ckdb - demote shift_rewards payouts lock to read - no payout data is changed

src/ckdb.h

@@ -55,7 +55,7 @@
 
 #define DB_VLOCK "1"
 #define DB_VERSION "1.0.2"
-#define CKDB_VERSION DB_VERSION"-1.230"
+#define CKDB_VERSION DB_VERSION"-1.231"
 
 #define WHERE_FFL " - from %s %s() line %d"
 #define WHERE_FFL_HERE __FILE__, __func__, __LINE__

src/ckdb_data.c

@@ -4682,7 +4682,7 @@ bool shift_rewards(K_ITEM *wm_item)
 	DATA_WORKMARKERS(wm, wm_item);
 
 	// Deadlock risk since calling code should have workmarkers locked
-	K_WLOCK(payouts_free);
+	K_RLOCK(payouts_free);
 	p_item = find_payouts_wid(wm->workinfoidend, ctx);
 	DATA_PAYOUTS_NULL(payouts, p_item);
 	// a workmarker should not cross a payout boundary
@@ -4693,7 +4693,7 @@ bool shift_rewards(K_ITEM *wm_item)
 		p_item = prev_in_ktree(ctx);
 		DATA_PAYOUTS_NULL(payouts, p_item);
 	}
-	K_WUNLOCK(payouts_free);
+	K_RUNLOCK(payouts_free);
 
 	wm->rewards = rewards;
 	return (rewards > 0);