include/lttng/core.h

   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 /* Min / Max */
  29
  30 #define min_t(type, x, y) ({                    \
  31         type __min1 = (x);                      \
  32         type __min2 = (y);                      \
  33         __min1 < __min2 ? __min1: __min2; })
  34
  35 #define max_t(type, x, y) ({                    \
  36         type __max1 = (x);                      \
  37         type __max2 = (y);                      \
  38         __max1 > __max2 ? __max1: __max2; })
  39
  40
  41 /* MALLOCATION */
  42
  43 #include <stdlib.h>
  44
  45 static inline
  46 void *zmalloc(size_t len)
  47 {
  48         return calloc(1, len);
  49 }
  50
  51 /* MATH */
  52
  53 static inline unsigned int hweight32(unsigned int w)
  54 {
  55         unsigned int res = w - ((w >> 1) & 0x55555555);
  56         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
  57         res = (res + (res >> 4)) & 0x0F0F0F0F;
  58         res = res + (res >> 8);
  59         return (res + (res >> 16)) & 0x000000FF;
  60 }
  61
  62 #endif /* UST_CORE_H */