--- /dev/null
+#include <stdlib.h>
+#include <assert.h>
+#include <stdio.h>
+#include <threads.h>
+#include <stdatomic.h>
+
+#include "model-assert.h"
+
+#include "deque.h"
+
+Deque *q;
+int a;
+int b;
+int c;
+
+static void task(void * param) {
+ a=steal(q);
+}
+
+int user_main(int argc, char **argv)
+{
+ thrd_t t;
+ q=create();
+ thrd_create(&t, task, 0);
+ push(q, 1);
+ push(q, 2);
+ push(q, 4);
+ b=take(q);
+ c=take(q);
+ thrd_join(t);
+
+ bool correct=true;
+ if (a!=1 && a!=2 && a!=4 && a!= EMPTY)
+ correct=false;
+ if (b!=1 && b!=2 && b!=4 && b!= EMPTY)
+ correct=false;
+ if (c!=1 && c!=2 && c!=4 && a!= EMPTY)
+ correct=false;
+ if (a!=EMPTY && b!=EMPTY && c!=EMPTY && (a+b+c)!=7)
+ correct=false;
+ if (!correct)
+ printf("a=%d b=%d c=%d\n",a,b,c);
+ MODEL_ASSERT(correct);
+
+ return 0;
+}