91 lines
1.9 KiB
C
91 lines
1.9 KiB
C
#ifndef __KERNEL_SHEDULER_H__
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# define __KERNEL_SHEDULER_H__
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#include <stddef.h>
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#include <stdint.h>
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#include <kernel/process.h>
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#include <kernel/bits/context.h>
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// Define the number of task
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#define SCHED_TASK_NB_MAX PROCESS_MAX
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#define SCHED_QUANTUM_TICKS (4)
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// Internal struct used by the sheduler
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struct sched_task
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{
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// Process informations
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struct process *process;
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// Internal scheduler part
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// @note: defined here to facilite the
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// management in assembly
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struct sched_task *next;
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// Task status
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enum {
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SCHED_TASK_UNUSED,
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SCHED_TASK_RUNNING,
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SCHED_TASK_ZOMBIE,
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SCHED_TASK_INTERRUPTIBLE,
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SCHED_TASK_UNINTERRUPTIBLE,
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SCHED_TASK_STOPPED,
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} status;
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// Preemptif part (not implemented yet)
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struct {
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uint8_t _static;
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int8_t _dynamic;
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} priority;
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};
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//---
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// Internal function
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//---
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/*
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** Initialize scheduler cache
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** @note: only called once by the kernel.
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*/
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extern void sched_initialize(void);
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/*
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** Add new process to sheduler
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*/
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extern int sched_task_add(struct process *process);
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/*
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** Internal function wich will stop process (SIGSTOP)
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*/
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extern void sched_task_stop(struct process *process);
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/*
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** Internal function wich will allow process to "restart".
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** (SIGCONT, continue signal)
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*/
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extern void sched_task_continue(struct process *process);
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/*
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** Wake up sleeping process if it's can be interrupted
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*/
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extern void sched_task_wake_up(struct process *process);
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/*
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** Start shedluler (in theory, this function is called only
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** time by the kernel during "bootstrap" part).
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*/
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extern void sched_start(void);
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/*
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** Get the current task context and the next one
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** based on internal task priority / status.
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*/
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extern int sched_schedule(struct cpu_context **current, struct cpu_context **next);
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/*
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** Internal function wich will switch current process
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** context with the next context
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*/
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extern void sched_context_switch(struct cpu_context *current, struct cpu_context *next);
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#endif /*__KERNEL_SHEDULER_H__*/
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