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Transition arena struct fields to C11 atomics

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David Goldblatt 2017-04-04 17:22:24 -07:00 • committed by David Goldblatt
parent bc32ec3503
commit 56b72c7b17
3 changed files with 48 additions and 39 deletions
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15
src/extent.c
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@ -913,7 +913,8 @@ extent_alloc_default_impl(tsdn_t *tsdn, arena_t *arena, void *new_addr,
void *ret;
ret = extent_alloc_core(tsdn, arena, new_addr, size, alignment, zero,
commit, arena->dss_prec);
commit, (dss_prec_t)atomic_load_u(&arena->dss_prec,
ATOMIC_RELAXED));
return ret;
}
@ -956,7 +957,8 @@ extent_grow_retained(tsdn_t *tsdn, arena_t *arena,
* extent creation as a side effect.
*/
size_t esize = size + pad;
size_t alloc_size = pind2sz(atomic_read_u(&arena->extent_grow_next));
size_t alloc_size = pind2sz(atomic_load_u(&arena->extent_grow_next,
ATOMIC_RELAXED));
size_t alloc_size_min = esize + PAGE_CEILING(alignment) - PAGE;
/* Beware size_t wrap-around. */
if (alloc_size_min < esize) {
@ -972,7 +974,8 @@ extent_grow_retained(tsdn_t *tsdn, arena_t *arena,
bool zeroed = false;
bool committed = false;
void *ptr = extent_alloc_core(tsdn, arena, new_addr, alloc_size, PAGE,
&zeroed, &committed, arena->dss_prec);
&zeroed, &committed, (dss_prec_t)atomic_load_u(&arena->dss_prec,
ATOMIC_RELAXED));
extent_init(extent, arena, ptr, alloc_size, false, NSIZES,
arena_extent_sn_next(arena), extent_state_active, zeroed,
committed);
@ -1078,14 +1081,14 @@ extent_grow_retained(tsdn_t *tsdn, arena_t *arena,
* Increment extent_grow_next, but take care to do so atomically and
* bail out if the increment would exceed the legal range.
*/
pszind_t egn = atomic_load_u(&arena->extent_grow_next, ATOMIC_RELAXED);
while (true) {
pszind_t egn = atomic_read_u(&arena->extent_grow_next);
if (egn + 1 == NPSIZES) {
break;
}
assert(egn + 1 < NPSIZES);
if (!atomic_cas_u(&arena->extent_grow_next, egn, egn + 1)) {
if (atomic_compare_exchange_weak_u(&arena->extent_grow_next,
&egn, egn + 1, ATOMIC_RELAXED, ATOMIC_RELAXED)) {
break;
}
}