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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
Notes: sideshowbarker 2024-07-19 14:57:04 +09:00
5 changed files with 34 additions and 21 deletions
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11
Kernel/Process.cpp
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@ -915,9 +915,10 @@ int Process::sys$utime(const char* pathname, const utimbuf* buf)
atime = buf->actime;
mtime = buf->modtime;
} else {
auto now = RTC::now();
mtime = now;
atime = now;
struct timeval now;
kgettimeofday(now);
mtime = now.tv_sec;
atime = now.tv_sec;
}
return VFS::the().utime(String(pathname), cwd_inode(), atime, mtime);
}
@ -1238,8 +1239,8 @@ int Process::sys$sleep(unsigned seconds)
void kgettimeofday(timeval& tv)
{
tv.tv_sec = RTC::now();
tv.tv_usec = (PIT::ticks_since_boot() % 1000) * 1000;
tv.tv_sec = RTC::boot_time() + PIT::seconds_since_boot();
tv.tv_usec = PIT::ticks_this_second() * 1000;
}
int Process::sys$gettimeofday(timeval* tv)