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-rw-r--r--spaghetti-monster/fsm-states.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/spaghetti-monster/fsm-states.h b/spaghetti-monster/fsm-states.h
index 7d9361b..9964bc1 100644
--- a/spaghetti-monster/fsm-states.h
+++ b/spaghetti-monster/fsm-states.h
@@ -40,6 +40,13 @@ void _set_state(StatePtr new_state, uint16_t arg,
int8_t push_state(StatePtr new_state, uint16_t arg);
StatePtr pop_state();
uint8_t set_state(StatePtr new_state, uint16_t arg);
+
+// if loop() needs to change state, use this instead of set_state()
+// (because this avoids race conditions)
+volatile StatePtr deferred_state;
+volatile uint16_t deferred_state_arg;
+void set_state_deferred(StatePtr new_state, uint16_t arg);
+
#ifndef DONT_USE_DEFAULT_STATE
uint8_t default_state(Event event, uint16_t arg);
#endif