From: Marshall Clow <mclow@qualcomm.com>
Date: Thu, 7 Feb 2013 18:48:09 +0000 (+0000)
Subject: Belt and suspenders when calling sysconf
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0749262a1148a73d110885602b4d9e9017a3f04d;p=platform%2Fupstream%2Fllvm.git

Belt and suspenders when calling sysconf

llvm-svn: 174642
---

diff --git a/libcxx/src/thread.cpp b/libcxx/src/thread.cpp
index 184d81e..447eca7 100644
--- a/libcxx/src/thread.cpp
+++ b/libcxx/src/thread.cpp
@@ -69,7 +69,9 @@ thread::hardware_concurrency() _NOEXCEPT
     long result = sysconf(_SC_NPROCESSORS_ONLN);
     // sysconf returns -1 if the name is invalid, the option does not exist or
     // does not have a definite limit.
-    if (result == -1)
+    // if sysconf returns some other negative number, we have no idea
+    // what is going on. Default to something safe.
+    if (result < 0)
         return 0;
     return static_cast<unsigned>(result);
 #else  // defined(CTL_HW) && defined(HW_NCPU)