*/
XCBGenericEvent *XCBPollForEvent(XCBConnection *c, int *error);
+/**
+ * @brief Return the error for a request, or NULL if none can ever arrive.
+ * @param c: The connection to the X server.
+ * @param cookie: The request cookie.
+ * @return The error for the request, or NULL if none can ever arrive.
+ *
+ * The XCBVoidCookie cookie supplied to this function must have resulted from
+ * a call to XCB[RequestName]Checked(). This function will block until one of
+ * two conditions happens. If an error is received, it will be returned. If
+ * a reply to a subsequent request has already arrived, no error can arrive
+ * for this request, so this function will return NULL.
+ *
+ * Note that this function will perform a sync if needed to ensure that the
+ * sequence number will advance beyond that provided in cookie; this is a
+ * convenience to avoid races in determining whether the sync is needed.
+ */
+XCBGenericError *XCBRequestCheck(XCBConnection *c, XCBVoidCookie cookie);
+
/**
* @brief Returns the last sequence number that the server is known to
* have processed.
return ret;
}
+XCBGenericError *XCBRequestCheck(XCBConnection *c, XCBVoidCookie cookie)
+{
+ /* FIXME: this could hold the lock to avoid syncing unnecessarily, but
+ * that would require factoring the locking out of XCBGetInputFocus,
+ * XCBGetInputFocusReply, and XCBWaitForReply. */
+ XCBGenericError *ret;
+ void *reply;
+ if(XCB_SEQUENCE_COMPARE(cookie.request,>,c->in.request_expected)
+ && XCB_SEQUENCE_COMPARE(cookie.request,>,c->in.request_completed))
+ {
+ free(XCBGetInputFocusReply(c, XCBGetInputFocus(c), &ret));
+ assert(!ret);
+ }
+ reply = XCBWaitForReply(c, cookie.request, &ret);
+ assert(!reply);
+ return ret;
+}
+
unsigned int XCBGetRequestRead(XCBConnection *c)
{
unsigned int ret;