diff --git a/HISTORY b/HISTORY
index 0df82e3..0832899 100644
--- a/HISTORY
+++ b/HISTORY
@@ -1,11 +1,12 @@
 
-Version 1.49  2021-03-28
+Version 1.49  2021-04-07
   * add macros: FC_ABS and FC_NEGATIVE
   * uniq_skiplist.c: add uniq_skiplist_pair struct and init function
   * add functions: fc_mkdirs and str_replace
   * add FilenameString type and macro
   * add functions: fc_string_case_compare, fc_string_case_equal etc.
-  * add functions: fc_check_filename_ex
+  * add function: fc_check_filename_ex
+  * add functions: fc_queue_push_queue_to_tail etc.
 
 Version 1.48  2021-02-01
   * fast_buffer.[hc]: add function fast_buffer_append_binary
diff --git a/src/fc_queue.c b/src/fc_queue.c
index 5e27bf7..8c4c892 100644
--- a/src/fc_queue.c
+++ b/src/fc_queue.c
@@ -135,6 +135,26 @@ void fc_queue_push_queue_to_head_ex(struct fc_queue *queue,
     PTHREAD_MUTEX_UNLOCK(&queue->lc_pair.lock);
 }
 
+void fc_queue_push_queue_to_tail_ex(struct fc_queue *queue,
+        struct fc_queue_info *qinfo, bool *notify)
+{
+    if (qinfo->head == NULL) {
+        *notify = false;
+        return;
+    }
+
+    PTHREAD_MUTEX_LOCK(&queue->lc_pair.lock);
+    if (queue->head == NULL) {
+        queue->head = qinfo->head;
+        *notify = true;
+    } else {
+        FC_QUEUE_NEXT_PTR(queue, queue->tail) = qinfo->head;
+        *notify = false;
+    }
+    queue->tail = qinfo->tail;
+    PTHREAD_MUTEX_UNLOCK(&queue->lc_pair.lock);
+}
+
 void fc_queue_pop_to_queue(struct fc_queue *queue,
         struct fc_queue_info *qinfo)
 {
diff --git a/src/fc_queue.h b/src/fc_queue.h
index e5ce71e..3be5e7e 100644
--- a/src/fc_queue.h
+++ b/src/fc_queue.h
@@ -93,6 +93,34 @@ static inline void fc_queue_push_queue_to_head(struct fc_queue *queue,
     }
 }
 
+static inline void fc_queue_push_queue_to_head_silence(
+        struct fc_queue *queue, struct fc_queue_info *qinfo)
+{
+    bool notify;
+    fc_queue_push_queue_to_head_ex(queue, qinfo, &notify);
+}
+
+void fc_queue_push_queue_to_tail_ex(struct fc_queue *queue,
+        struct fc_queue_info *qinfo, bool *notify);
+
+static inline void fc_queue_push_queue_to_tail(struct fc_queue *queue,
+        struct fc_queue_info *qinfo)
+{
+    bool notify;
+
+    fc_queue_push_queue_to_tail_ex(queue, qinfo, &notify);
+    if (notify) {
+        pthread_cond_signal(&(queue->lc_pair.cond));
+    }
+}
+
+static inline void fc_queue_push_queue_to_tail_silence(
+        struct fc_queue *queue, struct fc_queue_info *qinfo)
+{
+    bool notify;
+    fc_queue_push_queue_to_tail_ex(queue, qinfo, &notify);
+}
+
 void *fc_queue_pop_ex(struct fc_queue *queue, const bool blocked);
 #define fc_queue_pop(queue) fc_queue_pop_ex(queue, true)
 #define fc_queue_try_pop(queue) fc_queue_pop_ex(queue, false)