Continue switching library over to pthreads when possible.

Tprimes works on Linux 2.6.  You can only have 128 procs
though.

src/libthread/channel.c

@@ -29,7 +29,7 @@ canexec(Alt *a)
 	/* are there senders or receivers blocked? */
 	otherop = (CHANSND+CHANRCV) - a->op;
 	for(i=0; i<c->nentry; i++)
-		if(c->qentry[i] && c->qentry[i]->op==otherop && c->qentry[i]->thread==nil){
+		if(c->qentry[i] && c->qentry[i]->op==otherop && c->qentry[i]->thread->altc==nil){
 			_threaddebug(DBGCHAN, "can rendez alt %p chan %p", a, c);
 			return 1;
 		}
@@ -460,7 +460,7 @@ altexec(Alt *a, int spl)
 	b = nil;
 	me = a->v;
 	for(i=0; i<c->nentry; i++)
-		if(c->qentry[i] && c->qentry[i]->op==otherop && c->qentry[i]->thread==nil)
+		if(c->qentry[i] && c->qentry[i]->op==otherop && c->qentry[i]->thread->altc==nil)
 			if(nrand(++n) == 0)
 				b = c->qentry[i];
 	if(b != nil){
@@ -488,7 +488,7 @@ altexec(Alt *a, int spl)
 				altcopy(waiter, me, c->e);
 		}
 		b->thread->altc = c;
-		_procwakeup(&b->thread->altrend);
+		_threadwakeup(&b->thread->altrend);
 		_threaddebug(DBGCHAN, "chanlock is %lud", *(ulong*)(void*)&chanlock);
 		_threaddebug(DBGCHAN, "unlocking the chanlock");
 		unlock(&chanlock);

src/libthread/main.c

@@ -49,9 +49,7 @@ main(int argc, char **argv)
 	a = _threadmalloc(sizeof *a, 1);
 	a->argc = argc;
 	a->argv = argv;
-malloc(10);
 	p = _newproc(mainlauncher, a, mainstacksize, "threadmain", 0, 0);
-malloc(10);
 	_schedinit(p);
 	abort();	/* not reached */
 	return 0;
@@ -62,9 +60,7 @@ mainlauncher(void *arg)
 {
 	Mainarg *a;
 
-malloc(10);
 	a = arg;
-malloc(10);
 	threadmain(a->argc, a->argv);
 	threadexits("threadmain");
 }

src/libthread/mkfile

@@ -41,6 +41,9 @@ HFILES=\
 
 <$PLAN9/src/mksyslib
 
+tfork: tfork.$O $PLAN9/lib/$LIB
+	$LD -o tfork tfork.$O $LDFLAGS -lthread -l9
+
 tprimes: tprimes.$O $PLAN9/lib/$LIB
 	$LD -o tprimes tprimes.$O $LDFLAGS -lthread -l9
 

src/libthread/sched.c

@@ -36,7 +36,6 @@ _schedinit(void *arg)
 	unlock(&p->lock);
 	while(_setlabel(&p->sched))
 		;
-malloc(10);
 	_threaddebug(DBGSCHED, "top of schedinit, _threadexitsallstatus=%p", _threadexitsallstatus);
 	if(_threadexitsallstatus)
 		_exits(_threadexitsallstatus);
@@ -148,12 +147,10 @@ relock:
 
 		_threaddebug(DBGSCHED, "sleeping for more work (%d threads)", p->nthreads);
 		q->asleep = 1;
-		unlock(&p->readylock);
-		while(rendezvous((ulong)q, 0) == ~0){
-			if(_threadexitsallstatus)
-				_exits(_threadexitsallstatus);
-		}
-		/* lock picked up from _threadready */
+		p->rend.l = &p->readylock;
+		_procsleep(&p->rend);
+		if(_threadexitsallstatus)
+			_exits(_threadexitsallstatus);
 	}
 	t = q->head;
 	q->head = t->next;
@@ -185,18 +182,15 @@ _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");
@@ -211,8 +205,6 @@ malloc(10);
 		}
 		t->state = Running;
 		t->nextstate = Ready;
-malloc(10);
-print("gotolabel\n");
 		_gotolabel(&t->sched);
 		for(;;);
 	}
@@ -253,13 +245,11 @@ _threadready(Thread *t)
 		assert(q->asleep == 1);
 		q->asleep = 0;
 		/* lock passes to runthread */
-		_threaddebug(DBGSCHED, "waking process %d", t->proc->pid);
-		while(rendezvous((ulong)q, 0) == ~0){
-			if(_threadexitsallstatus)
-				_exits(_threadexitsallstatus);
-		}
-	}else
-		unlock(&t->proc->readylock);
+		_procwakeup(&t->proc->rend);
+	}
+	unlock(&t->proc->readylock);
+	if(_threadexitsallstatus)
+		_exits(_threadexitsallstatus);
 }
 
 void

src/libthread/threadimpl.h

@@ -95,6 +95,8 @@ struct Thread
 	Chanstate	chan;		/* which channel operation is current */
 	Alt		*alt;			/* pointer to current alt structure (debugging) */
 	ulong		userpc;
+	Channel	*c;
+	pthread_cond_t cond;
 
 	void*	udata[NPRIV];	/* User per-thread data pointer */
 	int		lastfd;
@@ -136,6 +138,8 @@ struct Proc
 	uint		nextID;		/* ID of most recently created thread */
 	Proc		*next;		/* linked list of Procs */
 
+	_Procrend	rend;	/* sleep here for more ready threads */
+
 	void		*arg;			/* passed between shared and unshared stk */
 	char		str[ERRMAX];	/* used by threadexits to avoid malloc */
 	char		errbuf[ERRMAX];	/* errstr */

src/libthread/tprimes.c

@@ -41,7 +41,6 @@ threadmain(int argc, char **argv)
 	int i;
 	Channel *c;
 
-malloc(10);
 	ARGBEGIN{
 	case 'D':
 		_threaddebuglevel = atoi(ARGF());