flag used for actor stopping insetad of counter

source/cell_internal.h

@@ -1,5 +1,6 @@
 
 #include <pthread.h>
+#include <stdatomic.h>
 
 /* Letter type for unified message queue */
 typedef enum {
@@ -67,8 +68,7 @@ typedef struct cell_rt {
   int affinity;
 
   uint64_t turn_start_ns;       // cell_ns() when turn began
-  uint64_t turn_deadline_ns;    // turn_start_ns + fast or slow timer
-  int is_slow_turn;             // 1 if running under slow timer
+  _Atomic uint32_t turn_gen;    // incremented each turn start
   int slow_strikes;             // consecutive slow-completed turns
   int vm_suspended;             // 1 if VM is paused mid-turn
 
@@ -93,7 +93,6 @@ void actor_clock(cell_rt *actor, JSValue fn);
 uint32_t actor_delay(cell_rt *actor, JSValue fn, double seconds);
 JSValue actor_remove_timer(cell_rt *actor, uint32_t timer_id);
 void exit_handler(void);
-int actor_interrupt_cb(JSRuntime *rt, cell_rt *crt);
 void actor_loop();
 void actor_initialize(void);
 void actor_free(cell_rt *actor);