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Annotation of funnyos/sys/kern_sched.h, Revision 1.3

1.1       nbrk        1: /*
1.3     ! nbrk        2:  * $Id: kern_sched.h,v 1.2 2007/11/20 12:57:37 nbrk Exp $
1.1       nbrk        3:  */
                      4: #ifndef _SYS_KERN_SCHED_H
                      5: #define _SYS_KERN_SCHED_H
                      6: #include <sys/types.h>
                      7:
                      8: /*
1.3     ! nbrk        9:  * Task header is used by user to describe task in config.c.
        !            10:  * "user task".
1.1       nbrk       11:  */
1.3     ! nbrk       12: struct u_task {
        !            13:        const char *ut_name;                    /* task name */
        !            14:        uint8_t         ut_priority;            /* priority, bigger the value = higher priority */
        !            15:        void            (*ut_enter)(void);      /* entry point */
1.1       nbrk       16: };
                     17:
1.3     ! nbrk       18:
        !            19: #if 0
        !            20: /*
        !            21:  * Task PCB (process control block).
        !            22:  * this is task's hardware context.
        !            23:  */
        !            24: struct pcb __attribute__((packed)) {
        !            25:
        !            26:        /* ARM general purpose registers */
        !            27:        uint32_t        p_r0;
        !            28:
        !            29: }
        !            30: #endif /* 0 */
        !            31:
1.1       nbrk       32: /*
1.3     ! nbrk       33:  * Kernel sees each system task as struct k_task;
1.1       nbrk       34:  * it is used for scheduling and context switches.
1.3     ! nbrk       35:  * "kernel task".
1.1       nbrk       36:  */
1.3     ! nbrk       37: struct k_task {
        !            38:        struct u_task   *kt_utask;      /* points to user-described data */
        !            39:        uint8_t                 kt_tid;         /* task id (TID) */
        !            40:
        !            41:        uint8_t                 kt_state;       /* task state (running, blocked, etc.) */
        !            42: //     uint32_t                kt_timeo;       /* timeout (in HZ) if task is blocked */
        !            43:        uint32_t                kt_pcb[15];     /* hardware context (15 ARM registers) */
        !            44:
1.2       nbrk       45:
1.3     ! nbrk       46:        struct k_task   *kt_next;
1.1       nbrk       47: };
                     48:
                     49: /*
                     50:  * Tasks states.
                     51:  */
                     52: #define TASK_NOSCHED   0x00    /* task not ready or halted; will not schedule this */
                     53: #define TASK_READY             0x01    /* ready for schedule */
                     54: #define TASK_RUNNING   0x02    /* running now */
                     55: #define TASK_SLEEPING  0x04    /* task waits for (planned) timeout */
1.2       nbrk       56:
                     57:
                     58: /*
                     59:  * Functions.
                     60:  */
                     61: void   sched_init(void);
1.1       nbrk       62:
                     63:
                     64: #endif /* not _SYS_KERN_SCHED_H */
                     65: