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

/*
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

#ifndef _LIBRINGBUFFER_SMP_H
#define _LIBRINGBUFFER_SMP_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	1	/*
c0c0989a	2	* SPDX-License-Identifier: LGPL-2.1-only
a6352fd4	3	*
e92f3e28	4	* Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
a6352fd4 MD	5	*/
a6352fd4 MD	6
c0c0989a MJ	7	#ifndef _LIBRINGBUFFER_SMP_H
	8	#define _LIBRINGBUFFER_SMP_H
	9
2b2d6ff7	10	#include "getcpu.h"
a6352fd4 MD	11
	12	/*
	13	* 4kB of per-cpu data available. Enough to hold the control structures,
	14	* but not ring buffers.
	15	*/
	16	#define PER_CPU_MEM_SIZE 4096
	17
	18	extern int __num_possible_cpus;
	19	extern void _get_num_possible_cpus(void);
	20
	21	static inline
	22	int num_possible_cpus(void)
	23	{
	24	if (!__num_possible_cpus)
	25	_get_num_possible_cpus();
	26	return __num_possible_cpus;
	27	}
	28
a6352fd4 MD	29	#define for_each_possible_cpu(cpu) \
	30	for ((cpu) = 0; (cpu) < num_possible_cpus(); (cpu)++)
	31
	32	#endif /* _LIBRINGBUFFER_SMP_H */