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Harald Welte gerrit-no-reply at lists.osmocom.orgHarald Welte has submitted this change and it was merged. Change subject: fsm: allow graceful exit on FSM termination ...................................................................... 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 --- M TODO-RELEASE M include/osmocom/core/fsm.h M src/fsm.c 3 files changed, 16 insertions(+), 2 deletions(-) Approvals: Harald Welte: Looks good to me, approved Jenkins Builder: Verified diff --git a/TODO-RELEASE b/TODO-RELEASE index 782ba19..928b18d 100644 --- a/TODO-RELEASE +++ b/TODO-RELEASE @@ -10,3 +10,4 @@ core msgb_queue_free() add inline func to msgb.h coding gsm0503_rach_ext-encode() add func to gsm0503_coding.h codec ecu.c / ecu.h implement ECU for FR (Error Concealment Unit) +fsm fsmc / fsm.h added callback for graceful exit => ABI changed \ No newline at end of file diff --git a/include/osmocom/core/fsm.h b/include/osmocom/core/fsm.h index bbfe312..2c2a996 100644 --- a/include/osmocom/core/fsm.h +++ b/include/osmocom/core/fsm.h @@ -78,6 +78,8 @@ int log_subsys; /*! human-readable names of events */ const struct value_string *event_names; + /*! graceful exit function, called at the beginning of termination */ + void (*pre_term)(struct osmo_fsm_inst *fi, enum osmo_fsm_term_cause cause); }; /*! a single instanceof an osmocom finite state machine */ diff --git a/src/fsm.c b/src/fsm.c index a127362..176aa8a 100644 --- a/src/fsm.c +++ b/src/fsm.c @@ -298,7 +298,11 @@ /*! 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 @@ /*! 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 @@ 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); -- To view, visit https://gerrit.osmocom.org/6452 To unsubscribe, visit https://gerrit.osmocom.org/settings Gerrit-MessageType: merged Gerrit-Change-Id: I0fdda9fe994753f975a658c0f3fb3615949cc8bb Gerrit-PatchSet: 4 Gerrit-Project: libosmocore Gerrit-Branch: master Gerrit-Owner: dexter <pmaier at sysmocom.de> Gerrit-Reviewer: Harald Welte <laforge at gnumonks.org> Gerrit-Reviewer: Jenkins Builder Gerrit-Reviewer: dexter <pmaier at sysmocom.de>