#$@%#$%!

Ngiler SH3LL 360
: / proc / thread-self / root / usr / include / c++ / 8 /

Information Server
MySQL : OFF Perl : OFF CURL : ON WGET : OFF PKEXEC : OFF

Directive	Local Value
IP Address	162.0.209.101
System	Linux premium169.web-hosting.com 4.18.0-553.50.1.lve.el8.x86_64 #1 SMP Thu Apr 17 19:10:24 UTC 2025 x86_64
User	luxeelil
PHP Version	8.0.30
Software	LiteSpeed
Doc root	Writable

Edit File : mutex \| Size : 17.80 KB
// <mutex> -- C++ -- // Copyright (C) 2003-2018 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 <system_error> #include <bits/std_mutex.h> #if ! _GTHREAD_USE_MUTEX_TIMEDLOCK # include <condition_variable> # include <thread> #endif #ifndef _GLIBCXX_HAVE_TLS # include <bits/std_function.h> #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() noexcept { 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() noexcept { 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() noexcept { 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 Lockable requirements (try_lock() may throw). * @param __l2 Meets Lockable requirements (try_lock() may throw). * @param __l3 Meets Lockable 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 Lockable requirements (try_lock() may throw). * @param __l2 Meets Lockable requirements (try_lock() may throw). * @param __l3 Meets Lockable 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; } } } #if __cplusplus >= 201703L #define __cpp_lib_scoped_lock 201703 /* @brief A scoped lock type for multiple lockable objects. * * A scoped_lock controls mutex ownership within a scope, releasing * ownership in the destructor. / template<typename... _MutexTypes> class scoped_lock { public: explicit scoped_lock(_MutexTypes&... __m) : _M_devices(std::tie(__m...)) { std::lock(__m...); } explicit scoped_lock(adopt_lock_t, _MutexTypes&... __m) noexcept : _M_devices(std::tie(__m...)) { } // calling thread owns mutex ~scoped_lock() { std::apply([](_MutexTypes&... __m) { char __i[] __attribute__((__unused__)) = { (__m.unlock(), 0)... }; }, _M_devices); } scoped_lock(const scoped_lock&) = delete; scoped_lock& operator=(const scoped_lock&) = delete; private: tuple<_MutexTypes&...> _M_devices; }; template<> class scoped_lock<> { public: explicit scoped_lock() = default; explicit scoped_lock(adopt_lock_t) noexcept { } ~scoped_lock() = default; scoped_lock(const scoped_lock&) = delete; scoped_lock& operator=(const scoped_lock&) = delete; }; template<typename _Mutex> class scoped_lock<_Mutex> { public: using mutex_type = _Mutex; explicit scoped_lock(mutex_type& __m) : _M_device(__m) { _M_device.lock(); } explicit scoped_lock(adopt_lock_t, mutex_type& __m) noexcept : _M_device(__m) { } // calling thread owns mutex ~scoped_lock() { _M_device.unlock(); } scoped_lock(const scoped_lock&) = delete; scoped_lock& operator=(const scoped_lock&) = delete; private: mutex_type& _M_device; }; #endif // C++17 #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)(); #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) { // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2442. call_once() shouldn't DECAY_COPY() auto __callable = [&] { std::__invoke(std::forward<_Callable>(__f), std::forward<_Args>(__args)...); }; #ifdef _GLIBCXX_HAVE_TLS __once_callable = std::__addressof(__callable); // NOLINT: PR 82481 __once_call = []{ ((decltype(__callable))__once_callable)(); }; #else unique_lock<mutex> __functor_lock(__get_once_mutex()); __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 Back

Edit File : mutex | Size : 17.80 KB

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

// Copyright (C) 2003-2018 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 <system_error>
#include <bits/std_mutex.h>
#if ! _GTHREAD_USE_MUTEX_TIMEDLOCK
# include <condition_variable>
# include <thread>
#endif
#ifndef _GLIBCXX_HAVE_TLS
# include <bits/std_function.h>
#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() noexcept
    { 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() noexcept
    { 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() noexcept
    { 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 Lockable requirements (try_lock() may throw).
   *  @param __l2 Meets Lockable requirements (try_lock() may throw).
   *  @param __l3 Meets Lockable 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 Lockable requirements (try_lock() may throw).
   *  @param __l2 Meets Lockable requirements (try_lock() may throw).
   *  @param __l3 Meets Lockable 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;
            }
        }
    }

#if __cplusplus >= 201703L
#define __cpp_lib_scoped_lock 201703
  /** @brief A scoped lock type for multiple lockable objects.
   *
   * A scoped_lock controls mutex ownership within a scope, releasing
   * ownership in the destructor.
   */
  template<typename... _MutexTypes>
    class scoped_lock
    {
    public:
      explicit scoped_lock(_MutexTypes&... __m) : _M_devices(std::tie(__m...))
      { std::lock(__m...); }

explicit scoped_lock(adopt_lock_t, _MutexTypes&... __m) noexcept
      : _M_devices(std::tie(__m...))
      { } // calling thread owns mutex

~scoped_lock()
      {
	std::apply([](_MutexTypes&... __m) {
	  char __i[] __attribute__((__unused__)) = { (__m.unlock(), 0)... };
	}, _M_devices);
      }

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

private:
      tuple<_MutexTypes&...> _M_devices;
    };

template<>
    class scoped_lock<>
    {
    public:
      explicit scoped_lock() = default;
      explicit scoped_lock(adopt_lock_t) noexcept { }
      ~scoped_lock() = default;

scoped_lock(const scoped_lock&) = delete;
      scoped_lock& operator=(const scoped_lock&) = delete;
    };

template<typename _Mutex>
    class scoped_lock<_Mutex>
    {
    public:
      using mutex_type = _Mutex;

explicit scoped_lock(mutex_type& __m) : _M_device(__m)
      { _M_device.lock(); }

explicit scoped_lock(adopt_lock_t, mutex_type& __m) noexcept
      : _M_device(__m)
      { } // calling thread owns mutex

~scoped_lock()
      { _M_device.unlock(); }

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

private:
      mutex_type&  _M_device;
    };
#endif // C++17

#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)();
#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)
    {
      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 2442. call_once() shouldn't DECAY_COPY()
      auto __callable = [&] {
	  std::__invoke(std::forward<_Callable>(__f),
			std::forward<_Args>(__args)...);
      };
#ifdef _GLIBCXX_HAVE_TLS
      __once_callable = std::__addressof(__callable); // NOLINT: PR 82481
      __once_call = []{ (*(decltype(__callable)*)__once_callable)(); };
#else
      unique_lock<mutex> __functor_lock(__get_once_mutex());
      __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

Back