Merge lp:~tangent-org/libmemcached/1.0-build/ Build: jenkins-Libmemcached-187
[m6w6/libmemcached] / libtest / cpu.cc
1 /* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
2 *
3 * Data Differential YATL (i.e. libtest) library
4 *
5 * Copyright (C) 2012 Data Differential, http://datadifferential.com/
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
9 * met:
10 *
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * * Redistributions in binary form must reproduce the above
15 * copyright notice, this list of conditions and the following disclaimer
16 * in the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * * The names of its contributors may not be used to endorse or
20 * promote products derived from this software without specific prior
21 * written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
27 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
29 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
33 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 *
35 */
36
37 #include "libtest/yatlcon.h"
38 #include <libtest/common.h>
39
40 #include <unistd.h>
41
42 #pragma GCC diagnostic ignored "-Wundef"
43
44 #if defined(HAVE_SYS_SYSCTL_H) && HAVE_SYS_SYSCTL_H
45 #include <sys/sysctl.h>
46 #endif
47
48 namespace libtest {
49
50 size_t number_of_cpus()
51 {
52 size_t number_of_cpu= 1;
53 #if defined(TARGET_OS_LINUX) && TARGET_OS_LINUX
54 number_of_cpu= sysconf(_SC_NPROCESSORS_ONLN);
55 #elif defined(HAVE_SYS_SYSCTL_H) && defined(CTL_HW) && defined(HW_NCPU) && defined(HW_AVAILCPU) && defined(HW_NCPU)
56 int mib[4];
57 size_t len= sizeof(number_of_cpu);
58
59 /* set the mib for hw.ncpu */
60 mib[0] = CTL_HW;
61 mib[1] = HW_AVAILCPU; // alternatively, try HW_NCPU;
62
63 /* get the number of CPUs from the system */
64 sysctl(mib, 2, &number_of_cpu, &len, NULL, 0);
65
66 if (number_of_cpu < 1)
67 {
68 mib[1]= HW_NCPU;
69 sysctl(mib, 2, &number_of_cpu, &len, NULL, 0 );
70
71 if (number_of_cpu < 1 )
72 {
73 number_of_cpu = 1;
74 }
75 }
76 #else
77 // Guessing number of CPU
78 #endif
79
80 return number_of_cpu;
81 }
82
83 } // namespace libtest