145 lines
2.8 KiB
C++
145 lines
2.8 KiB
C++
//
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// detail/posix_thread.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2025 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_DETAIL_POSIX_THREAD_HPP
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#define ASIO_DETAIL_POSIX_THREAD_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#if defined(ASIO_HAS_PTHREADS)
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#include <cstddef>
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#include <pthread.h>
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#include "asio/detail/memory.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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extern "C"
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{
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ASIO_DECL void* asio_detail_posix_thread_function(void* arg);
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}
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class posix_thread
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{
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public:
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// Construct in a non-joinable state.
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posix_thread() noexcept
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: arg_(0)
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{
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}
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// Constructor.
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template <typename Function>
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posix_thread(Function f, unsigned int = 0)
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: posix_thread(std::allocator_arg, std::allocator<void>(), f)
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{
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}
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// Construct with custom allocator.
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template <typename Allocator, typename Function>
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posix_thread(allocator_arg_t, const Allocator& a,
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Function f, unsigned int = 0)
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: arg_(start_thread(allocate_object<func<Function, Allocator>>(a, f, a)))
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{
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}
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// Move constructor.
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posix_thread(posix_thread&& other) noexcept
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: arg_(other.arg_)
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{
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other.arg_ = 0;
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}
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// Destructor.
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ASIO_DECL ~posix_thread();
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// Move assignment.
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posix_thread& operator=(posix_thread&& other) noexcept
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{
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arg_ = other.arg_;
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other.arg_ = 0;
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return *this;
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}
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// Whether the thread can be joined.
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bool joinable() const
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{
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return !!arg_;
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}
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// Wait for the thread to exit.
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ASIO_DECL void join();
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// Get number of CPUs.
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ASIO_DECL static std::size_t hardware_concurrency();
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private:
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friend void* asio_detail_posix_thread_function(void* arg);
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class func_base
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{
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public:
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virtual ~func_base() {}
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virtual void run() = 0;
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virtual void destroy() = 0;
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::pthread_t thread_;
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};
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template <typename Function, typename Allocator>
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class func
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: public func_base
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{
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public:
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func(Function f, const Allocator& a)
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: f_(f),
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allocator_(a)
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{
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}
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virtual void run()
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{
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f_();
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}
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virtual void destroy()
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{
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deallocate_object(allocator_, this);
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}
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private:
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Function f_;
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Allocator allocator_;
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};
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ASIO_DECL func_base* start_thread(func_base* arg);
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func_base* arg_;
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};
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#if defined(ASIO_HEADER_ONLY)
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# include "asio/detail/impl/posix_thread.ipp"
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#endif // defined(ASIO_HEADER_ONLY)
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#endif // defined(ASIO_HAS_PTHREADS)
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#endif // ASIO_DETAIL_POSIX_THREAD_HPP
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