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Diffstat (limited to '')
| -rw-r--r-- | exec/fsm.h | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/exec/fsm.h b/exec/fsm.h new file mode 100644 index 0000000..87efd7d --- /dev/null +++ b/exec/fsm.h @@ -0,0 +1,131 @@ +/* + * Copyright (c) 2010-2012 Red Hat + * + * All rights reserved. + * + * Author: Angus Salkeld <asalkeld@redhat.com> + * + * This software licensed under BSD license, the text of which follows: + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * - Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * - Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * - Neither the name of the MontaVista Software, Inc. nor the names of its + * contributors may be used to endorse or promote products derived from this + * software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF + * THE POSSIBILITY OF SUCH DAMAGE. + */ +#ifndef FSM_H_DEFINED +#define FSM_H_DEFINED + +#include <sys/time.h> +#include <corosync/corotypes.h> +#include "util.h" + +struct cs_fsm; +struct cs_fsm_entry; +typedef void (*cs_fsm_event_action_fn)(struct cs_fsm* fsm, int32_t event, void * data); +typedef const char * (*cs_fsm_state_to_str_fn)(struct cs_fsm* fsm, int32_t state); +typedef const char * (*cs_fsm_event_to_str_fn)(struct cs_fsm* fsm, int32_t event); + +typedef void (*cs_fsm_cb)(struct cs_fsm *fsm, int cb_event, int32_t curr_state, + int32_t next_state, int32_t fsm_event, void *data); + +#define CS_FSM_NEXT_STATE_SIZE 32 + +#define CS_FSM_STATE_NONE -1 + +#define CS_FSM_CB_EVENT_PROCESS_NF 0 +#define CS_FSM_CB_EVENT_STATE_SET 1 +#define CS_FSM_CB_EVENT_STATE_SET_NF 2 + +struct cs_fsm_entry { + int32_t curr_state; + int32_t event; + cs_fsm_event_action_fn handler_fn; + int32_t next_states[CS_FSM_NEXT_STATE_SIZE]; +}; + +struct cs_fsm { + const char *name; + int32_t curr_state; + int32_t curr_entry; + size_t entries; + struct cs_fsm_entry *table; + cs_fsm_state_to_str_fn state_to_str; + cs_fsm_event_to_str_fn event_to_str; +}; + +/* + * the table entry is defined by the state + event (curr_entry). + * so cs_fsm_process() sets the entry and cs_fsm_state_set() + * sets the new state. + */ +static inline void cs_fsm_process (struct cs_fsm *fsm, int32_t new_event, void * data, cs_fsm_cb cb) +{ + int32_t i; + + for (i = 0; i < fsm->entries; i++) { + if (fsm->table[i].event == new_event && + fsm->table[i].curr_state == fsm->curr_state) { + + assert (fsm->table[i].handler_fn != NULL); + /* set current entry */ + fsm->curr_entry = i; + fsm->table[i].handler_fn (fsm, new_event, data); + return; + } + } + + if (cb != NULL) { + cb(fsm, CS_FSM_CB_EVENT_PROCESS_NF, fsm->curr_state, CS_FSM_STATE_NONE, new_event, data); + } +} + +static inline void cs_fsm_state_set (struct cs_fsm* fsm, int32_t next_state, void* data, cs_fsm_cb cb) +{ + int i; + struct cs_fsm_entry *entry = &fsm->table[fsm->curr_entry]; + + if (fsm->curr_state == next_state) { + return; + } + /* + * confirm that "next_state" is in the current entry's next list + */ + for (i = 0; i < CS_FSM_NEXT_STATE_SIZE; i++) { + if (entry->next_states[i] < 0) { + break; + } + if (entry->next_states[i] == next_state) { + if (cb != NULL) { + cb(fsm, CS_FSM_CB_EVENT_STATE_SET, fsm->curr_state, next_state, entry->event, data); + } + fsm->curr_state = next_state; + return; + } + } + if (cb != NULL) { + cb(fsm, CS_FSM_CB_EVENT_STATE_SET_NF, fsm->curr_state, next_state, entry->event, data); + } +} + +#endif /* FSM_H_DEFINED */ + + |