file
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CTPL
====
Modern and efficient C++ Thread Pool Library
A thread pool is a programming pattern for parallel execution of jobs, http://en.wikipedia.org/wiki/Thread_pool_pattern.
More specifically, there are some threads dedicated to the pool and a container of jobs. The jobs come to the pool dynamically. A job is fetched and deleted from the container when there is an idle thread. The job is then run on that thread.
A thread pool is helpful when you want to minimize time of loading and destroying threads and when you want to limit the number of parallel jobs that run simultanuasly. For example, time consuming event handlers may be processed in a thread pool to make UI more responsive.
Features:
- standard c++ language, tested to compile on MS Visual Studio 2013 (2012?), gcc 4.8.2 and mingw 4.8.1(with posix threads)
- simple but effiecient solution, one header only, no need to compile a binary library
- query the number of idle threads and resize the pool dynamically
- one API to push to the thread pool any collable object: lambdas, functors, functions, result of bind expression
- collable objects with variadic number of parameters plus index of the thread running the object
- automatic template argument deduction
- get returned value of any type with standard c++ futures
- get fired exceptions with standard c++ futures
- use for any purpose under Apache license
- two variants, one depends on Boost Lockfree Queue library, http://boost.org, which is a header only library
Sample usage
<code>void first(int id) {
std::cout << "hello from " << id << '\n';
}</code>
<code>&#32;&#32;struct Second {
void operator()(int id) const {
std::cout << "hello from " << id << '\n';
}
} second;
<code>void third(int id, const std::string & additional_param) {}</code>
<code>int main () {</code>
<code>&#32;&#32;&#32;&#32;ctpl::thread_pool p(2 /* two threads in the pool */);</code>
<code>&#32;&#32;&#32;&#32;p.push(first); // function</code>
<code>&#32;&#32;&#32;&#32;p.push(third, "additional_param");</code>
<code>&#32;&#32;&#32;&#32;p.push( &#91;&#93; (int id){
std::cout << "hello from " << id << '\n';
}); // lambda</code>
<code>&#32;&#32;&#32;&#32;p.push(std::ref(second)); // functor, reference</code>
<code>&#32;&#32;&#32;&#32;p.push(const_cast&#60;const Second &&#62;(second)); // functor, copy ctor</code>
<code>&#32;&#32;&#32;&#32;p.push(std::move(second)); // functor, move ctor</code>
<code>}</code>

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/*********************************************************
*
* Copyright (C) 2014 by Vitaliy Vitsentiy
*
* 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 __ctpl_stl_thread_pool_H__
#define __ctpl_stl_thread_pool_H__
#include <functional>
#include <thread>
#include <atomic>
#include <vector>
#include <memory>
#include <exception>
#include <future>
#include <mutex>
#include <queue>
// thread pool to run user's functors with signature
// ret func(int id, other_params)
// where id is the index of the thread that runs the functor
// ret is some return type
namespace ctpl {
namespace detail {
template <typename T>
class Queue {
public:
bool push(T const & value) {
std::unique_lock<std::mutex> lock(this->mutex);
this->q.push(value);
return true;
}
// deletes the retrieved element, do not use for non integral types
bool pop(T & v) {
std::unique_lock<std::mutex> lock(this->mutex);
if (this->q.empty())
return false;
v = this->q.front();
this->q.pop();
return true;
}
bool empty() {
std::unique_lock<std::mutex> lock(this->mutex);
return this->q.empty();
}
private:
std::queue<T> q;
std::mutex mutex;
};
}
class thread_pool {
public:
thread_pool() { this->init(); }
thread_pool(int nThreads) { this->init(); this->resize(nThreads); }
// the destructor waits for all the functions in the queue to be finished
~thread_pool() {
this->stop(true);
}
// get the number of running threads in the pool
int size() { return static_cast<int>(this->threads.size()); }
// number of idle threads
int n_idle() { return this->nWaiting; }
std::thread & get_thread(int i) { return *this->threads[i]; }
// change the number of threads in the pool
// should be called from one thread, otherwise be careful to not interleave, also with this->stop()
// nThreads must be >= 0
void resize(int nThreads) {
if (!this->isStop && !this->isDone) {
int oldNThreads = static_cast<int>(this->threads.size());
if (oldNThreads <= nThreads) { // if the number of threads is increased
this->threads.resize(nThreads);
this->flags.resize(nThreads);
for (int i = oldNThreads; i < nThreads; ++i) {
this->flags[i] = std::make_shared<std::atomic<bool>>(false);
this->set_thread(i);
}
}
else { // the number of threads is decreased
for (int i = oldNThreads - 1; i >= nThreads; --i) {
*this->flags[i] = true; // this thread will finish
this->threads[i]->detach();
}
{
// stop the detached threads that were waiting
std::unique_lock<std::mutex> lock(this->mutex);
this->cv.notify_all();
}
this->threads.resize(nThreads); // safe to delete because the threads are detached
this->flags.resize(nThreads); // safe to delete because the threads have copies of shared_ptr of the flags, not originals
}
}
}
// empty the queue
void clear_queue() {
std::function<void(int id)> * _f;
while (this->q.pop(_f))
delete _f; // empty the queue
}
// pops a functional wrapper to the original function
std::function<void(int)> pop() {
std::function<void(int id)> * _f = nullptr;
this->q.pop(_f);
std::unique_ptr<std::function<void(int id)>> func(_f); // at return, delete the function even if an exception occurred
std::function<void(int)> f;
if (_f)
f = *_f;
return f;
}
// wait for all computing threads to finish and stop all threads
// may be called asynchronously to not pause the calling thread while waiting
// if isWait == true, all the functions in the queue are run, otherwise the queue is cleared without running the functions
void stop(bool isWait = false) {
if (!isWait) {
if (this->isStop)
return;
this->isStop = true;
for (int i = 0, n = this->size(); i < n; ++i) {
*this->flags[i] = true; // command the threads to stop
}
this->clear_queue(); // empty the queue
}
else {
if (this->isDone || this->isStop)
return;
this->isDone = true; // give the waiting threads a command to finish
}
{
std::unique_lock<std::mutex> lock(this->mutex);
this->cv.notify_all(); // stop all waiting threads
}
for (int i = 0; i < static_cast<int>(this->threads.size()); ++i) { // wait for the computing threads to finish
if (this->threads[i]->joinable())
this->threads[i]->join();
}
// if there were no threads in the pool but some functors in the queue, the functors are not deleted by the threads
// therefore delete them here
this->clear_queue();
this->threads.clear();
this->flags.clear();
}
template<typename F, typename... Rest>
auto push(F && f, Rest&&... rest) ->std::future<decltype(f(0, rest...))> {
auto pck = std::make_shared<std::packaged_task<decltype(f(0, rest...))(int)>>(
std::bind(std::forward<F>(f), std::placeholders::_1, std::forward<Rest>(rest)...)
);
auto _f = new std::function<void(int id)>([pck](int id) {
(*pck)(id);
});
this->q.push(_f);
std::unique_lock<std::mutex> lock(this->mutex);
this->cv.notify_one();
return pck->get_future();
}
// run the user's function that excepts argument int - id of the running thread. returned value is templatized
// operator returns std::future, where the user can get the result and rethrow the catched exceptins
template<typename F>
auto push(F && f) ->std::future<decltype(f(0))> {
auto pck = std::make_shared<std::packaged_task<decltype(f(0))(int)>>(std::forward<F>(f));
auto _f = new std::function<void(int id)>([pck](int id) {
(*pck)(id);
});
this->q.push(_f);
std::unique_lock<std::mutex> lock(this->mutex);
this->cv.notify_one();
return pck->get_future();
}
private:
// deleted
thread_pool(const thread_pool &);// = delete;
thread_pool(thread_pool &&);// = delete;
thread_pool & operator=(const thread_pool &);// = delete;
thread_pool & operator=(thread_pool &&);// = delete;
void set_thread(int i) {
std::shared_ptr<std::atomic<bool>> flag(this->flags[i]); // a copy of the shared ptr to the flag
auto f = [this, i, flag/* a copy of the shared ptr to the flag */]() {
std::atomic<bool> & _flag = *flag;
std::function<void(int id)> * _f;
bool isPop = this->q.pop(_f);
while (true) {
while (isPop) { // if there is anything in the queue
std::unique_ptr<std::function<void(int id)>> func(_f); // at return, delete the function even if an exception occurred
(*_f)(i);
if (_flag)
return; // the thread is wanted to stop, return even if the queue is not empty yet
else
isPop = this->q.pop(_f);
}
// the queue is empty here, wait for the next command
std::unique_lock<std::mutex> lock(this->mutex);
++this->nWaiting;
this->cv.wait(lock, [this, &_f, &isPop, &_flag](){ isPop = this->q.pop(_f); return isPop || this->isDone || _flag; });
--this->nWaiting;
if (!isPop)
return; // if the queue is empty and this->isDone == true or *flag then return
}
};
this->threads[i].reset(new std::thread(f)); // compiler may not support std::make_unique()
}
void init() { this->nWaiting = 0; this->isStop = false; this->isDone = false; }
std::vector<std::unique_ptr<std::thread>> threads;
std::vector<std::shared_ptr<std::atomic<bool>>> flags;
detail::Queue<std::function<void(int id)> *> q;
std::atomic<bool> isDone;
std::atomic<bool> isStop;
std::atomic<int> nWaiting; // how many threads are waiting
std::mutex mutex;
std::condition_variable cv;
};
}
#endif // __ctpl_stl_thread_pool_H__