sys/sys/usched.h

   1 /*
   2  * SYS/USCHED.H
   3  *
   4  *      Userland scheduler API
   5  *
   6  * $DragonFly: src/sys/sys/usched.h,v 1.15 2008/04/21 15:24:47 dillon Exp $
   7  */
   8
   9 #ifndef _SYS_USCHED_H_
  10 #define _SYS_USCHED_H_
  11
  12 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  13
  14 #ifndef _SYS_TYPES_H_
  15 #include <sys/types.h>
  16 #endif
  17 #ifndef _SYS_QUEUE_H_
  18 #include <sys/queue.h>
  19 #endif
  20 #ifndef _SYS_SYSTIMER_H_
  21 #include <sys/systimer.h>
  22 #endif
  23
  24 #define NAME_LENGTH 32
  25
  26 struct lwp;
  27 struct proc;
  28 struct globaldata;
  29
  30 struct usched {
  31     TAILQ_ENTRY(usched) entry;
  32     const char *name;
  33     const char *desc;
  34     void (*usched_register)(void);
  35     void (*usched_unregister)(void);
  36     void (*acquire_curproc)(struct lwp *);
  37     void (*release_curproc)(struct lwp *);
  38     void (*setrunqueue)(struct lwp *);
  39     void (*schedulerclock)(struct lwp *, sysclock_t, sysclock_t);
  40     void (*recalculate)(struct lwp *);
  41     void (*resetpriority)(struct lwp *);
  42     void (*heuristic_forking)(struct lwp *, struct lwp *);
  43     void (*heuristic_exiting)(struct lwp *, struct proc *);
  44     void (*uload_update)(struct lwp *);
  45     void (*setcpumask)(struct usched *, cpumask_t);
  46     void (*yield)(struct lwp *);
  47     void (*changedcpu)(struct lwp *);
  48 };
  49
  50 union usched_data {
  51     /*
  52      * BSD4 scheduler.
  53      */
  54     struct {
  55         short   priority;       /* lower is better */
  56         char    unused01;       /* (currently not used) */
  57         char    rqindex;
  58         int     batch;          /* batch mode heuristic */
  59         int     estcpu;         /* dynamic priority modification */
  60         u_short rqtype;         /* protected copy of rtprio type */
  61         u_short unused02;
  62     } bsd4;
  63     struct {
  64         short   priority;       /* lower is better */
  65         char    forked;         /* lock cpu during fork */
  66         char    rqindex;
  67         short   estfast;        /* fast estcpu collapse mode */
  68         short   uload;          /* for delta uload adjustments */
  69         int     estcpu;         /* dynamic priority modification */
  70         u_short rqtype;         /* protected copy of rtprio type */
  71         u_short qcpu;           /* which cpu are we enqueued on? */
  72         u_short rrcount;        /* reset when moved to runq tail */
  73         u_short unused01;
  74         u_short unused02;
  75         u_short unused03;
  76     } dfly;
  77
  78     int         pad[6];         /* PAD for future expansion */
  79 };
  80
  81 /*
  82  * Flags for usched_ctl()
  83  */
  84 #define        USCH_ADD        0x00000001
  85 #define        USCH_REM        0x00000010
  86
  87 #endif  /* _KERNEL || _KERNEL_STRUCTURES */
  88
  89 #define USCHED_SET_SCHEDULER    0
  90 #define USCHED_SET_CPU          1
  91 #define USCHED_ADD_CPU          2
  92 #define USCHED_DEL_CPU          3
  93 #define USCHED_GET_CPU          4
  94 #define USCHED_GET_CPUMASK      5       /* since DragonFly 4.5 */
  95 #define USCHED_SET_CPUMASK      6       /* since DragonFly 4.7 */
  96
  97 /*
  98  * Kernel variables and procedures, or user system calls.
  99  */
 100 #ifdef _KERNEL
 101
 102 extern struct usched    usched_bsd4;
 103 extern struct usched    usched_dfly;
 104 extern struct usched    usched_dummy;
 105 extern cpumask_t usched_mastermask;
 106 extern int sched_ticks; /* From sys/kern/kern_clock.c */
 107
 108 int usched_ctl(struct usched *, int);
 109 struct usched *usched_init(void);
 110 void usched_schedulerclock(struct lwp *, sysclock_t, sysclock_t);
 111
 112 #endif
 113
 114 #if !defined(_KERNEL) || defined(_KERNEL_VIRTUAL)
 115
 116 int usched_set(pid_t, int, void *, int);
 117
 118 #endif
 119
 120 #endif
 121