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/selinfo.h

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    1 /*-
    2  * Copyright (c) 1992, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)select.h    8.2 (Berkeley) 1/4/94
   30  * $FreeBSD$
   31  */
   32 
   33 #ifndef _SYS_SELINFO_H_
   34 #define _SYS_SELINFO_H_
   35 
   36 #include <sys/event.h>          /* for struct klist */
   37 
   38 /*
   39  * Used to maintain information about processes that wish to be
   40  * notified when I/O becomes possible.
   41  */
   42 struct selinfo {
   43         TAILQ_ENTRY(selinfo)    si_thrlist;     /* list hung off of thread */
   44         struct  thread *si_thread;      /* thread waiting */
   45         struct  knlist si_note; /* kernel note list */
   46         short   si_flags;       /* see below */
   47 };
   48 #define SI_COLL 0x0001          /* collision occurred */
   49 
   50 #define SEL_WAITING(si) \
   51         ((si)->si_thread != NULL || ((si)->si_flags & SI_COLL) != 0)
   52 
   53 #ifdef _KERNEL
   54 void    clear_selinfo_list(struct thread *td);
   55 void    selrecord(struct thread *selector, struct selinfo *sip);
   56 void    selwakeup(struct selinfo *sip);
   57 void    selwakeuppri(struct selinfo *sip, int pri);
   58 #endif
   59 
   60 #endif /* !_SYS_SELINFO_H_ */

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