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/* Copyright (C) 2004 David Decotigny
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.
*/
#ifndef _SOS_SCHED_H_
#define _SOS_SCHED_H_
/**
* @file sched.h
*
* A basic scheduler with simple FIFO threads' ordering.
*
* The functions below manage CPU queues, and are NEVER responsible
* for context switches (see thread.h for that) or synchronizations
* (see kwaitq.h or the higher levels primitives [mutex, semaphore,
* ...] for that).
*
* @note IMPORTANT: all the functions below are meant to be called
* ONLY by the thread/timer/kwaitq subsystems. DO NOT use them
* directly from anywhere else: use ONLY the thread/kwaitq functions!
* If you still want to call them directly despite this disclaimer,
* simply disable interrupts before clling them.
*/
#include <sos/errno.h>
#include <sos/thread.h>
/**
* Initialize the scheduler
*
* @note: The use of this function is RESERVED
*/
sos_ret_t sos_sched_subsystem_setup();
/**
* Mark the given thread as ready
*
* @note: The use of this function is RESERVED
*/
sos_ret_t sos_sched_set_ready(struct sos_thread * thr);
/**
* Return the identifier of the next thread to run. Also removes it
* from the ready list, but does NOT set is as current_thread !
*
* @param current_thread TCB of the thread calling the function
*
* @param do_yield When TRUE, put the current executing thread at the
* end of the ready list. Otherwise it is kept at the head of it.
*
* @note: The use of this function is RESERVED
*/
struct sos_thread * sos_reschedule(struct sos_thread * current_thread,
sos_bool_t do_yield);
#endif /* _SOS_WAITQUEUE_H_ */
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