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Kernel: Do timekeeping manually instead of asking the RTC all the time.

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This introduces a tiny amount of timer drift which I will have to fix
somehow eventually, but it's a huge improvement in timing consistency
as we no longer suddenly jump from e.g 10:45:49.123 to 10:45:50.000.
This commit is contained in:
Andreas Kling 2019-03-25 02:06:57 +01:00
parent 20f7d7ec67
commit ab11f42094
5 changed files with 34 additions and 21 deletions
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8
Kernel/Scheduler.cpp
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@ -55,15 +55,15 @@ bool Scheduler::pick_next()
return context_switch(s_colonel_process->main_thread());
}
auto now_sec = RTC::now();
auto now_usec = (suseconds_t)((PIT::ticks_since_boot() % 1000) * 1000);
struct timeval now;
kgettimeofday(now);
auto now_sec = now.tv_sec;
auto now_usec = now.tv_usec;
// Check and unblock threads whose wait conditions have been met.
Thread::for_each([&] (Thread& thread) {
auto& process = thread.process();
// dbgprintf("pick_next, checking on %s(%u:%u) in state %s\n", process.name().impl()->characters(), process.pid(), thread.tid(), to_string(thread.state()));
if (thread.state() == Thread::BlockedSleep) {
if (thread.wakeup_time() <= system.uptime)
thread.unblock();