3013-11-19 Jennifer Averett <jennifer.averett@oarcorp.com>
* libc/sys/rtems/sys/cpuset.h: New file.
This commit is contained in:
Joel Sherrill
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3013-11-19 Jennifer Averett <jennifer.averett@oarcorp.com>
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* libc/sys/rtems/sys/cpuset.h: New file.
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2013-11-19 Joel Sherrill <joel.sherrill@oarcorp.com>
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* libc/include/stdlib.h: Add prototype of realpath().
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207
newlib/libc/sys/rtems/sys/cpuset.h
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207
newlib/libc/sys/rtems/sys/cpuset.h
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/*
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* Copyright (c) 2013 On-Line Applications Research Corporation.
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* All rights reserved.
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*
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* On-Line Applications Research Corporation
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* 7047 Old Madison Pike Suite 320
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* Huntsville Alabama 35806
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* <info@oarcorp.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* This file implements an API compatible with static portion of
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* the GNU/Linux cpu_set_t macros but is independently implemented.
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* The GNU/Linux manual page and the FreeBSD cpuset_t implementation
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* were used as reference material.
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*
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* Not implemented:
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* + Linux CPU_XXX_S
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* + FreeBSD CPU_SUBSET
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* + FreeBSD CPU_OVERLAP
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*/
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#ifndef _SYS_CPUSET_H_
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#define _SYS_CPUSET_H_
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#if 0
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#include <sys/types.h>
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#endif
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#include <stdint.h>
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/* RTEMS supports a maximum of 32 CPU cores */
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#ifndef CPU_SETSIZE
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#define CPU_SETSIZE 32
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#endif
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/* word in the cpu set */
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typedef uint32_t cpu_set_word_t;
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/* Number of bits per cpu_set_t element */
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#define _NCPUBITS (sizeof(cpu_set_word_t) * NBBY) /* bits per mask */
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/* Number of words in the cpu_set_t array */
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/* NOTE: Can't use howmany() because of circular dependency */
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#define _NCPUWORDS (((CPU_SETSIZE)+((_NCPUBITS)-1))/(_NCPUBITS))
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/* Define the cpu set structure */
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typedef struct _cpuset {
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cpu_set_word_t __bits[_NCPUWORDS];
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} cpu_set_t;
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/* determine the mask for a particular cpu within the element */
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static inline cpu_set_word_t __cpuset_mask( size_t cpu )
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{
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return ((cpu_set_word_t)1 << ((cpu) % _NCPUBITS));
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}
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/* determine the index for this cpu within the cpu set array */
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static inline size_t __cpuset_index( size_t cpu )
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{
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return ((cpu)/_NCPUBITS);
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}
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/* zero out set */
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static inline void CPU_ZERO( cpu_set_t *set )
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{
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size_t i;
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for (i = 0; i < _NCPUWORDS; i++)
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set->__bits[i] = 0;
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}
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/* fill set */
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static inline void CPU_FILL( cpu_set_t *set )
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{
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size_t i;
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for (i = 0; i < _NCPUWORDS; i++)
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set->__bits[i] = -1;
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}
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/* set cpu within set */
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static inline void CPU_SET( size_t cpu, cpu_set_t *set )
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{
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set->__bits[__cpuset_index(cpu)] |= __cpuset_mask(cpu);
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}
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/* clear cpu within set */
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static inline void CPU_CLR( size_t cpu, cpu_set_t *set )
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{
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set->__bits[__cpuset_index(cpu)] &= ~__cpuset_mask(cpu);
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}
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/* Return 1 is cpu is set in set, 0 otherwise */
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static inline int const CPU_ISSET( size_t cpu, const cpu_set_t *set )
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{
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return ((set->__bits[__cpuset_index(cpu)] & __cpuset_mask(cpu)) != 0);
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}
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/* copy src set to dest set */
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static inline void CPU_COPY( cpu_set_t *dest, const cpu_set_t *src )
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{
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*dest = *src;
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}
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/* logical and: dest set = src1 set and src2 set */
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static inline void CPU_AND(
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cpu_set_t *dest, const cpu_set_t *src1, const cpu_set_t *src2
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)
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{
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size_t i;
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for (i = 0; i < _NCPUWORDS; i++)
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dest->__bits[i] = src1->__bits[i] & src2->__bits[i];
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}
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/* logical or: dest set = src1 set or src2 set */
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static inline void CPU_OR(
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cpu_set_t *dest, const cpu_set_t *src1, const cpu_set_t *src2
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)
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{
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size_t i;
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for (i = 0; i < _NCPUWORDS; i++)
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dest->__bits[i] = src1->__bits[i] | src2->__bits[i];
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}
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/* logical xor: dest set = src1 set xor src2 set */
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static inline void CPU_XOR(
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cpu_set_t *dest, const cpu_set_t *src1, const cpu_set_t *src2
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)
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{
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size_t i;
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for (i = 0; i < _NCPUWORDS; i++)
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dest->__bits[i] = src1->__bits[i] ^ src2->__bits[i];
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}
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/* logical nand: dest set = src1 set nand src2 set */
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static inline void CPU_NAND(
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cpu_set_t *dest, const cpu_set_t *src1, const cpu_set_t *src2
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)
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{
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size_t i;
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for (i = 0; i < _NCPUWORDS; i++)
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dest->__bits[i] = ~(src1->__bits[i] & src2->__bits[i]);
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}
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/* return the number of set cpus in set */
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static inline int const CPU_COUNT( const cpu_set_t *set )
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{
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size_t i;
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int count = 0;
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for (i=0; i < _NCPUWORDS; i++)
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if (CPU_ISSET(i, set) != 0)
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count++;
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return count;
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}
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/* return 1 if the sets set1 and set2 are equal, otherwise return 0 */
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static inline int const CPU_EQUAL(
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const cpu_set_t *set1, const cpu_set_t *set2
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)
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{
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size_t i;
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for (i=0; i < _NCPUWORDS; i++)
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if (set1->__bits[i] != set2->__bits[i] )
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return 0;
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return 1;
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}
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/* return 1 if the sets set1 and set2 are equal, otherwise return 0 */
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static inline int const CPU_CMP( const cpu_set_t *set1, const cpu_set_t *set2 )
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{
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return CPU_EQUAL(set1, set2);
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}
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/* return 1 if the set is empty, otherwise return 0 */
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static inline int const CPU_EMPTY( const cpu_set_t *set )
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{
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size_t i;
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for (i=0; i < _NCPUWORDS; i++)
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if (set->__bits[i] != 0 )
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return 0;
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return 1;
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}
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#endif
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