hakmem/core/box/learner_env_box.h

// learner_env_box.h - Learning Layer ENV Box
// Purpose: Decide whether CAP Learner thread should run, based on HAKMEM_MODE
//          and HAKMEM_LEARN, without touchingホットパス。
//
// Priority:
//   1. HAKMEM_LEARN is set → 0/1 で明示的に上書き
//   2. 未設定の場合:
//        HAKMEM_MODE=learning/research → Learner 有効
//        それ以外（minimal/fast/balanced） → Learner 無効

#pragma once

#include "../hakmem_config.h"
#include "../hakmem_build_flags.h"
#include <stdlib.h>

static inline int hak_learner_env_should_run(void) {
#if HAKMEM_BENCH_MINIMAL || HAKMEM_FAST_PROFILE_FIXED || HAKMEM_FAST_PROFILE_PRUNE_BACKENDS
    // Phase 63/64: Disable learning layer in FAST profile-fixed/pruned builds
    return 0;
#endif
    static int g_inited = 0;
    static int g_effective = 0;
    if (__builtin_expect(!g_inited, 0)) {
        const char* e = getenv("HAKMEM_LEARN");
        if (e && *e) {
            int v = atoi(e);
            g_effective = (v != 0) ? 1 : 0;
        } else {
            HakemMode m = g_hakem_config.mode;
            g_effective =
                (m == HAKMEM_MODE_LEARNING || m == HAKMEM_MODE_RESEARCH) ? 1 : 0;
        }
        g_inited = 1;
    }
    return g_effective;
}