@@ -157,6 +157,8 @@ typedef void WaitObjectFunc(void *opaque);
* in the main loop's calls to WaitForMultipleObjects. When the handle
* is in a signaled state, QEMU will call @func.
*
+ * If the same HANDLE is added twice, this function returns -1.
+ *
* @handle: The Windows handle to be observed.
* @func: A function to be called when @handle is in a signaled state.
* @opaque: A pointer-size value that is passed to @func.
@@ -373,10 +373,20 @@ static WaitObjects wait_objects = {0};
int qemu_add_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque)
{
+ int i;
WaitObjects *w = &wait_objects;
+
if (w->num >= MAXIMUM_WAIT_OBJECTS) {
return -1;
}
+
+ for (i = 0; i < w->num; i++) {
+ /* check if the same handle is added twice */
+ if (w->events[i] == handle) {
+ return -1;
+ }
+ }
+
w->events[w->num] = handle;
w->func[w->num] = func;
w->opaque[w->num] = opaque;