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Make more improvements to threads and mappings

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- NetBSD should now have faster synchronization
- POSIX barriers may now be shared across processes
- An edge case with memory map tracking has been fixed
- Grand Central Dispatch is no longer used on MacOS ARM64
- POSIX mutexes in normal mode now use futexes across processes
This commit is contained in:
Justine Tunney 2024-07-24 01:05:00 -07:00
parent 2187d6d2dd
commit e398f3887c
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GPG key ID: BE714B4575D6E328
20 changed files with 566 additions and 171 deletions
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13
libc/intrin/mprotect.c
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@ -75,6 +75,7 @@ int __mprotect(char *addr, size_t size, int prot) {
return edeadlk();
}
struct Map *map, *floor;
StartOver:
floor = __maps_floor(addr);
for (map = floor; map && map->addr <= addr + size; map = __maps_next(map)) {
char *map_addr = map->addr;
@ -93,10 +94,12 @@ int __mprotect(char *addr, size_t size, int prot) {
}
} else if (addr <= map_addr) {
// change lefthand side of mapping
size_t left = PGUP(addr + size - map_addr);
size_t left = addr + size - map_addr;
size_t right = map_size - left;
struct Map *leftmap;
if ((leftmap = __maps_alloc())) {
if (leftmap == MAPS_RETRY)
goto StartOver;
if (!__mprotect_chunk(map_addr, left, prot, false)) {
leftmap->addr = map_addr;
leftmap->size = left;
@ -127,6 +130,8 @@ int __mprotect(char *addr, size_t size, int prot) {
size_t right = map_addr + map_size - addr;
struct Map *leftmap;
if ((leftmap = __maps_alloc())) {
if (leftmap == MAPS_RETRY)
goto StartOver;
if (!__mprotect_chunk(map_addr + left, right, prot, false)) {
leftmap->addr = map_addr;
leftmap->size = left;
@ -159,8 +164,14 @@ int __mprotect(char *addr, size_t size, int prot) {
size_t right = map_size - middle - left;
struct Map *leftmap;
if ((leftmap = __maps_alloc())) {
if (leftmap == MAPS_RETRY)
goto StartOver;
struct Map *midlmap;
if ((midlmap = __maps_alloc())) {
if (midlmap == MAPS_RETRY) {
__maps_free(leftmap);
goto StartOver;
}
if (!__mprotect_chunk(map_addr + left, middle, prot, false)) {
leftmap->addr = map_addr;
leftmap->size = left;