// fastlane_direct_env_box.c - Phase 19-1: FastLane Direct Path ENV Control (implementation)

#include "fastlane_direct_env_box.h"
#include <stdlib.h>
#include <stdatomic.h>

_Atomic int g_fastlane_direct_enabled = -1;

// Refresh cached ENV flag from environment variable
// Called during benchmark ENV reloads to pick up runtime changes
void fastlane_direct_env_refresh_from_env(void) {
    const char* e = getenv("HAKMEM_FASTLANE_DIRECT");
    int enable = (e && *e && *e != '0') ? 1 : 0;
    atomic_store_explicit(&g_fastlane_direct_enabled, enable, memory_order_relaxed);
}