1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859 |
- /* Copyright (C) 2007 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C 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 2.1 of the License, or (at your option) any later version.
- The GNU C 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 the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
- #include <limits.h>
- #include <sched.h>
- int
- __sched_cpucount (size_t setsize, const cpu_set_t *setp)
- {
- int s = 0;
- const __cpu_mask *p = setp->__bits;
- const __cpu_mask *end = &setp->__bits[setsize / sizeof (__cpu_mask)];
- while (p < end)
- {
- __cpu_mask l = *p++;
- #ifdef POPCNT
- s += POPCNT (l);
- #else
- if (l == 0)
- continue;
- # if LONG_BIT > 32
- l = (l & 0x5555555555555555ul) + ((l >> 1) & 0x5555555555555555ul);
- l = (l & 0x3333333333333333ul) + ((l >> 2) & 0x3333333333333333ul);
- l = (l & 0x0f0f0f0f0f0f0f0ful) + ((l >> 4) & 0x0f0f0f0f0f0f0f0ful);
- l = (l & 0x00ff00ff00ff00fful) + ((l >> 8) & 0x00ff00ff00ff00fful);
- l = (l & 0x0000ffff0000fffful) + ((l >> 16) & 0x0000ffff0000fffful);
- l = (l & 0x00000000fffffffful) + ((l >> 32) & 0x00000000fffffffful);
- # else
- l = (l & 0x55555555ul) + ((l >> 1) & 0x55555555ul);
- l = (l & 0x33333333ul) + ((l >> 2) & 0x33333333ul);
- l = (l & 0x0f0f0f0ful) + ((l >> 4) & 0x0f0f0f0ful);
- l = (l & 0x00ff00fful) + ((l >> 8) & 0x00ff00fful);
- l = (l & 0x0000fffful) + ((l >> 16) & 0x0000fffful);
- # endif
- s += l;
- #endif
- }
- return s;
- }
|