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Fix mmap MT bug on Windows

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Justine Tunney 2024-10-31 23:06:06 -07:00
parent 9add248c9b
commit 913b573661
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GPG key ID: BE714B4575D6E328
2 changed files with 9 additions and 11 deletions
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17
libc/intrin/mmap.c
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@ -411,22 +411,21 @@ void *__maps_randaddr(void) {
return (void *)addr;
}
void *__maps_pickaddr(size_t size) {
static void *__maps_pickaddr(size_t size) {
char *addr;
__maps_lock();
for (int try = 0; try < MAX_TRIES; ++try) {
addr = atomic_exchange_explicit(&__maps.pick, 0, memory_order_acq_rel);
addr = __maps.pick;
__maps.pick = 0;
if (!addr)
addr = __maps_randaddr();
__maps_lock();
bool overlaps = __maps_overlaps(addr, size, __pagesize);
__maps_unlock();
if (!overlaps) {
atomic_store_explicit(&__maps.pick,
addr + ((size + __gransize - 1) & __gransize),
memory_order_release);
if (!__maps_overlaps(addr, size, __pagesize)) {
__maps.pick = addr + ((size + __gransize - 1) & __gransize);
__maps_unlock();
return addr;
}
}
__maps_unlock();
return 0;
}