Initial Commit

include/asio/detail/posix_thread.hpp

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