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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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17
third_party/nsync/mem/nsync_cv.c vendored
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@ -15,6 +15,7 @@
│ See the License for the specific language governing permissions and │
│ limitations under the License. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/cp.internal.h"
#include "libc/str/str.h"
#include "libc/thread/thread.h"
#include "third_party/nsync/atomic.internal.h"
@ -202,6 +203,7 @@ int nsync_cv_wait_with_deadline_generic (nsync_cv *pcv, void *pmu,
int outcome = 0;
waiter *w;
IGNORE_RACES_START ();
BEGIN_CANCELLATION_POINT;
w = nsync_waiter_new_ ();
pthread_cleanup_push((void *)nsync_waiter_free_, w);
ATM_STORE (&w->nw.waiting, 1);
@ -315,6 +317,7 @@ int nsync_cv_wait_with_deadline_generic (nsync_cv *pcv, void *pmu,
}
}
pthread_cleanup_pop(0);
END_CANCELLATION_POINT;
IGNORE_RACES_END ();
return (outcome);
}
@ -444,9 +447,9 @@ void nsync_cv_broadcast (nsync_cv *pcv) {
}
/* Wait with deadline, using an nsync_mu. */
int nsync_cv_wait_with_deadline (nsync_cv *pcv, nsync_mu *pmu,
nsync_time abs_deadline,
nsync_note cancel_note) {
errno_t nsync_cv_wait_with_deadline (nsync_cv *pcv, nsync_mu *pmu,
nsync_time abs_deadline,
nsync_note cancel_note) {
return (nsync_cv_wait_with_deadline_generic (pcv, pmu, &void_mu_lock,
&void_mu_unlock,
abs_deadline, cancel_note));
@ -457,9 +460,11 @@ int nsync_cv_wait_with_deadline (nsync_cv *pcv, nsync_mu *pmu,
wakeup. Then reacquires *pmu, and return. The call is equivalent to a call
to nsync_cv_wait_with_deadline() with abs_deadline==nsync_time_no_deadline, and a NULL
cancel_note. It should be used in a loop, as with all standard Mesa-style
condition variables. See examples above. */
void nsync_cv_wait (nsync_cv *pcv, nsync_mu *pmu) {
nsync_cv_wait_with_deadline (pcv, pmu, nsync_time_no_deadline, NULL);
condition variables. See examples above. Returns 0 normally, otherwise
ECANCELED may be returned if calling POSIX thread is cancelled only when
the PTHREAD_CANCEL_MASKED mode is in play. */
errno_t nsync_cv_wait (nsync_cv *pcv, nsync_mu *pmu) {
return nsync_cv_wait_with_deadline (pcv, pmu, nsync_time_no_deadline, NULL);
}
static nsync_time cv_ready_time (void *v, struct nsync_waiter_s *nw) {