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// -*- 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_CONDITION_VARIABLE
#define _LIBCPP_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);
};
} // std
*/
#include <__assert> // all public C++ headers provide the assertion handler
#include <__config>
#include <__mutex_base>
#include <memory>
#include <version>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
#ifndef _LIBCPP_HAS_NO_THREADS
_LIBCPP_BEGIN_NAMESPACE_STD
class _LIBCPP_TYPE_VIS condition_variable_any
{
condition_variable __cv_;
shared_ptr<mutex> __mut_;
public:
_LIBCPP_INLINE_VISIBILITY
condition_variable_any();
_LIBCPP_INLINE_VISIBILITY
void notify_one() _NOEXCEPT;
_LIBCPP_INLINE_VISIBILITY
void notify_all() _NOEXCEPT;
template <class _Lock>
_LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
void wait(_Lock& __lock);
template <class _Lock, class _Predicate>
_LIBCPP_INLINE_VISIBILITY
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_INLINE_VISIBILITY
wait_until(_Lock& __lock,
const chrono::time_point<_Clock, _Duration>& __t,
_Predicate __pred);
template <class _Lock, class _Rep, class _Period>
cv_status
_LIBCPP_INLINE_VISIBILITY
wait_for(_Lock& __lock,
const chrono::duration<_Rep, _Period>& __d);
template <class _Lock, class _Rep, class _Period, class _Predicate>
bool
_LIBCPP_INLINE_VISIBILITY
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();
}
struct __lock_external
{
template <class _Lock>
void operator()(_Lock* __m) {__m->lock();}
};
template <class _Lock>
void
condition_variable_any::wait(_Lock& __lock)
{
shared_ptr<mutex> __mut = __mut_;
unique_lock<mutex> __lk(*__mut);
__lock.unlock();
unique_ptr<_Lock, __lock_external> __lxx(&__lock);
lock_guard<unique_lock<mutex> > __lx(__lk, adopt_lock);
__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);
__lock.unlock();
unique_ptr<_Lock, __lock_external> __lxx(&__lock);
lock_guard<unique_lock<mutex> > __lx(__lk, adopt_lock);
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,
_VSTD::move(__pred));
}
_LIBCPP_FUNC_VIS
void notify_all_at_thread_exit(condition_variable&, unique_lock<mutex>);
_LIBCPP_END_NAMESPACE_STD
#endif // !_LIBCPP_HAS_NO_THREADS
#endif // _LIBCPP_CONDITION_VARIABLE
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