FreeBSD/Linux Kernel Cross Reference
sys/sys/sched.h

     /*-
      * Copyright (c) 2002, Jeffrey Roberson <jeff@freebsd.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice unmodified, this list of conditions, and the following
     *    disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * $FreeBSD: releng/5.2/sys/sys/sched.h 122768 2003-11-15 23:54:49Z jeff $
     */
    
    #ifndef _SYS_SCHED_H_
    #define _SYS_SCHED_H_
    
    /*
     * General scheduling info.
     */
    int     sched_rr_interval(void);
    int     sched_runnable(void);
    
    /* 
     * Proc related scheduling hooks.
     */
    void    sched_exit(struct proc *p, struct proc *child);
    void    sched_fork(struct proc *p, struct proc *child);
    
    /*
     * KSE Groups contain scheduling priority information.  They record the
     * behavior of groups of KSEs and threads.
     */
    void    sched_class(struct ksegrp *kg, int class);
    void    sched_exit_ksegrp(struct ksegrp *kg, struct ksegrp *child);
    void    sched_fork_ksegrp(struct ksegrp *kg, struct ksegrp *child);
    void    sched_nice(struct ksegrp *kg, int nice);
    
    /*
     * Threads are switched in and out, block on resources, have temporary
     * priorities inherited from their ksegs, and use up cpu time.
     */
    void    sched_exit_thread(struct thread *td, struct thread *child);
    void    sched_fork_thread(struct thread *td, struct thread *child);
    fixpt_t sched_pctcpu(struct thread *td);
    void    sched_prio(struct thread *td, u_char prio);
    void    sched_sleep(struct thread *td, u_char prio);
    void    sched_switch(struct thread *td);
    void    sched_userret(struct thread *td);
    void    sched_wakeup(struct thread *td);
    
    /*
     * Threads are moved on and off of run queues
     */
    void    sched_add(struct thread *td);
    struct kse *sched_choose(void);         /* XXX Should be thread * */
    void    sched_clock(struct thread *td);
    void    sched_rem(struct thread *td);
    
    /*
     * Binding makes cpu affinity permanent while pinning is used to temporarily
     * hold a thread on a particular CPU.
     */
    void    sched_bind(struct thread *td, int cpu);
    static __inline void sched_pin(void);
    void    sched_unbind(struct thread *td);
    static __inline void sched_unpin(void);
    
    /*
     * These interfaces will eventually be removed.
     */
    void    sched_exit_kse(struct kse *ke, struct kse *child);
    void    sched_fork_kse(struct kse *ke, struct kse *child);
    
    /*
     * These procedures tell the process data structure allocation code how
     * many bytes to actually allocate.
     */
    int     sched_sizeof_kse(void);
    int     sched_sizeof_ksegrp(void);
    int     sched_sizeof_proc(void);
    int     sched_sizeof_thread(void);
    
    extern struct ke_sched *kse0_sched;
    extern struct kg_sched *ksegrp0_sched;
   extern struct p_sched *proc0_sched;
   extern struct td_sched *thread0_sched;
   
   static __inline void
   sched_pin(void)
   {
           curthread->td_pinned++;
   }
   
   static __inline void
   sched_unpin(void)
   {
           curthread->td_pinned--;
   }
   
   #endif /* !_SYS_SCHED_H_ */

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