26 lines
1.1 KiB
C
26 lines
1.1 KiB
C
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// wrapper_env_cache_box.h - TLS cache layer for wrapper env config (Phase 3 D2)
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// Purpose: Eliminate repeated wrapper_env_cfg() calls in malloc/free hot path
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// Strategy: Cache the const pointer in TLS (safe, no refresh sync needed)
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#pragma once
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#include "wrapper_env_box.h" // wrapper_env_cfg()
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#include "wrapper_env_cache_env_box.h" // wrap_env_cache_enabled()
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// Fast pointer cache: TLS caches the pointer to g_wrapper_env
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// Safety: wrapper_env_refresh_from_env() doesn't change the pointer address,
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// only the content of g_wrapper_env, so TLS cache remains valid.
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static inline const wrapper_env_cfg_t* wrapper_env_cfg_fast(void) {
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if (__builtin_expect(!wrap_env_cache_enabled(), 1)) {
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// Cache disabled (default): use baseline wrapper_env_cfg()
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return wrapper_env_cfg();
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}
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// Cache enabled: TLS fast pointer
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static __thread const wrapper_env_cfg_t* cached_ptr = NULL;
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if (__builtin_expect(cached_ptr == NULL, 0)) {
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// First access: initialize TLS cache with pointer to g_wrapper_env
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cached_ptr = wrapper_env_cfg();
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}
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return cached_ptr;
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}
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