libcounter/smp.h

   1 #ifndef _LIBCOUNTER_SMP_H
   2 #define _LIBCOUNTER_SMP_H
   3
   4 /*
   5  * libcounter/smp.h
   6  *
   7  * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; only
  12  * version 2.1 of the License.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #include "helper.h"
  25
  26 /*
  27  * 4kB of per-cpu data available.
  28  */
  29 #define LTTNG_COUNTER_PER_CPU_MEM_SIZE  4096
  30
  31 LTTNG_HIDDEN
  32 extern int __lttng_counter_num_possible_cpus;
  33 LTTNG_HIDDEN
  34 extern void _lttng_counter_get_num_possible_cpus(void);
  35
  36 static inline
  37 int lttng_counter_num_possible_cpus(void)
  38 {
  39         if (!__lttng_counter_num_possible_cpus)
  40                 _lttng_counter_get_num_possible_cpus();
  41         return __lttng_counter_num_possible_cpus;
  42 }
  43
  44 #define lttng_counter_for_each_possible_cpu(cpu)                \
  45         for ((cpu) = 0; (cpu) < lttng_counter_num_possible_cpus(); (cpu)++)
  46
  47 #endif /* _LIBCOUNTER_SMP_H */