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49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
/* Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/* get the number of (online) CPUs */
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#include "mysys_priv.h"
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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static int ncpus=0;
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int my_getncpus()
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{
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if (!ncpus)
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{
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#ifdef _SC_NPROCESSORS_ONLN
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ncpus= sysconf(_SC_NPROCESSORS_ONLN);
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#elif defined(__WIN__)
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SYSTEM_INFO sysinfo;
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/*
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* We are not calling GetNativeSystemInfo here because (1) we
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* don't believe that they return different values for number
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* of processors and (2) if WOW64 limits processors for Win32
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* then we don't want to try to override that.
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*/
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GetSystemInfo(&sysinfo);
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ncpus= sysinfo.dwNumberOfProcessors;
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#else
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/* unknown so play safe: assume SMP and forbid uniprocessor build */
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ncpus= 2;
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#endif
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}
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return ncpus;
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}
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