Belt and suspenders when calling sysconf
llvm-svn: 174642
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@ -69,7 +69,9 @@ thread::hardware_concurrency() _NOEXCEPT
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long result = sysconf(_SC_NPROCESSORS_ONLN);
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long result = sysconf(_SC_NPROCESSORS_ONLN);
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// sysconf returns -1 if the name is invalid, the option does not exist or
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// sysconf returns -1 if the name is invalid, the option does not exist or
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// does not have a definite limit.
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// does not have a definite limit.
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if (result == -1)
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// if sysconf returns some other negative number, we have no idea
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// what is going on. Default to something safe.
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if (result < 0)
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return 0;
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return 0;
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return static_cast<unsigned>(result);
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return static_cast<unsigned>(result);
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#else // defined(CTL_HW) && defined(HW_NCPU)
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#else // defined(CTL_HW) && defined(HW_NCPU)
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