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Kernel: Use TimerQueue for SIGALRM

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Tom 2020-12-01 15:44:52 -07:00 • committed by Andreas Kling
parent 601a688b6f
commit 4c1e27ec65
6 changed files with 43 additions and 27 deletions
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24
Kernel/Syscalls/alarm.cpp
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@ -33,15 +33,25 @@ unsigned Process::sys$alarm(unsigned seconds)
{
REQUIRE_PROMISE(stdio);
unsigned previous_alarm_remaining = 0;
auto uptime = TimeManagement::the().uptime_ms();
if (m_alarm_deadline && m_alarm_deadline > uptime) {
previous_alarm_remaining = m_alarm_deadline - uptime;
if (auto alarm_timer = move(m_alarm_timer)) {
if (TimerQueue::the().cancel_timer(*alarm_timer)) {
// The timer hasn't fired. Round up the remaining time (if any)
timespec remaining;
timespec_add(alarm_timer->remaining(), { 0, 1000000000 - 1 }, remaining);
previous_alarm_remaining = remaining.tv_sec;
}
// We had an existing alarm, must return a non-zero value here!
if (previous_alarm_remaining == 0)
previous_alarm_remaining = 1;
}
if (!seconds) {
m_alarm_deadline = 0;
return previous_alarm_remaining;
if (seconds > 0) {
auto deadline = TimeManagement::the().monotonic_time(); // TODO: should be using CLOCK_REALTIME
timespec_add(deadline, { seconds, 0 }, deadline);
m_alarm_timer = TimerQueue::the().add_timer_without_id(deadline, [this]() {
(void)send_signal(SIGALRM, nullptr);
});
}
m_alarm_deadline = uptime + seconds * 1000;
return previous_alarm_remaining;
}