char *
edfadmit(Proc *p)
{
Proc *up = externup();
char *err;
Edf *e;
int i;
Proc *r;
int32_t tns;
e = p->edf;
if (e->flags & Admitted)
return "task state"; /* should never happen */
/* simple sanity checks */
if (e->T == 0)
return "T not set";
if (e->C == 0)
return "C not set";
if (e->D > e->T)
return "D > T";
if (e->D == 0) /* if D is not set, set it to T */
e->D = e->T;
if (e->C > e->D)
return "C > D";
qlock(&edfschedlock);
if (err = testschedulability(p)){
qunlock(&edfschedlock);
return err;
}
e->flags |= Admitted;
edflock(p);
if(p->trace)
proctrace(p, SAdmit, 0);
/* Look for another proc with the same period to synchronize to */
for(i=0; (r = psincref(i)) != nil; i++) {
if(r->state == Dead || r == p){
psdecref(r);
continue;
}
if (r->edf == nil || (r->edf->flags & Admitted) == 0){
psdecref(r);
continue;
}
if (r->edf->T == e->T)
break;
}
if (r == nil){
/* Can't synchronize to another proc, release now */
e->t = now;
e->d = 0;
release(p);
if (p == up){
DPRINT("%lu edfadmit self %d[%s], release now: r=%lu d=%lu t=%lu\n",
now, p->pid, statename[p->state], e->r, e->d, e->t);
/* We're already running */
edfrun(p, 1);
}else{
/* We're releasing another proc */
DPRINT("%lu edfadmit other %d[%s], release now: r=%lu d=%lu t=%lu\n",
now, p->pid, statename[p->state], e->r, e->d, e->t);
p->Timer.ta = p;
edfunlock();
qunlock(&edfschedlock);
releaseintr(nil, &p->Timer);
return nil;
}
}else{
/* Release in synch to something else */
e->t = r->edf->t;
psdecref(r);
if (p == up){
DPRINT("%lu edfadmit self %d[%s], release at %lu\n",
now, p->pid, statename[p->state], e->t);
}else{
DPRINT("%lu edfadmit other %d[%s], release at %lu\n",
now, p->pid, statename[p->state], e->t);
if(e->Timer.tt == nil){
e->Timer.tf = releaseintr;
e->Timer.ta = p;
tns = e->t - now;
if(tns < 20)
tns = 20;
e->Timer.tns = 1000LL * tns;
e->Timer.tmode = Trelative;
timeradd(&e->Timer);
}
}
}
edfunlock();
qunlock(&edfschedlock);
return nil;
}
char *
edfadmit(Proc *p)
{
char *err;
Edf *e;
int i;
Proc *r;
void (*pt)(Proc*, int, vlong);
e = p->edf;
if (e->flags & Admitted)
return "task state"; /* should never happen */
/* simple sanity checks */
if (e->T == 0)
return "T not set";
if (e->C == 0)
return "C not set";
if (e->D > e->T)
return "D > T";
if (e->D == 0) /* if D is not set, set it to T */
e->D = e->T;
if (e->C > e->D)
return "C > D";
qlock(&edfschedlock);
if (err = testschedulability(p)){
qunlock(&edfschedlock);
return err;
}
e->flags |= Admitted;
edflock(p);
if(pt = proctrace)
pt(p, SAdmit, now);
/* Look for another proc with the same period to synchronize to */
SET(r);
for(i=0; i<conf.nproc; i++) {
r = proctab(i);
if(r->state == Dead || r == p)
continue;
if (r->edf == nil || (r->edf->flags & Admitted) == 0)
continue;
if (r->edf->T == e->T)
break;
}
if (i == conf.nproc){
/* Can't synchronize to another proc, release now */
e->t = now;
e->d = 0;
release(p);
if (p == up){
DPRINT("%t edfadmit self %lud[%s], release now: r=%t d=%t t=%t\n",
now, p->pid, statename[p->state], e->r, e->d, e->t);
/* We're already running */
edfrun(p, 1);
}else{
/* We're releasing another proc */
DPRINT("%t edfadmit other %lud[%s], release now: r=%t d=%t t=%t\n",
now, p->pid, statename[p->state], e->r, e->d, e->t);
p->ta = p;
edfunlock();
qunlock(&edfschedlock);
releaseintr(nil, p);
return nil;
}
}else{
/* Release in synch to something else */
e->t = r->edf->t;
if (p == up){
DPRINT("%t edfadmit self %lud[%s], release at %t\n",
now, p->pid, statename[p->state], e->t);
edfunlock();
qunlock(&edfschedlock);
return nil;
}else{
DPRINT("%t edfadmit other %lud[%s], release at %t\n",
now, p->pid, statename[p->state], e->t);
if(e->tt == nil){
e->tf = releaseintr;
e->ta = p;
e->tns = e->t;
e->tmode = Tabsolute;
timeradd(e);
}
}
}
edfunlock();
qunlock(&edfschedlock);
return nil;
}