shareable.h

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#pragma once
 
#include <uacpi/types.h>
#include <uacpi/platform/atomic.h>
 
#ifndef UACPI_BAREBONES_MODE
 
#define UACPI_SHAREABLE_BUGGED_REFCOUNT 0xFFFFFFFF
 
struct uacpi_shareable {
    uacpi_u32 reference_count;
};
 
static inline void uacpi_shareable_init(uacpi_handle handle)
{
    struct uacpi_shareable *shareable = handle;
    shareable->reference_count = 1;
}
 
static inline void uacpi_make_shareable_bugged(uacpi_handle handle)
{
    struct uacpi_shareable *shareable = handle;
 
    uacpi_atomic_store32(
        &shareable->reference_count, UACPI_SHAREABLE_BUGGED_REFCOUNT
    );
}
 
static inline uacpi_bool uacpi_bugged_shareable(uacpi_handle handle)
{
    struct uacpi_shareable *shareable = handle;
 
    if (uacpi_unlikely(uacpi_atomic_load32(&shareable->reference_count) == 0))
        uacpi_make_shareable_bugged(shareable);
 
    return uacpi_atomic_load32(&shareable->reference_count) ==
           UACPI_SHAREABLE_BUGGED_REFCOUNT;
}
 
static inline uacpi_u32 uacpi_shareable_ref(uacpi_handle handle)
{
    struct uacpi_shareable *shareable = handle;
 
    if (uacpi_unlikely(uacpi_bugged_shareable(shareable)))
        return UACPI_SHAREABLE_BUGGED_REFCOUNT;
 
    return uacpi_atomic_inc32(&shareable->reference_count) - 1;
}
 
static inline uacpi_u32 uacpi_shareable_unref(uacpi_handle handle)
{
    struct uacpi_shareable *shareable = handle;
 
    if (uacpi_unlikely(uacpi_bugged_shareable(shareable)))
        return UACPI_SHAREABLE_BUGGED_REFCOUNT;
 
    return uacpi_atomic_dec32(&shareable->reference_count) + 1;
}
 
static inline void uacpi_shareable_unref_and_delete_if_last(
    uacpi_handle handle, void (*do_free)(uacpi_handle)
)
{
    if (handle == UACPI_NULL)
        return;
 
    if (uacpi_unlikely(uacpi_bugged_shareable(handle)))
        return;
 
    if (uacpi_shareable_unref(handle) == 1)
        do_free(handle);
}
 
static inline uacpi_u32 uacpi_shareable_refcount(uacpi_handle handle)
{
    struct uacpi_shareable *shareable = handle;
    return uacpi_atomic_load32(&shareable->reference_count);
}
 
#endif // !UACPI_BAREBONES_MODE