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

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1992, 1993
      *      The Regents of the University of California.  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, 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.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
     *
     *      @(#)select.h    8.2 (Berkeley) 1/4/94
     * $FreeBSD$
     */
    
    #ifndef _SYS_SELINFO_H_
    #define _SYS_SELINFO_H_
    
    #include <sys/event.h>          /* for struct klist */
    
    struct selfd;
    TAILQ_HEAD(selfdlist, selfd);
    
    /*
     * Used to maintain information about processes that wish to be
     * notified when I/O becomes possible.
     */
    struct selinfo {
            struct selfdlist        si_tdlist;      /* List of sleeping threads. */
            struct knlist           si_note;        /* kernel note list */
            struct mtx              *si_mtx;        /* Lock for tdlist. */
    };
    
    #define SEL_WAITING(si)         (!TAILQ_EMPTY(&(si)->si_tdlist))
    
    #ifdef _KERNEL
    void    seldrain(struct selinfo *sip);
    void    selrecord(struct thread *selector, struct selinfo *sip);
    void    selwakeup(struct selinfo *sip);
    void    selwakeuppri(struct selinfo *sip, int pri);
    void    seltdfini(struct thread *td);
    #endif
    
    #endif /* !_SYS_SELINFO_H_ */

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