2002/0405/pc/cycintr.c (diff list | history)

pc/cycintr.c on 2000/0623
2000/0623		#include "u.h" #include "../port/lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #include "io.h" static struct { Lock;
2002/0405		Timer *ci; }timers;
2000/0623
2000/0627		/* * called by clockintrsched() */ vlong
2002/0405		timernext(void)
2000/0623		{
2002/0405		Timer *ci;
2000/0627		vlong when;
2002/0405		ilock(&timers);
2000/0627		when = 0;
2002/0405		ci = timers.ci;
2000/0627		if(ci != nil) when = ci->when;
2002/0405		iunlock(&timers);
2000/0627		return when;
2000/0623		}
2000/0627		vlong
2002/0405		checktimer(Ureg *u, void*)
2000/0623		{
2002/0405		Timer *ci;
2000/0627		vlong when;
2000/0623
2002/0405		ilock(&timers); while(ci = timers.ci){
2000/0627		when = ci->when; if(when > fastticks(nil)){
2002/0405		iunlock(&timers);
2000/0627		return when; }
2002/0405		timers.ci = ci->next; iunlock(&timers);
2000/0623		(*ci->f)(u, ci);
2002/0405		ilock(&timers);
2000/0623		}
2002/0405		iunlock(&timers);
2000/0627		return 0;
2000/0623		} void
2002/0405		timeradd(Timer *nci)
2000/0623		{
2002/0405		Timer *ci, **last;
2000/0623
2002/0405		ilock(&timers); last = &timers.ci;
2000/0623		while(ci = *last){ if(ci == nci){ *last = ci->next; break; } last = &ci->next; }
2002/0405		last = &timers.ci;
2000/0623		while(ci = *last){ if(ci->when > nci->when) break; last = &ci->next; } nci->next = *last; *last = nci;
2002/0405		iunlock(&timers);
2000/0623		} void
2002/0405		timerdel(Timer *dci)
2000/0623		{
2002/0405		Timer *ci, **last;
2000/0623
2002/0405		ilock(&timers); last = &timers.ci;
2000/0623		while(ci = *last){ if(ci == dci){ *last = ci->next; break; } last = &ci->next; }
2002/0405		iunlock(&timers);
2000/0623		}