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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2021-04-27 flybreak the first version.
*/
#include "mutex"
namespace std
{
// use a set of global and static objects
// a proxy function to pthread_once
function<void()> once_functor;
mutex& get_once_mutex()
{
static mutex once_mutex;
return once_mutex;
}
inline unique_lock<mutex>*& get_once_functor_lock_ptr()
{
static unique_lock<mutex>* once_functor_mutex_ptr = nullptr;
return once_functor_mutex_ptr;
}
void set_once_functor_lock_ptr(unique_lock<mutex>* m_ptr)
{
get_once_functor_lock_ptr() = m_ptr;
}
extern "C"
{
void once_proxy()
{
// need to first transfer the functor's ownership so as to call it
function<void()> once_call = std::move(once_functor);
// no need to hold the lock anymore
unique_lock<mutex>* lock_ptr = get_once_functor_lock_ptr();
get_once_functor_lock_ptr() = nullptr;
lock_ptr->unlock();
once_call();
}
}
}
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