xref: /freebsd/contrib/llvm-project/libcxx/include/__cxx03/condition_variable (revision 700637cbb5e582861067a11aaca4d053546871d2)

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___CXX03_CONDITION_VARIABLE
#define _LIBCPP___CXX03_CONDITION_VARIABLE

/*
    condition_variable synopsis

namespace std
{

enum class cv_status { no_timeout, timeout };

class condition_variable
{
public:
    condition_variable();
    ~condition_variable();

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

    void notify_one() noexcept;
    void notify_all() noexcept;

    void wait(unique_lock<mutex>& lock);
    template <class Predicate>
        void wait(unique_lock<mutex>& lock, Predicate pred);

    template <class Clock, class Duration>
        cv_status
        wait_until(unique_lock<mutex>& lock,
                   const chrono::time_point<Clock, Duration>& abs_time);

    template <class Clock, class Duration, class Predicate>
        bool
        wait_until(unique_lock<mutex>& lock,
                   const chrono::time_point<Clock, Duration>& abs_time,
                   Predicate pred);

    template <class Rep, class Period>
        cv_status
        wait_for(unique_lock<mutex>& lock,
                 const chrono::duration<Rep, Period>& rel_time);

    template <class Rep, class Period, class Predicate>
        bool
        wait_for(unique_lock<mutex>& lock,
                 const chrono::duration<Rep, Period>& rel_time,
                 Predicate pred);

    typedef pthread_cond_t* native_handle_type;
    native_handle_type native_handle();
};

void notify_all_at_thread_exit(condition_variable& cond, unique_lock<mutex> lk);

class condition_variable_any
{
public:
    condition_variable_any();
    ~condition_variable_any();

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

    void notify_one() noexcept;
    void notify_all() noexcept;

    template <class Lock>
        void wait(Lock& lock);
    template <class Lock, class Predicate>
        void wait(Lock& lock, Predicate pred);

    template <class Lock, class Clock, class Duration>
        cv_status
        wait_until(Lock& lock,
                   const chrono::time_point<Clock, Duration>& abs_time);

    template <class Lock, class Clock, class Duration, class Predicate>
        bool
        wait_until(Lock& lock,
                   const chrono::time_point<Clock, Duration>& abs_time,
                   Predicate pred);

    template <class Lock, class Rep, class Period>
        cv_status
        wait_for(Lock& lock,
                 const chrono::duration<Rep, Period>& rel_time);

    template <class Lock, class Rep, class Period, class Predicate>
        bool
        wait_for(Lock& lock,
                 const chrono::duration<Rep, Period>& rel_time,
                 Predicate pred);

    // [thread.condvarany.intwait], interruptible waits
    template <class Lock, class Predicate>
      bool wait(Lock& lock, stop_token stoken, Predicate pred);                               // since C++20

    template <class Lock, class Clock, class Duration, class Predicate>
      bool wait_until(Lock& lock, stop_token stoken,
                      const chrono::time_point<Clock, Duration>& abs_time, Predicate pred);   // since C++20

    template <class Lock, class Rep, class Period, class Predicate>
      bool wait_for(Lock& lock, stop_token stoken,
                    const chrono::duration<Rep, Period>& rel_time, Predicate pred);           // since C++20
};

}  // std

*/

#include <__cxx03/__chrono/duration.h>
#include <__cxx03/__chrono/steady_clock.h>
#include <__cxx03/__chrono/time_point.h>
#include <__cxx03/__condition_variable/condition_variable.h>
#include <__cxx03/__config>
#include <__cxx03/__memory/shared_ptr.h>
#include <__cxx03/__mutex/lock_guard.h>
#include <__cxx03/__mutex/mutex.h>
#include <__cxx03/__mutex/tag_types.h>
#include <__cxx03/__mutex/unique_lock.h>
#include <__cxx03/__utility/move.h>
#include <__cxx03/version>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__cxx03/__undef_macros>

#ifndef _LIBCPP_HAS_NO_THREADS

_LIBCPP_BEGIN_NAMESPACE_STD

class _LIBCPP_EXPORTED_FROM_ABI condition_variable_any {
  condition_variable __cv_;
  shared_ptr<mutex> __mut_;

public:
  _LIBCPP_HIDE_FROM_ABI condition_variable_any();

  _LIBCPP_HIDE_FROM_ABI void notify_one() _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI void notify_all() _NOEXCEPT;

  template <class _Lock>
  _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS void wait(_Lock& __lock);
  template <class _Lock, class _Predicate>
  _LIBCPP_HIDE_FROM_ABI void wait(_Lock& __lock, _Predicate __pred);

  template <class _Lock, class _Clock, class _Duration>
  _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS cv_status
  wait_until(_Lock& __lock, const chrono::time_point<_Clock, _Duration>& __t);

  template <class _Lock, class _Clock, class _Duration, class _Predicate>
  bool _LIBCPP_HIDE_FROM_ABI
  wait_until(_Lock& __lock, const chrono::time_point<_Clock, _Duration>& __t, _Predicate __pred);

  template <class _Lock, class _Rep, class _Period>
  cv_status _LIBCPP_HIDE_FROM_ABI wait_for(_Lock& __lock, const chrono::duration<_Rep, _Period>& __d);

  template <class _Lock, class _Rep, class _Period, class _Predicate>
  bool _LIBCPP_HIDE_FROM_ABI wait_for(_Lock& __lock, const chrono::duration<_Rep, _Period>& __d, _Predicate __pred);
};

inline condition_variable_any::condition_variable_any() : __mut_(make_shared<mutex>()) {}

inline void condition_variable_any::notify_one() _NOEXCEPT {
  { lock_guard<mutex> __lx(*__mut_); }
  __cv_.notify_one();
}

inline void condition_variable_any::notify_all() _NOEXCEPT {
  { lock_guard<mutex> __lx(*__mut_); }
  __cv_.notify_all();
}

template <class _Lock>
struct __unlock_guard {
  _Lock& __lock_;

  _LIBCPP_HIDE_FROM_ABI __unlock_guard(_Lock& __lock) : __lock_(__lock) { __lock_.unlock(); }

  _LIBCPP_HIDE_FROM_ABI ~__unlock_guard() _NOEXCEPT // turns exception to std::terminate
  {
    __lock_.lock();
  }

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

template <class _Lock>
void condition_variable_any::wait(_Lock& __lock) {
  shared_ptr<mutex> __mut = __mut_;
  unique_lock<mutex> __lk(*__mut);
  __unlock_guard<_Lock> __unlock(__lock);
  lock_guard<unique_lock<mutex> > __lx(__lk, adopt_lock_t());
  __cv_.wait(__lk);
} // __mut_.unlock(), __lock.lock()

template <class _Lock, class _Predicate>
inline void condition_variable_any::wait(_Lock& __lock, _Predicate __pred) {
  while (!__pred())
    wait(__lock);
}

template <class _Lock, class _Clock, class _Duration>
cv_status condition_variable_any::wait_until(_Lock& __lock, const chrono::time_point<_Clock, _Duration>& __t) {
  shared_ptr<mutex> __mut = __mut_;
  unique_lock<mutex> __lk(*__mut);
  __unlock_guard<_Lock> __unlock(__lock);
  lock_guard<unique_lock<mutex> > __lx(__lk, adopt_lock_t());
  return __cv_.wait_until(__lk, __t);
} // __mut_.unlock(), __lock.lock()

template <class _Lock, class _Clock, class _Duration, class _Predicate>
inline bool
condition_variable_any::wait_until(_Lock& __lock, const chrono::time_point<_Clock, _Duration>& __t, _Predicate __pred) {
  while (!__pred())
    if (wait_until(__lock, __t) == cv_status::timeout)
      return __pred();
  return true;
}

template <class _Lock, class _Rep, class _Period>
inline cv_status condition_variable_any::wait_for(_Lock& __lock, const chrono::duration<_Rep, _Period>& __d) {
  return wait_until(__lock, chrono::steady_clock::now() + __d);
}

template <class _Lock, class _Rep, class _Period, class _Predicate>
inline bool
condition_variable_any::wait_for(_Lock& __lock, const chrono::duration<_Rep, _Period>& __d, _Predicate __pred) {
  return wait_until(__lock, chrono::steady_clock::now() + __d, std::move(__pred));
}

_LIBCPP_EXPORTED_FROM_ABI void notify_all_at_thread_exit(condition_variable&, unique_lock<mutex>);

_LIBCPP_END_NAMESPACE_STD

#endif // !_LIBCPP_HAS_NO_THREADS

_LIBCPP_POP_MACROS

#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES)
#  include <__cxx03/atomic>
#  include <__cxx03/cstdint>
#  include <__cxx03/cstdlib>
#  include <__cxx03/cstring>
#  include <__cxx03/iosfwd>
#  include <__cxx03/new>
#  include <__cxx03/stdexcept>
#  include <__cxx03/system_error>
#  include <__cxx03/type_traits>
#  include <__cxx03/typeinfo>
#endif

#endif // _LIBCPP___CXX03_CONDITION_VARIABLE