use nanosleep instead of usleep, ugaX11 calls msSleep instead of usleep

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2376 6f19259b-4bc3-4df7-8a09-765794883524

EdkUnixPkg/Sec/UnixThunk.c

@@ -89,6 +89,18 @@ SetTimer (UINT64 PeriodMs, VOID (*CallBack)(UINT64 DeltaMs))
   settimer_callback = CallBack;
 }
 
+void
+msSleep (unsigned long Milliseconds)
+{
+  struct timespec ts;
+
+  ts.tv_sec = Milliseconds / 1000;
+  ts.tv_nsec = (Milliseconds % 1000) * 1000000;
+
+  while (nanosleep (&ts, &ts) != 0 && errno == EINTR)
+    ;
+}
+
 void
 GetLocalTime (EFI_TIME *Time)
 {
@@ -110,12 +122,6 @@ GetLocalTime (EFI_TIME *Time)
     | (tm->tm_isdst > 0 ? EFI_TIME_IN_DAYLIGHT : 0);
 }
 
-void
-msSleep (unsigned long Milliseconds)
-{
-  usleep (Milliseconds * 1000);
-}
-
 static void
 TzSet (void)
 {