add RT_USING_POSIX_DELAY

components/libc/Kconfig

@@ -53,6 +53,10 @@ if RT_USING_POSIX
         select RT_USING_POSIX_POLL
         default n
 
+    config RT_USING_POSIX_DELAY
+        bool "Enable delay functions"
+        default n
+
     config RT_USING_POSIX_GETLINE
         bool "Enable getline()/getdelim() APIs"
         default n

components/libc/posix/src/SConscript

@@ -1,7 +1,8 @@
+# RT-Thread building script for component
+
 from building import *
-Import('rtconfig')
 
-src     = ['libc.c','delay.c','unistd.c']
+src     = ['libc.c', 'unistd.c']
 cwd     = GetCurrentDir()
 CPPPATH = [cwd]
 
@@ -11,6 +12,9 @@ if GetDepend('RT_USING_POSIX_POLL'):
 if GetDepend('RT_USING_POSIX_SELECT'):
     src += ['select.c']
 
+if GetDepend('RT_USING_POSIX_DELAY'):
+    src += ['delay.c']
+
 group = DefineGroup('POSIX', src, depend = ['RT_USING_POSIX'], CPPPATH = CPPPATH)
 
 Return('group')

components/libc/posix/src/delay.c

@@ -48,3 +48,38 @@ void ndelay(unsigned long nsecs)
     rt_hw_us_delay(1);
 }
 RTM_EXPORT(ndelay);
+
+unsigned int sleep(unsigned int seconds)
+{
+    if (rt_thread_self() != RT_NULL)
+    {
+        ssleep(seconds);
+    }
+    else /* scheduler has not run yet */
+    {
+        while(seconds > 0)
+        {
+            udelay(1000000u);
+            seconds --;
+        }
+    }
+
+    return 0;
+}
+RTM_EXPORT(sleep);
+
+int usleep(useconds_t usec)
+{
+    if (rt_thread_self() != RT_NULL)
+    {
+        msleep(usec / 1000u);
+    }
+    else  /* scheduler has not run yet */
+    {
+        udelay(usec / 1000u);
+    }
+    udelay(usec % 1000u);
+
+    return 0;
+}
+RTM_EXPORT(usleep);

components/libc/posix/src/unistd.c

@@ -965,38 +965,3 @@ char *ttyname(int fd)
     return "/dev/tty"; /* TODO: need to add more specific */
 }
 RTM_EXPORT(ttyname);
-
-unsigned int sleep(unsigned int seconds)
-{
-    if (rt_thread_self() != RT_NULL)
-    {
-        ssleep(seconds);
-    }
-    else /* scheduler has not run yet */
-    {
-        while(seconds > 0)
-        {
-            udelay(1000000u);
-            seconds --;
-        }
-    }
-
-    return 0;
-}
-RTM_EXPORT(sleep);
-
-int usleep(useconds_t usec)
-{
-    if (rt_thread_self() != RT_NULL)
-    {
-        msleep(usec / 1000u);
-    }
-    else  /* scheduler has not run yet */
-    {
-        udelay(usec / 1000u);
-    }
-    udelay(usec % 1000u);
-
-    return 0;
-}
-RTM_EXPORT(usleep);