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Avoid arena->offset_state when tsd not available for prng.

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Use stack locals and remove the offset_state in arena.
This commit is contained in:
Qi Wang 2019-11-04 16:44:37 -08:00 • committed by Qi Wang
parent d01b425e5d
commit 19a51abf33
3 changed files with 2 additions and 22 deletions
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4
src/extent.c
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@ -187,8 +187,8 @@ extent_addr_randomize(tsdn_t *tsdn, arena_t *arena, extent_t *extent,
r = (size_t)prng_lg_range_u64(
tsd_offset_statep_get(tsd), lg_range);
} else {
r = prng_lg_range_zu(&arena->offset_state, lg_range,
true);
uint64_t stack_value = (uint64_t)(uintptr_t)&r;
r = (size_t)prng_lg_range_u64(&stack_value, lg_range);
}
uintptr_t random_offset = ((uintptr_t)r) << (LG_PAGE -
lg_range);