The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*
    2  * Copyright (C) 2001 Julian Elischer <julian@freebsd.org>
    3  * for the FreeBSD Foundation.
    4  *
    5  *  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice(s), this list of conditions and the following disclaimer as
   12  *    the first lines of this file unmodified other than the possible 
   13  *    addition of one or more copyright notices.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice(s), this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
   19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   21  * DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
   22  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   25  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
   28  * DAMAGE.
   29  *
   30  * $FreeBSD: releng/5.1/sys/sys/kse.h 113793 2003-04-21 07:27:59Z davidxu $
   31  */
   32 
   33 #ifndef _SYS_KSE_H_
   34 #define _SYS_KSE_H_
   35 
   36 #include <machine/kse.h>
   37 #include <sys/ucontext.h>
   38 #include <sys/time.h>
   39 
   40 /*
   41  * This file defines the structures needed for communication between
   42  * the userland and the kernel when running a KSE-based threading system.
   43  * The only programs that should see this file are the user thread
   44  * scheduler (UTS) and the kernel.
   45  */
   46 struct kse_mailbox;
   47 
   48 typedef void    kse_func_t(struct kse_mailbox *);
   49 
   50 /*
   51  * Thread mailbox.
   52  *
   53  * This describes a user thread to the kernel scheduler.
   54  */
   55 struct kse_thr_mailbox {
   56         ucontext_t              tm_context;     /* User and machine context */
   57         unsigned int            tm_flags;       /* Thread flags */
   58         struct kse_thr_mailbox  *tm_next;       /* Next thread in list */
   59         void                    *tm_udata;      /* For use by the UTS */
   60         unsigned int            tm_uticks;
   61         unsigned int            tm_sticks;
   62         int                     tm_spare[8];
   63 };
   64 
   65 /*
   66  * KSE mailbox.
   67  *
   68  * Communication path between the UTS and the kernel scheduler specific to
   69  * a single KSE.
   70  */
   71 struct kse_mailbox {
   72         int                     km_version;     /* Mailbox version */
   73         struct kse_thr_mailbox  *km_curthread;  /* Currently running thread */
   74         struct kse_thr_mailbox  *km_completed;  /* Threads back from kernel */
   75         sigset_t                km_sigscaught;  /* Caught signals */
   76         unsigned int            km_flags;       /* KSE flags */
   77         kse_func_t              *km_func;       /* UTS function */
   78         stack_t                 km_stack;       /* UTS context */
   79         void                    *km_udata;      /* For use by the UTS */
   80         struct timespec         km_timeofday;   /* Time of day */
   81         int                     km_quantum;     /* Upcall quantum in msecs */
   82         int                     km_spare[8];
   83 };
   84 
   85 #define KSE_VER_0       0
   86 #define KSE_VERSION     KSE_VER_0
   87 
   88 /* These flags are kept in km_flags */
   89 #define KMF_NOUPCALL            0x01
   90 #define KMF_NOCOMPLETED         0x02
   91 
   92 #ifndef _KERNEL
   93 int     kse_create(struct kse_mailbox *, int);
   94 int     kse_exit(void);
   95 int     kse_release(struct timespec *);
   96 int     kse_thr_interrupt(struct kse_thr_mailbox *);
   97 int     kse_wakeup(struct kse_mailbox *);
   98 #endif  /* !_KERNEL */
   99 
  100 #endif  /* !_SYS_KSE_H_ */

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