workqueue: add work_foreach support

Signed-off-by: ligd <liguiding1@xiaomi.com>

include/nuttx/wqueue.h

@@ -292,6 +292,10 @@ struct work_notifier_s
   worker_t worker;     /* The worker function to schedule */
 };
 
+/* This is the callback type used by work_foreach() */
+
+typedef CODE void (*work_foreach_t)(int tid, FAR void *arg);
+
 /****************************************************************************
  * Public Data
  ****************************************************************************/
@@ -381,6 +385,25 @@ int work_queue(int qid, FAR struct work_s *work, worker_t worker,
 
 int work_cancel(int qid, FAR struct work_s *work);
 
+/****************************************************************************
+ * Name: work_foreach
+ *
+ * Description:
+ *   Enumerate over each work thread and provide the tid of each task to a
+ *   user callback functions.
+ *
+ * Input Parameters:
+ *   qid     - The work queue ID
+ *   handler - The function to be called with the pid of each task
+ *   arg     - The function callback
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void work_foreach(int qid, work_foreach_t handler, FAR void *arg);
+
 /****************************************************************************
  * Name: work_available
  *