funnyos/sys/kern_sched.h - diff

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Diff for /funnyos/sys/kern_sched.h between version 1.1 and 1.4

version 1.1, 2007/11/19 15:54:33

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 taskheader {

struct u_task {

const char *th_name; /* task name */

const char *ut_name; /* task name */

void (*th_enter)(void *arg); /* entry point */

uint8_t ut_priority; /* priority, bigger the value = higher priority */

uint8_t ta_priority; /* priority, less value = higher priority */

void (*ut_enter)(void); /* entry point */

};

* Kernel sees each system task as struct task;

* Kernel sees each system task as struct k_task;

* it is used for scheduling and context switches.

* "kernel task".

struct task {

struct k_task {

struct taskheader *ta_theader; /* points to user-described data */

struct u_task *kt_utask; /* points to user-described data */

uint8_t ta_taskid; /* task id (TID) */

uint8_t kt_tid; /* task id (TID) */

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

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

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

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

uint32_t *ta_stackptr; /* task stack addr (used to switch-back to that task) */

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

struct k_task *kt_next;

};

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#define TASK_RUNNING 0x02 /* running now */

#define TASK_SLEEPING 0x04 /* task waits for (planned) timeout */

* Functions.

void sched_init(void);

void sched_tick(void);

#endif /* not _SYS_KERN_SCHED_H */

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