setCallback

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 @data as its first parameter. Cast @func with func@GLib.SOURCE_FUNC to avoid warnings about incompatible function types.

See main-loop.html#memory-management-of-sources for details on how to handle memory management of @data.

Typically, you won't use this function. Instead use functions specific to the type of source you are using, such as func@GLib.idle_add or func@GLib.timeout_add.

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 method@GLib.Source.destroy for a currently attached source has the effect of also unsetting the callback.

Parameters