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/*! \file fsm.h
* Finite State Machine
*/
#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 */
struct osmo_fsm_inst;
enum osmo_fsm_term_cause {
/*! terminate because parent terminated */
OSMO_FSM_TERM_PARENT,
/*! terminate on explicit user request */
OSMO_FSM_TERM_REQUEST,
/*! regular termination of process */
OSMO_FSM_TERM_REGULAR,
/*! erroneous termination of process */
OSMO_FSM_TERM_ERROR,
/*! termination due to time-out */
OSMO_FSM_TERM_TIMEOUT,
};
extern const struct value_string osmo_fsm_term_cause_names[];
static inline const char *osmo_fsm_term_cause_name(enum osmo_fsm_term_cause cause)
{
return get_value_string(osmo_fsm_term_cause_names, cause);
}
/*! description of a rule in the FSM */
struct osmo_fsm_state {
/*! bit-mask of permitted input events for this state */
uint32_t in_event_mask;
/*! bit-mask to which other states this state may transiton */
uint32_t out_state_mask;
/*! human-readable name of this state */
const char *name;
/*! function to be called for events arriving in this state */
void (*action)(struct osmo_fsm_inst *fi, uint32_t event, void *data);
/*! function to be called just after entering the state */
void (*onenter)(struct osmo_fsm_inst *fi, uint32_t prev_state);
/*! function to be called just before leaving the state */
void (*onleave)(struct osmo_fsm_inst *fi, uint32_t next_state);
};
/*! a description of an osmocom finite state machine */
struct osmo_fsm {
/*! global list */
struct llist_head list;
/*! list of instances of this FSM */
struct llist_head instances;
/*! human readable name */
const char *name;
/*! table of state transition rules */
const struct osmo_fsm_state *states;
/*! number of entries in \ref states */
unsigned int num_states;
/*! bit-mask of events permitted in all states */
uint32_t allstate_event_mask;
/*! function pointer to be called for allstate events */
void (*allstate_action)(struct osmo_fsm_inst *fi, uint32_t event, void *data);
/*! clean-up function, called during termination */
void (*cleanup)(struct osmo_fsm_inst *fi, enum osmo_fsm_term_cause cause);
/*! 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);
/*! logging sub-system for this FSM */
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 */
struct osmo_fsm_inst {
/*! member in the fsm->instances list */
struct llist_head list;
/*! back-pointer to the FSM of which we are an instance */
struct osmo_fsm *fsm;
/*! human readable identifier */
const char *id;
/*! human readable fully-qualified name */
const char *name;
/*! some private data of this instance */
void *priv;
/*! logging level for this FSM */
int log_level;
/*! current state of the FSM */
uint32_t state;
/*! timer number for states with time-out */
int T;
/*! timer back-end for states with time-out */
struct osmo_timer_list timer;
/*! support for fsm-based procedures */
struct {
/*! the parent FSM that has created us */
struct osmo_fsm_inst *parent;
/*! the event we should send upon termination */
uint32_t parent_term_event;
/*! a list of children processes */
struct llist_head children;
/*! \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, OSMO_MAX(level, (fi)->log_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)
#define LOGPFSMLSRC(fi, level, caller_file, caller_line, fmt, args...) \
LOGPSRC((fi)->fsm->log_subsys, level, \
caller_file, caller_line, \
"%s{%s}: " fmt, \
osmo_fsm_inst_name(fi), \
osmo_fsm_state_name((fi)->fsm, (fi)->state), \
## args)
#define LOGPFSMSRC(fi, caller_file, caller_line, fmt, args...) \
LOGPFSMLSRC(fi, (fi)->log_level, \
caller_file, caller_line, \
fmt, ## args)
int osmo_fsm_register(struct osmo_fsm *fsm);
void osmo_fsm_unregister(struct osmo_fsm *fsm);
struct osmo_fsm *osmo_fsm_find_by_name(const char *name);
struct osmo_fsm_inst *osmo_fsm_inst_find_by_name(const struct osmo_fsm *fsm,
const char *name);
struct osmo_fsm_inst *osmo_fsm_inst_find_by_id(const struct osmo_fsm *fsm,
const char *id);
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_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);
int osmo_fsm_inst_update_id(struct osmo_fsm_inst *fi, const char *id);
int osmo_fsm_inst_update_id_f(struct osmo_fsm_inst *fi, const char *fmt, ...);
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);
/*! return the name of the state the FSM instance is currently in. */
static inline const char *osmo_fsm_inst_state_name(struct osmo_fsm_inst *fi)
{ return osmo_fsm_state_name(fi->fsm, fi->state); }
/*! perform a state change of the given FSM instance
*
* This is a macro that calls _osmo_fsm_inst_state_chg() with the given
* parameters as well as the caller's source file and line number for logging
* purposes. See there for documentation.
*/
#define osmo_fsm_inst_state_chg(fi, new_state, timeout_secs, T) \
_osmo_fsm_inst_state_chg(fi, new_state, timeout_secs, T, \
__BASE_FILE__, __LINE__)
int _osmo_fsm_inst_state_chg(struct osmo_fsm_inst *fi, uint32_t new_state,
unsigned long timeout_secs, int T,
const char *file, int line);
/*! perform a state change while keeping the current timer running.
*
* This is useful to keep a timeout across several states (without having to round the
* remaining time to seconds).
*
* This is a macro that calls _osmo_fsm_inst_state_chg_keep_timer() with the given
* parameters as well as the caller's source file and line number for logging
* purposes. See there for documentation.
*/
#define osmo_fsm_inst_state_chg_keep_timer(fi, new_state) \
_osmo_fsm_inst_state_chg_keep_timer(fi, new_state, \
__BASE_FILE__, __LINE__)
int _osmo_fsm_inst_state_chg_keep_timer(struct osmo_fsm_inst *fi, uint32_t new_state,
const char *file, int line);
/*! dispatch an event to an osmocom finite state machine instance
*
* This is a macro that calls _osmo_fsm_inst_dispatch() with the given
* parameters as well as the caller's source file and line number for logging
* purposes. See there for documentation.
*/
#define osmo_fsm_inst_dispatch(fi, event, data) \
_osmo_fsm_inst_dispatch(fi, event, data, __BASE_FILE__, __LINE__)
int _osmo_fsm_inst_dispatch(struct osmo_fsm_inst *fi, uint32_t event, void *data,
const char *file, int line);
/*! Terminate FSM instance with given cause
*
* This is a macro that calls _osmo_fsm_inst_term() with the given parameters
* as well as the caller's source file and line number for logging purposes.
* See there for documentation.
*/
#define osmo_fsm_inst_term(fi, cause, data) \
_osmo_fsm_inst_term(fi, cause, data, __BASE_FILE__, __LINE__)
void _osmo_fsm_inst_term(struct osmo_fsm_inst *fi,
enum osmo_fsm_term_cause cause, void *data,
const char *file, int line);
/*! Terminate all child FSM instances of an FSM instance.
*
* This is a macro that calls _osmo_fsm_inst_term_children() with the given
* parameters as well as the caller's source file and line number for logging
* purposes. See there for documentation.
*/
#define osmo_fsm_inst_term_children(fi, cause, data) \
_osmo_fsm_inst_term_children(fi, cause, data, __BASE_FILE__, __LINE__)
void _osmo_fsm_inst_term_children(struct osmo_fsm_inst *fi,
enum osmo_fsm_term_cause cause,
void *data,
const char *file, int line);
/*! @} */
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