funnyos/sys/kern_sched.h - diff

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version 1.3, 2007/11/20 16:07:23

version 1.4, 2007/11/23 13:37:43

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#ifndef _SYS_KERN_SCHED_H

#define _SYS_KERN_SCHED_H

#include <sys/types.h>

#include <sys/pcb.h>

* Task header is used by user to describe task in config.c.

* u_task is used by user to describe task in config.c.

* "user task".

struct u_task {

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};

#if 0

* Task PCB (process control block).

* this is task's hardware context.

struct pcb __attribute__((packed)) {

/* ARM general purpose registers */

uint32_t p_r0;

}

#endif /* 0 */

* Kernel sees each system task as struct k_task;

* it is used for scheduling and context switches.

* "kernel task".

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uint8_t kt_state; /* task state (running, blocked, etc.) */

// uint32_t kt_timeo; /* timeout (in HZ) if task is blocked */

uint32_t kt_pcb[15]; /* hardware context (15 ARM registers) */

struct pcb kt_pcb; /* hardware context (15 ARM registers) */

struct k_task *kt_next;

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* Functions.

void sched_init(void);

void sched_tick(void);

#endif /* not _SYS_KERN_SCHED_H */