Merge pull request #1579 from RT-Thread/fix_waitqueue

Fix waitqueue issue

1 files changed, 40 insertions, 6 deletions

diff --git a/components/drivers/include/ipc/waitqueue.h b/components/drivers/include/ipc/waitqueue.h
index 1746d0f1cd..8cb0989f73 100644
--- a/components/drivers/include/ipc/waitqueue.h
+++ b/components/drivers/include/ipc/waitqueue.h
@@ -1,25 +1,59 @@
+/*
+ * File      : waitqueue.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018/06/26     Bernard      Fix the wait queue issue when wakeup a soon 
+ *                             to blocked thread.
+ */
+
 #ifndef WAITQUEUE_H__
 #define WAITQUEUE_H__
 
 #include <rtthread.h>
 
-struct rt_wqueue_node;
+#define RT_WQ_FLAG_CLEAN    0x00
+#define RT_WQ_FLAG_WAKEUP   0x01
 
-typedef rt_list_t rt_wqueue_t;
+struct rt_wqueue_node;
 typedef int (*rt_wqueue_func_t)(struct rt_wqueue_node *wait, void *key);
 
 struct rt_wqueue_node
 {
-	rt_thread_t polling_thread;
-	rt_list_t   list;
+    rt_thread_t polling_thread;
+    rt_list_t   list;
 
-	rt_wqueue_func_t wakeup;
-	rt_uint32_t key;
+    rt_wqueue_func_t wakeup;
+    rt_uint32_t key;
 };
 typedef struct rt_wqueue_node rt_wqueue_node_t;
 
 int __wqueue_default_wake(struct rt_wqueue_node *wait, void *key);
 
+rt_inline void rt_wqueue_init(rt_wqueue_t *queue)
+{
+    RT_ASSERT(queue != RT_NULL);
+
+    queue->flag = RT_WQ_FLAG_CLEAN;
+    rt_list_init(&(queue->waiting_list));
+}
+
 void rt_wqueue_add(rt_wqueue_t *queue, struct rt_wqueue_node *node);
 void rt_wqueue_remove(struct rt_wqueue_node *node);
 int  rt_wqueue_wait(rt_wqueue_t *queue, int condition, int timeout);