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Kernel: Make clock_nanosleep aware of dynamic tick length

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On my system, ticks_per_second() returns 1280.
So Serenity was very fast at sleeping! :P
This commit is contained in:
Ben Wiederhake 2020-05-11 03:05:22 +02:00 • committed by Andreas Kling
parent 4a5a7b68eb
commit 76c135ddcf
1 changed files with 4 additions and 3 deletions
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7
Kernel/Process.cpp
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@ -4610,13 +4610,14 @@ int Process::sys$clock_nanosleep(const Syscall::SC_clock_nanosleep_params* user_
u64 time_to_wake = (requested_sleep.tv_sec * 1000 + requested_sleep.tv_nsec / 1000000);
wakeup_time = Thread::current()->sleep_until(time_to_wake);
} else {
u32 ticks_to_sleep = (requested_sleep.tv_sec * 1000 + requested_sleep.tv_nsec / 1000000);
u64 ticks_to_sleep = requested_sleep.tv_sec * TimeManagement::the().ticks_per_second();
ticks_to_sleep += requested_sleep.tv_nsec * TimeManagement::the().ticks_per_second() / 1000000000;
if (!ticks_to_sleep)
return 0;
wakeup_time = Thread::current()->sleep(ticks_to_sleep);
}
if (wakeup_time > g_uptime) {
u32 ticks_left = wakeup_time - g_uptime;
u64 ticks_left = wakeup_time - g_uptime;
if (!is_absolute && params.remaining_sleep) {
if (!validate_write_typed(params.remaining_sleep)) {
// This can happen because the lock is dropped while
@ -4629,7 +4630,7 @@ int Process::sys$clock_nanosleep(const Syscall::SC_clock_nanosleep_params* user_
memset(&remaining_sleep, 0, sizeof(timespec));
remaining_sleep.tv_sec = ticks_left / TimeManagement::the().ticks_per_second();
ticks_left -= remaining_sleep.tv_sec * TimeManagement::the().ticks_per_second();
remaining_sleep.tv_nsec = ticks_left * 1000000;
remaining_sleep.tv_nsec = ticks_left * 1000000000 / TimeManagement::the().ticks_per_second();
copy_to_user(params.remaining_sleep, &remaining_sleep);
}
return -EINTR;