+ if(error)
+ *error = 0;
+ *reply = 0;
+
+ if(head)
+ {
+ if(((XCBGenericRep *) head->reply)->response_type == XCBError)
+ {
+ if(error)
+ *error = head->reply;
+ else
+ free(head->reply);
+ }
+ else
+ *reply = head->reply;
+
+ free(head);
+ }
+
+ return 1;
+}
+
+/* Public interface */
+
+void *XCBWaitForReply(XCBConnection *c, unsigned int request, XCBGenericError **e)
+{
+ void *ret = 0;
+ if(e)
+ *e = 0;
+
+ pthread_mutex_lock(&c->iolock);
+
+ /* If this request has not been written yet, write it. */
+ if(_xcb_out_flush_to(c, request))
+ {
+ pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
+ reader_list reader;
+ reader_list **prev_reader;
+
+ for(prev_reader = &c->in.readers;
+ *prev_reader &&
+ XCB_SEQUENCE_COMPARE ((*prev_reader)->request, <=, request);
+ prev_reader = &(*prev_reader)->next)
+ {
+ /* empty */;
+ }
+ reader.request = request;
+ reader.data = &cond;
+ reader.next = *prev_reader;
+ *prev_reader = &reader;
+
+ while(!poll_for_reply(c, request, &ret, e))
+ if(!_xcb_conn_wait(c, &cond, 0, 0))
+ break;
+
+ for(prev_reader = &c->in.readers;
+ *prev_reader &&
+ XCB_SEQUENCE_COMPARE((*prev_reader)->request, <=, request);
+ prev_reader = &(*prev_reader)->next)
+ {
+ if(*prev_reader == &reader)
+ {
+ *prev_reader = (*prev_reader)->next;
+ break;
+ }
+ }
+ pthread_cond_destroy(&cond);
+ }