From 6697fa0ff54219b6d0b4f65dd28cdcdd22e0158c Mon Sep 17 00:00:00 2001
From: Meco Man <920369182@qq.com>
Date: Wed, 16 Jun 2021 12:15:24 +0800
Subject: [sleep] 加入调度器尚未运行时的延时情况
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---
 components/libc/compilers/common/unistd.c | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

(limited to 'components')

diff --git a/components/libc/compilers/common/unistd.c b/components/libc/compilers/common/unistd.c
index 4385643f31..9a457c4200 100644
--- a/components/libc/compilers/common/unistd.c
+++ b/components/libc/compilers/common/unistd.c
@@ -37,19 +37,26 @@ RTM_EXPORT(isatty);
 
 char *ttyname(int fd)
 {
-    return "/dev/tty"; /*TODO: need to add more specific*/
+    return "/dev/tty"; /* TODO: need to add more specific */
 }
 RTM_EXPORT(ttyname);
 
 unsigned int sleep(unsigned int seconds)
 {
-    rt_tick_t delta_tick;
-
-    delta_tick = rt_tick_get();
-    rt_thread_delay(seconds * RT_TICK_PER_SECOND);
-    delta_tick = rt_tick_get() - delta_tick;
+    if (rt_thread_self() != RT_NULL)
+    {
+        rt_thread_delay(seconds * RT_TICK_PER_SECOND);
+    }
+    else /* scheduler has not run yet */
+    {
+        while(seconds > 0)
+        {
+            rt_hw_us_delay(1000000u);
+            seconds --;
+        }
+    }
 
-    return seconds - delta_tick/RT_TICK_PER_SECOND;
+    return 0;
 }
 RTM_EXPORT(sleep);
 
@@ -59,11 +66,12 @@ int usleep(useconds_t usec)
     {
         rt_thread_mdelay(usec / 1000u);
     }
-    else
+    else  /* scheduler has not run yet */
     {
         rt_hw_us_delay(usec / 1000u);
     }
     rt_hw_us_delay(usec % 1000u);
+
     return 0;
 }
 RTM_EXPORT(usleep);
-- 
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