libcounter/smp.h

   1 /*
   2  * SPDX-License-Identifier: LGPL-2.1-only
   3  *
   4  * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  */
   6
   7 #ifndef _LIBCOUNTER_SMP_H
   8 #define _LIBCOUNTER_SMP_H
   9
  10 #include "helper.h"
  11
  12 /*
  13  * 4kB of per-cpu data available.
  14  */
  15 #define LTTNG_COUNTER_PER_CPU_MEM_SIZE  4096
  16
  17 LTTNG_HIDDEN
  18 extern int __lttng_counter_num_possible_cpus;
  19 LTTNG_HIDDEN
  20 extern void _lttng_counter_get_num_possible_cpus(void);
  21
  22 static inline
  23 int lttng_counter_num_possible_cpus(void)
  24 {
  25         if (!__lttng_counter_num_possible_cpus)
  26                 _lttng_counter_get_num_possible_cpus();
  27         return __lttng_counter_num_possible_cpus;
  28 }
  29
  30 #define lttng_counter_for_each_possible_cpu(cpu)                \
  31         for ((cpu) = 0; (cpu) < lttng_counter_num_possible_cpus(); (cpu)++)
  32
  33 #endif /* _LIBCOUNTER_SMP_H */