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bits/sched.h has logic to expose only an impl-namespace variant of struct sched_param (i.e. struct __sched_param), but nothing uses it, and the only header that includes bits/sched.h is sched.h. The __need_schedparam logic can therefore be removed. bits/sched.h also has a great deal of code relating to cpu_set_t objects that was *almost* the same between the two versions of bits/sched.h in the tree; a little spelunking indicated that this is because some bug fixes got applied to the Linux-specific bits/sched.h but not the generic one. Introduce a new header, bits/cpu-set.h, containing the version of that code with the bugfixes, have sched.h include it directly, and delete all of the code from both versions of bits/sched.h. Also remove the unnecessary name mangling in the definition of struct sched_param -- POSIX specifies a field 'sched_priority', so there is no reason to define it as '__sched_priority' and then paper over that with a macro. (Just in case someone was using the internal name, 'sched_priority' remains a macro defined to expand to itself, and '__sched_priority' now expands to 'sched_priority'.) Finally, as long as I'm touching these files anyway, merge new constants from linux/sched.h into the Linux bits/sched.h. * bits/sched.h: Remove __need_schedparam logic and replace with a normal multiple-include guard. Change field name in struct sched_param from __sched_priority to sched_priority. Delete everything under #ifndef __cpu_set_t_defined. * sysdeps/unix/sysv/linux/bits/sched.h: Likewise. Also sync with kernel sched.h, adding SCHED_ISO and SCHED_DEADLINE constants. * posix/sched.h: Include bits/cpu-set.h as well as bits/sched.h. For compatibility, #define sched_priority to itself, and #define __sched_priority as sched_priority. * posix/bits/cpu-set.h: New file containing, verbatim, the code that was under #ifndef __cpu_set_t_defined in sysdeps/unix/sysv/linux/bits/sched.h. * include/bits/cpu-set.h: New wrapper. * posix/Makefile: Install bits/cpu-set.h.
100 lines
3.7 KiB
C
100 lines
3.7 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) 1996-2017 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 _BITS_SCHED_H
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#define _BITS_SCHED_H 1
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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_ISO 4
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# define SCHED_IDLE 5
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# define SCHED_DEADLINE 6
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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_NEWCGROUP 0x02000000 /* New cgroup namespace. */
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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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/* 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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__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 /* bits/sched.h */
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