Signed-off-by: Angus Salkeld <[email protected]>
---
exec/Makefile.am | 2 +-
exec/fsm.h | 125 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 126 insertions(+), 1 deletions(-)
create mode 100644 exec/fsm.h
diff --git a/exec/Makefile.am b/exec/Makefile.am
index b2935de..a3a49bf 100644
--- a/exec/Makefile.am
+++ b/exec/Makefile.am
@@ -75,7 +75,7 @@ noinst_HEADERS = apidef.h crypto.h
mainconfig.h main.h tsafe.h \
quorum.h service.h sync.h timer.h tlist.h
totemconfig.h \
totemmrp.h totemnet.h totemudp.h totemiba.h
totemrrp.h \
totemsrp.h util.h vsf.h wthread.h schedwrk.h \
- evil.h syncv2.h
+ evil.h syncv2.h fsm.h
EXTRA_DIST = $(LCRSO_SRC)
diff --git a/exec/fsm.h b/exec/fsm.h
new file mode 100644
index 0000000..fbb0c7f
--- /dev/null
+++ b/exec/fsm.h
@@ -0,0 +1,125 @@
+/*
+ * Copyright (c) 2010 Red Hat
+ *
+ * All rights reserved.
+ *
+ * Author: Angus Salkeld <[email protected]>
+ *
+ * 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>
+
+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);
+#define CS_FSM_NEXT_STATE_SIZE 32
+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)
+{
+ 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;
+ }
+ }
+ log_printf (LOGSYS_LEVEL_ERROR, "Fsm:%s could not find event \"%s\" in
state \"%s\"",
+ fsm->name, fsm->event_to_str(fsm, new_event),
fsm->state_to_str(fsm, fsm->curr_state));
+ sleep(3);
+ assert (0 && "event not found");
+}
+
+static inline void cs_fsm_state_set (struct cs_fsm* fsm, int32_t next_state,
void* data)
+{
+ 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) {
+ log_printf (LOGSYS_LEVEL_INFO, "Fsm:%s event \"%s\",
state \"%s\" --> \"%s\"\n",
+ fsm->name,
+ fsm->event_to_str(fsm, entry->event),
+ fsm->state_to_str(fsm,
fsm->table[fsm->curr_entry].curr_state),
+ fsm->state_to_str(fsm, next_state));
+ fsm->curr_state = next_state;
+ return;
+ }
+ }
+ log_printf (LOGSYS_LEVEL_CRIT, "Fsm:%s Can't change state from \"%s\"
to \"%s\" (event was \"%s\")\n",
+ fsm->name,
+ fsm->state_to_str(fsm, fsm->table[fsm->curr_entry].curr_state),
+ fsm->state_to_str(fsm, next_state),
+ fsm->event_to_str(fsm, entry->event));
+ sleep(3);
+ assert (0 && "invalid next state");
+}
+
+#endif /* FSM_H_DEFINED */
+
+
--
1.7.2.2
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