static struct malloc_arena*
_int_new_arena(size_t size)
{
struct malloc_arena* a;
size_t mmap_sz = sizeof(*a) + pad_request(size);
void *m;
if (mmap_sz < ARENA_SIZE_MIN)
mmap_sz = ARENA_SIZE_MIN;
/* conservative estimate for page size */
mmap_sz = (mmap_sz + 8191) & ~(size_t)8191;
a = CALL_MMAP(mmap_sz);
if ((char*)a == (char*)-1)
return 0;
m = create_mspace_with_base((char*)a + MSPACE_OFFSET,
mmap_sz - MSPACE_OFFSET,
0);
if (!m) {
CALL_MUNMAP(a, mmap_sz);
a = 0;
} else {
/*a->next = NULL;*/
/*a->system_mem = a->max_system_mem = h->size;*/
}
return a;
}
//This function is equal to mspace_malloc
//replacing PREACTION with 0 and POSTACTION with nothing
void* mspace_malloc_lockless(mspace msp, size_t bytes)
{
mstate ms = (mstate)msp;
if (!ok_magic(ms)) {
USAGE_ERROR_ACTION(ms,ms);
return 0;
}
if (!0){//PREACTION(ms)) {
void* mem;
size_t nb;
if (bytes <= MAX_SMALL_REQUEST) {
bindex_t idx;
binmap_t smallbits;
nb = (bytes < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(bytes);
idx = small_index(nb);
smallbits = ms->smallmap >> idx;
if ((smallbits & 0x3U) != 0) { /* Remainderless fit to a smallbin. */
mchunkptr b, p;
idx += ~smallbits & 1; /* Uses next bin if idx empty */
b = smallbin_at(ms, idx);
p = b->fd;
assert(chunksize(p) == small_index2size(idx));
unlink_first_small_chunk(ms, b, p, idx);
set_inuse_and_pinuse(ms, p, small_index2size(idx));
mem = chunk2mem(p);
check_malloced_chunk(ms, mem, nb);
goto postaction;
}
else if (nb > ms->dvsize) {
if (smallbits != 0) { /* Use chunk in next nonempty smallbin */
mchunkptr b, p, r;
size_t rsize;
bindex_t i;
binmap_t leftbits = (smallbits << idx) & left_bits(idx2bit(idx));
binmap_t leastbit = least_bit(leftbits);
compute_bit2idx(leastbit, i);
b = smallbin_at(ms, i);
p = b->fd;
assert(chunksize(p) == small_index2size(i));
unlink_first_small_chunk(ms, b, p, i);
rsize = small_index2size(i) - nb;
/* Fit here cannot be remainderless if 4byte sizes */
if (SIZE_T_SIZE != 4 && rsize < MIN_CHUNK_SIZE)
set_inuse_and_pinuse(ms, p, small_index2size(i));
else {
set_size_and_pinuse_of_inuse_chunk(ms, p, nb);
r = chunk_plus_offset(p, nb);
set_size_and_pinuse_of_free_chunk(r, rsize);
replace_dv(ms, r, rsize);
}
mem = chunk2mem(p);
check_malloced_chunk(ms, mem, nb);
goto postaction;
}
else if (ms->treemap != 0 && (mem = tmalloc_small(ms, nb)) != 0) {
check_malloced_chunk(ms, mem, nb);
goto postaction;
}
}
}