From b27c7e482648535760e012cd6f1afef1d800e2d2 Mon Sep 17 00:00:00 2001
From: bernard <bernard.xiong@rt-thread.com>
Date: Sun, 15 Oct 2017 22:31:53 +0800
Subject: [Kernel] Add signal implementation.

1. Add signal implementation;
2. Change the 'rt_uint8_t' of cmd to 'int';
---
 src/clock.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

(limited to 'src/clock.c')

diff --git a/src/clock.c b/src/clock.c
index 36e26238ed..734c0d5014 100644
--- a/src/clock.c
+++ b/src/clock.c
@@ -108,13 +108,23 @@ void rt_tick_increase(void)
  * This function will calculate the tick from millisecond.
  *
  * @param ms the specified millisecond
+ *           - Negative Number wait forever
+ *           - Zero not wait
+ *           - Max 0x7fffffff
  *
  * @return the calculated tick
  */
-rt_tick_t rt_tick_from_millisecond(rt_uint32_t ms)
+int rt_tick_from_millisecond(rt_int32_t ms)
 {
+    int tick;
+
+    if (ms < 0)
+        tick = RT_WAITING_FOREVER;
+    else
+        tick = (RT_TICK_PER_SECOND * ms + 999) / 1000;
+
     /* return the calculated tick */
-    return (RT_TICK_PER_SECOND * ms + 999) / 1000;
+    return tick;
 }
 RTM_EXPORT(rt_tick_from_millisecond);
 
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