| 1 | #ifndef UST_CORE_H |
| 2 | #define UST_CORE_H |
| 3 | |
| 4 | /* |
| 5 | * Copyright (C) 2010 Pierre-Marc Fournier |
| 6 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 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 |
| 10 | * License as published by the Free Software Foundation; version 2.1 of |
| 11 | * the License. |
| 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 | |
| 23 | #include <sys/types.h> |
| 24 | #include <lttng/config.h> |
| 25 | #include <urcu/arch.h> |
| 26 | #include <urcu/compiler.h> |
| 27 | |
| 28 | /* ALIGNMENT SHORTCUTS */ |
| 29 | |
| 30 | #include <unistd.h> |
| 31 | |
| 32 | #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) |
| 33 | #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) |
| 34 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) |
| 35 | #define PAGE_SIZE sysconf(_SC_PAGE_SIZE) |
| 36 | #define PAGE_MASK (~(PAGE_SIZE-1)) |
| 37 | |
| 38 | /* Min / Max */ |
| 39 | |
| 40 | #define min_t(type, x, y) ({ \ |
| 41 | type __min1 = (x); \ |
| 42 | type __min2 = (y); \ |
| 43 | __min1 < __min2 ? __min1: __min2; }) |
| 44 | |
| 45 | #define max_t(type, x, y) ({ \ |
| 46 | type __max1 = (x); \ |
| 47 | type __max2 = (y); \ |
| 48 | __max1 > __max2 ? __max1: __max2; }) |
| 49 | |
| 50 | |
| 51 | /* MALLOCATION */ |
| 52 | |
| 53 | #include <stdlib.h> |
| 54 | |
| 55 | static inline |
| 56 | void *zmalloc(size_t len) |
| 57 | { |
| 58 | return calloc(1, len); |
| 59 | } |
| 60 | |
| 61 | static inline |
| 62 | void *malloc_align(size_t len) |
| 63 | { |
| 64 | return malloc(ALIGN(len, CAA_CACHE_LINE_SIZE)); |
| 65 | } |
| 66 | |
| 67 | static inline |
| 68 | void *zmalloc_align(size_t len) |
| 69 | { |
| 70 | return calloc(1, ALIGN(len, CAA_CACHE_LINE_SIZE)); |
| 71 | } |
| 72 | |
| 73 | /* MATH */ |
| 74 | |
| 75 | static inline unsigned int hweight32(unsigned int w) |
| 76 | { |
| 77 | unsigned int res = w - ((w >> 1) & 0x55555555); |
| 78 | res = (res & 0x33333333) + ((res >> 2) & 0x33333333); |
| 79 | res = (res + (res >> 4)) & 0x0F0F0F0F; |
| 80 | res = res + (res >> 8); |
| 81 | return (res + (res >> 16)) & 0x000000FF; |
| 82 | } |
| 83 | |
| 84 | #endif /* UST_CORE_H */ |