mutex: add nxrmutex_is_recursive api

Signed-off-by: yinshengkai <yinshengkai@xiaomi.com>

include/nuttx/mutex.h

@@ -392,6 +392,22 @@ int nxrmutex_destroy(FAR rmutex_t *rmutex);
 
 bool nxrmutex_is_hold(FAR rmutex_t *rmutex);
 
+/****************************************************************************
+ * Name: nxrmutex_is_recursive
+ *
+ * Description:
+ *   This function check whether the recursive mutex is recursive
+ *
+ * Parameters:
+ *   rmutex - Recursive mutex descriptor.
+ *
+ * Return Value:
+ *  If rmutex has returned to True recursively, otherwise returns false.
+ *
+ ****************************************************************************/
+
+bool nxrmutex_is_recursive(FAR rmutex_t *rmutex);
+
 /****************************************************************************
  * Name: nxrmutex_get_holder
  *

libs/libc/misc/lib_mutex.c

@@ -553,6 +553,25 @@ bool nxrmutex_is_hold(FAR rmutex_t *rmutex)
   return nxmutex_is_hold(&rmutex->mutex);
 }
 
+/****************************************************************************
+ * Name: nxrmutex_is_recursive
+ *
+ * Description:
+ *   This function check whether the recursive mutex is recursive
+ *
+ * Parameters:
+ *   rmutex - Recursive mutex descriptor.
+ *
+ * Return Value:
+ *  If rmutex has returned to True recursively, otherwise returns false.
+ *
+ ****************************************************************************/
+
+bool nxrmutex_is_recursive(FAR rmutex_t *rmutex)
+{
+  return rmutex->count > 1;
+}
+
 /****************************************************************************
  * Name: nxrmutex_get_holder
  *