1 /* Copyright (C) 2010 Pierre-Marc Fournier
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.
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.
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
21 #include <sys/types.h>
22 #include <ust/config.h>
24 #define likely(x) __builtin_expect(!!(x), 1)
25 #define unlikely(x) __builtin_expect(!!(x), 0)
27 #ifndef HAVE_EFFICIENT_UNALIGNED_ACCESS
30 * Calculate the offset needed to align the type.
31 * size_of_type must be non-zero.
33 static inline unsigned int ltt_align(size_t align_drift
, size_t size_of_type
)
35 size_t alignment
= min(sizeof(void *), size_of_type
);
36 return (alignment
- align_drift
) & (alignment
- 1);
38 /* Default arch alignment */
41 static inline int ltt_get_alignment(void)
43 return sizeof(void *);
46 #else /* HAVE_EFFICIENT_UNALIGNED_ACCESS */
48 static inline unsigned int ltt_align(size_t align_drift
,
54 #define LTT_ALIGN __attribute__((packed))
56 static inline int ltt_get_alignment(void)
60 #endif /* HAVE_EFFICIENT_UNALIGNED_ACCESS */
65 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
68 /* ALIGNMENT SHORTCUTS */
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))
79 #define MAX_ERRNO 4095
81 #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
83 static inline void *ERR_PTR(long error
)
85 return (void *) error
;
88 static inline long PTR_ERR(const void *ptr
)
93 static inline long IS_ERR(const void *ptr
)
95 return IS_ERR_VALUE((unsigned long)ptr
);
101 #define min_t(type, x, y) ({ \
104 __min1 < __min2 ? __min1: __min2; })
106 #define max_t(type, x, y) ({ \
109 __max1 > __max2 ? __max1: __max2; })
116 #define DEFINE_MUTEX(m) pthread_mutex_t (m) = PTHREAD_MUTEX_INITIALIZER;
117 #define DECLARE_MUTEX(m) extern pthread_mutex_t (m);
121 #define zmalloc(s) calloc(1, s)
125 #include <ust/processor.h>
126 static inline unsigned int hweight32(unsigned int w
)
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;
135 static __inline__
int get_count_order(unsigned int count
)
139 order
= fls(count
) - 1;
140 if (count
& (count
- 1))
145 #define _ust_container_of(ptr, type, member) ({ \
146 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
147 (type *)( (char *)__mptr - offsetof(type,member) );})
149 #endif /* UST_CORE_H */
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