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/*
* affinity3.c
*
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2012 Pthreads-win32 contributors
*
* Homepage1: http://sourceware.org/pthreads-win32/
* Homepage2: http://sourceforge.net/projects/pthreads4w/
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* http://sources.redhat.com/pthreads-win32/contributors.html
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library in the file COPYING.LIB;
* if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*
* --------------------------------------------------------------------------
*
* Have the thread switch CPUs.
*
*/
#include "test.h"
int
main()
{
int result;
unsigned int cpu;
cpu_set_t newmask;
cpu_set_t processCpus;
cpu_set_t mask;
cpu_set_t switchmask;
cpu_set_t flipmask;
pthread_t self = pthread_self();
CPU_ZERO(&mask);
CPU_ZERO(&switchmask);
CPU_ZERO(&flipmask);
assert(pthread_getaffinity_np(self, sizeof(cpu_set_t), &processCpus) == 0);
printf("This thread has a starting affinity with %d CPUs\n", CPU_COUNT(&processCpus));
assert(!CPU_EQUAL(&mask, &processCpus));
for (cpu = 0; cpu < sizeof(cpu_set_t)*8; cpu += 2)
{
CPU_SET(cpu, &switchmask); /* 0b01010101010101010101010101010101 */
}
for (cpu = 0; cpu < sizeof(cpu_set_t)*8; cpu++)
{
CPU_SET(cpu, &flipmask); /* 0b11111111111111111111111111111111 */
}
result = pthread_setaffinity_np(self, sizeof(cpu_set_t), &processCpus);
if (result != 0)
{
assert(result != ESRCH);
assert(result != EFAULT);
assert(result != EPERM);
assert(result != EINVAL);
assert(result != EAGAIN);
assert(result == ENOSYS);
assert(CPU_COUNT(&mask) == 1);
}
else
{
if (CPU_COUNT(&mask) > 1)
{
CPU_AND(&newmask, &processCpus, &switchmask); /* Remove every other CPU */
assert(pthread_setaffinity_np(self, sizeof(cpu_set_t), &newmask) == 0);
assert(pthread_getaffinity_np(self, sizeof(cpu_set_t), &mask) == 0);
assert(CPU_EQUAL(&mask, &newmask));
CPU_XOR(&newmask, &mask, &flipmask); /* Switch to all alternative CPUs */
assert(!CPU_EQUAL(&mask, &newmask));
assert(pthread_setaffinity_np(self, sizeof(cpu_set_t), &newmask) == 0);
assert(pthread_getaffinity_np(self, sizeof(cpu_set_t), &mask) == 0);
assert(CPU_EQUAL(&mask, &newmask));
}
}
return 0;
}
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