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641ecb0753
This patch set implements the Linux syscalls sched_getaffinity, sched_setaffinity, pthread_getaffinity_np, and pthread_setaffinity_np. Linux has a straightforward view of the cpu sets used in affinity masks. They are simply long (1024-bit) bit masks. This code emulates that view while internally dealing with Windows' distribution of available CPUs among processor groups.
125 lines
3.0 KiB
C
125 lines
3.0 KiB
C
/*
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* Written by Joel Sherrill <joel@OARcorp.com>.
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*
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* COPYRIGHT (c) 1989-2010.
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* On-Line Applications Research Corporation (OAR).
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose without fee is hereby granted, provided that this entire notice
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* is included in all copies of any software which is or includes a copy
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* or modification of this software.
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*
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* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTY. IN PARTICULAR, THE AUTHOR MAKES NO REPRESENTATION
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* OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY OF THIS
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* SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
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*
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* $Id$
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*/
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#ifndef _SCHED_H_
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#define _SCHED_H_
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#include <sys/types.h>
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#include <sys/sched.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if defined(_POSIX_PRIORITY_SCHEDULING)
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/*
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* XBD 13 - Set Scheduling Parameters, P1003.1b-2008, p. 1803
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*/
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int sched_setparam(
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pid_t __pid,
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const struct sched_param *__param
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);
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/*
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* XBD 13 - Set Scheduling Parameters, P1003.1b-2008, p. 1800
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*/
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int sched_getparam(
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pid_t __pid,
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struct sched_param *__param
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);
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/*
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* XBD 13 - Set Scheduling Policy and Scheduling Parameters,
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* P1003.1b-2008, p. 1805
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*/
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int sched_setscheduler(
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pid_t __pid,
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int __policy,
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const struct sched_param *__param
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);
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/*
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* XBD 13 - Get Scheduling Policy, P1003.1b-2008, p. 1801
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*/
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int sched_getscheduler(
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pid_t __pid
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);
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/*
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* XBD 13 - Get Scheduling Parameter Limits, P1003.1b-2008, p. 1799
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*/
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int sched_get_priority_max(
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int __policy
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);
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int sched_get_priority_min(
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int __policy
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);
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/*
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* XBD 13 - Get Scheduling Parameter Limits, P1003.1b-2008, p. 1802
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*/
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int sched_rr_get_interval(
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pid_t __pid,
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struct timespec *__interval
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);
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#endif /* _POSIX_PRIORITY_SCHEDULING */
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#if defined(_POSIX_THREADS) || defined(_POSIX_PRIORITY_SCHEDULING)
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/*
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* XBD 13 - Yield Processor, P1003.1b-2008, p. 1807
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*/
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int sched_yield( void );
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#endif /* _POSIX_THREADS or _POSIX_PRIORITY_SCHEDULING */
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#if __GNU_VISIBLE
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int sched_getcpu(void);
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/* Affinity-related definitions, here until numerous enough to separate out */
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#ifdef __x86_64__
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typedef uint64_t __cpu_mask;
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#else
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typedef uint32_t __cpu_mask;
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#endif
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#define __CPU_SETSIZE 1024 // maximum number of logical processors tracked
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#define __NCPUBITS (8 * sizeof (__cpu_mask)) // max size of processor group
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#define __CPU_GROUPMAX (__CPU_SETSIZE / __NCPUBITS) // maximum group number
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#define __CPUELT(cpu) ((cpu) / __NCPUBITS)
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#define __CPUMASK(cpu) ((__cpu_mask) 1 << ((cpu) % __NCPUBITS))
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typedef struct
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{
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__cpu_mask __bits[__CPU_GROUPMAX];
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} cpu_set_t;
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int sched_getaffinity (pid_t, size_t, cpu_set_t *);
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int sched_get_thread_affinity (void *, size_t, cpu_set_t *);
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int sched_setaffinity (pid_t, size_t, const cpu_set_t *);
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int sched_set_thread_affinity (void *, size_t, const cpu_set_t *);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SCHED_H_ */
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