hakmem/core/box/ss_slab_reset_box.h

// ss_slab_reset_box.h
// Box: Reset TinySlabMeta for reuse (C7 diagnostics-friendly)
#pragma once

#include "ss_slab_meta_box.h"
#include "../superslab/superslab_inline.h"
#include <stdatomic.h>

static inline void ss_slab_reset_meta_for_tiny(SuperSlab* ss,
                                               int slab_idx,
                                               int class_idx)
{
    if (!ss) return;
    if (slab_idx < 0 || slab_idx >= ss_slabs_capacity(ss)) return;

    // class_idx < 0 means "unassigned" (255). Otherwise keep the requested class.
    uint8_t target_class = (class_idx < 0) ? 255u : (uint8_t)class_idx;

    TinySlabMeta* meta = &ss->slabs[slab_idx];
    meta->used = 0;
    meta->carved = 0;
    meta->freelist = NULL;
    meta->class_idx = target_class;
    ss->class_map[slab_idx] = target_class;

    // Reset remote queue state to avoid stale pending frees on reuse.
    atomic_store_explicit(&ss->remote_heads[slab_idx], 0, memory_order_relaxed);
    atomic_store_explicit(&ss->remote_counts[slab_idx], 0, memory_order_relaxed);
}