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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "runnable.h"
#include <thread>
#include <concepts>
namespace vespalib {
namespace thread {
[[nodiscard]] std::thread start(Runnable &runnable, Runnable::init_fun_t init_fun);
size_t as_zu(std::thread::id id);
}
/**
* Keeps track of multiple running threads. Calling join will join all
* currently running threads. All threads must be joined before
* destructing the pool itself. This class is not thread safe.
**/
class ThreadPool {
private:
std::vector<std::thread> _threads;
public:
ThreadPool() noexcept : _threads() {}
void start(Runnable &runnable, Runnable::init_fun_t init_fun) {
reserve(size() + 1);
_threads.push_back(thread::start(runnable, std::move(init_fun)));
}
template<typename F, typename... Args>
requires std::invocable<F,Args...>
void start(F &&f, Args && ... args) {
reserve(size() + 1);
_threads.emplace_back(std::forward<F>(f), std::forward<Args>(args)...);
};
void reserve(size_t capacity) { _threads.reserve(capacity); }
size_t size() const { return _threads.size(); }
bool empty() const { return _threads.empty(); }
void join() {
for (auto &thread: _threads) {
thread.join();
}
_threads.clear();
}
};
}
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