[lttng-ust.git] / libringbuffer / smp.h

#ifndef _LIBRINGBUFFER_SMP_H
#define _LIBRINGBUFFER_SMP_H

/*
 * libringbuffer/smp.h
 *
 * Copyright 2011 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * Dual LGPL v2.1/GPL v2 license.
 */

#include "getcpu.h"

/*
 * 4kB of per-cpu data available. Enough to hold the control structures,
 * but not ring buffers.
 */
#define PER_CPU_MEM_SIZE	4096

extern int __num_possible_cpus;
extern void _get_num_possible_cpus(void);

static inline
int num_possible_cpus(void)
{
	if (!__num_possible_cpus)
		_get_num_possible_cpus();
	return __num_possible_cpus;
}

#define for_each_possible_cpu(cpu)		\
	for ((cpu) = 0; (cpu) < num_possible_cpus(); (cpu)++)

#endif /* _LIBRINGBUFFER_SMP_H */
Commit	Line	Data
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 */