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Improve cancellations, randomness, and time

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- Exhaustively document cancellation points
- Rename SIGCANCEL to SIGTHR just like BSDs
- Further improve POSIX thread cancellations
- Ensure asynchronous cancellations work correctly
- Elevate the quality of getrandom() and getentropy()
- Make futexes cancel correctly on OpenBSD 6.x and 7.x
- Add reboot.com and shutdown.com to examples directory
- Remove underscore prefix from awesome timespec_*() APIs
- Create assertions that help verify our cancellation points
- Remove bad timespec APIs (cmp generalizes eq/ne/gt/gte/lt/lte)
This commit is contained in:
Justine Tunney 2022-11-05 19:49:41 -07:00
parent 0d7c265392
commit 3f0bcdc3ef
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GPG key ID: BE714B4575D6E328
173 changed files with 1599 additions and 782 deletions
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11
libc/thread/sem_timedwait.c
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@ -17,6 +17,7 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/calls/cp.internal.h"
#include "libc/calls/struct/timespec.h"
#include "libc/calls/struct/timespec.internal.h"
#include "libc/errno.h"
@ -42,11 +43,11 @@ static struct timespec *sem_timeout(struct timespec *memory,
*memory = *abstime;
return memory;
} else {
now = _timespec_real();
if (_timespec_cmp(now, *abstime) > 0) {
now = timespec_real();
if (timespec_cmp(now, *abstime) > 0) {
*memory = (struct timespec){0};
} else {
*memory = _timespec_sub(*abstime, now);
*memory = timespec_sub(*abstime, now);
}
return memory;
}
@ -87,6 +88,7 @@ int sem_timedwait(sem_t *sem, const struct timespec *abstime) {
}
}
BEGIN_CANCELLATION_POINT;
_unassert(atomic_fetch_add_explicit(&sem->sem_waiters, +1,
memory_order_acq_rel) >= 0);
pthread_cleanup_push(sem_timedwait_cleanup, sem);
@ -102,7 +104,7 @@ int sem_timedwait(sem_t *sem, const struct timespec *abstime) {
rc = 0;
} else if (rc == -ETIMEDOUT) {
_npassert(abstime);
if (_timespec_cmp(*abstime, _timespec_real()) <= 0) {
if (timespec_cmp(*abstime, timespec_real()) <= 0) {
rc = etimedout();
} else {
rc = 0;
@ -122,6 +124,7 @@ int sem_timedwait(sem_t *sem, const struct timespec *abstime) {
memory_order_relaxed)));
pthread_cleanup_pop(1);
END_CANCELLATION_POINT;
return rc;
}