From: Ulrich Drepper <drepper@redhat.com>
Date: Thu, 14 Oct 1999 19:21:37 +0000 (+0000)
Subject: (__sleep): Optimize for zero seconds.
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ea4f32708f2098027e832746262d24b9f5c7db08;p=thirdparty%2Fglibc.git

(__sleep): Optimize for zero seconds.
---

diff --git a/sysdeps/unix/sysv/linux/sleep.c b/sysdeps/unix/sysv/linux/sleep.c
index 5fb11603cff..163f574da1b 100644
--- a/sysdeps/unix/sysv/linux/sleep.c
+++ b/sysdeps/unix/sysv/linux/sleep.c
@@ -1,5 +1,5 @@
 /* Implementation of the POSIX sleep function using nanosleep.
-   Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
+   Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
 
@@ -34,6 +34,10 @@ __sleep (unsigned int seconds)
   struct sigaction oact;
   unsigned int result;
 
+  /* This is not necessary but some buggy programs depend on this.  */
+  if (seconds == 0)
+    return 0;
+
   /* Linux will wake up the system call, nanosleep, when SIGCHLD
      arrives even if SIGCHLD is ignored.  We have to deal with it
      in libc.  We block SIGCHLD first.  */