238 lines
8.0 KiB
C
238 lines
8.0 KiB
C
/*
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* Module: sched.h
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*
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* Purpose:
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* Provides an implementation of POSIX realtime extensions
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* as defined in
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*
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* POSIX 1003.1b-1993 (POSIX.1b)
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads4w - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999-2018, Pthreads4w contributors
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*
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* Homepage: https://sourceforge.net/projects/pthreads4w/
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* https://sourceforge.net/p/pthreads4w/wiki/Contributors/
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*
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* This file is part of Pthreads4w.
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*
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* Pthreads4w is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Pthreads4w 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Pthreads4w. If not, see <http://www.gnu.org/licenses/>. *
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*/
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#if !defined(_SCHED_H)
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#define _SCHED_H
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#define __SCHED_H_SOURCED__
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#include <_ptw32.h>
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/* We need a typedef for pid_t, (and POSIX requires <sched.h> to
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* define it, as it is defined in <sys/types.h>, but it does NOT
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* sanction exposure of everything from <sys/types.h>); there is
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* no pid_t in Windows anyway, (except that MinGW does define it
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* in their <sys/types.h>), so just provide a suitable typedef,
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* but note that we must do so cautiously, to avoid a typedef
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* conflict if MinGW's <sys/types.h> is also #included:
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*/
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#if ! defined __MINGW32__ || ! defined __have_typedef_pid_t
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# if defined __MINGW64__
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typedef __int64 pid_t;
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# else
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typedef int pid_t;
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#endif
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#if __GNUC__ < 4
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/* GCC v4.0 and later, (as used by MinGW), allows us to repeat a
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* typedef, provided every duplicate is consistent; only set this
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* multiple definition guard when we cannot be certain that it is
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* permissable to repeat typedefs.
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*/
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#define __have_typedef_pid_t 1
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#endif
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#endif
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/* POSIX.1-1993 says that <sched.h> WILL expose all of <time.h>
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*/
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#undef __SCHED_H_SOURCED__
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#if _POSIX_C_SOURCE >= 200112L
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/* POSIX.1-2001 and later revises this to say only that it MAY do so;
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* only struct timespec, and associated time_t are actually required,
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* so prefer to be selective; (MinGW.org's <time.h> offers an option
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* for selective #inclusion, when __SCHED_H_SOURCED__ is defined):
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*/
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#define __SCHED_H_SOURCED__
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#define __need_struct_timespec
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#define __need_time_t
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#endif
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#include <time.h>
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#if defined __MINGW64__ || _MSC_VER >= 1900
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/* These are known to define struct timespec, when <time.h> has been
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* #included, but may not, (probably don't), follow the convention of
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* defining __struct_timespec_defined, as adopted by MinGW.org; for
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* these cases, we unconditionally assume that struct timespec has
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* been defined, otherwise, if MinGW.org's criterion has not been
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* satisfied...
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*/
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#elif ! defined __struct_timespec_defined
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# ifndef _TIMESPEC_DEFINED
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# define _TIMESPEC_DEFINED
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struct timespec
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{ /* ...we fall back on this explicit definition.
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*/
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time_t tv_sec;
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int tv_nsec;
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};
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# endif
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#endif
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/*
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* Microsoft VC++6.0 lacks these *_PTR types
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*/
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#if defined(_MSC_VER) && _MSC_VER < 1300 && !defined(PTW32_HAVE_DWORD_PTR)
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typedef unsigned long ULONG_PTR;
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typedef ULONG_PTR DWORD_PTR;
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#endif
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/* Thread scheduling policies */
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enum
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{ SCHED_OTHER = 0,
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SCHED_FIFO,
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SCHED_RR,
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SCHED_MIN = SCHED_OTHER,
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SCHED_MAX = SCHED_RR
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};
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struct sched_param
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{ int sched_priority;
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};
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/*
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* CPU affinity
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*
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* cpu_set_t:
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* Considered opaque but cannot be an opaque pointer due to the need for
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* compatibility with GNU systems and sched_setaffinity() et.al., which
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* include the cpusetsize parameter "normally set to sizeof(cpu_set_t)".
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*
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* FIXME: These are GNU, and NOT specified by POSIX; maybe consider
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* occluding them within a _GNU_SOURCE (or similar) feature test.
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*/
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#define CPU_SETSIZE (sizeof(size_t)*8)
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#define CPU_COUNT(setptr) (_sched_affinitycpucount(setptr))
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#define CPU_ZERO(setptr) (_sched_affinitycpuzero(setptr))
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#define CPU_SET(cpu, setptr) (_sched_affinitycpuset((cpu),(setptr)))
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#define CPU_CLR(cpu, setptr) (_sched_affinitycpuclr((cpu),(setptr)))
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#define CPU_ISSET(cpu, setptr) (_sched_affinitycpuisset((cpu),(setptr)))
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#define CPU_AND(destsetptr, srcset1ptr, srcset2ptr) (_sched_affinitycpuand((destsetptr),(srcset1ptr),(srcset2ptr)))
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#define CPU_OR(destsetptr, srcset1ptr, srcset2ptr) (_sched_affinitycpuor((destsetptr),(srcset1ptr),(srcset2ptr)))
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#define CPU_XOR(destsetptr, srcset1ptr, srcset2ptr) \
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(_sched_affinitycpuxor((destsetptr),(srcset1ptr),(srcset2ptr)))
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#define CPU_EQUAL(set1ptr, set2ptr) (_sched_affinitycpuequal((set1ptr),(set2ptr)))
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typedef union
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{ char cpuset[CPU_SETSIZE/8];
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size_t _align;
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} cpu_set_t;
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__PTW32_BEGIN_C_DECLS
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PTW32_DLLPORT int PTW32_CDECL sched_yield (void);
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PTW32_DLLPORT int PTW32_CDECL sched_get_priority_min (int policy);
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PTW32_DLLPORT int PTW32_CDECL sched_get_priority_max (int policy);
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/* FIXME: this declaration of sched_setscheduler() is NOT as prescribed
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* by POSIX; it lacks const struct sched_param * as third argument.
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*/
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PTW32_DLLPORT int PTW32_CDECL sched_setscheduler (pid_t pid, int policy);
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/* FIXME: In addition to the above five functions, POSIX also requires:
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*
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* int sched_getparam (pid_t, struct sched_param *);
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* int sched_setparam (pid_t, const struct sched_param *);
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*
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* both of which are conspicuous by their absence here!
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*/
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/* Compatibility with Linux - not standard in POSIX
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* FIXME: consider occluding within a _GNU_SOURCE (or similar) feature test.
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*/
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PTW32_DLLPORT int PTW32_CDECL sched_setaffinity (pid_t pid, size_t cpusetsize, cpu_set_t *mask);
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PTW32_DLLPORT int PTW32_CDECL sched_getaffinity (pid_t pid, size_t cpusetsize, cpu_set_t *mask);
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/*
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* Support routines and macros for cpu_set_t
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*/
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PTW32_DLLPORT int PTW32_CDECL _sched_affinitycpucount (const cpu_set_t *set);
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PTW32_DLLPORT void PTW32_CDECL _sched_affinitycpuzero (cpu_set_t *pset);
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PTW32_DLLPORT void PTW32_CDECL _sched_affinitycpuset (int cpu, cpu_set_t *pset);
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PTW32_DLLPORT void PTW32_CDECL _sched_affinitycpuclr (int cpu, cpu_set_t *pset);
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PTW32_DLLPORT int PTW32_CDECL _sched_affinitycpuisset (int cpu, const cpu_set_t *pset);
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PTW32_DLLPORT void PTW32_CDECL _sched_affinitycpuand(cpu_set_t *pdestset, const cpu_set_t *psrcset1, const cpu_set_t *psrcset2);
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PTW32_DLLPORT void PTW32_CDECL _sched_affinitycpuor(cpu_set_t *pdestset, const cpu_set_t *psrcset1, const cpu_set_t *psrcset2);
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PTW32_DLLPORT void PTW32_CDECL _sched_affinitycpuxor(cpu_set_t *pdestset, const cpu_set_t *psrcset1, const cpu_set_t *psrcset2);
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PTW32_DLLPORT int PTW32_CDECL _sched_affinitycpuequal (const cpu_set_t *pset1, const cpu_set_t *pset2);
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/* Note that this macro returns ENOTSUP rather than ENOSYS, as
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* might be expected. However, returning ENOSYS should mean that
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* sched_get_priority_{min,max} are not implemented as well as
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* sched_rr_get_interval. This is not the case, since we just
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* don't support round-robin scheduling. Therefore I have chosen
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* to return the same value as sched_setscheduler when SCHED_RR
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* is passed to it.
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*
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* FIXME: POSIX requires this to be defined as a function; this
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* macro implementation is permitted IN ADDITION to the function,
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* but the macro alone is not POSIX compliant! Worse still, it
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* imposes a requirement on the caller, to ensure that both the
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* declaration of errno, and the definition of ENOTSUP, are in
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* scope at point of call, (which it may wish to do anyway, but
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* POSIX imposes no such constraint)!
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*/
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#define sched_rr_get_interval(_pid, _interval) \
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( errno = ENOTSUP, (int) -1 )
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__PTW32_END_C_DECLS
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#undef __SCHED_H_SOURCED__
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#endif /* !_SCHED_H */
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