o5r/plan9port
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

various tweaks.

Browse source
This commit is contained in:
rsc 2003-12-06 18:05:27 +00:00
parent c715a6127a
commit e97ceade5e
10 changed files with 74 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

33
src/libthread/sched.c
View file

@ -93,12 +93,21 @@ runthread(Proc *p)
Thread *t;
Tqueue *q;
if(p->nthreads==0)
if(p->nthreads==0 || (p->nthreads==1 && p->idle))
return nil;
q = &p->ready;
lock(&p->readylock);
if(q->head == nil){
q->asleep = 1;
if(p->idle){
if(p->idle->state != Ready){
fprint(2, "everyone is asleep\n");
exits("everyone is asleep");
}
unlock(&p->readylock);
return p->idle;
}
_threaddebug(DBGSCHED, "sleeping for more work (%d threads)", p->nthreads);
unlock(&p->readylock);
while(rendezvous((ulong)q, 0) == ~0){
@ -167,6 +176,9 @@ _threadready(Thread *t)
{
Tqueue *q;
if(t == t->proc->idle)
return;
assert(t->state == Ready);
_threaddebug(DBGSCHED, "readying %d.%d", t->proc->pid, t->id);
q = &t->proc->ready;
@ -190,6 +202,25 @@ _threadready(Thread *t)
unlock(&t->proc->readylock);
}
void
_threadidle(void)
{
Tqueue *q;
Thread *t;
Proc *p;
p = _threadgetproc();
q = &p->ready;
lock(&p->readylock);
assert(q->head);
t = q->head;
q->head = t->next;
if(q->tail == t)
q->tail = nil;
p->idle = t;
unlock(&p->readylock);
}
void
yield(void)
{