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implement Alarms;
include "sys.m";
sys: Sys;
include "alarms.m";
Alarm.stop(a: self Alarm)
{
a.alchan <-= -1;
fd:=sys->open("#p/"+string a.pid+"/ctl",sys->OWRITE);
sys->fprint(fd, "killgrp");
}
Alarm.alarm(time: int): Alarm
{
if (sys == nil)
sys = load Sys Sys->PATH;
pid := sys->pctl(sys->NEWPGRP|sys->FORKNS,nil);
a:=Alarm(chan of int,pid);
spawn listener(a.alchan);
spawn sleeper(a.alchan,time,pid);
return a;
}
sleeper(ch: chan of int, time, pid: int)
{
sys->sleep(time);
alt{
ch <-= pid =>
;
* =>
exit;
}
}
listener(ch: chan of int)
{
a := <-ch;
if (a==-1)
exit;
fd := sys->open("#p/"+string a+"/ctl",sys->OWRITE);
if (fd != nil)
sys->fprint(fd, "killgrp");
}
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