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Improve Windows sleep accuracy from 15ms to 15µs

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Justine Tunney 2024-12-06 23:00:07 -08:00
parent b40140e6c5
commit b490e23d63
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GPG key ID: BE714B4575D6E328
16 changed files with 189 additions and 67 deletions
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13
libc/calls/poll-nt.c
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@ -318,8 +318,8 @@ textwindows static int sys_poll_nt_actual(struct pollfd *fds, uint64_t nfds,
textwindows static int sys_poll_nt_impl(struct pollfd *fds, uint64_t nfds,
struct timespec deadline,
const sigset_t waitmask) {
uint32_t waitms;
int i, n, rc, got = 0;
struct timespec now, next, target;
// we normally don't check for signals until we decide to wait, since
// it's nice to have functions like write() be unlikely to EINTR, but
@ -344,9 +344,16 @@ textwindows static int sys_poll_nt_impl(struct pollfd *fds, uint64_t nfds,
}
if (got)
return got;
if (!(waitms = sys_poll_nt_waitms(deadline)))
now = sys_clock_gettime_monotonic_nt();
if (timespec_cmp(now, deadline) >= 0)
return 0;
if (_park_norestart(waitms, waitmask) == -1)
next = timespec_add(now, timespec_frommillis(POLL_INTERVAL_MS));
if (timespec_cmp(next, deadline) >= 0) {
target = deadline;
} else {
target = next;
}
if (_park_norestart(target, waitmask) == -1)
return -1;
}
}