libringbuffer/smp.h

   1 #ifndef _LIBRINGBUFFER_SMP_H
   2 #define _LIBRINGBUFFER_SMP_H
   3
   4 /*
   5  * libringbuffer/smp.h
   6  *
   7  * Copyright 2011 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  *
   9  * Dual LGPL v2.1/GPL v2 license.
  10  */
  11
  12 #include <lttng/core.h>
  13 #include "getcpu.h"
  14
  15 /*
  16  * 4kB of per-cpu data available. Enough to hold the control structures,
  17  * but not ring buffers.
  18  */
  19 #define PER_CPU_MEM_SIZE        4096
  20
  21 extern int __num_possible_cpus;
  22 extern void _get_num_possible_cpus(void);
  23
  24 static inline
  25 int num_possible_cpus(void)
  26 {
  27         if (!__num_possible_cpus)
  28                 _get_num_possible_cpus();
  29         return __num_possible_cpus;
  30 }
  31
  32 #define for_each_possible_cpu(cpu)              \
  33         for ((cpu) = 0; (cpu) < num_possible_cpus(); (cpu)++)
  34
  35 #endif /* _LIBRINGBUFFER_SMP_H */