gp_ref_count.h

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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
 * Copyright (C) 2024 Cyril Hrubis <metan@ucw.cz>
 */

 
#ifndef CORE_GP_REF_COUNT_H
#define CORE_GP_REF_COUNT_H
 
#include <limits.h>
#include <stdbool.h>
 
typedef unsigned int gp_refcnt;
 
static inline bool gp_refcnt_inc(gp_refcnt *self)
{
        gp_refcnt new_val, old_val;
 
        do {
                old_val = *self;
 
                if (!old_val)
                        return false;
 
                if (old_val == UINT_MAX)
                        return true;
 
                new_val = old_val + 1;
 
        } while (!__sync_bool_compare_and_swap(self, old_val, new_val));
 
        return true;
}
 
static inline bool gp_refcnt_dec(gp_refcnt *self)
{
        gp_refcnt new_val, old_val;
 
        do {
                old_val = *self;
 
                if (old_val == UINT_MAX)
                        return false;
 
                
        }
}
 
#endif /* CORE_GP_REF_COUNT_H */