public void set_callback (owned IOFunc func)
Sets the callback function for a source.
The callback for a source is called from the source's dispatch function.
The exact type of
func depends on the type of source; ie. you should not count on
func being called with
as its first parameter. Cast
G_SOURCE_FUNC to avoid warnings about incompatible function types.
See memory management of sources for details on how to handle memory management of
Typically, you won't use this function. Instead use functions specific to the type of source you are using, such as
It is safe to call this function multiple times on a source which has already been attached to a context. The changes will take effect for the next time the source is dispatched after this call returns.
Note that destroy for a currently attached source has the effect of also unsetting the callback.
a callback function
the data to pass to callback function
a function to call when