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

     /*
      * Copyright (C) 2001 Julian Elischer <julian@freebsd.org>
      * for the FreeBSD Foundation.
      *
      *  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(s), this list of conditions and the following disclaimer as
     *    the first lines of this file unmodified other than the possible 
     *    addition of one or more copyright notices.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice(s), 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 COPYRIGHT HOLDER(S) ``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 COPYRIGHT HOLDER(S) 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/kse.h 118486 2003-08-05 12:00:55Z davidxu $
     */
    
    #ifndef _SYS_KSE_H_
    #define _SYS_KSE_H_
    
    #include <machine/kse.h>
    #include <sys/ucontext.h>
    #include <sys/time.h>
    #include <sys/signal.h>
    
    /*
     * This file defines the structures needed for communication between
     * the userland and the kernel when running a KSE-based threading system.
     * The only programs that should see this file are the user thread
     * scheduler (UTS) and the kernel.
     */
    struct kse_mailbox;
    
    typedef void    kse_func_t(struct kse_mailbox *);
    
    /*
     * Thread mailbox.
     *
     * This describes a user thread to the kernel scheduler.
     */
    struct kse_thr_mailbox {
            ucontext_t              tm_context;     /* User and machine context */
            unsigned int            tm_flags;       /* Thread flags */
            struct kse_thr_mailbox  *tm_next;       /* Next thread in list */
            void                    *tm_udata;      /* For use by the UTS */
            uint32_t                tm_uticks;
            uint32_t                tm_sticks;
            siginfo_t               tm_syncsig;
            int                     tm_spare[8];
    };
    
    /*
     * KSE mailbox.
     *
     * Communication path between the UTS and the kernel scheduler specific to
     * a single KSE.
     */
    struct kse_mailbox {
            int                     km_version;     /* Mailbox version */
            struct kse_thr_mailbox  *km_curthread;  /* Currently running thread */
            struct kse_thr_mailbox  *km_completed;  /* Threads back from kernel */
            sigset_t                km_sigscaught;  /* Caught signals */
            uint32_t                km_flags;       /* KSE flags */
            kse_func_t              *km_func;       /* UTS function */
            stack_t                 km_stack;       /* UTS context */
            void                    *km_udata;      /* For use by the UTS */
            struct timespec         km_timeofday;   /* Time of day */
            int                     km_quantum;     /* Upcall quantum in msecs */
            int                     km_spare[8];
    };
    
    #define KSE_VER_0       0
    #define KSE_VERSION     KSE_VER_0
    
    /* These flags are kept in km_flags */
    #define KMF_NOUPCALL            0x01
    #define KMF_NOCOMPLETED         0x02
    #define KMF_DONE                0x04
    #define KMF_BOUND               0x08
    #define KMF_WAITSIGEVENT        0x10
    
    /* These flags are kept in tm_flags */
    #define TMF_NOUPCALL            0x01
    
   /* Commands for kse_thr_interrupt */
   #define KSE_INTR_INTERRUPT      0x01
   #define KSE_INTR_RESTART        0x02
   #define KSE_INTR_SENDSIG        0x03
   #define KSE_INTR_SIGEXIT        0x04
   
   #ifndef _KERNEL
   int     kse_create(struct kse_mailbox *, int);
   int     kse_exit(void);
   int     kse_release(struct timespec *);
   int     kse_thr_interrupt(struct kse_thr_mailbox *, int, long);
   int     kse_wakeup(struct kse_mailbox *);
   #endif  /* !_KERNEL */
   
   #endif  /* !_SYS_KSE_H_ */

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