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/*
* Module: sched.h
*
* Purpose:
* Provides an implementation of POSIX realtime extensions
* as defined in
*
* POSIX 1003.1b-1993 (POSIX.1b)
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright (C) 1998
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA
*/
#ifndef _SCHED_H
#define _SCHED_H
#if defined(__MINGW32__) || defined(_UWIN)
/* For pid_t */
# include <sys/types.h>
/* Required by Unix 98 */
# include <time.h>
#else
typedef int pid_t;
#endif
/* Thread scheduling policies */
enum {
SCHED_OTHER = 0,
SCHED_FIFO,
SCHED_RR,
SCHED_MIN = SCHED_OTHER,
SCHED_MAX = SCHED_RR
};
struct sched_param {
int sched_priority;
};
#ifdef __cplusplus
extern "C"
{
#endif /* __cplusplus */
int sched_yield (void);
int sched_get_priority_min (int policy);
int sched_get_priority_max (int policy);
int sched_setscheduler (pid_t pid, int policy);
int sched_getscheduler (pid_t pid);
/*
* Note that this macro returns ENOTSUP rather than
* ENOSYS as might be expected. However, returning ENOSYS
* should mean that sched_get_priority_{min,max} are
* not implemented as well as sched_rr_get_interval.
* This is not the case, since we just don't support
* round-robin scheduling. Therefore I have chosen to
* return the same value as sched_setscheduler when
* SCHED_RR is passed to it.
*/
#define sched_rr_get_interval(_pid, _interval) \
( errno = ENOTSUP, (int) -1 )
#ifdef __cplusplus
} /* End of extern "C" */
#endif /* __cplusplus */
#endif /* !_SCHED_H */
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