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os-k/kaleid/include/kernel/sched.h

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//----------------------------------------------------------------------------//
// GNU GPL OS/K //
// //
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// Desc: Scheduler-related functions //
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// //
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// //
// Copyright © 2018-2019 The OS/K Team //
// //
// This file is part of OS/K. //
// //
// OS/K 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 3 of the License, or //
// any later version. //
// //
// OS/K 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 OS/K. If not, see <https://www.gnu.org/licenses/>. //
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//----------------------------------------------------------------------------//
#ifndef _KALKERN_BASE_H
#include <kernel/base.h>
#endif
#ifndef _KALKERN_SCHED_H
#define _KALKERN_SCHED_H
//------------------------------------------//
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//
// Value of the preemption count indicating that preemption is activated
//
enum { PREEMPT_ON = 0 };
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// Time in ticks a process should be run
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enum
{
DEF_PROC_TSLICE = 5, // 20 ticks
TCR_PROC_TSLICE = 20000 // 20000 ticks (time critical)
};
// Priority classes
enum
{
TIME_CRIT_PROC = 0,
SERV_PRIO_PROC = 1,
REGL_PRIO_PROC = 2,
IDLE_PRIO_PROC = 3,
};
// Names of the priority classes
extern const char *PrioClassesNames[];
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//------------------------------------------//
DEC_PER_CPU(ReSchedFlag, needReSched, bool);
DEC_PER_CPU(PreemptCount, preemptCount, ulong);
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DEC_PER_CPU(IdlePrioProcs, idlePrioProcs, ListHead_t *);
DEC_PER_CPU(ReglPrioProcs, reglPrioProcs, ListHead_t *);
DEC_PER_CPU(ServPrioProcs, servPrioProcs, ListHead_t *);
DEC_PER_CPU(TimeCritProcs, timeCritProcs, ListHead_t *);
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//------------------------------------------//
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//
// Re-scheduling and preemption
// XXX atomic operations
//
#define SetReSchedFlag(x) _SetReSchedFlag(x)
#define DisablePreemption() _SetPreemptCount(GetPreemptCount()+1)
#define EnablePreemption() do { KalAssert(GetPreemptCount() > 0); \
_SetPreemptCount(GetPreemptCount()-1); } while(0)
//------------------------------------------//
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void SchedInit(void);
void SchedFini(void);
void SchedThisProc(Process_t *);
void SchedOnTick(void);
//------------------------------------------//
#endif