Use a separate variable for the exit condition

test/iomux_wake.c

@@ -8,21 +8,24 @@
 
 pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
 static int counter = 0;
+static int please_exit = 0;
 
 void wake_cb(struct IOMuxWaker *wk)
 {
     int local_counter;
+    int exit_now;
     int rc;
 
     rc = pthread_mutex_lock(&lock);
     assert(rc == 0);
     local_counter = counter;
+    exit_now = please_exit;
     printf("counter is %d\n", local_counter);
 
     rc = pthread_mutex_unlock(&lock);
     assert(rc == 0);
 
-    if (local_counter == 13) {
+    if (exit_now) {
         rc = uc_iomux_waker_destroy(wk);
         assert(rc == 0);
     }
@@ -59,6 +62,15 @@ void *waker(void *arg)
         rc = uc_iomux_waker_signal(s);
         assert(rc == 0);
     }
+    rc =  pthread_mutex_lock(&lock);
+    assert(rc == 0);
+    please_exit = 1;
+    //must wake it inside the mutex, else we risk a race
+    //when the waker is  destroyed 
+    rc = uc_iomux_waker_signal(s);
+    assert(rc == 0);
+
+    rc = pthread_mutex_unlock(&lock);
 
     return NULL;
 }