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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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8
libc/calls/nanosleep-xnu.c
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@ -29,7 +29,7 @@ int sys_nanosleep_xnu(const struct timespec *req, struct timespec *rem) {
int rc;
struct timeval wt, t1, t2, td;
if (rem) sys_gettimeofday_xnu(&t1, 0, 0);
wt = _timespec_totimeval(*req); // rounds up
wt = timespec_totimeval(*req); // rounds up
rc = sys_select(0, 0, 0, 0, &wt);
if (rem) {
if (!rc) {
@ -39,12 +39,12 @@ int sys_nanosleep_xnu(const struct timespec *req, struct timespec *rem) {
// xnu select() doesn't modify timeout
// so we need, yet another system call
sys_gettimeofday_xnu(&t2, 0, 0);
td = _timeval_sub(t2, t1);
if (_timeval_gte(td, wt)) {
td = timeval_sub(t2, t1);
if (timeval_cmp(td, wt) >= 0) {
rem->tv_sec = 0;
rem->tv_nsec = 0;
} else {
*rem = _timeval_totimespec(_timeval_sub(wt, td));
*rem = timeval_totimespec(timeval_sub(wt, td));
}
}
}