Cleanup: enable signed/unsigned compare compiler warning
[urcu.git] / src / urcu-utils.h
1 #ifndef _URCU_UTILS_H
2 #define _URCU_UTILS_H
3
4 /*
5 * urcu-utils.h
6 *
7 * Userspace RCU library internal utils
8 *
9 * Copyright (c) 2018 Michael Jeanson <mjeanson@efficios.com>
10 *
11 * This library is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Lesser General Public
13 * License as published by the Free Software Foundation; either
14 * version 2.1 of the License, or (at your option) any later version.
15 *
16 * This library is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with this library; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 */
25
26 #define urcu_stringify(a) _urcu_stringify(a)
27 #define _urcu_stringify(a) #a
28
29 #define max_t(type, x, y) \
30 ({ \
31 type __max1 = (x); \
32 type __max2 = (y); \
33 __max1 > __max2 ? __max1: __max2; \
34 })
35
36 #define min_t(type, x, y) \
37 ({ \
38 type __min1 = (x); \
39 type __min2 = (y); \
40 __min1 <= __min2 ? __min1: __min2; \
41 })
42
43 /* There is no concept of symbol aliases on MacOS */
44 #ifdef __APPLE__
45 #define URCU_ATTR_ALIAS(x)
46 #else
47 #define URCU_ATTR_ALIAS(x) __attribute__((alias(x)))
48 #endif
49
50 #ifdef CONFIG_RCU_TLS
51 #define DEFINE_URCU_TLS_ALIAS_1(type, name, alias) \
52 URCU_ATTR_ALIAS(#name) \
53 extern type alias
54
55 #else
56 #define DEFINE_URCU_TLS_ALIAS_1(type, name, alias) \
57 URCU_ATTR_ALIAS("*__tls_access_" #name) \
58 type *__tls_access_ ## alias()
59 #endif
60
61 #define DEFINE_URCU_TLS_ALIAS(type, name, alias) \
62 DEFINE_URCU_TLS_ALIAS_1(type, name, alias)
63
64 #endif /* _URCU_UTILS_H */
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