61 строка
1.4 KiB
C
61 строка
1.4 KiB
C
/*
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* Copyright (c) 2007 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "opal_config.h"
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#include "opal/constants.h"
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#include "opal/util/num_procs.h"
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#if defined(HAVE_SYS_SYSCTL_H)
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#include <sys/sysctl.h>
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#endif
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/*
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* Simple wrapper to get the number of processors on the local host
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*/
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int opal_get_num_processors(int *num_procs)
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{
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#ifdef __WINDOWS__
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SYSTEM_INFO sys_info;
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GetSystemInfo( &sys_info );
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*num_procs = sys_info.dwNumberOfProcessors;
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return OPAL_SUCCESS;
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#else
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/* POSIX environments */
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#if defined(__APPLE__)
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/* OSX has a special function for this */
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size_t size = sizeof(*num_procs) ;
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if (0 == sysctlbyname( "hw.ncpu", num_procs, &size, NULL, 0)) {
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return OPAL_SUCCESS;
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}
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#elif OPAL_HAVE__SC_NPROCESSORS_ONLN
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/* Other POSIX'es can use sysconf() */
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int count = sysconf(_SC_NPROCESSORS_ONLN);
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if (-1 != count) {
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*num_procs = count;
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return OPAL_SUCCESS;
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}
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#endif
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/* Default case if we don't know how to get the processor number or if
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something fails. */
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return OPAL_ERR_NOT_FOUND;
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#endif
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}
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