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reduce memory order constraints for better efficiency on ARM etc

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This commit is contained in:
daan 2020-07-26 11:58:02 -07:00
parent 116159cd40
commit a9f46dc86f
3 changed files with 21 additions and 10 deletions
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2
src/page.c
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@ -159,7 +159,7 @@ static void _mi_page_thread_free_collect(mi_page_t* page)
do {
head = mi_tf_block(tfree);
tfreex = mi_tf_set_block(tfree,NULL);
} while (!mi_atomic_cas_weak(&page->xthread_free, &tfree, tfreex));
} while (!mi_atomic_cas_weak_acq_rel(&page->xthread_free, &tfree, tfreex));
// return if the list is empty
if (head == NULL) return;

2
src/segment.c
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@ -982,7 +982,7 @@ static mi_segment_t* mi_abandoned_pop(void) {
mi_segment_t* anext = mi_atomic_read_ptr_relaxed(mi_segment_t, &segment->abandoned_next);
next = mi_tagged_segment(anext, ts); // note: reads the segment's `abandoned_next` field so should not be decommitted
}
} while (segment != NULL && !mi_atomic_cas_weak(&abandoned, &ts, next));
} while (segment != NULL && !mi_atomic_cas_weak_acq_rel(&abandoned, &ts, next));
mi_atomic_decrement(&abandoned_readers); // release reader lock
if (segment != NULL) {
mi_atomic_write_ptr(mi_segment_t, &segment->abandoned_next, NULL);