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Fallback to 32-bit when 8-bit atomics are missing for TSD.

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When it happens, this might cause a slowdown on the fast path operations.
However such case is very rare.
This commit is contained in:
Qi Wang 2019-03-07 16:01:55 -08:00 • committed by Qi Wang
parent 06f0850427
commit b804d0f019
2 changed files with 24 additions and 8 deletions
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19
include/jemalloc/internal/tsd.h
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@ -169,6 +169,18 @@ enum {
*/
#define TSD_MANGLE(n) cant_access_tsd_items_directly_use_a_getter_or_setter_##n
#ifdef JEMALLOC_U8_ATOMICS
# define tsd_state_t atomic_u8_t
# define tsd_atomic_load atomic_load_u8
# define tsd_atomic_store atomic_store_u8
# define tsd_atomic_exchange atomic_exchange_u8
#else
# define tsd_state_t atomic_u32_t
# define tsd_atomic_load atomic_load_u32
# define tsd_atomic_store atomic_store_u32
# define tsd_atomic_exchange atomic_exchange_u32
#endif
/* The actual tsd. */
struct tsd_s {
/*
@ -177,8 +189,11 @@ struct tsd_s {
* setters below.
*/
/* We manually limit the state to just a single byte. */
atomic_u8_t state;
/*
* We manually limit the state to just a single byte. Unless the 8-bit
* atomics are unavailable (which is rare).
*/
tsd_state_t state;
#define O(n, t, nt) \
t TSD_MANGLE(n);
MALLOC_TSD