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Rewrite to remove dependence on rendezvous and its bizarre

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data structures.  Makes it easier to use pthreads too.
Still need to add code for non-pthreads systems.

Just a checkpoint to switch work to another machine.
This commit is contained in:
rsc 2004-09-17 00:38:29 +00:00
parent 984e353160
commit 06bb4ed20d
15 changed files with 205 additions and 218 deletions
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11
src/libthread/sched.c
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@ -36,6 +36,7 @@ _schedinit(void *arg)
unlock(&p->lock);
while(_setlabel(&p->sched))
;
malloc(10);
_threaddebug(DBGSCHED, "top of schedinit, _threadexitsallstatus=%p", _threadexitsallstatus);
if(_threadexitsallstatus)
_exits(_threadexitsallstatus);
@ -57,8 +58,9 @@ _schedinit(void *arg)
p->threads.tail = t->prevt;
unlock(&p->lock);
if(t->inrendez){
_threadflagrendez(t);
_threadbreakrendez();
abort();
// _threadflagrendez(t);
// _threadbreakrendez();
}
_stackfree(t->stk);
free(t->cmdname);
@ -183,15 +185,18 @@ _sched(void)
Resched:
p = _threadgetproc();
//fprint(2, "p %p\n", p);
malloc(10);
if((t = p->thread) != nil){
needstack(512);
// _threaddebug(DBGSCHED, "pausing, state=%s set %p goto %p",
// psstate(t->state), &t->sched, &p->sched);
print("swap\n");
if(_setlabel(&t->sched)==0)
_gotolabel(&p->sched);
_threadstacklimit(t->stk, t->stk+t->stksize);
return p->nsched++;
}else{
malloc(10);
t = runthread(p);
if(t == nil){
_threaddebug(DBGSCHED, "all threads gone; exiting");
@ -206,6 +211,8 @@ Resched:
}
t->state = Running;
t->nextstate = Ready;
malloc(10);
print("gotolabel\n");
_gotolabel(&t->sched);
for(;;);
}