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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.
132 lines
4.6 KiB
C
132 lines
4.6 KiB
C
/* Definitions for POSIX 1003.1b-1993 (aka POSIX.4) 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 _SCHED_H
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#define _SCHED_H 1
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#include <features.h>
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/* Get type definitions. */
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#include <bits/types.h>
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#define __need_size_t
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#define __need_NULL
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#include <stddef.h>
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#include <bits/types/time_t.h>
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#include <bits/types/struct_timespec.h>
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#ifndef __USE_XOPEN2K
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# include <time.h>
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#endif
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#ifndef __pid_t_defined
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typedef __pid_t pid_t;
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# define __pid_t_defined
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#endif
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/* Get system specific constant and data structure definitions. */
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#include <bits/sched.h>
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#include <bits/cpu-set.h>
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/* Backward compatibility. */
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#define sched_priority sched_priority
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#define __sched_priority sched_priority
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__BEGIN_DECLS
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/* Set scheduling parameters for a process. */
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extern int sched_setparam (__pid_t __pid, const struct sched_param *__param)
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__THROW;
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/* Retrieve scheduling parameters for a particular process. */
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extern int sched_getparam (__pid_t __pid, struct sched_param *__param) __THROW;
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/* Set scheduling algorithm and/or parameters for a process. */
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extern int sched_setscheduler (__pid_t __pid, int __policy,
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const struct sched_param *__param) __THROW;
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/* Retrieve scheduling algorithm for a particular purpose. */
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extern int sched_getscheduler (__pid_t __pid) __THROW;
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/* Yield the processor. */
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extern int sched_yield (void) __THROW;
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/* Get maximum priority value for a scheduler. */
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extern int sched_get_priority_max (int __algorithm) __THROW;
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/* Get minimum priority value for a scheduler. */
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extern int sched_get_priority_min (int __algorithm) __THROW;
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/* Get the SCHED_RR interval for the named process. */
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extern int sched_rr_get_interval (__pid_t __pid, struct timespec *__t) __THROW;
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#ifdef __USE_GNU
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/* Access macros for `cpu_set'. */
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# define CPU_SETSIZE __CPU_SETSIZE
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# define CPU_SET(cpu, cpusetp) __CPU_SET_S (cpu, sizeof (cpu_set_t), cpusetp)
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# define CPU_CLR(cpu, cpusetp) __CPU_CLR_S (cpu, sizeof (cpu_set_t), cpusetp)
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# define CPU_ISSET(cpu, cpusetp) __CPU_ISSET_S (cpu, sizeof (cpu_set_t), \
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cpusetp)
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# define CPU_ZERO(cpusetp) __CPU_ZERO_S (sizeof (cpu_set_t), cpusetp)
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# define CPU_COUNT(cpusetp) __CPU_COUNT_S (sizeof (cpu_set_t), cpusetp)
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# define CPU_SET_S(cpu, setsize, cpusetp) __CPU_SET_S (cpu, setsize, cpusetp)
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# define CPU_CLR_S(cpu, setsize, cpusetp) __CPU_CLR_S (cpu, setsize, cpusetp)
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# define CPU_ISSET_S(cpu, setsize, cpusetp) __CPU_ISSET_S (cpu, setsize, \
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cpusetp)
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# define CPU_ZERO_S(setsize, cpusetp) __CPU_ZERO_S (setsize, cpusetp)
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# define CPU_COUNT_S(setsize, cpusetp) __CPU_COUNT_S (setsize, cpusetp)
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# define CPU_EQUAL(cpusetp1, cpusetp2) \
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__CPU_EQUAL_S (sizeof (cpu_set_t), cpusetp1, cpusetp2)
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# define CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
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__CPU_EQUAL_S (setsize, cpusetp1, cpusetp2)
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# define CPU_AND(destset, srcset1, srcset2) \
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__CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, &)
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# define CPU_OR(destset, srcset1, srcset2) \
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__CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, |)
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# define CPU_XOR(destset, srcset1, srcset2) \
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__CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, ^)
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# define CPU_AND_S(setsize, destset, srcset1, srcset2) \
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__CPU_OP_S (setsize, destset, srcset1, srcset2, &)
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# define CPU_OR_S(setsize, destset, srcset1, srcset2) \
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__CPU_OP_S (setsize, destset, srcset1, srcset2, |)
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# define CPU_XOR_S(setsize, destset, srcset1, srcset2) \
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__CPU_OP_S (setsize, destset, srcset1, srcset2, ^)
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# define CPU_ALLOC_SIZE(count) __CPU_ALLOC_SIZE (count)
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# define CPU_ALLOC(count) __CPU_ALLOC (count)
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# define CPU_FREE(cpuset) __CPU_FREE (cpuset)
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/* Set the CPU affinity for a task */
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extern int sched_setaffinity (__pid_t __pid, size_t __cpusetsize,
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const cpu_set_t *__cpuset) __THROW;
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/* Get the CPU affinity for a task */
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extern int sched_getaffinity (__pid_t __pid, size_t __cpusetsize,
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cpu_set_t *__cpuset) __THROW;
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#endif
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__END_DECLS
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#endif /* sched.h */
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