4ec9caf00c
details from consumers. - Track individual selecters on a per-descriptor basis such that there are no longer collisions and after sleeping for events only those descriptors which triggered events must be rescaned. - Protect the selinfo (per descriptor) structure with a mtx pool mutex. mtx pool mutexes were chosen to preserve api compatibility with existing code which does nothing but bzero() to setup selinfo structures. - Use a per-thread wait channel rather than a global wait channel. - Hide select implementation details in a seltd structure which is opaque to the rest of the kernel. - Provide a 'selsocket' interface for those kernel consumers who wish to select on a socket when they have no fd so they no longer have to be aware of select implementation details. Tested by: kris Reviewed on: arch
61 lines
2.3 KiB
C
61 lines
2.3 KiB
C
/*-
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)select.h 8.2 (Berkeley) 1/4/94
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* $FreeBSD$
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*/
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#ifndef _SYS_SELINFO_H_
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#define _SYS_SELINFO_H_
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#include <sys/event.h> /* for struct klist */
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struct selfd;
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TAILQ_HEAD(selfdlist, selfd);
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/*
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* Used to maintain information about processes that wish to be
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* notified when I/O becomes possible.
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*/
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struct selinfo {
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struct selfdlist si_tdlist; /* List of sleeping threads. */
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struct knlist si_note; /* kernel note list */
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struct mtx *si_mtx; /* Lock for tdlist. */
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};
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#define SEL_WAITING(si) (!TAILQ_EMPTY(&(si)->si_tdlist))
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#ifdef _KERNEL
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void selrecord(struct thread *selector, struct selinfo *sip);
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void selwakeup(struct selinfo *sip);
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void selwakeuppri(struct selinfo *sip, int pri);
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void seltdfini(struct thread *td);
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#endif
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#endif /* !_SYS_SELINFO_H_ */
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