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authorPhilipp Maier <pmaier@sysmocom.de>2018-02-14 18:20:07 +0100
committerHarald Welte <laforge@gnumonks.org>2018-02-19 08:30:21 +0000
commitd1f5793b5e89426927d57cff7f6951e0c2e29d92 (patch)
tree56cc46cfdf3ee7026ab4b4d9968c2c31d0441145 /src/fsm.c
parent4a8a9f4210b01c3b8b75eb3b984c9127e90d8c54 (diff)
fsm: allow graceful exit on FSM termination
The function _osmo_fsm_inst_term() terminates all child FSMs befor it calls fi->fsm_cleanup(). This prevents the cleanup callback to perform last actions on the child FSMs (e.g. osmo_fsm_inst_unlink_parent()). - Since moving the cleanup callack to the beginning of the function would alter the termination behavior and possibly cause malfunction in already existing implementation that use OSMO fsm, a new optional callback that is called immediately at the beginning of the terminatopn process is added. Change-Id: I0fdda9fe994753f975a658c0f3fb3615949cc8bb Closes: OS#2915
Diffstat (limited to 'src/fsm.c')
-rw-r--r--src/fsm.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/src/fsm.c b/src/fsm.c
index a1273624..176aa8ab 100644
--- a/src/fsm.c
+++ b/src/fsm.c
@@ -298,7 +298,11 @@ struct osmo_fsm_inst *osmo_fsm_inst_alloc_child(struct osmo_fsm *fsm,
/*! unlink child FSM from its parent FSM.
* \param[in] fi Descriptor of the child FSM to unlink.
- * \param[in] ctx New talloc context */
+ * \param[in] ctx New talloc context
+ *
+ * Never call this function from the cleanup callback, because at that time
+ * the child FSMs will already be terminated. If unlinking should be performed
+ * on FSM termination, use the grace callback instead. */
void osmo_fsm_inst_unlink_parent(struct osmo_fsm_inst *fi, void *ctx)
{
if (fi->proc.parent) {
@@ -312,7 +316,10 @@ void osmo_fsm_inst_unlink_parent(struct osmo_fsm_inst *fi, void *ctx)
/*! change parent instance of an FSM.
* \param[in] fi Descriptor of the to-be-allocated FSM.
* \param[in] new_parent New parent FSM instance.
- * \param[in] new_parent_term_event Event to be sent to parent when terminating. */
+ * \param[in] new_parent_term_event Event to be sent to parent when terminating.
+ *
+ * Never call this function from the cleanup callback!
+ * (see also osmo_fsm_inst_unlink_parent()).*/
void osmo_fsm_inst_change_parent(struct osmo_fsm_inst *fi,
struct osmo_fsm_inst *new_parent,
uint32_t new_parent_term_event)
@@ -528,6 +535,10 @@ void _osmo_fsm_inst_term(struct osmo_fsm_inst *fi,
LOGPFSMSRC(fi, file, line, "Terminating (cause = %s)\n",
osmo_fsm_term_cause_name(cause));
+ /* graceful exit (optional) */
+ if (fi->fsm->pre_term)
+ fi->fsm->pre_term(fi, cause);
+
_osmo_fsm_inst_term_children(fi, OSMO_FSM_TERM_PARENT, NULL,
file, line);