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1 | /* Copyright (C) 2010 Pierre-Marc Fournier |
2 | * | |
3 | * This library is free software; you can redistribute it and/or | |
4 | * modify it under the terms of the GNU Lesser General Public | |
5 | * License as published by the Free Software Foundation; either | |
6 | * version 2.1 of the License, or (at your option) any later version. | |
7 | * | |
8 | * This library is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * Lesser General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU Lesser General Public | |
14 | * License along with this library; if not, write to the Free Software | |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
16 | */ | |
17 | ||
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18 | #ifndef UST_CORE_H |
19 | #define UST_CORE_H | |
20 | ||
518d7abb | 21 | #include <sys/types.h> |
2699970a | 22 | #include <ust/config.h> |
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23 | |
24 | #define likely(x) __builtin_expect(!!(x), 1) | |
25 | #define unlikely(x) __builtin_expect(!!(x), 0) | |
26 | ||
2699970a | 27 | #ifndef HAVE_EFFICIENT_UNALIGNED_ACCESS |
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28 | |
29 | /* | |
30 | * Calculate the offset needed to align the type. | |
31 | * size_of_type must be non-zero. | |
32 | */ | |
33 | static inline unsigned int ltt_align(size_t align_drift, size_t size_of_type) | |
34 | { | |
35 | size_t alignment = min(sizeof(void *), size_of_type); | |
36 | return (alignment - align_drift) & (alignment - 1); | |
37 | } | |
38 | /* Default arch alignment */ | |
39 | #define LTT_ALIGN | |
40 | ||
41 | static inline int ltt_get_alignment(void) | |
42 | { | |
43 | return sizeof(void *); | |
44 | } | |
45 | ||
2699970a | 46 | #else /* HAVE_EFFICIENT_UNALIGNED_ACCESS */ |
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47 | |
48 | static inline unsigned int ltt_align(size_t align_drift, | |
49 | size_t size_of_type) | |
50 | { | |
51 | return 0; | |
52 | } | |
53 | ||
54 | #define LTT_ALIGN __attribute__((packed)) | |
55 | ||
56 | static inline int ltt_get_alignment(void) | |
57 | { | |
58 | return 0; | |
59 | } | |
2699970a | 60 | #endif /* HAVE_EFFICIENT_UNALIGNED_ACCESS */ |
12e81b07 | 61 | |
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62 | |
63 | /* ARRAYS */ | |
64 | ||
65 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) | |
66 | ||
67 | ||
68 | /* ALIGNMENT SHORTCUTS */ | |
69 | ||
70 | #include <unistd.h> | |
71 | ||
72 | #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) | |
73 | #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) | |
74 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) | |
75 | #define PAGE_SIZE sysconf(_SC_PAGE_SIZE) | |
76 | #define PAGE_MASK (~(PAGE_SIZE-1)) | |
77 | ||
78 | /* ERROR OPS */ | |
79 | #define MAX_ERRNO 4095 | |
80 | ||
81 | #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO) | |
82 | ||
83 | static inline void *ERR_PTR(long error) | |
84 | { | |
85 | return (void *) error; | |
86 | } | |
87 | ||
88 | static inline long PTR_ERR(const void *ptr) | |
89 | { | |
90 | return (long) ptr; | |
91 | } | |
92 | ||
93 | static inline long IS_ERR(const void *ptr) | |
94 | { | |
95 | return IS_ERR_VALUE((unsigned long)ptr); | |
96 | } | |
97 | ||
98 | ||
99 | /* Min / Max */ | |
100 | ||
101 | #define min_t(type, x, y) ({ \ | |
102 | type __min1 = (x); \ | |
103 | type __min2 = (y); \ | |
104 | __min1 < __min2 ? __min1: __min2; }) | |
105 | ||
106 | #define max_t(type, x, y) ({ \ | |
107 | type __max1 = (x); \ | |
108 | type __max2 = (y); \ | |
109 | __max1 > __max2 ? __max1: __max2; }) | |
110 | ||
111 | ||
112 | /* MUTEXES */ | |
113 | ||
114 | #include <pthread.h> | |
115 | ||
116 | #define DEFINE_MUTEX(m) pthread_mutex_t (m) = PTHREAD_MUTEX_INITIALIZER; | |
117 | #define DECLARE_MUTEX(m) extern pthread_mutex_t (m); | |
118 | ||
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119 | /* MALLOCATION */ |
120 | ||
121 | #define zmalloc(s) calloc(1, s) | |
122 | ||
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123 | /* MATH */ |
124 | ||
125 | #include <ust/processor.h> | |
126 | static inline unsigned int hweight32(unsigned int w) | |
127 | { | |
128 | unsigned int res = w - ((w >> 1) & 0x55555555); | |
129 | res = (res & 0x33333333) + ((res >> 2) & 0x33333333); | |
130 | res = (res + (res >> 4)) & 0x0F0F0F0F; | |
131 | res = res + (res >> 8); | |
132 | return (res + (res >> 16)) & 0x000000FF; | |
133 | } | |
134 | ||
135 | static __inline__ int get_count_order(unsigned int count) | |
136 | { | |
137 | int order; | |
138 | ||
139 | order = fls(count) - 1; | |
140 | if (count & (count - 1)) | |
141 | order++; | |
142 | return order; | |
143 | } | |
144 | ||
1e4b909b | 145 | #define _ust_container_of(ptr, type, member) ({ \ |
518d7abb PMF |
146 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ |
147 | (type *)( (char *)__mptr - offsetof(type,member) );}) | |
148 | ||
12e81b07 | 149 | #endif /* UST_CORE_H */ |