[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 <lttng/core.h>
#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
4318ae1b	12	#include <lttng/core.h>
2b2d6ff7	13	#include "getcpu.h"
a6352fd4 MD	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
a6352fd4 MD	32	#define for_each_possible_cpu(cpu) \
	33	for ((cpu) = 0; (cpu) < num_possible_cpus(); (cpu)++)
	34
	35	#endif /* _LIBRINGBUFFER_SMP_H */