/* * FILENAME: task.h * * Copyright 1999- 2004 By InterNiche Technologies Inc. All rights reserved * Portions Copyright 1983 by the Massachusetts Institute of Technology  * * This file contains definitions for the multi-tasking package. * * MODULE: NTF * * * PORTABLE: yes */#ifndef _TASK_H_#define  _TASK_H_    1/* Pattern written into the stack area */#ifdef   SEG16_16#define  GUARDWORD   0x5354      /* hex for ST */#else#define  GUARDWORD   0x53544143  /* hex for STAC */#endiftypedef  int   stack_t;       /* type of data in task stacks *//* NOTE: if you change this, be sure to change all the assembly which  * depends on it too!!! */struct task{    struct task *  tk_next;    /* pointer to next task */   stack_t *   tk_fp;         /* task's current frame ptr */   char *      tk_name;       /* the task's name */   int         tk_flags;      /* flag set if task is scheduled */   u_long      tk_count;      /* number of wakeups */   stack_t *   tk_guard;      /* pointer to lowest guardword */   unsigned    tk_size;       /* stack size */   stack_t *   tk_stack;      /* base of task's stack */   void *      tk_event;      /* event to wake blocked task */   u_long      tk_waketick;   /* tick to wake up sleeping task */   int         tk_tid;        /* taskid */};typedef struct task task;/* tk_flags bits */#define  TF_AWAKE       0x0001   /* task is ready to run */#define  TF_MAIN        0x0002   /* task is using system stack */extern   struct task *  tk_cur;  /* currently running task */extern   unsigned TDEBUG;        /* tasking debugging */extern   u_long   tk_wakeups;/* entry points to tasking system */task *   tk_init(stack_t * base, int st_size);task *   tk_new(task*, int(*)(int), int, char*, int);    /* fork a new task */void     tk_block(void);            /* switch to next runnable task */void     tk_exit(void);             /* kill & delete current task */ void     tk_kill(task * tk_to_die); /* mark any task for death */void     tk_wake(task * tk);        /* mark a task to run */void     tk_sleep(long ticks);      /* sleep for number of ticks */void     tk_ev_block(void * event); /* block until event occurs */void     tk_ev_wake(void * event);  /* wake tasks waiting for event *//* non-portable task utility routines */stack_t * tk_frame(task *, int(*)(int), unsigned);void      tk_switch(task *);        /* run the next task */stack_t * tk_getsp(void);     /* get current stack pointer *//* the yield() macro */#define  tk_next()      {  tk_wake(tk_cur);  tk_block(); }
#ifdef USE_PROFILER
#define  IN_PROFILER(id, opcode)  pf_ticklog((struct pbucket *)id, opcode)
#else
#define  IN_PROFILER(id,  opcode)  /* define away */
#endif   /* USE_PROFILER */

#endif   /* _TASK_H_ */