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8a67a4b343
[BZ #15448] * sysdeps/unix/sysv/linux/bits/sched.h (__CPU_SET_S) (__CPU_CLR_S, __CPU_ISSET_S): Avoid integer overflow.
211 lines
7.3 KiB
C
211 lines
7.3 KiB
C
/* Definitions of constants and data structure for POSIX 1003.1b-1993
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scheduling interface.
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Copyright (C) 1996-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef __need_schedparam
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#ifndef _SCHED_H
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# error "Never include <bits/sched.h> directly; use <sched.h> instead."
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#endif
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/* Scheduling algorithms. */
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#define SCHED_OTHER 0
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#define SCHED_FIFO 1
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#define SCHED_RR 2
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#ifdef __USE_GNU
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# define SCHED_BATCH 3
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# define SCHED_IDLE 5
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# define SCHED_RESET_ON_FORK 0x40000000
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#endif
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#ifdef __USE_GNU
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/* Cloning flags. */
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# define CSIGNAL 0x000000ff /* Signal mask to be sent at exit. */
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# define CLONE_VM 0x00000100 /* Set if VM shared between processes. */
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# define CLONE_FS 0x00000200 /* Set if fs info shared between processes. */
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# define CLONE_FILES 0x00000400 /* Set if open files shared between processes. */
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# define CLONE_SIGHAND 0x00000800 /* Set if signal handlers shared. */
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# define CLONE_PTRACE 0x00002000 /* Set if tracing continues on the child. */
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# define CLONE_VFORK 0x00004000 /* Set if the parent wants the child to
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wake it up on mm_release. */
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# define CLONE_PARENT 0x00008000 /* Set if we want to have the same
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parent as the cloner. */
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# define CLONE_THREAD 0x00010000 /* Set to add to same thread group. */
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# define CLONE_NEWNS 0x00020000 /* Set to create new namespace. */
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# define CLONE_SYSVSEM 0x00040000 /* Set to shared SVID SEM_UNDO semantics. */
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# define CLONE_SETTLS 0x00080000 /* Set TLS info. */
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# define CLONE_PARENT_SETTID 0x00100000 /* Store TID in userlevel buffer
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before MM copy. */
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# define CLONE_CHILD_CLEARTID 0x00200000 /* Register exit futex and memory
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location to clear. */
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# define CLONE_DETACHED 0x00400000 /* Create clone detached. */
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# define CLONE_UNTRACED 0x00800000 /* Set if the tracing process can't
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force CLONE_PTRACE on this clone. */
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# define CLONE_CHILD_SETTID 0x01000000 /* Store TID in userlevel buffer in
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the child. */
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# define CLONE_NEWUTS 0x04000000 /* New utsname group. */
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# define CLONE_NEWIPC 0x08000000 /* New ipcs. */
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# define CLONE_NEWUSER 0x10000000 /* New user namespace. */
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# define CLONE_NEWPID 0x20000000 /* New pid namespace. */
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# define CLONE_NEWNET 0x40000000 /* New network namespace. */
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# define CLONE_IO 0x80000000 /* Clone I/O context. */
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#endif
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/* The official definition. */
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struct sched_param
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{
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int __sched_priority;
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};
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__BEGIN_DECLS
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#ifdef __USE_GNU
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/* Clone current process. */
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extern int clone (int (*__fn) (void *__arg), void *__child_stack,
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int __flags, void *__arg, ...) __THROW;
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/* Unshare the specified resources. */
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extern int unshare (int __flags) __THROW;
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/* Get index of currently used CPU. */
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extern int sched_getcpu (void) __THROW;
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/* Switch process to namespace of type NSTYPE indicated by FD. */
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extern int setns (int __fd, int __nstype) __THROW;
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#endif
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__END_DECLS
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#endif /* need schedparam */
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#if !defined __defined_schedparam \
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&& (defined __need_schedparam || defined _SCHED_H)
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# define __defined_schedparam 1
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/* Data structure to describe a process' schedulability. */
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struct __sched_param
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{
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int __sched_priority;
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};
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# undef __need_schedparam
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#endif
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#if defined _SCHED_H && !defined __cpu_set_t_defined
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# define __cpu_set_t_defined
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/* Size definition for CPU sets. */
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# define __CPU_SETSIZE 1024
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# define __NCPUBITS (8 * sizeof (__cpu_mask))
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/* Type for array elements in 'cpu_set_t'. */
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typedef unsigned long int __cpu_mask;
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/* Basic access functions. */
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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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/* Data structure to describe CPU mask. */
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typedef struct
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{
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__cpu_mask __bits[__CPU_SETSIZE / __NCPUBITS];
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} cpu_set_t;
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/* Access functions for CPU masks. */
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# if __GNUC_PREREQ (2, 91)
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# define __CPU_ZERO_S(setsize, cpusetp) \
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do __builtin_memset (cpusetp, '\0', setsize); while (0)
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# else
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# define __CPU_ZERO_S(setsize, cpusetp) \
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do { \
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size_t __i; \
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size_t __imax = (setsize) / sizeof (__cpu_mask); \
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__cpu_mask *__bits = (cpusetp)->__bits; \
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for (__i = 0; __i < __imax; ++__i) \
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__bits[__i] = 0; \
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} while (0)
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# endif
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# define __CPU_SET_S(cpu, setsize, cpusetp) \
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(__extension__ \
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({ size_t __cpu = (cpu); \
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__cpu / 8 < (setsize) \
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? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \
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|= __CPUMASK (__cpu)) \
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: 0; }))
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# define __CPU_CLR_S(cpu, setsize, cpusetp) \
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(__extension__ \
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({ size_t __cpu = (cpu); \
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__cpu / 8 < (setsize) \
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? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \
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&= ~__CPUMASK (__cpu)) \
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: 0; }))
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# define __CPU_ISSET_S(cpu, setsize, cpusetp) \
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(__extension__ \
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({ size_t __cpu = (cpu); \
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__cpu / 8 < (setsize) \
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? ((((const __cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \
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& __CPUMASK (__cpu))) != 0 \
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: 0; }))
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# define __CPU_COUNT_S(setsize, cpusetp) \
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__sched_cpucount (setsize, cpusetp)
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# if __GNUC_PREREQ (2, 91)
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# define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
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(__builtin_memcmp (cpusetp1, cpusetp2, setsize) == 0)
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# else
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# define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
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(__extension__ \
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({ const __cpu_mask *__arr1 = (cpusetp1)->__bits; \
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const __cpu_mask *__arr2 = (cpusetp2)->__bits; \
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size_t __imax = (setsize) / sizeof (__cpu_mask); \
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size_t __i; \
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for (__i = 0; __i < __imax; ++__i) \
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if (__arr1[__i] != __arr2[__i]) \
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break; \
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__i == __imax; }))
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# endif
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# define __CPU_OP_S(setsize, destset, srcset1, srcset2, op) \
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(__extension__ \
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({ cpu_set_t *__dest = (destset); \
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const __cpu_mask *__arr1 = (srcset1)->__bits; \
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const __cpu_mask *__arr2 = (srcset2)->__bits; \
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size_t __imax = (setsize) / sizeof (__cpu_mask); \
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size_t __i; \
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for (__i = 0; __i < __imax; ++__i) \
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((__cpu_mask *) __dest->__bits)[__i] = __arr1[__i] op __arr2[__i]; \
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__dest; }))
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# define __CPU_ALLOC_SIZE(count) \
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((((count) + __NCPUBITS - 1) / __NCPUBITS) * sizeof (__cpu_mask))
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# define __CPU_ALLOC(count) __sched_cpualloc (count)
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# define __CPU_FREE(cpuset) __sched_cpufree (cpuset)
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__BEGIN_DECLS
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extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp)
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__THROW;
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extern cpu_set_t *__sched_cpualloc (size_t __count) __THROW __wur;
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extern void __sched_cpufree (cpu_set_t *__set) __THROW;
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__END_DECLS
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#endif
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