usr/arc-buildroot-linux-uclibc/include/c++/6.2.1/mutex - toolchains/quantenna - Git at Google

 // <mutex> -*- C++ -*-

 // Copyright (C) 2003-2016 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
 // <http://www.gnu.org/licenses/>.

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

 #ifndef _GLIBCXX_MUTEX
 #define _GLIBCXX_MUTEX 1

 #pragma GCC system_header

 #if __cplusplus < 201103L
 # include <bits/c++0x_warning.h>
 #else

 #include <tuple>
 #include <chrono>
 #include <exception>
 #include <type_traits>
 #include <functional>
 #include <system_error>
 #include <bits/std_mutex.h>
 #if ! _GTHREAD_USE_MUTEX_TIMEDLOCK
 # include <condition_variable>
 # include <thread>
 #endif

 #ifdef _GLIBCXX_USE_C99_STDINT_TR1

 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION

   /**
    * @ingroup mutexes
    * @{
    */

 #ifdef _GLIBCXX_HAS_GTHREADS

   // Common base class for std::recursive_mutex and std::recursive_timed_mutex
   class __recursive_mutex_base
   {
   protected:
     typedef __gthread_recursive_mutex_t		__native_type;

     __recursive_mutex_base(const __recursive_mutex_base&) = delete;
     __recursive_mutex_base& operator=(const __recursive_mutex_base&) = delete;

 #ifdef __GTHREAD_RECURSIVE_MUTEX_INIT
     __native_type  _M_mutex = __GTHREAD_RECURSIVE_MUTEX_INIT;

     __recursive_mutex_base() = default;
 #else
     __native_type  _M_mutex;

     __recursive_mutex_base()
     {
       // XXX EAGAIN, ENOMEM, EPERM, EBUSY(may), EINVAL(may)
       __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION(&_M_mutex);
     }

     ~__recursive_mutex_base()
     { __gthread_recursive_mutex_destroy(&_M_mutex); }
 #endif
   };

   /// The standard recursive mutex type.
   class recursive_mutex : private __recursive_mutex_base
   {
   public:
     typedef __native_type* 			native_handle_type;

     recursive_mutex() = default;
     ~recursive_mutex() = default;

     recursive_mutex(const recursive_mutex&) = delete;
     recursive_mutex& operator=(const recursive_mutex&) = delete;

     void
     lock()
     {
       int __e = __gthread_recursive_mutex_lock(&_M_mutex);

       // EINVAL, EAGAIN, EBUSY, EINVAL, EDEADLK(may)
       if (__e)
 	__throw_system_error(__e);
     }

     bool
     try_lock() noexcept
     {
       // XXX EINVAL, EAGAIN, EBUSY
       return !__gthread_recursive_mutex_trylock(&_M_mutex);
     }

     void
     unlock()
     {
       // XXX EINVAL, EAGAIN, EBUSY
       __gthread_recursive_mutex_unlock(&_M_mutex);
     }

     native_handle_type
     native_handle()
     { return &_M_mutex; }
   };

 #if _GTHREAD_USE_MUTEX_TIMEDLOCK
   template<typename _Derived>
     class __timed_mutex_impl
     {
     protected:
       typedef chrono::high_resolution_clock 	__clock_t;

       template<typename _Rep, typename _Period>
 	bool
 	_M_try_lock_for(const chrono::duration<_Rep, _Period>& __rtime)
 	{
 	  using chrono::steady_clock;
 	  auto __rt = chrono::duration_cast<steady_clock::duration>(__rtime);
 	  if (ratio_greater<steady_clock::period, _Period>())
 	    ++__rt;
 	  return _M_try_lock_until(steady_clock::now() + __rt);
 	}

       template<typename _Duration>
 	bool
 	_M_try_lock_until(const chrono::time_point<__clock_t,
 						   _Duration>& __atime)
 	{
 	  auto __s = chrono::time_point_cast<chrono::seconds>(__atime);
 	  auto __ns = chrono::duration_cast<chrono::nanoseconds>(__atime - __s);

 	  __gthread_time_t __ts = {
 	    static_cast<std::time_t>(__s.time_since_epoch().count()),
 	    static_cast<long>(__ns.count())
 	  };

 	  return static_cast<_Derived*>(this)->_M_timedlock(__ts);
 	}

       template<typename _Clock, typename _Duration>
 	bool
 	_M_try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime)
 	{
 	  auto __rtime = __atime - _Clock::now();
 	  return _M_try_lock_until(__clock_t::now() + __rtime);
 	}
     };

   /// The standard timed mutex type.
   class timed_mutex
   : private __mutex_base, public __timed_mutex_impl<timed_mutex>
   {
   public:
     typedef __native_type* 		  	native_handle_type;

     timed_mutex() = default;
     ~timed_mutex() = default;

     timed_mutex(const timed_mutex&) = delete;
     timed_mutex& operator=(const timed_mutex&) = delete;

     void
     lock()
     {
       int __e = __gthread_mutex_lock(&_M_mutex);

       // EINVAL, EAGAIN, EBUSY, EINVAL, EDEADLK(may)
       if (__e)
 	__throw_system_error(__e);
     }

     bool
     try_lock() noexcept
     {
       // XXX EINVAL, EAGAIN, EBUSY
       return !__gthread_mutex_trylock(&_M_mutex);
     }

     template <class _Rep, class _Period>
       bool
       try_lock_for(const chrono::duration<_Rep, _Period>& __rtime)
       { return _M_try_lock_for(__rtime); }

     template <class _Clock, class _Duration>
       bool
       try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime)
       { return _M_try_lock_until(__atime); }

     void
     unlock()
     {
       // XXX EINVAL, EAGAIN, EBUSY
       __gthread_mutex_unlock(&_M_mutex);
     }

     native_handle_type
     native_handle()
     { return &_M_mutex; }

     private:
       friend class __timed_mutex_impl<timed_mutex>;

       bool
       _M_timedlock(const __gthread_time_t& __ts)
       { return !__gthread_mutex_timedlock(&_M_mutex, &__ts); }
   };

   /// recursive_timed_mutex
   class recursive_timed_mutex
   : private __recursive_mutex_base,
     public __timed_mutex_impl<recursive_timed_mutex>
   {
   public:
     typedef __native_type* 			native_handle_type;

     recursive_timed_mutex() = default;
     ~recursive_timed_mutex() = default;

     recursive_timed_mutex(const recursive_timed_mutex&) = delete;
     recursive_timed_mutex& operator=(const recursive_timed_mutex&) = delete;

     void
     lock()
     {
       int __e = __gthread_recursive_mutex_lock(&_M_mutex);

       // EINVAL, EAGAIN, EBUSY, EINVAL, EDEADLK(may)
       if (__e)
 	__throw_system_error(__e);
     }

     bool
     try_lock() noexcept
     {
       // XXX EINVAL, EAGAIN, EBUSY
       return !__gthread_recursive_mutex_trylock(&_M_mutex);
     }

     template <class _Rep, class _Period>
       bool
       try_lock_for(const chrono::duration<_Rep, _Period>& __rtime)
       { return _M_try_lock_for(__rtime); }

     template <class _Clock, class _Duration>
       bool
       try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime)
       { return _M_try_lock_until(__atime); }

     void
     unlock()
     {
       // XXX EINVAL, EAGAIN, EBUSY
       __gthread_recursive_mutex_unlock(&_M_mutex);
     }

     native_handle_type
     native_handle()
     { return &_M_mutex; }

     private:
       friend class __timed_mutex_impl<recursive_timed_mutex>;

       bool
       _M_timedlock(const __gthread_time_t& __ts)
       { return !__gthread_recursive_mutex_timedlock(&_M_mutex, &__ts); }
   };

 #else // !_GTHREAD_USE_MUTEX_TIMEDLOCK

   /// timed_mutex
   class timed_mutex
   {
     mutex		_M_mut;
     condition_variable	_M_cv;
     bool		_M_locked = false;

   public:

     timed_mutex() = default;
     ~timed_mutex() { __glibcxx_assert( !_M_locked ); }

     timed_mutex(const timed_mutex&) = delete;
     timed_mutex& operator=(const timed_mutex&) = delete;

     void
     lock()
     {
       unique_lock<mutex> __lk(_M_mut);
       _M_cv.wait(__lk, [&]{ return !_M_locked; });
       _M_locked = true;
     }

     bool
     try_lock()
     {
       lock_guard<mutex> __lk(_M_mut);
       if (_M_locked)
 	return false;
       _M_locked = true;
       return true;
     }

     template<typename _Rep, typename _Period>
       bool
       try_lock_for(const chrono::duration<_Rep, _Period>& __rtime)
       {
 	unique_lock<mutex> __lk(_M_mut);
 	if (!_M_cv.wait_for(__lk, __rtime, [&]{ return !_M_locked; }))
 	  return false;
 	_M_locked = true;
 	return true;
       }

     template<typename _Clock, typename _Duration>
       bool
       try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime)
       {
 	unique_lock<mutex> __lk(_M_mut);
 	if (!_M_cv.wait_until(__lk, __atime, [&]{ return !_M_locked; }))
 	  return false;
 	_M_locked = true;
 	return true;
       }

     void
     unlock()
     {
       lock_guard<mutex> __lk(_M_mut);
       __glibcxx_assert( _M_locked );
       _M_locked = false;
       _M_cv.notify_one();
     }
   };

   /// recursive_timed_mutex
   class recursive_timed_mutex
   {
     mutex		_M_mut;
     condition_variable	_M_cv;
     thread::id		_M_owner;
     unsigned		_M_count = 0;

     // Predicate type that tests whether the current thread can lock a mutex.
     struct _Can_lock
     {
       // Returns true if the mutex is unlocked or is locked by _M_caller.
       bool
       operator()() const noexcept
       { return _M_mx->_M_count == 0 || _M_mx->_M_owner == _M_caller; }

       const recursive_timed_mutex* _M_mx;
       thread::id _M_caller;
     };

   public:

     recursive_timed_mutex() = default;
     ~recursive_timed_mutex() { __glibcxx_assert( _M_count == 0 ); }

     recursive_timed_mutex(const recursive_timed_mutex&) = delete;
     recursive_timed_mutex& operator=(const recursive_timed_mutex&) = delete;

     void
     lock()
     {
       auto __id = this_thread::get_id();
       _Can_lock __can_lock{this, __id};
       unique_lock<mutex> __lk(_M_mut);
       _M_cv.wait(__lk, __can_lock);
       if (_M_count == -1u)
 	__throw_system_error(EAGAIN); // [thread.timedmutex.recursive]/3
       _M_owner = __id;
       ++_M_count;
     }

     bool
     try_lock()
     {
       auto __id = this_thread::get_id();
       _Can_lock __can_lock{this, __id};
       lock_guard<mutex> __lk(_M_mut);
       if (!__can_lock())
 	return false;
       if (_M_count == -1u)
 	return false;
       _M_owner = __id;
       ++_M_count;
       return true;
     }

     template<typename _Rep, typename _Period>
       bool
       try_lock_for(const chrono::duration<_Rep, _Period>& __rtime)
       {
 	auto __id = this_thread::get_id();
 	_Can_lock __can_lock{this, __id};
 	unique_lock<mutex> __lk(_M_mut);
 	if (!_M_cv.wait_for(__lk, __rtime, __can_lock))
 	  return false;
 	if (_M_count == -1u)
 	  return false;
 	_M_owner = __id;
 	++_M_count;
 	return true;
       }

     template<typename _Clock, typename _Duration>
       bool
       try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime)
       {
 	auto __id = this_thread::get_id();
 	_Can_lock __can_lock{this, __id};
 	unique_lock<mutex> __lk(_M_mut);
 	if (!_M_cv.wait_until(__lk, __atime, __can_lock))
 	  return false;
 	if (_M_count == -1u)
 	  return false;
 	_M_owner = __id;
 	++_M_count;
 	return true;
       }

     void
     unlock()
     {
       lock_guard<mutex> __lk(_M_mut);
       __glibcxx_assert( _M_owner == this_thread::get_id() );
       __glibcxx_assert( _M_count > 0 );
       if (--_M_count == 0)
 	{
 	  _M_owner = {};
 	  _M_cv.notify_one();
 	}
     }
   };

 #endif
 #endif // _GLIBCXX_HAS_GTHREADS

   template<typename _Lock>
     inline unique_lock<_Lock>
     __try_to_lock(_Lock& __l)
     { return unique_lock<_Lock>{__l, try_to_lock}; }

   template<int _Idx, bool _Continue = true>
     struct __try_lock_impl
     {
       template<typename... _Lock>
 	static void
 	__do_try_lock(tuple<_Lock&...>& __locks, int& __idx)
 	{
           __idx = _Idx;
           auto __lock = std::__try_to_lock(std::get<_Idx>(__locks));
           if (__lock.owns_lock())
             {
 	      constexpr bool __cont = _Idx + 2 < sizeof...(_Lock);
 	      using __try_locker = __try_lock_impl<_Idx + 1, __cont>;
 	      __try_locker::__do_try_lock(__locks, __idx);
               if (__idx == -1)
                 __lock.release();
             }
 	}
     };

   template<int _Idx>
     struct __try_lock_impl<_Idx, false>
     {
       template<typename... _Lock>
 	static void
 	__do_try_lock(tuple<_Lock&...>& __locks, int& __idx)
 	{
           __idx = _Idx;
           auto __lock = std::__try_to_lock(std::get<_Idx>(__locks));
           if (__lock.owns_lock())
             {
               __idx = -1;
               __lock.release();
             }
 	}
     };

   /** @brief Generic try_lock.
    *  @param __l1 Meets Mutex requirements (try_lock() may throw).
    *  @param __l2 Meets Mutex requirements (try_lock() may throw).
    *  @param __l3 Meets Mutex requirements (try_lock() may throw).
    *  @return Returns -1 if all try_lock() calls return true. Otherwise returns
    *          a 0-based index corresponding to the argument that returned false.
    *  @post Either all arguments are locked, or none will be.
    *
    *  Sequentially calls try_lock() on each argument.
    */
   template<typename _Lock1, typename _Lock2, typename... _Lock3>
     int
     try_lock(_Lock1& __l1, _Lock2& __l2, _Lock3&... __l3)
     {
       int __idx;
       auto __locks = std::tie(__l1, __l2, __l3...);
       __try_lock_impl<0>::__do_try_lock(__locks, __idx);
       return __idx;
     }

   /** @brief Generic lock.
    *  @param __l1 Meets Mutex requirements (try_lock() may throw).
    *  @param __l2 Meets Mutex requirements (try_lock() may throw).
    *  @param __l3 Meets Mutex requirements (try_lock() may throw).
    *  @throw An exception thrown by an argument's lock() or try_lock() member.
    *  @post All arguments are locked.
    *
    *  All arguments are locked via a sequence of calls to lock(), try_lock()
    *  and unlock().  If the call exits via an exception any locks that were
    *  obtained will be released.
    */
   template<typename _L1, typename _L2, typename... _L3>
     void
     lock(_L1& __l1, _L2& __l2, _L3&... __l3)
     {
       while (true)
         {
           using __try_locker = __try_lock_impl<0, sizeof...(_L3) != 0>;
           unique_lock<_L1> __first(__l1);
           int __idx;
           auto __locks = std::tie(__l2, __l3...);
           __try_locker::__do_try_lock(__locks, __idx);
           if (__idx == -1)
             {
               __first.release();
               return;
             }
         }
     }

 #ifdef _GLIBCXX_HAS_GTHREADS
   /// once_flag
   struct once_flag
   {
   private:
     typedef __gthread_once_t __native_type;
     __native_type  _M_once = __GTHREAD_ONCE_INIT;

   public:
     /// Constructor
     constexpr once_flag() noexcept = default;

     /// Deleted copy constructor
     once_flag(const once_flag&) = delete;
     /// Deleted assignment operator
     once_flag& operator=(const once_flag&) = delete;

     template<typename _Callable, typename... _Args>
       friend void
       call_once(once_flag& __once, _Callable&& __f, _Args&&... __args);
   };

 #ifdef _GLIBCXX_HAVE_TLS
   extern __thread void* __once_callable;
   extern __thread void (*__once_call)();

   template<typename _Callable>
     inline void
     __once_call_impl()
     {
       (*(_Callable*)__once_callable)();
     }
 #else
   extern function<void()> __once_functor;

   extern void
   __set_once_functor_lock_ptr(unique_lock<mutex>*);

   extern mutex&
   __get_once_mutex();
 #endif

   extern "C" void __once_proxy(void);

   /// call_once
   template<typename _Callable, typename... _Args>
     void
     call_once(once_flag& __once, _Callable&& __f, _Args&&... __args)
     {
 #ifdef _GLIBCXX_HAVE_TLS
       auto __bound_functor = std::__bind_simple(std::forward<_Callable>(__f),
           std::forward<_Args>(__args)...);
       __once_callable = std::__addressof(__bound_functor);
       __once_call = &__once_call_impl<decltype(__bound_functor)>;
 #else
       unique_lock<mutex> __functor_lock(__get_once_mutex());
       auto __callable = std::__bind_simple(std::forward<_Callable>(__f),
           std::forward<_Args>(__args)...);
       __once_functor = [&]() { __callable(); };
       __set_once_functor_lock_ptr(&__functor_lock);
 #endif

       int __e = __gthread_once(&__once._M_once, &__once_proxy);

 #ifndef _GLIBCXX_HAVE_TLS
       if (__functor_lock)
         __set_once_functor_lock_ptr(0);
 #endif

       if (__e)
 	__throw_system_error(__e);
     }
 #endif // _GLIBCXX_HAS_GTHREADS

   // @} group mutexes
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace
 #endif // _GLIBCXX_USE_C99_STDINT_TR1

 #endif // C++11

 #endif // _GLIBCXX_MUTEX
	// <mutex> -- C++ --

	// Copyright (C) 2003-2016 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
	// <http://www.gnu.org/licenses/>.

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

	#ifndef _GLIBCXX_MUTEX
	#define _GLIBCXX_MUTEX 1

	#pragma GCC system_header

	#if __cplusplus < 201103L
	# include <bits/c++0x_warning.h>
	#else

	#include <tuple>
	#include <chrono>
	#include <exception>
	#include <type_traits>
	#include <functional>
	#include <system_error>
	#include <bits/std_mutex.h>
	#if ! _GTHREAD_USE_MUTEX_TIMEDLOCK
	# include <condition_variable>
	# include <thread>
	#endif

	#ifdef _GLIBCXX_USE_C99_STDINT_TR1

	namespace std _GLIBCXX_VISIBILITY(default)
	{
	_GLIBCXX_BEGIN_NAMESPACE_VERSION

	/**
	* @ingroup mutexes
	* @{
	*/

	#ifdef _GLIBCXX_HAS_GTHREADS

	// Common base class for std::recursive_mutex and std::recursive_timed_mutex
	class __recursive_mutex_base
	{
	protected:
	typedef __gthread_recursive_mutex_t __native_type;

	__recursive_mutex_base(const __recursive_mutex_base&) = delete;
	__recursive_mutex_base& operator=(const __recursive_mutex_base&) = delete;

	#ifdef __GTHREAD_RECURSIVE_MUTEX_INIT
	__native_type _M_mutex = __GTHREAD_RECURSIVE_MUTEX_INIT;

	__recursive_mutex_base() = default;
	#else
	__native_type _M_mutex;

	__recursive_mutex_base()
	{
	// XXX EAGAIN, ENOMEM, EPERM, EBUSY(may), EINVAL(may)
	__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION(&_M_mutex);
	}

	~__recursive_mutex_base()
	{ __gthread_recursive_mutex_destroy(&_M_mutex); }
	#endif
	};

	/// The standard recursive mutex type.
	class recursive_mutex : private __recursive_mutex_base
	{
	public:
	typedef __native_type* native_handle_type;

	recursive_mutex() = default;
	~recursive_mutex() = default;

	recursive_mutex(const recursive_mutex&) = delete;
	recursive_mutex& operator=(const recursive_mutex&) = delete;

	void
	lock()
	{
	int __e = __gthread_recursive_mutex_lock(&_M_mutex);

	// EINVAL, EAGAIN, EBUSY, EINVAL, EDEADLK(may)
	if (__e)
	__throw_system_error(__e);
	}

	bool
	try_lock() noexcept
	{
	// XXX EINVAL, EAGAIN, EBUSY
	return !__gthread_recursive_mutex_trylock(&_M_mutex);
	}

	void
	unlock()
	{
	// XXX EINVAL, EAGAIN, EBUSY
	__gthread_recursive_mutex_unlock(&_M_mutex);
	}

	native_handle_type
	native_handle()
	{ return &_M_mutex; }
	};

	#if _GTHREAD_USE_MUTEX_TIMEDLOCK
	template<typename _Derived>
	class __timed_mutex_impl
	{
	protected:
	typedef chrono::high_resolution_clock __clock_t;

	template<typename _Rep, typename _Period>
	bool
	_M_try_lock_for(const chrono::duration<_Rep, _Period>& __rtime)
	{
	using chrono::steady_clock;
	auto __rt = chrono::duration_cast<steady_clock::duration>(__rtime);
	if (ratio_greater<steady_clock::period, _Period>())
	++__rt;
	return _M_try_lock_until(steady_clock::now() + __rt);
	}

	template<typename _Duration>
	bool
	_M_try_lock_until(const chrono::time_point<__clock_t,
	_Duration>& __atime)
	{
	auto __s = chrono::time_point_cast<chrono::seconds>(__atime);
	auto __ns = chrono::duration_cast<chrono::nanoseconds>(__atime - __s);

	__gthread_time_t __ts = {
	static_cast<std::time_t>(__s.time_since_epoch().count()),
	static_cast<long>(__ns.count())
	};

	return static_cast<_Derived*>(this)->_M_timedlock(__ts);
	}

	template<typename _Clock, typename _Duration>
	bool
	_M_try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime)
	{
	auto __rtime = __atime - _Clock::now();
	return _M_try_lock_until(__clock_t::now() + __rtime);
	}
	};

	/// The standard timed mutex type.
	class timed_mutex
	: private __mutex_base, public __timed_mutex_impl<timed_mutex>
	{
	public:
	typedef __native_type* native_handle_type;

	timed_mutex() = default;
	~timed_mutex() = default;

	timed_mutex(const timed_mutex&) = delete;
	timed_mutex& operator=(const timed_mutex&) = delete;

	void
	lock()
	{
	int __e = __gthread_mutex_lock(&_M_mutex);

	// EINVAL, EAGAIN, EBUSY, EINVAL, EDEADLK(may)
	if (__e)
	__throw_system_error(__e);
	}

	bool
	try_lock() noexcept
	{
	// XXX EINVAL, EAGAIN, EBUSY
	return !__gthread_mutex_trylock(&_M_mutex);
	}

	template <class _Rep, class _Period>
	bool
	try_lock_for(const chrono::duration<_Rep, _Period>& __rtime)
	{ return _M_try_lock_for(__rtime); }

	template <class _Clock, class _Duration>
	bool
	try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime)
	{ return _M_try_lock_until(__atime); }

	void
	unlock()
	{
	// XXX EINVAL, EAGAIN, EBUSY
	__gthread_mutex_unlock(&_M_mutex);
	}

	native_handle_type
	native_handle()
	{ return &_M_mutex; }

	private:
	friend class __timed_mutex_impl<timed_mutex>;

	bool
	_M_timedlock(const __gthread_time_t& __ts)
	{ return !__gthread_mutex_timedlock(&_M_mutex, &__ts); }
	};

	/// recursive_timed_mutex
	class recursive_timed_mutex
	: private __recursive_mutex_base,
	public __timed_mutex_impl<recursive_timed_mutex>
	{
	public:
	typedef __native_type* native_handle_type;

	recursive_timed_mutex() = default;
	~recursive_timed_mutex() = default;

	recursive_timed_mutex(const recursive_timed_mutex&) = delete;
	recursive_timed_mutex& operator=(const recursive_timed_mutex&) = delete;

	void
	lock()
	{
	int __e = __gthread_recursive_mutex_lock(&_M_mutex);

	// EINVAL, EAGAIN, EBUSY, EINVAL, EDEADLK(may)
	if (__e)
	__throw_system_error(__e);
	}

	bool
	try_lock() noexcept
	{
	// XXX EINVAL, EAGAIN, EBUSY
	return !__gthread_recursive_mutex_trylock(&_M_mutex);
	}

	template <class _Rep, class _Period>
	bool
	try_lock_for(const chrono::duration<_Rep, _Period>& __rtime)
	{ return _M_try_lock_for(__rtime); }

	template <class _Clock, class _Duration>
	bool
	try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime)
	{ return _M_try_lock_until(__atime); }

	void
	unlock()
	{
	// XXX EINVAL, EAGAIN, EBUSY
	__gthread_recursive_mutex_unlock(&_M_mutex);
	}

	native_handle_type
	native_handle()
	{ return &_M_mutex; }

	private:
	friend class __timed_mutex_impl<recursive_timed_mutex>;

	bool
	_M_timedlock(const __gthread_time_t& __ts)
	{ return !__gthread_recursive_mutex_timedlock(&_M_mutex, &__ts); }
	};

	#else // !_GTHREAD_USE_MUTEX_TIMEDLOCK

	/// timed_mutex
	class timed_mutex
	{
	mutex _M_mut;
	condition_variable _M_cv;
	bool _M_locked = false;

	public:

	timed_mutex() = default;
	~timed_mutex() { __glibcxx_assert( !_M_locked ); }

	timed_mutex(const timed_mutex&) = delete;
	timed_mutex& operator=(const timed_mutex&) = delete;

	void
	lock()
	{
	unique_lock<mutex> __lk(_M_mut);
	_M_cv.wait(__lk, [&]{ return !_M_locked; });
	_M_locked = true;
	}

	bool
	try_lock()
	{
	lock_guard<mutex> __lk(_M_mut);
	if (_M_locked)
	return false;
	_M_locked = true;
	return true;
	}

	template<typename _Rep, typename _Period>
	bool
	try_lock_for(const chrono::duration<_Rep, _Period>& __rtime)
	{
	unique_lock<mutex> __lk(_M_mut);
	if (!_M_cv.wait_for(__lk, __rtime, [&]{ return !_M_locked; }))
	return false;
	_M_locked = true;
	return true;
	}

	template<typename _Clock, typename _Duration>
	bool
	try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime)
	{
	unique_lock<mutex> __lk(_M_mut);
	if (!_M_cv.wait_until(__lk, __atime, [&]{ return !_M_locked; }))
	return false;
	_M_locked = true;
	return true;
	}

	void
	unlock()
	{
	lock_guard<mutex> __lk(_M_mut);
	__glibcxx_assert( _M_locked );
	_M_locked = false;
	_M_cv.notify_one();
	}
	};

	/// recursive_timed_mutex
	class recursive_timed_mutex
	{
	mutex _M_mut;
	condition_variable _M_cv;
	thread::id _M_owner;
	unsigned _M_count = 0;

	// Predicate type that tests whether the current thread can lock a mutex.
	struct _Can_lock
	{
	// Returns true if the mutex is unlocked or is locked by _M_caller.
	bool
	operator()() const noexcept
	{ return _M_mx->_M_count == 0 \|\| _M_mx->_M_owner == _M_caller; }

	const recursive_timed_mutex* _M_mx;
	thread::id _M_caller;
	};

	public:

	recursive_timed_mutex() = default;
	~recursive_timed_mutex() { __glibcxx_assert( _M_count == 0 ); }

	recursive_timed_mutex(const recursive_timed_mutex&) = delete;
	recursive_timed_mutex& operator=(const recursive_timed_mutex&) = delete;

	void
	lock()
	{
	auto __id = this_thread::get_id();
	_Can_lock __can_lock{this, __id};
	unique_lock<mutex> __lk(_M_mut);
	_M_cv.wait(__lk, __can_lock);
	if (_M_count == -1u)
	__throw_system_error(EAGAIN); // [thread.timedmutex.recursive]/3
	_M_owner = __id;
	++_M_count;
	}

	bool
	try_lock()
	{
	auto __id = this_thread::get_id();
	_Can_lock __can_lock{this, __id};
	lock_guard<mutex> __lk(_M_mut);
	if (!__can_lock())
	return false;
	if (_M_count == -1u)
	return false;
	_M_owner = __id;
	++_M_count;
	return true;
	}

	template<typename _Rep, typename _Period>
	bool
	try_lock_for(const chrono::duration<_Rep, _Period>& __rtime)
	{
	auto __id = this_thread::get_id();
	_Can_lock __can_lock{this, __id};
	unique_lock<mutex> __lk(_M_mut);
	if (!_M_cv.wait_for(__lk, __rtime, __can_lock))
	return false;
	if (_M_count == -1u)
	return false;
	_M_owner = __id;
	++_M_count;
	return true;
	}

	template<typename _Clock, typename _Duration>
	bool
	try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime)
	{
	auto __id = this_thread::get_id();
	_Can_lock __can_lock{this, __id};
	unique_lock<mutex> __lk(_M_mut);
	if (!_M_cv.wait_until(__lk, __atime, __can_lock))
	return false;
	if (_M_count == -1u)
	return false;
	_M_owner = __id;
	++_M_count;
	return true;
	}

	void
	unlock()
	{
	lock_guard<mutex> __lk(_M_mut);
	__glibcxx_assert( _M_owner == this_thread::get_id() );
	__glibcxx_assert( _M_count > 0 );
	if (--_M_count == 0)
	{
	_M_owner = {};
	_M_cv.notify_one();
	}
	}
	};

	#endif
	#endif // _GLIBCXX_HAS_GTHREADS

	template<typename _Lock>
	inline unique_lock<_Lock>
	__try_to_lock(_Lock& __l)
	{ return unique_lock<_Lock>{__l, try_to_lock}; }

	template<int _Idx, bool _Continue = true>
	struct __try_lock_impl
	{
	template<typename... _Lock>
	static void
	__do_try_lock(tuple<_Lock&...>& __locks, int& __idx)
	{
	__idx = _Idx;
	auto __lock = std::__try_to_lock(std::get<_Idx>(__locks));
	if (__lock.owns_lock())
	{
	constexpr bool __cont = _Idx + 2 < sizeof...(_Lock);
	using __try_locker = __try_lock_impl<_Idx + 1, __cont>;
	__try_locker::__do_try_lock(__locks, __idx);
	if (__idx == -1)
	__lock.release();
	}
	}
	};

	template<int _Idx>
	struct __try_lock_impl<_Idx, false>
	{
	template<typename... _Lock>
	static void
	__do_try_lock(tuple<_Lock&...>& __locks, int& __idx)
	{
	__idx = _Idx;
	auto __lock = std::__try_to_lock(std::get<_Idx>(__locks));
	if (__lock.owns_lock())
	{
	__idx = -1;
	__lock.release();
	}
	}
	};

	/** @brief Generic try_lock.
	* @param __l1 Meets Mutex requirements (try_lock() may throw).
	* @param __l2 Meets Mutex requirements (try_lock() may throw).
	* @param __l3 Meets Mutex requirements (try_lock() may throw).
	* @return Returns -1 if all try_lock() calls return true. Otherwise returns
	* a 0-based index corresponding to the argument that returned false.
	* @post Either all arguments are locked, or none will be.
	*
	* Sequentially calls try_lock() on each argument.
	*/
	template<typename _Lock1, typename _Lock2, typename... _Lock3>
	int
	try_lock(_Lock1& __l1, _Lock2& __l2, _Lock3&... __l3)
	{
	int __idx;
	auto __locks = std::tie(__l1, __l2, __l3...);
	__try_lock_impl<0>::__do_try_lock(__locks, __idx);
	return __idx;
	}

	/** @brief Generic lock.
	* @param __l1 Meets Mutex requirements (try_lock() may throw).
	* @param __l2 Meets Mutex requirements (try_lock() may throw).
	* @param __l3 Meets Mutex requirements (try_lock() may throw).
	* @throw An exception thrown by an argument's lock() or try_lock() member.
	* @post All arguments are locked.
	*
	* All arguments are locked via a sequence of calls to lock(), try_lock()
	* and unlock(). If the call exits via an exception any locks that were
	* obtained will be released.
	*/
	template<typename _L1, typename _L2, typename... _L3>
	void
	lock(_L1& __l1, _L2& __l2, _L3&... __l3)
	{
	while (true)
	{
	using __try_locker = __try_lock_impl<0, sizeof...(_L3) != 0>;
	unique_lock<_L1> __first(__l1);
	int __idx;
	auto __locks = std::tie(__l2, __l3...);
	__try_locker::__do_try_lock(__locks, __idx);
	if (__idx == -1)
	{
	__first.release();
	return;
	}
	}
	}

	#ifdef _GLIBCXX_HAS_GTHREADS
	/// once_flag
	struct once_flag
	{
	private:
	typedef __gthread_once_t __native_type;
	__native_type _M_once = __GTHREAD_ONCE_INIT;

	public:
	/// Constructor
	constexpr once_flag() noexcept = default;

	/// Deleted copy constructor
	once_flag(const once_flag&) = delete;
	/// Deleted assignment operator
	once_flag& operator=(const once_flag&) = delete;

	template<typename _Callable, typename... _Args>
	friend void
	call_once(once_flag& __once, _Callable&& __f, _Args&&... __args);
	};

	#ifdef _GLIBCXX_HAVE_TLS
	extern __thread void* __once_callable;
	extern __thread void (*__once_call)();

	template<typename _Callable>
	inline void
	__once_call_impl()
	{
	((_Callable)__once_callable)();
	}
	#else
	extern function<void()> __once_functor;

	extern void
	__set_once_functor_lock_ptr(unique_lock<mutex>*);

	extern mutex&
	__get_once_mutex();
	#endif

	extern "C" void __once_proxy(void);

	/// call_once
	template<typename _Callable, typename... _Args>
	void
	call_once(once_flag& __once, _Callable&& __f, _Args&&... __args)
	{
	#ifdef _GLIBCXX_HAVE_TLS
	auto __bound_functor = std::__bind_simple(std::forward<_Callable>(__f),
	std::forward<_Args>(__args)...);
	__once_callable = std::__addressof(__bound_functor);
	__once_call = &__once_call_impl<decltype(__bound_functor)>;
	#else
	unique_lock<mutex> __functor_lock(__get_once_mutex());
	auto __callable = std::__bind_simple(std::forward<_Callable>(__f),
	std::forward<_Args>(__args)...);
	__once_functor = [&]() { __callable(); };
	__set_once_functor_lock_ptr(&__functor_lock);
	#endif

	int __e = __gthread_once(&__once._M_once, &__once_proxy);

	#ifndef _GLIBCXX_HAVE_TLS
	if (__functor_lock)
	__set_once_functor_lock_ptr(0);
	#endif

	if (__e)
	__throw_system_error(__e);
	}
	#endif // _GLIBCXX_HAS_GTHREADS

	// @} group mutexes
	_GLIBCXX_END_NAMESPACE_VERSION
	} // namespace
	#endif // _GLIBCXX_USE_C99_STDINT_TR1

	#endif // C++11

	#endif // _GLIBCXX_MUTEX