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xz-archive/src/common/cpucores.h

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Cleanups to the code that detects the amount of RAM and the number of CPU cores. Added support for using sysinfo() on Linux systems whose libc lacks appropriate sysconf() support (at least dietlibc). The Autoconf macros were split into separate files, and CPU core count detection was moved from hardware.c to cpucores.h. The core count isn't used for anything real for now, so a problematic part in process.c was commented out.
2009-02-13 23:45:29 +01:00
///////////////////////////////////////////////////////////////////////////////
//
/// \file cpucores.h
/// \brief Get the number of online CPU cores
//
Put the interesting parts of XZ Utils into the public domain. Some minor documentation cleanups were made at the same time.
2009-04-13 10:27:40 +02:00
// Author: Lasse Collin
Cleanups to the code that detects the amount of RAM and the number of CPU cores. Added support for using sysinfo() on Linux systems whose libc lacks appropriate sysconf() support (at least dietlibc). The Autoconf macros were split into separate files, and CPU core count detection was moved from hardware.c to cpucores.h. The core count isn't used for anything real for now, so a problematic part in process.c was commented out.
2009-02-13 23:45:29 +01:00
//
Put the interesting parts of XZ Utils into the public domain. Some minor documentation cleanups were made at the same time.
2009-04-13 10:27:40 +02:00
// This file has been put into the public domain.
// You can do whatever you want with this file.
Cleanups to the code that detects the amount of RAM and the number of CPU cores. Added support for using sysinfo() on Linux systems whose libc lacks appropriate sysconf() support (at least dietlibc). The Autoconf macros were split into separate files, and CPU core count detection was moved from hardware.c to cpucores.h. The core count isn't used for anything real for now, so a problematic part in process.c was commented out.
2009-02-13 23:45:29 +01:00
//
///////////////////////////////////////////////////////////////////////////////
#ifndef CPUCORES_H
#define CPUCORES_H
Fix wrong macro names in lc_cpucores.m4 and cpucores.h. Thanks to Bert Wesarg.
2009-03-18 15:51:41 +01:00
#if defined(HAVE_CPUCORES_SYSCONF)
Cleanups to the code that detects the amount of RAM and the number of CPU cores. Added support for using sysinfo() on Linux systems whose libc lacks appropriate sysconf() support (at least dietlibc). The Autoconf macros were split into separate files, and CPU core count detection was moved from hardware.c to cpucores.h. The core count isn't used for anything real for now, so a problematic part in process.c was commented out.
2009-02-13 23:45:29 +01:00
# include <unistd.h>
Fix wrong macro names in lc_cpucores.m4 and cpucores.h. Thanks to Bert Wesarg.
2009-03-18 15:51:41 +01:00
#elif defined(HAVE_CPUCORES_SYSCTL)
Cleanups to the code that detects the amount of RAM and the number of CPU cores. Added support for using sysinfo() on Linux systems whose libc lacks appropriate sysconf() support (at least dietlibc). The Autoconf macros were split into separate files, and CPU core count detection was moved from hardware.c to cpucores.h. The core count isn't used for anything real for now, so a problematic part in process.c was commented out.
2009-02-13 23:45:29 +01:00
# ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
# endif
# ifdef HAVE_SYS_SYSCTL_H
# include <sys/sysctl.h>
# endif
#endif
static inline uint32_t
cpucores(void)
{
uint32_t ret = 0;
#if defined(HAVE_CPUCORES_SYSCONF)
const long cpus = sysconf(_SC_NPROCESSORS_ONLN);
if (cpus > 0)
ret = (uint32_t)(cpus);
#elif defined(HAVE_CPUCORES_SYSCTL)
int name[2] = { CTL_HW, HW_NCPU };
int cpus;
size_t cpus_size = sizeof(cpus);
if (!sysctl(name, &cpus, &cpus_size, NULL, NULL)
&& cpus_size == sizeof(cpus) && cpus > 0)
ret = (uint32_t)(cpus);
#endif
return ret;
}
#endif
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