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Make improvements

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- Clean up sigaction() code
- Add a port scanner example
- Introduce a ParseCidr() API
- Clean up our futex abstraction code
- Fix a harmless integer overflow in ParseIp()
- Use kernel semaphores on NetBSD to make threads much faster
This commit is contained in:
Justine Tunney 2022-11-07 02:22:09 -08:00
parent 539bddce8c
commit c995838e5c
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GPG key ID: BE714B4575D6E328
107 changed files with 1085 additions and 492 deletions
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6
libc/thread/sem_open.c
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@ -209,7 +209,7 @@ sem_t *sem_open(const char *name, int oflag, ...) {
sem = SEM_FAILED;
} else if (~oflag & O_EXCL) {
sem = s->sem;
atomic_fetch_add_explicit(&sem->sem_prefs, 1, memory_order_acquire);
atomic_fetch_add_explicit(&sem->sem_prefs, 1, memory_order_acq_rel);
++s->refs;
} else {
eexist();
@ -218,7 +218,7 @@ sem_t *sem_open(const char *name, int oflag, ...) {
} else if ((s = calloc(1, sizeof(struct Semaphore)))) {
if ((s->path = strdup(path))) {
if ((sem = sem_open_impl(path, oflag, mode, value)) != SEM_FAILED) {
atomic_fetch_add_explicit(&sem->sem_prefs, 1, memory_order_relaxed);
atomic_fetch_add_explicit(&sem->sem_prefs, 1, memory_order_acq_rel);
s->next = g_semaphores.list;
s->sem = sem;
s->refs = 1;
@ -260,7 +260,7 @@ int sem_close(sem_t *sem) {
sem_open_init();
sem_open_lock();
_npassert((s = sem_open_get(sem, &p)));
prefs = atomic_fetch_add_explicit(&sem->sem_prefs, -1, memory_order_release);
prefs = atomic_fetch_add_explicit(&sem->sem_prefs, -1, memory_order_acq_rel);
_npassert(s->refs > 0);
if ((unmap = !--s->refs)) {
_npassert(prefs > 0);