add function fc_queue_timedpeek

HISTORY

@@ -1,7 +1,8 @@
 
-Version 1.54  2021-08-08
+Version 1.54  2021-08-11
   * fast_allocator.[hc]: correct reclaim_interval logic
   * shared_func.[hc]: add functions getFileContentEx1 and getFileContent1
+  * fc_queue.[hc]: add function fc_queue_timedpeek
 
 Version 1.53  2021-06-30
   * process_action support action status

src/fc_queue.c

@@ -181,7 +181,6 @@ void *fc_queue_timedpop(struct fc_queue *queue,
 	void *data;
 
     PTHREAD_MUTEX_LOCK(&queue->lc_pair.lock);
-    do {
     data = queue->head;
     if (data == NULL) {
         fc_cond_timedwait(&queue->lc_pair, timeout, time_unit);
@@ -194,8 +193,23 @@ void *fc_queue_timedpop(struct fc_queue *queue,
             queue->tail = NULL;
         }
     }
-    } while (0);
-
     PTHREAD_MUTEX_UNLOCK(&queue->lc_pair.lock);
+
+	return data;
+}
+
+void *fc_queue_timedpeek(struct fc_queue *queue,
+        const int timeout, const int time_unit)
+{
+    void *data;
+
+    PTHREAD_MUTEX_LOCK(&queue->lc_pair.lock);
+    data = queue->head;
+    if (data == NULL) {
+        fc_cond_timedwait(&queue->lc_pair, timeout, time_unit);
+        data = queue->head;
+    }
+    PTHREAD_MUTEX_UNLOCK(&queue->lc_pair.lock);
+
     return data;
 }

src/fc_queue.h

@@ -160,6 +160,18 @@ void *fc_queue_timedpop(struct fc_queue *queue,
 #define fc_queue_timedpop_us(queue, timeout_us) \
     fc_queue_timedpop(queue, timeout_us, FC_TIME_UNIT_USECOND)
 
+void *fc_queue_timedpeek(struct fc_queue *queue,
+        const int timeout, const int time_unit);
+
+#define fc_queue_timedpeek_sec(queue, timeout) \
+    fc_queue_timedpeek(queue, timeout, FC_TIME_UNIT_SECOND)
+
+#define fc_queue_timedpeek_ms(queue, timeout_ms) \
+    fc_queue_timedpeek(queue, timeout_ms, FC_TIME_UNIT_MSECOND)
+
+#define fc_queue_timedpeek_us(queue, timeout_us) \
+    fc_queue_timedpeek(queue, timeout_us, FC_TIME_UNIT_USECOND)
+
 #ifdef __cplusplus
 }
 #endif