Specifies the type of function passed to g_timeout_add(), g_timeout_add_full(), g_idle_add(), and g_idle_add_full().
%FALSE if the source should be removed. #G_SOURCE_CONTINUE and #G_SOURCE_REMOVE are more memorable names for the return value.
See Implementation
Specifies the type of function passed to g_timeout_add(), g_timeout_add_full(), g_idle_add(), and g_idle_add_full().