fsm: add functions for unlinking and changing parents

At the moment it is not possible to unlink a child from from
its parent, nor is it possible to assign a new parent to a
child FSM.

- osmo_fsm_inst_unlink_parent():
  Make it possible to unlink childs from a parent.

- osmo_fsm_inst_change_parent():
  Make it possible to change the parent of a child.

Change-Id: I6d18cbd4ada903cf3720b3ad2a89fc643085beef

1 files changed, 4 insertions, 0 deletions

diff --git a/include/osmocom/core/fsm.h b/include/osmocom/core/fsm.h
index 2fbb2501..8f550d14 100644
--- a/include/osmocom/core/fsm.h
+++ b/include/osmocom/core/fsm.h
@@ -150,6 +150,10 @@ struct osmo_fsm_inst *osmo_fsm_inst_alloc(struct osmo_fsm *fsm, void *ctx, void
 struct osmo_fsm_inst *osmo_fsm_inst_alloc_child(struct osmo_fsm *fsm,
 						struct osmo_fsm_inst *parent,
 						uint32_t parent_term_event);
+void osmo_fsm_inst_unlink_parent(struct osmo_fsm_inst *fi, void *ctx);
+void osmo_fsm_inst_change_parent(struct osmo_fsm_inst *fi,
+				 struct osmo_fsm_inst *new_parent,
+				 uint32_t new_parent_term_event);
 void osmo_fsm_inst_free(struct osmo_fsm_inst *fi);
 
 const char *osmo_fsm_event_name(struct osmo_fsm *fsm, uint32_t event);