linux-sgx-trts-modified/sdk/tlibcxx/include/support/sgx/sgx_condition_variable

// -*- C++ -*-
//===---------------------- condition_variable ----------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_SGX_CONDITION_VARIABLE
#define _LIBCPP_SGX_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);

    Not supported (time API) : template <class Clock, class Duration>
        cv_status
        wait_until(unique_lock<mutex>& lock,
                   const chrono::time_point<Clock, Duration>& abs_time);

    Not supported (time API) : template <class Clock, class Duration, class Predicate>
        bool
        wait_until(unique_lock<mutex>& lock,
                   const chrono::time_point<Clock, Duration>& abs_time,
                   Predicate pred);

    Not supported (time API) : template <class Rep, class Period>
        cv_status
        wait_for(unique_lock<mutex>& lock,
                 const chrono::duration<Rep, Period>& rel_time);

    Not supported (time API) : template <class Rep, class Period, class Predicate>
        bool
        wait_for(unique_lock<mutex>& lock,
                 const chrono::duration<Rep, Period>& rel_time,
                 Predicate pred);


    typedef sgx_thread_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);


    Not supported (time API) : template <class Lock, class Clock, class Duration>
        cv_status
        wait_until(Lock& lock,
                   const chrono::time_point<Clock, Duration>& abs_time);

    Not supported (time API) : template <class Lock, class Clock, class Duration, class Predicate>
        bool
        wait_until(Lock& lock,
                   const chrono::time_point<Clock, Duration>& abs_time,
                   Predicate pred);

    Not supported (time API) : template <class Lock, class Rep, class Period>
        cv_status
        wait_for(Lock& lock,
                 const chrono::duration<Rep, Period>& rel_time);

    Not supported (time API) : 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 <__config>

#include <sgx_thread.h>

#include <support/sgx/__sgx_mutex_base>
#include <memory>

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

_LIBCPP_BEGIN_NAMESPACE_STD

class _LIBCPP_TYPE_VIS condition_variable_any
{
    condition_variable __cv_;
    shared_ptr<mutex>  __mut_;
public:
    condition_variable_any();

    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);
};

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

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

inline _LIBCPP_INLINE_VISIBILITY
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 _LIBCPP_INLINE_VISIBILITY
void
condition_variable_any::wait(_Lock& __lock, _Predicate __pred)
{
    while (!__pred())
        wait(__lock);
}

_LIBCPP_END_NAMESPACE_STD

#endif  // _LIBCPP_SGX_CONDITION_VARIABLE