1 files changed, 12 insertions, 2 deletions

diff --git a/concurrency.c b/concurrency.c
index 9670866..6719e6a 100644
--- a/concurrency.c
+++ b/concurrency.c
@@ -12,6 +12,8 @@ struct SpawnData
 	Array *name;
 	Array *left;
 	Array *right;
+	QLock lock;
+	Rendez done;
 };
 
 static void newprocfn(SpawnData *);
@@ -64,18 +66,22 @@ spawnthread(Function f, Array *name, Array *left, Array *right)
 		unlock datastructures
 		exit proc
 	*/
-	SpawnData *sp = emalloc(sizeof(SpawnData));
+	SpawnData *sp = emallocz(sizeof(SpawnData), 1);
 	sp->func = dupfunction(f);
 	sp->func.scope = dupscope(f.scope);
 	sp->name = duparray(name);
 	sp->left = left ? duparray(left) : nil;
 	sp->right = duparray(right);
-
+	sp->done.l = &sp->lock;
+	
+	qlock(&sp->lock);
 	int id = rfork(RFPROC|RFMEM);
 	if(id == 0){ /* in new process*/
 		newprocfn(sp);
 		exits(nil);
 	}
+	rsleep(&sp->done);
+	qunlock(&sp->lock);
 	return id;
 }
 
@@ -189,8 +195,12 @@ Retry:
 static void
 newprocfn(SpawnData *sp)
 {
+	qlock(&sp->lock);
 	ThreadData *td = newthreaddata(sp->name);
 	_privates[0] = td;
+	rwakeup(&sp->done);
+	qunlock(&sp->lock);
+
 	ErrorGuard *eg = newerrorguard(mkscalarint(0), nil); /* make a catch-all error guard */
 	if(setjmp(eg->jmp))
 		displayerror();