X-Git-Url: http://git.ozlabs.org/?a=blobdiff_plain;f=ccan%2Fio%2Fio.h;h=4468cee3ab0d10d14aacd6cc3cfa3462bc8ec114;hb=5a510ed5696255910fd42adb47d7c1ffa728a116;hp=6248fec02c2e5c5ae3d42e65d80eb8483af1d5aa;hpb=8700faf27fe4cf9554fec2260bdabd67eabf69ae;p=ccan

diff --git a/ccan/io/io.h b/ccan/io/io.h
index 6248fec0..4468cee3 100644
--- a/ccan/io/io.h
+++ b/ccan/io/io.h
@@ -431,6 +431,21 @@ struct io_conn *io_duplex_(struct io_conn *conn, struct io_plan plan);
 #define io_wake(conn, plan) (io_plan_no_debug(), io_wake_((conn), (plan)))
 void io_wake_(struct io_conn *conn, struct io_plan plan);
 
+/**
+ * io_is_idle - is a connection idle?
+ *
+ * This can be useful for complex protocols, eg. where you want a connection
+ * to send something, so you queue it and wake it if it's idle.
+ *
+ * Example:
+ *	struct io_conn *sleeper;
+ *	sleeper = io_new_conn(open("/dev/null", O_RDONLY), io_idle());
+ *
+ *	assert(io_is_idle(sleeper));
+ *	io_wake(sleeper, io_write("junk", 4, io_close_cb, NULL));
+ */
+bool io_is_idle(const struct io_conn *conn);
+
 /**
  * io_break - return from io_loop()
  * @ret: non-NULL value to return from io_loop().