Giacomo Tesio
c7d0f621c9
I'm very grateful to Charles Forsyth for creating most of Jehanne's kernel and to 9front's guys for all the code and ideas they freely share. Here I make their copyrights explicit as they had been erroneusly omitted or messed up before. Sorry.
110 lines
1.7 KiB
C
110 lines
1.7 KiB
C
/* Copyright (C) Charles Forsyth
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* See /doc/license/NOTICE.Plan9-9k.txt for details about the licensing.
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*/
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/* Portions of this file are Copyright (C) 2015-2018 Giacomo Tesio <giacomo@tesio.it>
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* See /doc/license/gpl-2.0.txt for details about the licensing.
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*/
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#include "u.h"
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#include "../port/lib.h"
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#include "mem.h"
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#include "dat.h"
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#include "fns.h"
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static Alarms alarms;
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static Rendez alarmr;
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void
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alarmkproc(void* _1)
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{
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Proc *rp;
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uint64_t now;
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for(;;){
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now = sys->ticks;
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qlock(&alarms.ql);
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while((rp = alarms.head) && tickscmp(now, rp->alarm) >= 0){
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if(rp->alarm != 0L){
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if(canqlock(&rp->debug)){
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if(!waserror()){
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postnote(rp, 0, "alarm", NUser);
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poperror();
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}
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qunlock(&rp->debug);
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rp->alarm = 0L;
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}else
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break;
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}
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alarms.head = rp->palarm;
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}
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qunlock(&alarms.ql);
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sleep(&alarmr, return0, 0);
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}
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}
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/*
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* called every clock tick
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*/
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void
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checkalarms(void)
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{
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Proc *p;
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uint64_t now;
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p = alarms.head;
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now = sys->ticks;
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if(p != nil && tickscmp(now, p->alarm) >= 0)
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wakeup(&alarmr);
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}
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uint64_t
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procalarm(uint64_t time)
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{
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Proc **l, *f;
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uint64_t when, old;
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if(up->alarm)
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old = tk2ms(up->alarm - sys->ticks);
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else
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old = 0;
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if(time == 0) {
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up->alarm = 0;
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return old;
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}
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when = ms2tk(time)+sys->ticks;
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if(when == 0)
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when = 1;
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qlock(&alarms.ql);
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l = &alarms.head;
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for(f = *l; f; f = f->palarm) {
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if(up == f){
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*l = f->palarm;
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break;
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}
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l = &f->palarm;
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}
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up->palarm = 0;
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if(alarms.head) {
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l = &alarms.head;
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for(f = *l; f; f = f->palarm) {
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if(tickscmp(f->alarm, when) >= 0) {
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up->palarm = f;
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*l = up;
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goto done;
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}
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l = &f->palarm;
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}
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*l = up;
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}
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else
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alarms.head = up;
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done:
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up->alarm = when;
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qunlock(&alarms.ql);
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return old;
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}
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