shithub: clone

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don't wakeup wgwait unless it can continue

--- a/clone.c

+++ b/clone.c

@@ -114,11 +114,11 @@

 void

 wgdone(WaitGroup *wg)

 {

-	if(decref(wg) < 0)

-		sysfatal("wgdone: negative WaitGroup count");

-	qlock(wg);

-	rwakeupall(wg);

-	qunlock(wg);

+	if(decref(wg) == 0){

+		qlock(wg);

+		rwakeupall(wg);

+		qunlock(wg);

+	}

 }

 void

@@ -125,11 +125,10 @@

 wgwait(WaitGroup *wg)

 {

 	qlock(wg);

-	while(!(wg->ref == 0))

+	while(wg->ref != 0)

 		rsleep(wg);

 	qunlock(wg);

 }

-

 char *

 filename(char *s)