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change arena allocator to atomic bitmap as well

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This commit is contained in:
daan 2019-11-06 22:49:01 -08:00
parent 00e19cad9a
commit b09282bc0d
5 changed files with 94 additions and 208 deletions
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6
src/bitmap.inc.c
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@ -135,13 +135,15 @@ static inline bool mi_bitmap_try_claim(mi_bitmap_t bitmap, size_t bitmap_fields,
}
// Set `count` bits at `bitmap_idx` to 0 atomically
static inline void mi_bitmap_unclaim(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx) {
// Returns `true` if all `count` bits were 1 previously
static inline bool mi_bitmap_unclaim(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx) {
const size_t idx = mi_bitmap_index_field(bitmap_idx);
const size_t bitidx = mi_bitmap_index_bit_in_field(bitmap_idx);
const uintptr_t mask = mi_bitmap_mask_(count, bitidx);
mi_assert_internal(bitmap_fields > idx); UNUSED(bitmap_fields);
mi_assert_internal((bitmap[idx] & mask) == mask);
mi_atomic_and(&bitmap[idx], ~mask);
uintptr_t prev = mi_atomic_and(&bitmap[idx], ~mask);
return ((prev & mask) == mask);
}