dcc3aab6a675561fe41cbe0fe70ae0dbd4713fb8
[lttng-ust.git] / libcounter / shm_internal.h
1 #ifndef _LIBCOUNTER_SHM_INTERNAL_H
2 #define _LIBCOUNTER_SHM_INTERNAL_H
3
4 /*
5 * libcounter/shm_internal.h
6 *
7 * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 *
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; only
12 * version 2.1 of the License.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 struct lttng_counter_shm_ref {
25 volatile ssize_t index; /* within the object table */
26 volatile ssize_t offset; /* within the object */
27 };
28
29 #define DECLARE_LTTNG_COUNTER_SHMP(type, name) \
30 union { \
31 struct lttng_counter_shm_ref _ref; \
32 type *_type; \
33 } name
34
35 #endif /* _LIBCOUNTER_SHM_INTERNAL_H */
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