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#pragma once
#include <stdint.h>
#include <stdbool.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/timer.h>
#include <osmocom/core/utils.h>
/*! \defgroup fsm Finite State Machine abstraction
* @{
*/
/*! \file fsm.h
* \brief Finite State Machine
*/
struct osmo_fsm_inst;
enum osmo_fsm_term_cause {
/*! \brief terminate because parent terminated */
OSMO_FSM_TERM_PARENT,
/*! \brief terminate on explicit user request */
OSMO_FSM_TERM_REQUEST,
/*! \brief regular termination of process */
OSMO_FSM_TERM_REGULAR,
/*! \brief erroneous termination of process */
OSMO_FSM_TERM_ERROR,
/*! \brief termination due to time-out */
OSMO_FSM_TERM_TIMEOUT,
};
/*! \brief description of a rule in the FSM */
struct osmo_fsm_state {
/*! \brief bit-mask of permitted input events for this state */
uint32_t in_event_mask;
/*! \brief bit-mask to which other states this state may transiton */
uint32_t out_state_mask;
/*! \brief human-readable name of this state */
const char *name;
/*! \brief function to be called for events arriving in this state */
void (*action)(struct osmo_fsm_inst *fi, uint32_t event, void *data);
/*! \brief function to be called just after entering the state */
void (*onenter)(struct osmo_fsm_inst *fi, uint32_t prev_state);
/*! \brief function to be called just before leaving the state */
void (*onleave)(struct osmo_fsm_inst *fi, uint32_t next_state);
};
/*! \brief a description of an osmocom finite state machine */
struct osmo_fsm {
/*! \brief global list */
struct llist_head list;
/*! \brief list of instances of this FSM */
struct llist_head instances;
/*! \brief human readable name */
const char *name;
/*! \brief table of state transition rules */
const struct osmo_fsm_state *states;
/*! \brief number of entries in \ref states */
unsigned int num_states;
/*! \brief bit-mask of events permitted in all states */
uint32_t allstate_event_mask;
/*! \brief function pointer to be called for allstate events */
void (*allstate_action)(struct osmo_fsm_inst *fi, uint32_t event, void *data);
/*! \breif clean-up function, called during termination */
void (*cleanup)(struct osmo_fsm_inst *fi, enum osmo_fsm_term_cause cause);
/*! \brief timer call-back for states with time-out.
* \returns 1 to request termination, 0 to keep running. */
int (*timer_cb)(struct osmo_fsm_inst *fi);
/*! \brief logging sub-system for this FSM */
int log_subsys;
/*! \brief human-readable names of events */
const struct value_string *event_names;
};
/*! \brief a single instanceof an osmocom finite state machine */
struct osmo_fsm_inst {
/*! \brief member in the fsm->instances list */
struct llist_head list;
/*! \brief back-pointer to the FSM of which we are an instance */
struct osmo_fsm *fsm;
/*! \brief human readable identifier */
const char *id;
/*! \brief human readable fully-qualified name */
const char *name;
/*! \brief some private data of this instance */
void *priv;
/*! \brief logging level for this FSM */
int log_level;
/*! \brief current state of the FSM */
uint32_t state;
/*! \brief timer number for states with time-out */
int T;
/*! \brief timer back-end for states with time-out */
struct osmo_timer_list timer;
/*! \brief support for fsm-based procedures */
struct {
/*! \brief the parent FSM that has created us */
struct osmo_fsm_inst *parent;
/*! \brief the event we should send upon termination */
uint32_t parent_term_event;
/*! \brief a list of children processes */
struct llist_head children;
/*! \brief \ref llist_head linked to parent->proc.children */
struct llist_head child;
} proc;
};
void osmo_fsm_log_addr(bool log_addr);
#define LOGPFSML(fi, level, fmt, args...) \
LOGP((fi)->fsm->log_subsys, level, "%s{%s}: " fmt, \
osmo_fsm_inst_name(fi), \
osmo_fsm_state_name((fi)->fsm, (fi)->state), ## args)
#define LOGPFSM(fi, fmt, args...) \
LOGPFSML(fi, (fi)->log_level, fmt, ## args)
int osmo_fsm_register(struct osmo_fsm *fsm);
void osmo_fsm_unregister(struct osmo_fsm *fsm);
struct osmo_fsm_inst *osmo_fsm_inst_alloc(struct osmo_fsm *fsm, void *ctx, void *priv,
int log_level, const char *id);
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_free(struct osmo_fsm_inst *fi);
const char *osmo_fsm_event_name(struct osmo_fsm *fsm, uint32_t event);
const char *osmo_fsm_inst_name(struct osmo_fsm_inst *fi);
const char *osmo_fsm_state_name(struct osmo_fsm *fsm, uint32_t state);
int osmo_fsm_inst_state_chg(struct osmo_fsm_inst *fi, uint32_t new_state,
unsigned long timeout_secs, int T);
int osmo_fsm_inst_dispatch(struct osmo_fsm_inst *fi, uint32_t event, void *data);
void osmo_fsm_inst_term(struct osmo_fsm_inst *fi,
enum osmo_fsm_term_cause cause, void *data);
/*! @} */
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