New uev_*_active() API: check if watcher is active

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

private.h

@@ -81,11 +81,12 @@ struct uev;
 	uev_type_t
 
 /* Internal API for dealing with generic watchers */
-int uev_watcher_init (uev_ctx_t *ctx, struct uev *w, uev_type_t type,
-		      void (*cb)(struct uev *, void *, int), void *arg,
-		      int fd, int events);
-int uev_watcher_start(struct uev *w);
-int uev_watcher_stop (struct uev *w);
+int uev_watcher_init  (uev_ctx_t *ctx, struct uev *w, uev_type_t type,
+		       void (*cb)(struct uev *, void *, int), void *arg,
+		       int fd, int events);
+int uev_watcher_start (struct uev *w);
+int uev_watcher_stop  (struct uev *w);
+int uev_watcher_active(struct uev *w);
 
 #endif /* LIBUEV_PRIVATE_H_ */
 

uev.c

@@ -124,6 +124,15 @@ int uev_watcher_stop(uev_t *w)
 	return 0;
 }
 
+/* Private to libuEv, do not use directly! */
+int uev_watcher_active(uev_t *w)
+{
+	if (!w)
+		return 0;
+
+	return w->active;
+}
+
 /**
  * Create an event loop context
  * @param ctx  Pointer to an uev_ctx_t context to be initialized

uev.h

@@ -41,6 +41,12 @@
 #define UEV_ONCE        1
 #define UEV_NONBLOCK    2
 
+/* Macros */
+#define uev_io_active(w)     uev_watcher_active(w)
+#define uev_timer_active(w)  uev_watcher_active(w)
+#define uev_cron_active(w)   uev_watcher_active(w)
+#define uev_signal_active(w) uev_watcher_active(w)
+
 /* Event watcher */
 typedef struct uev {
 	/* Private data for libuEv internal engine */