Async DBusMessage reads using the C API

[Havoc Pennington]

On Fri, 2005-11-04 at 10:25 +0000, Matthew Johnson wrote:
> 
> void dbus_connection_read_write(DBusConnection* conn, dbus_uint32_t ms);
> 

"int timeout_milliseconds" for consistency with other stuff and to allow
-1 I think...

> We could also have it return a dbus_bool_t, true if the incoming queue
> is now non-empty? That can be checked when you pop_message though, so
> its less vital.

It's not quite a simple bool, see get_dispatch_status(). Also,
read_write_dispatch() returns a bool with another meaning.

> I'm happy to try and implement the blocking stuff, but I suspect others
> may be able to do so a lot easier. Some pointers as to useful functions
> would be good at the very least.

I think the right patch is probably:
 - make the body of read_write_dispatch() into a private function 
   that takes a "dbus_bool_t dispatch" argument
 - wrap it in two public functions, one that calls it with TRUE
   and another that calls with with FALSE

i.e. this is exactly like read_write_dispatch except it never
dispatches.

Havoc