kiper220/mimalloc
1
0
Fork 0
mirror of https://github.com/microsoft/mimalloc.git synced 2025-07-09 21:08:42 +03:00
Code Issues Projects Releases Packages Wiki Activity Actions

refactor regions; add commit tracking on a segment basis

Browse source
This commit is contained in:
Daan Leijen 2019-11-09 19:30:53 -08:00
parent 7b72a4cd50
commit 9f08ddd0d0
4 changed files with 181 additions and 226 deletions
Download patch file Download diff file Expand all files Collapse all files

14
src/bitmap.inc.c
View file

@ -61,6 +61,7 @@ static inline size_t mi_bitmap_index_bit(mi_bitmap_index_t bitmap_idx) {
// The bit mask for a given number of blocks at a specified bit index.
static uintptr_t mi_bitmap_mask_(size_t count, size_t bitidx) {
mi_assert_internal(count + bitidx <= MI_BITMAP_FIELD_BITS);
if (count == MI_BITMAP_FIELD_BITS) return MI_BITMAP_FIELD_FULL;
return ((((uintptr_t)1 << count) - 1) << bitidx);
}
@ -183,14 +184,25 @@ static inline bool mi_bitmap_unclaim(mi_bitmap_t bitmap, size_t bitmap_fields, s
// Set `count` bits at `bitmap_idx` to 1 atomically
// Returns `true` if all `count` bits were 0 previously
static inline bool mi_bitmap_claim(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx) {
static inline bool mi_bitmap_claim(mi_bitmap_t bitmap, size_t bitmap_fields, size_t count, mi_bitmap_index_t bitmap_idx, bool* any_zero) {
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) == 0);
uintptr_t prev = mi_atomic_or(&bitmap[idx], mask);
if (any_zero != NULL) *any_zero = ((prev & mask) != mask);
return ((prev & mask) == 0);
}
// Returns `true` if all `count` bits were 1
static inline bool mi_bitmap_is_claimed(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) == 0);
return ((mi_atomic_read(&bitmap[idx]) & mask) == mask);
}
#endif