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138 lines
3.6 KiB
C
138 lines
3.6 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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* Pthreads-embedded (PTE) - POSIX Threads Library for embedded systems
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* Copyright(C) 2008 Jason Schmidlapp
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*
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* Contact Email: jschmidlapp@users.sourceforge.net
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*
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*
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* Pthreads-embedded (PTE) - POSIX Threads Library for embedded systems
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* Copyright(C) 2008 Jason Schmidlapp
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*
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* Contact Email: jschmidlapp@users.sourceforge.net
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*
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*
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* Based upon Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The original list of contributors to the Pthreads-win32 project
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* is contained in the file CONTRIBUTORS.ptw32 included with the
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* source code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This 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 of the License, or (at your option) any later version.
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*
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* This 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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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#ifndef _SCHED_H
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#define _SCHED_H
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#include <pte_types.h>
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#undef PTE_LEVEL
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#if defined(_POSIX_SOURCE)
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#define PTE_LEVEL 0
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/* Early POSIX */
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#endif
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#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 199309
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#undef PTE_LEVEL
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#define PTE_LEVEL 1
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/* Include 1b, 1c and 1d */
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#endif
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#if defined(INCLUDE_NP)
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#undef PTE_LEVEL
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#define PTE_LEVEL 2
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/* Include Non-Portable extensions */
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#endif
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#define PTE_LEVEL_MAX 3
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#if !defined(PTE_LEVEL)
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#define PTE_LEVEL PTE_LEVEL_MAX
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/* Include everything */
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#endif
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/*
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*
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*/
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/* Thread scheduling policies */
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enum
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{
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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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{
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int sched_priority;
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};
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#ifdef __cplusplus
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extern "C"
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{
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#endif /* __cplusplus */
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int sched_yield (void);
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int sched_get_priority_min (int policy);
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int sched_get_priority_max (int policy);
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int sched_setscheduler (pid_t pid, int policy);
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/*
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* Note that this macro returns ENOTSUP rather than
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* ENOSYS as might be expected. However, returning ENOSYS
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* should mean that sched_get_priority_{min,max} are
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* not implemented as well as sched_rr_get_interval.
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* This is not the case, since we just don't support
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* round-robin scheduling. Therefore I have chosen to
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* return the same value as sched_setscheduler when
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* SCHED_RR is passed to it.
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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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#ifdef __cplusplus
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} /* End of extern "C" */
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#endif /* __cplusplus */
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#undef PTE_LEVEL
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#undef PTE_LEVEL_MAX
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#endif /* !_SCHED_H */
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