[libc]优化usleep函数

dongly · mysterywolf · commit b9f5bf7d911b · 2023-03-30T00:41:13.000-04:00
diff --git a/components/libc/posix/delay/delay.c b/components/libc/posix/delay/delay.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2021, RT-Thread Development Team
+ * Copyright (c) 2006-2023, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -66,12 +66,12 @@ int usleep(useconds_t usec)
     if (rt_thread_self() != RT_NULL)
     {
         msleep(usec / 1000u);
+        udelay(usec % 1000u);
     }
     else  /* scheduler has not run yet */
     {
-        udelay(usec / 1000u * 1000u);
+        udelay(usec);
     }
-    udelay(usec % 1000u);
 
     return 0;
 }

Original file line number	Diff line number	Diff line change
`@@ -1,5 +1,5 @@`
`1`	`1`	`/*`
`2`		`- * Copyright (c) 2006-2021, RT-Thread Development Team`
	`2`	`+ * Copyright (c) 2006-2023, RT-Thread Development Team`
`3`	`3`	`*`
`4`	`4`	`* SPDX-License-Identifier: Apache-2.0`
`5`	`5`	`*`
`@@ -66,12 +66,12 @@ int usleep(useconds_t usec)`
`66`	`66`	`if (rt_thread_self() != RT_NULL)`
`67`	`67`	`{`
`68`	`68`	`msleep(usec / 1000u);`
	`69`	`+ udelay(usec % 1000u);`
`69`	`70`	`}`
`70`	`71`	`else /* scheduler has not run yet */`
`71`	`72`	`{`
`72`		`- udelay(usec / 1000u * 1000u);`
	`73`	`+ udelay(usec);`
`73`	`74`	`}`
`74`		`- udelay(usec % 1000u);`
`75`	`75`
`76`	`76`	`return 0;`
`77`	`77`	`}`