mirror of https://git.tukaani.org/xz.git
52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
///////////////////////////////////////////////////////////////////////////////
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//
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/// \file cpucores.h
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/// \brief Get the number of online CPU cores
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//
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// Author: Lasse Collin
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//
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// This file has been put into the public domain.
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// You can do whatever you want with this file.
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//
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///////////////////////////////////////////////////////////////////////////////
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#ifndef CPUCORES_H
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#define CPUCORES_H
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#if defined(HAVE_CPUCORES_SYSCONF)
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# include <unistd.h>
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#elif defined(HAVE_CPUCORES_SYSCTL)
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# ifdef HAVE_SYS_PARAM_H
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# include <sys/param.h>
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# endif
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# ifdef HAVE_SYS_SYSCTL_H
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# include <sys/sysctl.h>
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# endif
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#endif
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static inline uint32_t
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cpucores(void)
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{
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uint32_t ret = 0;
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#if defined(HAVE_CPUCORES_SYSCONF)
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const long cpus = sysconf(_SC_NPROCESSORS_ONLN);
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if (cpus > 0)
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ret = (uint32_t)(cpus);
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#elif defined(HAVE_CPUCORES_SYSCTL)
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int name[2] = { CTL_HW, HW_NCPU };
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int cpus;
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size_t cpus_size = sizeof(cpus);
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if (!sysctl(name, &cpus, &cpus_size, NULL, NULL)
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&& cpus_size == sizeof(cpus) && cpus > 0)
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ret = (uint32_t)(cpus);
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#endif
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return ret;
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}
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#endif
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