Remove session list lock acquisition of the search
[lttng-tools.git] / include / lttng-share.h
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9bda164d 1/*
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2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9bda164d 4 *
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5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
9bda164d 8 *
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9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
9bda164d 13 *
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14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
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17 */
18
19#ifndef _LTTNG_SHARE_H
20#define _LTTNG_SHARE_H
21
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22#include <stdlib.h>
23
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24#include <lttng/lttng.h>
25
f3ed775e 26/* Default channel attributes */
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27#define DEFAULT_CHANNEL_NAME "channel0"
28#define DEFAULT_CHANNEL_OVERWRITE 0 /* usec */
7d452e12 29/* DEFAULT_CHANNEL_SUBBUF_SIZE must always be a power of 2 */
3817e7df 30#define DEFAULT_CHANNEL_SUBBUF_SIZE 4096 /* bytes */
7d452e12 31/* DEFAULT_CHANNEL_SUBBUF_NUM must always be a power of 2 */
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32#define DEFAULT_CHANNEL_SUBBUF_NUM 8
33#define DEFAULT_CHANNEL_SWITCH_TIMER 0 /* usec */
b389abbe 34#define DEFAULT_CHANNEL_READ_TIMER 200 /* usec */
3817e7df 35#define DEFAULT_CHANNEL_OUTPUT LTTNG_EVENT_MMAP
b389abbe 36
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37#define DEFAULT_METADATA_SUBBUF_SIZE 4096
38#define DEFAULT_METADATA_SUBBUF_NUM 2
e6ddca71 39
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40/* Kernel has different defaults */
41
42/* DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE must always be a power of 2 */
3817e7df 43#define DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE 262144 /* bytes */
b389abbe 44/* DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM must always be a power of 2 */
3817e7df 45#define DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM 4
b389abbe 46/* See lttng-kernel.h enum lttng_kernel_output for channel output */
3817e7df 47#define DEFAULT_KERNEL_CHANNEL_OUTPUT LTTNG_EVENT_SPLICE
f3ed775e 48
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49/* User space defaults */
50
51/* Must be a power of 2 */
52#define DEFAULT_UST_CHANNEL_SUBBUF_SIZE 4096 /* bytes */
53/* Must be a power of 2 */
54#define DEFAULT_UST_CHANNEL_SUBBUF_NUM 4
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55/* See lttng-ust.h enum lttng_ust_output */
56#define DEFAULT_UST_CHANNEL_OUTPUT LTTNG_UST_MMAP
0b0dd29a 57
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58/*
59 * Takes a pointer x and transform it so we can use it to access members
60 * without a function call. Here an example:
61 *
62 * #define GET_SIZE(x) LTTNG_REF(x)->size
63 *
64 * struct { int size; } s;
65 *
66 * printf("size : %d\n", GET_SIZE(&s));
67 *
68 * For this example we can't use something like this for compatibility purpose
69 * since this will fail:
70 *
71 * #define GET_SIZE(x) x->size;
72 *
73 * This is mostly use for the compatibility layer of lttng-tools. See
e848fc76 74 * poll/epoll for a good example. Since x can be on the stack or allocated
5eb91c98 75 * memory using malloc(), we must use generic accessors for compat in order to
e848fc76 76 * *not* use a function to access members and not the variable name.
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77 */
78#define LTTNG_REF(x) ((typeof(*x) *)(x))
79
80/*
81 * Memory allocation zeroed
82 */
83#define zmalloc(x) calloc(1, x)
84
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85#ifndef ARRAY_SIZE
86#define ARRAY_SIZE(array) (sizeof(array) / (sizeof((array)[0])))
87#endif
88
89
9bda164d 90#endif /* _LTTNG_SHARE_H */
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