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Viewing changes to mit-pthreads/include/pthread/fd.h

  • Committer: bk at mysql
  • Date: 2000-07-31 19:29:14 UTC
  • Revision ID: sp1r-bk@work.mysql.com-20000731192914-08846
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mit-pthreads/include/pthread/fd.h
 
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/* ==== fd.h ============================================================
 
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 * Copyright (c) 1993, 1994 by Chris Provenzano, proven@mit.edu
 
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 * 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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 * 3. All advertising materials mentioning features or use of this software
 
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 *    must display the following acknowledgement:
 
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 *  This product includes software developed by Chris Provenzano.
 
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 * 4. The name of Chris Provenzano may not be used to endorse or promote 
 
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 *        products derived from this software without specific prior written
 
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 *        permission.
 
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 *
 
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 * THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO ``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 CHRIS PROVENZANO BE LIABLE FOR ANY 
 
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 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 
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 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
 
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 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 
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 * 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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 * $Id$
 
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 *
 
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 * Description : Basic fd header.
 
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 *
 
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 *  1.00 93/08/14 proven
 
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 *      -Started coding this file.
 
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 *
 
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 *      1.01 93/11/13 proven
 
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 *              -The functions readv() and writev() added
 
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 */
 
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/*
 
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 * New pthread types.
 
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 */
 
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enum fd_type {
 
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        FD_NT,                                  /* Not tested */
 
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        FD_NIU,                                 /* Known to be not in use */
 
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        FD_HALF_DUPLEX,                 /* Files, and seeking devices */
 
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        FD_FULL_DUPLEX,                 /* pipes, sockets, drivers, ... */
 
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        FD_TEST_HALF_DUPLEX,    /* Redo machdep_sys_fcntl */
 
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        FD_TEST_FULL_DUPLEX     /* Redo machdep_sys_fcntl */
 
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};
 
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#define FD_READ                         0x1
 
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#define FD_WRITE                        0x2
 
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#define FD_RDWR                         (FD_READ | FD_WRITE)
 
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union fd_data {
 
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        void                                    *ptr;
 
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        int                                             i;
 
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};
 
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struct timespec;
 
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struct iovec;
 
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struct fd_ops {
 
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        pthread_ssize_t                 (*write) __P_((union fd_data, int, const void *,
 
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                                                                                  size_t, struct timespec *));
 
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        pthread_ssize_t                 (*read) __P_((union fd_data, int, void *, size_t,
 
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                                                                                 struct timespec *));
 
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        int                                             (*close)();
 
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        int                                             (*fcntl)();
 
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        int                                             (*writev) __P_((union fd_data, int,
 
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                                                                                   const struct iovec *,
 
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                                                                                   int, struct timespec *));
 
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        int                                             (*readv) __P_((union fd_data, int,
 
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                                                                                  const struct iovec *,
 
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                                                                                  int, struct timespec *));
 
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        off_t                                   (*seek)();
 
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        int                                             use_kfds;
 
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};
 
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struct fd_table_entry {
 
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        struct pthread_queue    r_queue;
 
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        struct pthread_queue    w_queue;
 
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        struct pthread                  *r_owner;
 
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        struct pthread                  *w_owner;
 
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        pthread_mutex_t                 mutex;
 
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        struct fd_table_entry   *next;
 
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        struct fd_ops                   *ops;
 
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        enum fd_type                    type;
 
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        int                                             r_lockcount;            /* Count for FILE read locks */
 
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        int                                             w_lockcount;            /* Count for FILE write locks */
 
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        int                                             count;
 
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        /* data that needs to be passed to the type dependent fd */
 
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        int                                             flags;
 
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        union fd_data                   fd;
 
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};
 
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/*
 
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 * Globals
 
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 */
 
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#if defined(PTHREAD_KERNEL)
 
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extern struct fd_table_entry **fd_table;
 
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extern int dtablesize;
 
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#endif
 
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/*
 
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 * New functions
 
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 */
 
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__BEGIN_DECLS
 
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#if defined(PTHREAD_KERNEL)
 
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#endif
 
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__END_DECLS