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fix atomic access for MADV_FREE in os_reset

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This commit is contained in:
daan 2020-07-26 00:16:17 -07:00
parent ebf951e851
commit 28014ee2bc
1 changed files with 4 additions and 4 deletions
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8
src/os.c
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@ -759,12 +759,12 @@ static bool mi_os_resetx(void* addr, size_t size, bool reset, mi_stats_t* stats)
if (p != start) return false;
#else
#if defined(MADV_FREE)
static int advice = MADV_FREE;
int err = madvise(start, csize, advice);
static _Atomic(uintptr_t) advice = ATOMIC_VAR_INIT(MADV_FREE);
int err = madvise(start, csize, (int)mi_atomic_read_relaxed(&advice));
if (err != 0 && errno == EINVAL && advice == MADV_FREE) {
// if MADV_FREE is not supported, fall back to MADV_DONTNEED from now on
advice = MADV_DONTNEED;
err = madvise(start, csize, advice);
mi_atomic_write(&advice, MADV_DONTNEED);
err = madvise(start, csize, MADV_DONTNEED);
}
#elif defined(__wasi__)
int err = 0;