From 780d8dcb959ac71d7d0b1265761a9e2e3bdebb29 Mon Sep 17 00:00:00 2001
From: John Maddock <john@johnmaddock.co.uk>
Date: Thu, 18 Oct 2001 10:18:37 +0000
Subject: [PATCH] Updated BOOST_HAS_NANOSLEEP tests.

[SVN r11398]
---
 include/boost/config/platform/linux.hpp | 4 ++++
 include/boost/config/posix_features.hpp | 5 ++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/include/boost/config/platform/linux.hpp b/include/boost/config/platform/linux.hpp
index 1e2cc1f7..218cefbc 100644
--- a/include/boost/config/platform/linux.hpp
+++ b/include/boost/config/platform/linux.hpp
@@ -33,6 +33,10 @@
 #  define BOOST_HAS_GETTIMEOFDAY
 #endif
 
+#ifdef __USE_POSIX199309
+#  define BOOST_HAS_NANOSLEEP
+#endif
+
 #if defined(__GLIBC__) && defined(__GLIBC_PREREQ)
 // __GLIBC_PREREQ is available since 2.1.2
 
diff --git a/include/boost/config/posix_features.hpp b/include/boost/config/posix_features.hpp
index fc4271b4..8bd39e58 100644
--- a/include/boost/config/posix_features.hpp
+++ b/include/boost/config/posix_features.hpp
@@ -31,9 +31,12 @@
 #     endif
 
       // BOOST_HAS_NANOSLEEP:
-      // This is predicated on _POSIX_TIMERS:
+      // This is predicated on _POSIX_TIMERS or _XOPEN_REALTIME:
 #     if defined(_POSIX_TIMERS) && (_POSIX_TIMERS+0 >= 0)
 #        define BOOST_HAS_NANOSLEEP
+#     endif
+#     if defined(_XOPEN_REALTIME) && (_XOPEN_REALTIME+0 >= 0) && !defined(BOOST_HAS_NANOSLEEP)
+#        define BOOST_HAS_NANOSLEEP
 #     endif
 
       // BOOST_HAS_SCHED_YIELD: