corosync  3.1.0
schedwrk.c
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1 /*
2  * Copyright (c) 2009-2010 Red Hat, Inc.
3  *
4  * All rights reserved.
5  *
6  * Author: Steven Dake (sdake@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 MontaVista Software, 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 CONTIBUTORS "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 #include <config.h>
36 #include <corosync/totem/totempg.h>
37 #include <corosync/hdb.h>
38 #include "schedwrk.h"
39 
40 static void (*serialize_lock) (void);
41 static void (*serialize_unlock) (void);
42 
43 DECLARE_HDB_DATABASE (schedwrk_instance_database,NULL);
44 
46  int (*schedwrk_fn) (const void *);
47  const void *context;
49  int lock;
50 };
51 
52 static int schedwrk_do (enum totem_callback_token_type type, const void *context)
53 {
54  hdb_handle_t handle = *((hdb_handle_t *)context);
55  struct schedwrk_instance *instance;
56  int res;
57 
58  res = hdb_handle_get (&schedwrk_instance_database,
59  handle,
60  (void *)&instance);
61  if (res != 0) {
62  goto error_exit;
63  }
64 
65  if (instance->lock)
66  serialize_lock ();
67 
68  res = instance->schedwrk_fn (instance->context);
69 
70  if (instance->lock)
71  serialize_unlock ();
72 
73  if (res == 0) {
74  hdb_handle_destroy (&schedwrk_instance_database, handle);
75  }
76  hdb_handle_put (&schedwrk_instance_database, handle);
77  return (res);
78 
79 error_exit:
80  return (-1);
81 }
82 
84  void (*serialize_lock_fn) (void),
85  void (*serialize_unlock_fn) (void))
86 {
87  serialize_lock = serialize_lock_fn;
88  serialize_unlock = serialize_unlock_fn;
89 }
90 
91 static int schedwrk_internal_create (
92  hdb_handle_t *handle,
93  int (schedwrk_fn) (const void *),
94  const void *context,
95  int lock)
96 {
97  struct schedwrk_instance *instance;
98  int res;
99 
100  res = hdb_handle_create (&schedwrk_instance_database,
101  sizeof (struct schedwrk_instance), handle);
102  if (res != 0) {
103  goto error_exit;
104  }
105  res = hdb_handle_get (&schedwrk_instance_database, *handle,
106  (void *)&instance);
107  if (res != 0) {
108  goto error_destroy;
109  }
110 
112  &instance->callback_handle,
114  1,
115  schedwrk_do,
116  handle);
117 
118  instance->schedwrk_fn = schedwrk_fn;
119  instance->context = context;
120  instance->lock = lock;
121 
122  hdb_handle_put (&schedwrk_instance_database, *handle);
123 
124  return (0);
125 
126 error_destroy:
127  hdb_handle_destroy (&schedwrk_instance_database, *handle);
128 
129 error_exit:
130  return (-1);
131 }
132 
133 /*
134  * handle pointer is internally used by totempg_callback_token_create. To make schedwrk work,
135  * handle must be pointer to ether heap or .text or static memory (not stack) which is not
136  * changed by caller.
137  */
139  hdb_handle_t *handle,
140  int (schedwrk_fn) (const void *),
141  const void *context)
142 {
143  return schedwrk_internal_create (handle, schedwrk_fn, context, 1);
144 }
145 
147  hdb_handle_t *handle,
148  int (schedwrk_fn) (const void *),
149  const void *context)
150 {
151  return schedwrk_internal_create (handle, schedwrk_fn, context, 0);
152 }
153 
155 {
156  hdb_handle_destroy (&schedwrk_instance_database, handle);
157 }
Totem Single Ring Protocol.
const void * context
Definition: schedwrk.c:47
void * callback_handle
Definition: schedwrk.c:48
void schedwrk_init(void(*serialize_lock_fn)(void), void(*serialize_unlock_fn)(void))
Definition: schedwrk.c:83
void schedwrk_destroy(hdb_handle_t handle)
Definition: schedwrk.c:154
int schedwrk_create_nolock(hdb_handle_t *handle, int(schedwrk_fn)(const void *), const void *context)
Definition: schedwrk.c:146
qb_handle_t hdb_handle_t
Definition: hdb.h:52
int(* schedwrk_fn)(const void *)
Definition: schedwrk.c:46
int totempg_callback_token_create(void **handle_out, enum totem_callback_token_type type, int delete, int(*callback_fn)(enum totem_callback_token_type type, const void *), const void *data)
Definition: totempg.c:1099
char type
Definition: totem.h:55
DECLARE_HDB_DATABASE(schedwrk_instance_database, NULL)
int schedwrk_create(hdb_handle_t *handle, int(schedwrk_fn)(const void *), const void *context)
Definition: schedwrk.c:138
totem_callback_token_type
The totem_callback_token_type enum.
Definition: coroapi.h:142