| 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 | |
| 18 | #ifndef UST_CORE_H |
| 19 | #define UST_CORE_H |
| 20 | |
| 21 | #include <sys/types.h> |
| 22 | #include <ust/config.h> |
| 23 | |
| 24 | #define likely(x) __builtin_expect(!!(x), 1) |
| 25 | #define unlikely(x) __builtin_expect(!!(x), 0) |
| 26 | |
| 27 | /* ARRAYS */ |
| 28 | |
| 29 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) |
| 30 | |
| 31 | |
| 32 | /* ALIGNMENT SHORTCUTS */ |
| 33 | |
| 34 | #include <unistd.h> |
| 35 | |
| 36 | #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) |
| 37 | #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) |
| 38 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) |
| 39 | #define PAGE_SIZE sysconf(_SC_PAGE_SIZE) |
| 40 | #define PAGE_MASK (~(PAGE_SIZE-1)) |
| 41 | |
| 42 | /* ERROR OPS */ |
| 43 | #define MAX_ERRNO 4095 |
| 44 | |
| 45 | #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO) |
| 46 | |
| 47 | static inline void *ERR_PTR(long error) |
| 48 | { |
| 49 | return (void *) error; |
| 50 | } |
| 51 | |
| 52 | static inline long PTR_ERR(const void *ptr) |
| 53 | { |
| 54 | return (long) ptr; |
| 55 | } |
| 56 | |
| 57 | static inline long IS_ERR(const void *ptr) |
| 58 | { |
| 59 | return IS_ERR_VALUE((unsigned long)ptr); |
| 60 | } |
| 61 | |
| 62 | |
| 63 | /* Min / Max */ |
| 64 | |
| 65 | #define min_t(type, x, y) ({ \ |
| 66 | type __min1 = (x); \ |
| 67 | type __min2 = (y); \ |
| 68 | __min1 < __min2 ? __min1: __min2; }) |
| 69 | |
| 70 | #define max_t(type, x, y) ({ \ |
| 71 | type __max1 = (x); \ |
| 72 | type __max2 = (y); \ |
| 73 | __max1 > __max2 ? __max1: __max2; }) |
| 74 | |
| 75 | |
| 76 | /* MUTEXES */ |
| 77 | |
| 78 | #include <pthread.h> |
| 79 | |
| 80 | #define DEFINE_MUTEX(m) pthread_mutex_t (m) = PTHREAD_MUTEX_INITIALIZER; |
| 81 | #define DECLARE_MUTEX(m) extern pthread_mutex_t (m); |
| 82 | |
| 83 | /* MALLOCATION */ |
| 84 | |
| 85 | #include <stdlib.h> |
| 86 | |
| 87 | static inline |
| 88 | void *zmalloc(size_t len) |
| 89 | { |
| 90 | return calloc(1, len); |
| 91 | } |
| 92 | |
| 93 | static inline |
| 94 | void *malloc_align(size_t len) |
| 95 | { |
| 96 | return malloc(ALIGN(len, CAA_CACHE_LINE_SIZE)); |
| 97 | } |
| 98 | |
| 99 | static inline |
| 100 | void *zmalloc_align(size_t len) |
| 101 | { |
| 102 | return calloc(1, ALIGN(len, CAA_CACHE_LINE_SIZE)); |
| 103 | } |
| 104 | |
| 105 | /* MATH */ |
| 106 | |
| 107 | #include <ust/processor.h> |
| 108 | static inline unsigned int hweight32(unsigned int w) |
| 109 | { |
| 110 | unsigned int res = w - ((w >> 1) & 0x55555555); |
| 111 | res = (res & 0x33333333) + ((res >> 2) & 0x33333333); |
| 112 | res = (res + (res >> 4)) & 0x0F0F0F0F; |
| 113 | res = res + (res >> 8); |
| 114 | return (res + (res >> 16)) & 0x000000FF; |
| 115 | } |
| 116 | |
| 117 | static __inline__ int get_count_order(unsigned int count) |
| 118 | { |
| 119 | int order; |
| 120 | |
| 121 | order = fls(count) - 1; |
| 122 | if (count & (count - 1)) |
| 123 | order++; |
| 124 | return order; |
| 125 | } |
| 126 | |
| 127 | #define _ust_container_of(ptr, type, member) ({ \ |
| 128 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ |
| 129 | (type *)( (char *)__mptr - offsetof(type,member) );}) |
| 130 | |
| 131 | #ifndef inline_memcpy |
| 132 | #define inline_memcpy memcpy |
| 133 | #endif |
| 134 | |
| 135 | #ifndef __same_type |
| 136 | #define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b)) |
| 137 | #endif |
| 138 | |
| 139 | #endif /* UST_CORE_H */ |