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os-k/include/kernel/sched.h
2019-04-06 07:53:58 +02:00

81 lines
3.0 KiB
C

//----------------------------------------------------------------------------//
// GNU GPL OS/K //
// //
// Desc: Scheduler-related functions //
// //
// //
// 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/>. //
//----------------------------------------------------------------------------//
#ifndef _KALKERN_BASE_H
#include <kernel/base.h>
#endif
#ifndef _KALKERN_SCHED_H
#define _KALKERN_SCHED_H
//------------------------------------------//
//
// Value of the preemption count indicating that preemption is activated
//
enum { PREEMPT_ON = 0 };
// Time in ticks a process should be run
enum
{
DEF_PROC_TSLICE = 3, // 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 *PsPrioClassesNames[];
//------------------------------------------//
//
// Re-scheduling and preemption
// XXX atomic operations
//
#define PsRequestReSched() (++KeCurCPU->needReSched)
#define PsDisablePreemption() (++KeCurCPU->preemptCount)
#define PsEnablePreemption() do { assert(KeCurCPU->preemptCount > 0); \
--KeCurCPU->preemptCount; } while(0)
//------------------------------------------//
void PsInitSched(void);
void PsFiniSched(void);
void PsSchedThisProc(Process_t *);
void PsSchedOnTick(void);
//------------------------------------------//
#endif