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kernel: make sure procalarm() remaining time doesnt become negative

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cinap_lenrek 2016-09-08 01:28:34 +02:00
parent 01b4c2a63d
commit 5d9deb77e9
1 changed files with 9 additions and 3 deletions
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12
sys/src/9/port/alarm.c
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@ -63,14 +63,20 @@ procalarm(ulong time)
Proc **l, *f;
ulong when, old;
when = MACHP(0)->ticks;
old = up->alarm;
if(old)
old = tk2ms(old - MACHP(0)->ticks);
if(old) {
old -= when;
if((long)old > 0)
old = tk2ms(old);
else
old = 0;
}
if(time == 0) {
up->alarm = 0;
return old;
}
when = ms2tk(time)+MACHP(0)->ticks;
when += ms2tk(time);
if(when == 0)
when = 1;