Call func for each transport managed by this.
The result value of func determines what happens to the transport. func will be called with
this locked so no further actions on this can be performed from
func.
If func returns REMOVE, the transport will be
removed from this.
If func returns KEEP, the transport will remain in
this.
If func returns REF, the transport will remain in
this but will also be added with an additional ref to the result List of this
function..
When func is null, REF
will be assumed for each transport.
| this |
a Stream |
| func |
a callback |
| user_data |
user data passed to |
|
a List with all transports for which |