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Kernel: Add CLOCK_REALTIME support to the TimerQueue

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This allows us to use blocking timeouts with either monotonic or
real time for all blockers. Which means that clock_nanosleep()
now also supports CLOCK_REALTIME.

Also, switch alarm() to use CLOCK_REALTIME as per specification.
This commit is contained in:
Tom 2020-12-01 16:53:47 -07:00 • committed by Andreas Kling
parent 4c1e27ec65
commit 12cf6f8650
9 changed files with 182 additions and 97 deletions
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24
Kernel/Syscalls/clock.cpp
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@ -34,20 +34,11 @@ int Process::sys$clock_gettime(clockid_t clock_id, Userspace<timespec*> user_ts)
{
REQUIRE_PROMISE(stdio);
timespec ts = {};
auto ts = TimeManagement::the().current_time(clock_id);
if (ts.is_error())
return ts.error();
switch (clock_id) {
case CLOCK_MONOTONIC:
ts = TimeManagement::the().monotonic_time();
break;
case CLOCK_REALTIME:
ts = TimeManagement::the().epoch_time();
break;
default:
return -EINVAL;
}
if (!copy_to_user(user_ts, &ts))
if (!copy_to_user(user_ts, &ts.value()))
return -EFAULT;
return 0;
}
@ -88,13 +79,14 @@ int Process::sys$clock_nanosleep(Userspace<const Syscall::SC_clock_nanosleep_par
bool is_absolute = params.flags & TIMER_ABSTIME;
switch (params.clock_id) {
case CLOCK_MONOTONIC: {
case CLOCK_MONOTONIC:
case CLOCK_REALTIME: {
bool was_interrupted;
if (is_absolute) {
was_interrupted = Thread::current()->sleep_until(requested_sleep).was_interrupted();
was_interrupted = Thread::current()->sleep_until(params.clock_id, requested_sleep).was_interrupted();
} else {
timespec remaining_sleep;
was_interrupted = Thread::current()->sleep(requested_sleep, &remaining_sleep).was_interrupted();
was_interrupted = Thread::current()->sleep(params.clock_id, requested_sleep, &remaining_sleep).was_interrupted();
if (was_interrupted && params.remaining_sleep && !copy_to_user(params.remaining_sleep, &remaining_sleep))
return -EFAULT;
}