Correctly reset flag in cv_reset()

Author: shikokuchuo

NEWS.md

@@ -2,6 +2,7 @@
 
 #### Updates
 
+* `cv_reset()` now correctly resets the flag in the case a flag event has already been registered with `pipe_notify()`.
 * The previous `listen()` and `dial()` argument `error`, removed in v1.6.0, is now defunct.
 * The previous `serial_config()` argument `vec`, unutilised since v1.6.0, is removed.
 

src/sync.c

@@ -360,7 +360,7 @@ SEXP rnng_cv_reset(SEXP cvar) {
   nng_mtx *mtx = ncv->mtx;
 
   nng_mtx_lock(mtx);
-  ncv->flag = 0;
+  ncv->flag = ncv->flag < 0;
   ncv->condition = 0;
   nng_mtx_unlock(mtx);