exec/quorum.h

   1 /*
   2  * Copyright (c) 2008-2012 Red Hat, Inc.
   3  *
   4  * All rights reserved.
   5  *
   6  * Author: Christine Caulfield (ccaulfie@redhat.com)
   7  *
   8  * This software licensed under BSD license, the text of which follows:
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions are met:
  12  *
  13  * - Redistributions of source code must retain the above copyright notice,
  14  *   this list of conditions and the following disclaimer.
  15  * - Redistributions in binary form must reproduce the above copyright notice,
  16  *   this list of conditions and the following disclaimer in the documentation
  17  *   and/or other materials provided with the distribution.
  18  * - Neither the name of the Red Hat, Inc. nor the names of its
  19  *   contributors may be used to endorse or promote products derived from this
  20  *   software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  23  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #ifndef QUORUM_H_DEFINED
  36 #define QUORUM_H_DEFINED
  37
  38 struct memb_ring_id;
  39
  40 typedef void (*quorum_callback_fn_t) (int quorate, void *context);
  41
  42 typedef void (*quorum_set_quorate_fn_t) (const unsigned int *view_list,
  43                                          size_t view_list_entries,
  44                                          int quorate, struct memb_ring_id *);
  45
  46 struct quorum_callin_functions
  47 {
  48         int (*quorate) (void);
  49         int (*register_callback) (quorum_callback_fn_t, void*);
  50         int (*unregister_callback) (quorum_callback_fn_t, void*);
  51 };
  52
  53 extern int corosync_quorum_is_quorate (void);
  54
  55 extern int corosync_quorum_register_callback (quorum_callback_fn_t fn, void *context);
  56
  57 extern int corosync_quorum_unregister_callback (quorum_callback_fn_t fn, void *context);
  58
  59 extern int corosync_quorum_initialize (struct quorum_callin_functions *fns);
  60
  61
  62 extern int quorum_none(void);
  63
  64
  65 #endif /* QUORUM_H_DEFINED */