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

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//----------------------------------------------------------------------------//
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// OS on Kaleid //
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// //
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// Desc: Scheduler-related functions //
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// //
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// //
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// Copyright © 2018-2021 The OS/K Team //
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// //
// 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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//----------------------------------------------------------------------------//
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#ifndef _KERNEL_H
#include <kernel.h>
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#endif
#ifndef _KALKERN_SCHED_H
#define _KALKERN_SCHED_H
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//----------------------------------------------------------------------------//
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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
{
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DEF_PROC_TSLICE = 3, // 20 ticks
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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
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extern const char *PsPrioClassesNames[];
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//----------------------------------------------------------------------------//
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//
// Re-scheduling and preemption
// XXX atomic operations
//
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#define PsRequestReSched() do { ++KeCurCPU->needReSched; } while (0)
#define PsDisablePreemption() do { ++KeCurCPU->preemptCount; } while (0)
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#define PsEnablePreemption() do { assert(KeCurCPU->preemptCount > 0); \
--KeCurCPU->preemptCount; } while(0)
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//----------------------------------------------------------------------------//
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void PsInitSched(void);
void PsFiniSched(void);
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void PsSchedThisProc(Process_t *);
void PsSchedOnTick(void);
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//----------------------------------------------------------------------------//
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#endif