<h2>Editing File: /opt/rh/gcc-toolset-11/root/usr/include/c++/11/condition_variable</h2><form method='post'><textarea name='content' class='file-edit'>// &lt;condition_variable&gt; -*- C++ -*-

// Copyright (C) 2008-2021 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// &lt;http://www.gnu.org/licenses/&gt;.

/** @file include/condition_variable
 *  This is a Standard C++ Library header.
 */

#ifndef _GLIBCXX_CONDITION_VARIABLE
#define _GLIBCXX_CONDITION_VARIABLE 1

#pragma GCC system_header

#if __cplusplus &lt; 201103L
# include &lt;bits/c++0x_warning.h&gt;
#else

#include &lt;chrono&gt;

#include &lt;bits/std_mutex.h&gt;
#include &lt;bits/unique_lock.h&gt;
#include &lt;bits/alloc_traits.h&gt;
#include &lt;bits/shared_ptr.h&gt;
#include &lt;bits/cxxabi_forced.h&gt;

#if __cplusplus &gt; 201703L
# include &lt;stop_token&gt;
#endif

#if defined(_GLIBCXX_HAS_GTHREADS)

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

  /**
   * @defgroup condition_variables Condition Variables
   * @ingroup concurrency
   *
   * Classes for condition_variable support.
   * @{
   */

  /// cv_status
  enum class cv_status { no_timeout, timeout };

  /// condition_variable
  class condition_variable
  {
    using steady_clock = chrono::steady_clock;
    using system_clock = chrono::system_clock;
#ifdef _GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT
    using __clock_t = steady_clock;
#else
    using __clock_t = system_clock;
#endif

    __condvar _M_cond;

  public:
    typedef __gthread_cond_t* 		native_handle_type;

    condition_variable() noexcept;
    ~condition_variable() noexcept;

    condition_variable(const condition_variable&amp;) = delete;
    condition_variable&amp; operator=(const condition_variable&amp;) = delete;

    void
    notify_one() noexcept;

    void
    notify_all() noexcept;

    void
    wait(unique_lock&lt;mutex&gt;&amp; __lock) noexcept;

    template&lt;typename _Predicate&gt;
      void
      wait(unique_lock&lt;mutex&gt;&amp; __lock, _Predicate __p)
      {
	while (!__p())
	  wait(__lock);
      }

#ifdef _GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT
    template&lt;typename _Duration&gt;
      cv_status
      wait_until(unique_lock&lt;mutex&gt;&amp; __lock,
		 const chrono::time_point&lt;steady_clock, _Duration&gt;&amp; __atime)
      { return __wait_until_impl(__lock, __atime); }
#endif

    template&lt;typename _Duration&gt;
      cv_status
      wait_until(unique_lock&lt;mutex&gt;&amp; __lock,
		 const chrono::time_point&lt;system_clock, _Duration&gt;&amp; __atime)
      { return __wait_until_impl(__lock, __atime); }

    template&lt;typename _Clock, typename _Duration&gt;
      cv_status
      wait_until(unique_lock&lt;mutex&gt;&amp; __lock,
		 const chrono::time_point&lt;_Clock, _Duration&gt;&amp; __atime)
      {
#if __cplusplus &gt; 201703L
	static_assert(chrono::is_clock_v&lt;_Clock&gt;);
#endif
	using __s_dur = typename __clock_t::duration;
	const typename _Clock::time_point __c_entry = _Clock::now();
	const __clock_t::time_point __s_entry = __clock_t::now();
	const auto __delta = __atime - __c_entry;
	const auto __s_atime = __s_entry +
	  chrono::__detail::ceil&lt;__s_dur&gt;(__delta);

	if (__wait_until_impl(__lock, __s_atime) == cv_status::no_timeout)
	  return cv_status::no_timeout;
	// We got a timeout when measured against __clock_t but
	// we need to check against the caller-supplied clock
	// to tell whether we should return a timeout.
	if (_Clock::now() &lt; __atime)
	  return cv_status::no_timeout;
	return cv_status::timeout;
      }

    template&lt;typename _Clock, typename _Duration, typename _Predicate&gt;
      bool
      wait_until(unique_lock&lt;mutex&gt;&amp; __lock,
		 const chrono::time_point&lt;_Clock, _Duration&gt;&amp; __atime,
		 _Predicate __p)
      {
	while (!__p())
	  if (wait_until(__lock, __atime) == cv_status::timeout)
	    return __p();
	return true;
      }

    template&lt;typename _Rep, typename _Period&gt;
      cv_status
      wait_for(unique_lock&lt;mutex&gt;&amp; __lock,
	       const chrono::duration&lt;_Rep, _Period&gt;&amp; __rtime)
      {
	using __dur = typename steady_clock::duration;
	return wait_until(__lock,
			  steady_clock::now() +
			  chrono::__detail::ceil&lt;__dur&gt;(__rtime));
      }

    template&lt;typename _Rep, typename _Period, typename _Predicate&gt;
      bool
      wait_for(unique_lock&lt;mutex&gt;&amp; __lock,
	       const chrono::duration&lt;_Rep, _Period&gt;&amp; __rtime,
	       _Predicate __p)
      {
	using __dur = typename steady_clock::duration;
	return wait_until(__lock,
			  steady_clock::now() +
			  chrono::__detail::ceil&lt;__dur&gt;(__rtime),
			  std::move(__p));
      }

    native_handle_type
    native_handle()
    { return _M_cond.native_handle(); }

  private:
#ifdef _GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT
    template&lt;typename _Dur&gt;
      cv_status
      __wait_until_impl(unique_lock&lt;mutex&gt;&amp; __lock,
			const chrono::time_point&lt;steady_clock, _Dur&gt;&amp; __atime)
      {
	auto __s = chrono::time_point_cast&lt;chrono::seconds&gt;(__atime);
	auto __ns = chrono::duration_cast&lt;chrono::nanoseconds&gt;(__atime - __s);

	__gthread_time_t __ts =
	  {
	    static_cast&lt;std::time_t&gt;(__s.time_since_epoch().count()),
	    static_cast&lt;long&gt;(__ns.count())
	  };

	_M_cond.wait_until(*__lock.mutex(), CLOCK_MONOTONIC, __ts);

	return (steady_clock::now() &lt; __atime
		? cv_status::no_timeout : cv_status::timeout);
      }
#endif

    template&lt;typename _Dur&gt;
      cv_status
      __wait_until_impl(unique_lock&lt;mutex&gt;&amp; __lock,
			const chrono::time_point&lt;system_clock, _Dur&gt;&amp; __atime)
      {
	auto __s = chrono::time_point_cast&lt;chrono::seconds&gt;(__atime);
	auto __ns = chrono::duration_cast&lt;chrono::nanoseconds&gt;(__atime - __s);

	__gthread_time_t __ts =
	  {
	    static_cast&lt;std::time_t&gt;(__s.time_since_epoch().count()),
	    static_cast&lt;long&gt;(__ns.count())
	  };

	_M_cond.wait_until(*__lock.mutex(), __ts);

	return (system_clock::now() &lt; __atime
		? cv_status::no_timeout : cv_status::timeout);
      }
  };

  void
  notify_all_at_thread_exit(condition_variable&amp;, unique_lock&lt;mutex&gt;);

  struct __at_thread_exit_elt
  {
    __at_thread_exit_elt* _M_next;
    void (*_M_cb)(void*);
  };

  inline namespace _V2 {

  /// condition_variable_any
  // Like above, but mutex is not required to have try_lock.
  class condition_variable_any
  {
#ifdef _GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT
    using __clock_t = chrono::steady_clock;
#else
    using __clock_t = chrono::system_clock;
#endif
    condition_variable			_M_cond;
    shared_ptr&lt;mutex&gt;			_M_mutex;

    // scoped unlock - unlocks in ctor, re-locks in dtor
    template&lt;typename _Lock&gt;
      struct _Unlock
      {
	explicit _Unlock(_Lock&amp; __lk) : _M_lock(__lk) { __lk.unlock(); }

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored &quot;-Wdeprecated-declarations&quot;
	~_Unlock() noexcept(false)
	{
	  if (uncaught_exception())
	    {
	      __try
	      { _M_lock.lock(); }
	      __catch(const __cxxabiv1::__forced_unwind&amp;)
	      { __throw_exception_again; }
	      __catch(...)
	      { }
	    }
	  else
	    _M_lock.lock();
	}
#pragma GCC diagnostic pop

	_Unlock(const _Unlock&amp;) = delete;
	_Unlock&amp; operator=(const _Unlock&amp;) = delete;

	_Lock&amp; _M_lock;
      };

  public:
    condition_variable_any() : _M_mutex(std::make_shared&lt;mutex&gt;()) { }
    ~condition_variable_any() = default;

    condition_variable_any(const condition_variable_any&amp;) = delete;
    condition_variable_any&amp; operator=(const condition_variable_any&amp;) = delete;

    void
    notify_one() noexcept
    {
      lock_guard&lt;mutex&gt; __lock(*_M_mutex);
      _M_cond.notify_one();
    }

    void
    notify_all() noexcept
    {
      lock_guard&lt;mutex&gt; __lock(*_M_mutex);
      _M_cond.notify_all();
    }

    template&lt;typename _Lock&gt;
      void
      wait(_Lock&amp; __lock)
      {
	shared_ptr&lt;mutex&gt; __mutex = _M_mutex;
	unique_lock&lt;mutex&gt; __my_lock(*__mutex);
	_Unlock&lt;_Lock&gt; __unlock(__lock);
	// *__mutex must be unlocked before re-locking __lock so move
	// ownership of *__mutex lock to an object with shorter lifetime.
	unique_lock&lt;mutex&gt; __my_lock2(std::move(__my_lock));
	_M_cond.wait(__my_lock2);
      }


    template&lt;typename _Lock, typename _Predicate&gt;
      void
      wait(_Lock&amp; __lock, _Predicate __p)
      {
	while (!__p())
	  wait(__lock);
      }

    template&lt;typename _Lock, typename _Clock, typename _Duration&gt;
      cv_status
      wait_until(_Lock&amp; __lock,
		 const chrono::time_point&lt;_Clock, _Duration&gt;&amp; __atime)
      {
	shared_ptr&lt;mutex&gt; __mutex = _M_mutex;
	unique_lock&lt;mutex&gt; __my_lock(*__mutex);
	_Unlock&lt;_Lock&gt; __unlock(__lock);
	// *__mutex must be unlocked before re-locking __lock so move
	// ownership of *__mutex lock to an object with shorter lifetime.
	unique_lock&lt;mutex&gt; __my_lock2(std::move(__my_lock));
	return _M_cond.wait_until(__my_lock2, __atime);
      }

    template&lt;typename _Lock, typename _Clock,
	     typename _Duration, typename _Predicate&gt;
      bool
      wait_until(_Lock&amp; __lock,
		 const chrono::time_point&lt;_Clock, _Duration&gt;&amp; __atime,
		 _Predicate __p)
      {
	while (!__p())
	  if (wait_until(__lock, __atime) == cv_status::timeout)
	    return __p();
	return true;
      }

    template&lt;typename _Lock, typename _Rep, typename _Period&gt;
      cv_status
      wait_for(_Lock&amp; __lock, const chrono::duration&lt;_Rep, _Period&gt;&amp; __rtime)
      { return wait_until(__lock, __clock_t::now() + __rtime); }

    template&lt;typename _Lock, typename _Rep,
	     typename _Period, typename _Predicate&gt;
      bool
      wait_for(_Lock&amp; __lock,
	       const chrono::duration&lt;_Rep, _Period&gt;&amp; __rtime, _Predicate __p)
      { return wait_until(__lock, __clock_t::now() + __rtime, std::move(__p)); }

#ifdef __cpp_lib_jthread
    template &lt;class _Lock, class _Predicate&gt;
    bool wait(_Lock&amp; __lock,
              stop_token __stoken,
              _Predicate __p)
    {
      if (__stoken.stop_requested())
        {
          return __p();
        }
 
      std::stop_callback __cb(__stoken, [this] { notify_all(); });
      shared_ptr&lt;mutex&gt; __mutex = _M_mutex;
      while (!__p())
        {
          unique_lock&lt;mutex&gt; __my_lock(*__mutex);
          if (__stoken.stop_requested())
            {
              return false;
            }
          // *__mutex must be unlocked before re-locking __lock so move
          // ownership of *__mutex lock to an object with shorter lifetime.
          _Unlock&lt;_Lock&gt; __unlock(__lock);
          unique_lock&lt;mutex&gt; __my_lock2(std::move(__my_lock));
          _M_cond.wait(__my_lock2);
        }
      return true;
    }

    template &lt;class _Lock, class _Clock, class _Duration, class _Predicate&gt;
    bool wait_until(_Lock&amp; __lock,
                    stop_token __stoken,
                    const chrono::time_point&lt;_Clock, _Duration&gt;&amp; __abs_time,
                    _Predicate __p)
    {
      if (__stoken.stop_requested())
        {
          return __p();
        }

      std::stop_callback __cb(__stoken, [this] { notify_all(); });
      shared_ptr&lt;mutex&gt; __mutex = _M_mutex;
      while (!__p())
        {
          bool __stop;
          {
            unique_lock&lt;mutex&gt; __my_lock(*__mutex);
            if (__stoken.stop_requested())
              {
                return false;
              }
            _Unlock&lt;_Lock&gt; __u(__lock);
            unique_lock&lt;mutex&gt; __my_lock2(std::move(__my_lock));
            const auto __status = _M_cond.wait_until(__my_lock2, __abs_time);
            __stop = (__status == std::cv_status::timeout) || __stoken.stop_requested();
          }
          if (__stop)
            {
              return __p();
            }
        }
      return true;
    }

    template &lt;class _Lock, class _Rep, class _Period, class _Predicate&gt;
    bool wait_for(_Lock&amp; __lock,
                  stop_token __stoken,
                  const chrono::duration&lt;_Rep, _Period&gt;&amp; __rel_time,
                  _Predicate __p)
    {
      auto __abst = std::chrono::steady_clock::now() + __rel_time;
      return wait_until(__lock,
                        std::move(__stoken),
                        __abst,
                        std::move(__p));
    }
#endif
  };

  } // end inline namespace

  /// @} group condition_variables
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif // _GLIBCXX_HAS_GTHREADS
#endif // C++11
#endif // _GLIBCXX_CONDITION_VARIABLE
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