projects / lttng-ust.git / blame
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|---|---|---|
| a6352fd4 MD |
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 | ||
| 2b2d6ff7 | 12 | #include "getcpu.h" |
| a6352fd4 MD |
13 | |
| 14 | /* | |
| 15 | * 4kB of per-cpu data available. Enough to hold the control structures, | |
| 16 | * but not ring buffers. | |
| 17 | */ | |
| 18 | #define PER_CPU_MEM_SIZE 4096 | |
| 19 | ||
| 20 | extern int __num_possible_cpus; | |
| 21 | extern void _get_num_possible_cpus(void); | |
| 22 | ||
| 23 | static inline | |
| 24 | int num_possible_cpus(void) | |
| 25 | { | |
| 26 | if (!__num_possible_cpus) | |
| 27 | _get_num_possible_cpus(); | |
| 28 | return __num_possible_cpus; | |
| 29 | } | |
| 30 | ||
| a6352fd4 MD |
31 | #define for_each_possible_cpu(cpu) \ |
| 32 | for ((cpu) = 0; (cpu) < num_possible_cpus(); (cpu)++) | |
| 33 | ||
| 34 | #endif /* _LIBRINGBUFFER_SMP_H */ |