Guard madvise ENOMEM and stabilize pool/tiny front v3

core/box/smallobject_cold_iface_v1.h

@@ -0,0 +1,80 @@
+// smallobject_cold_iface_v1.h - Cold interface wrapper for SmallObject HotBox v3
+// 役割:
+//   - SmallObject Hot Box (v3) と既存 v1 Tiny Cold 層の境界を 1 箇所にまとめる。
+//   - Phase A: C7 の refill/retire だけを v1 TinyHeap へラップする。
+#pragma once
+
+#include <stdint.h>
+#include <stdlib.h>
+#include "tiny_heap_box.h"
+#include "smallobject_hotbox_v3_box.h"
+#include "../hakmem_tiny.h"  // TINY_SLAB_SIZE for slab base mask
+
+struct so_page_v3;
+
+typedef struct SmallObjectColdIface {
+    struct so_page_v3* (*refill_page)(void* cold_ctx, uint32_t class_idx);
+    void (*retire_page)(void* cold_ctx, uint32_t class_idx, struct so_page_v3* page);
+} SmallObjectColdIface;
+
+static inline struct so_page_v3* smallobject_cold_refill_page_v1(void* cold_ctx, uint32_t class_idx) {
+    if (class_idx != 7 && class_idx != 6) {
+        return NULL;  // Phase A-2: C7/C6 のみ対応
+    }
+    tiny_heap_ctx_t* ctx = cold_ctx ? (tiny_heap_ctx_t*)cold_ctx : tiny_heap_ctx_for_thread();
+    if (!ctx) return NULL;
+    tiny_heap_page_t* lease = tiny_heap_prepare_page(ctx, (int)class_idx);
+    if (!lease) return NULL;
+
+    so_page_v3* page = (so_page_v3*)calloc(1, sizeof(so_page_v3));
+    if (!page) return NULL;
+
+    page->lease_page = lease;
+    page->meta = lease->meta;
+    page->ss = lease->ss;
+    page->slab_idx = lease->slab_idx;
+    page->base = lease->base;
+    page->capacity = lease->capacity;
+    page->block_size = (uint32_t)tiny_stride_for_class((int)class_idx);
+    page->class_idx = class_idx;
+    page->slab_ref = lease;
+    return page;
+}
+
+static inline void smallobject_cold_retire_page_v1(void* cold_ctx, uint32_t class_idx, struct so_page_v3* page) {
+    if (!page || (class_idx != 7 && class_idx != 6)) {
+        if (page) {
+            free(page);
+        }
+        return;
+    }
+    tiny_heap_ctx_t* ctx = cold_ctx ? (tiny_heap_ctx_t*)cold_ctx : tiny_heap_ctx_for_thread();
+    if (!ctx) {
+        free(page);
+        return;
+    }
+    tiny_heap_page_t* lease = page->lease_page;
+    if (!lease) {
+        free(page);
+        return;
+    }
+
+    lease->base = (uint8_t*)page->base;
+    lease->capacity = (uint16_t)page->capacity;
+    lease->used = (uint16_t)page->used;
+    lease->meta = page->meta;
+    lease->ss = page->ss;
+    lease->slab_idx = page->slab_idx;
+    lease->free_list = page->freelist;
+
+    tiny_heap_page_becomes_empty(ctx, (int)class_idx, lease);
+    free(page);
+}
+
+static inline SmallObjectColdIface smallobject_cold_iface_v1(void) {
+    SmallObjectColdIface iface = {
+        .refill_page = smallobject_cold_refill_page_v1,
+        .retire_page = smallobject_cold_retire_page_v1,
+    };
+    return iface;
+}