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 /*
  11  * 4kB of per-cpu data available.
  12  */
  13 #define LTTNG_COUNTER_PER_CPU_MEM_SIZE  4096
  14
  15 extern int __lttng_counter_num_possible_cpus
  16         __attribute__((visibility("hidden")));
  17
  18 extern void _lttng_counter_get_num_possible_cpus(void)
  19         __attribute__((visibility("hidden")));
  20
  21 static inline
  22 int lttng_counter_num_possible_cpus(void)
  23 {
  24         if (!__lttng_counter_num_possible_cpus)
  25                 _lttng_counter_get_num_possible_cpus();
  26         return __lttng_counter_num_possible_cpus;
  27 }
  28
  29 #define lttng_counter_for_each_possible_cpu(cpu)                \
  30         for ((cpu) = 0; (cpu) < lttng_counter_num_possible_cpus(); (cpu)++)
  31
  32 #endif /* _LIBCOUNTER_SMP_H */