projects / lttng-ust.git / blame
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| 4fbf9cd1 MD |
1 | #ifndef UST_CORE_H |
| 2 | #define UST_CORE_H | |
| 3 | ||
| 4 | /* | |
| 5 | * Copyright (C) 2010 Pierre-Marc Fournier | |
| b5234c06 | 6 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
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7 | * |
| 8 | * This library is free software; you can redistribute it and/or | |
| 9 | * modify it under the terms of the GNU Lesser General Public | |
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10 | * License as published by the Free Software Foundation; version 2.1 of |
| 11 | * the License. | |
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12 | * |
| 13 | * This library is distributed in the hope that it will be useful, | |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 16 | * Lesser General Public License for more details. | |
| 17 | * | |
| 18 | * You should have received a copy of the GNU Lesser General Public | |
| 19 | * License along with this library; if not, write to the Free Software | |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 21 | */ | |
| 22 | ||
| 518d7abb | 23 | #include <sys/types.h> |
| 4318ae1b | 24 | #include <lttng/config.h> |
| a6352fd4 | 25 | #include <urcu/arch.h> |
| b5a3dfa5 | 26 | #include <urcu/compiler.h> |
| 518d7abb | 27 | |
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28 | /* ARRAYS */ |
| 29 | ||
| 30 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) | |
| 31 | ||
| 32 | ||
| 33 | /* ALIGNMENT SHORTCUTS */ | |
| 34 | ||
| 35 | #include <unistd.h> | |
| 36 | ||
| 37 | #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) | |
| 38 | #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) | |
| 39 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) | |
| 40 | #define PAGE_SIZE sysconf(_SC_PAGE_SIZE) | |
| 41 | #define PAGE_MASK (~(PAGE_SIZE-1)) | |
| 42 | ||
| 43 | /* ERROR OPS */ | |
| 44 | #define MAX_ERRNO 4095 | |
| 45 | ||
| b5a3dfa5 | 46 | #define IS_ERR_VALUE(x) caa_unlikely((x) >= (unsigned long)-MAX_ERRNO) |
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47 | |
| 48 | static inline void *ERR_PTR(long error) | |
| 49 | { | |
| 50 | return (void *) error; | |
| 51 | } | |
| 52 | ||
| 53 | static inline long PTR_ERR(const void *ptr) | |
| 54 | { | |
| 55 | return (long) ptr; | |
| 56 | } | |
| 57 | ||
| 58 | static inline long IS_ERR(const void *ptr) | |
| 59 | { | |
| 60 | return IS_ERR_VALUE((unsigned long)ptr); | |
| 61 | } | |
| 62 | ||
| 63 | ||
| 64 | /* Min / Max */ | |
| 65 | ||
| 66 | #define min_t(type, x, y) ({ \ | |
| 67 | type __min1 = (x); \ | |
| 68 | type __min2 = (y); \ | |
| 69 | __min1 < __min2 ? __min1: __min2; }) | |
| 70 | ||
| 71 | #define max_t(type, x, y) ({ \ | |
| 72 | type __max1 = (x); \ | |
| 73 | type __max2 = (y); \ | |
| 74 | __max1 > __max2 ? __max1: __max2; }) | |
| 75 | ||
| 76 | ||
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77 | /* MALLOCATION */ |
| 78 | ||
| 14641deb MD |
79 | #include <stdlib.h> |
| 80 | ||
| 81 | static inline | |
| 82 | void *zmalloc(size_t len) | |
| 83 | { | |
| 84 | return calloc(1, len); | |
| 85 | } | |
| 86 | ||
| 87 | static inline | |
| 88 | void *malloc_align(size_t len) | |
| 89 | { | |
| 90 | return malloc(ALIGN(len, CAA_CACHE_LINE_SIZE)); | |
| 91 | } | |
| 92 | ||
| 93 | static inline | |
| 94 | void *zmalloc_align(size_t len) | |
| 95 | { | |
| 96 | return calloc(1, ALIGN(len, CAA_CACHE_LINE_SIZE)); | |
| 97 | } | |
| 518d7abb | 98 | |
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99 | /* MATH */ |
| 100 | ||
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101 | static inline unsigned int hweight32(unsigned int w) |
| 102 | { | |
| 103 | unsigned int res = w - ((w >> 1) & 0x55555555); | |
| 104 | res = (res & 0x33333333) + ((res >> 2) & 0x33333333); | |
| 105 | res = (res + (res >> 4)) & 0x0F0F0F0F; | |
| 106 | res = res + (res >> 8); | |
| 107 | return (res + (res >> 16)) & 0x000000FF; | |
| 108 | } | |
| 109 | ||
| 12e81b07 | 110 | #endif /* UST_CORE_H */ |