static int
canflush(Proc *p, Segment *s)
{
int i;
Proc *ep;
lock(&s->ref.lk);
if(s->ref.ref == 1) { /* Easy if we are the only user */
s->ref.ref++;
unlock(&s->ref.lk);
return canpage(p);
}
s->ref.ref++;
unlock(&s->ref.lk);
/* Now we must do hardwork to ensure all processes which have tlb
* entries for this segment will be flushed if we succeed in paging it out
*/
p = proctab(0);
ep = &p[conf.nproc];
while(p < ep) {
if(p->state != Dead) {
for(i = 0; i < NSEG; i++)
if(p->seg[i] == s)
if(!canpage(p))
return 0;
}
p++;
}
return 1;
}
static int
canflush(Proc *p, Segment *s)
{
int i, x;
lock(s);
if(s->ref == 1) { /* Easy if we are the only user */
s->ref++;
unlock(s);
return canpage(p);
}
s->ref++;
unlock(s);
/* Now we must do hardwork to ensure all processes which have tlb
* entries for this segment will be flushed if we succeed in paging it out
*/
for(x = 0; (p = psincref(x)) != nil; x++){
if(p->state != Dead) {
for(i = 0; i < NSEG; i++){
if(p->seg[i] == s && !canpage(p)){
psdecref(p);
return 0;
}
}
}
psdecref(p);
}
return 1;
}
