[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 "ust-helper.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

LTTNG_HIDDEN
extern int __num_possible_cpus;
LTTNG_HIDDEN
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
	1	/*
	2	* SPDX-License-Identifier: LGPL-2.1-only
	3	*
	4	* Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	5	*/
	6
	7	#ifndef _LIBRINGBUFFER_SMP_H
	8	#define _LIBRINGBUFFER_SMP_H
	9
	10	#include "ust-helper.h"
	11	#include "getcpu.h"
	12
	13	/*
	14	* 4kB of per-cpu data available. Enough to hold the control structures,
	15	* but not ring buffers.
	16	*/
	17	#define PER_CPU_MEM_SIZE 4096
	18
	19	LTTNG_HIDDEN
	20	extern int __num_possible_cpus;
	21	LTTNG_HIDDEN
	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 */