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Belt and suspenders when calling sysconf

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@174642 91177308-0d34-0410-b5e6-96231b3b80d8
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Marshall Clow 2013-02-07 18:48:09 +00:00
parent d854ce6bfa
commit b18165e704
1 changed files with 3 additions and 1 deletions
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4
src/thread.cpp
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@ -69,7 +69,9 @@ thread::hardware_concurrency() _NOEXCEPT
long result = sysconf(_SC_NPROCESSORS_ONLN); long result = sysconf(_SC_NPROCESSORS_ONLN);
// sysconf returns -1 if the name is invalid, the option does not exist or // sysconf returns -1 if the name is invalid, the option does not exist or
// does not have a definite limit. // 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 0;
return static_cast<unsigned>(result); return static_cast<unsigned>(result);
#else // defined(CTL_HW) && defined(HW_NCPU) #else // defined(CTL_HW) && defined(HW_NCPU)