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

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

#ifndef _LIBCOUNTER_SMP_H
#define _LIBCOUNTER_SMP_H

/*
 * 4kB of per-cpu data available.
 */
#define LTTNG_COUNTER_PER_CPU_MEM_SIZE	4096

__attribute__((visibility("hidden")))
extern int __lttng_counter_num_possible_cpus;

__attribute__((visibility("hidden")))
extern void _lttng_counter_get_num_possible_cpus(void);

static inline
int lttng_counter_num_possible_cpus(void)
{
	if (!__lttng_counter_num_possible_cpus)
		_lttng_counter_get_num_possible_cpus();
	return __lttng_counter_num_possible_cpus;
}

#define lttng_counter_for_each_possible_cpu(cpu)		\
	for ((cpu) = 0; (cpu) < lttng_counter_num_possible_cpus(); (cpu)++)

#endif /* _LIBCOUNTER_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 _LIBCOUNTER_SMP_H
	8	#define _LIBCOUNTER_SMP_H
	9
	10	/*
	11	* 4kB of per-cpu data available.
	12	*/
	13	#define LTTNG_COUNTER_PER_CPU_MEM_SIZE 4096
	14
	15	__attribute__((visibility("hidden")))
	16	extern int __lttng_counter_num_possible_cpus;
	17
	18	__attribute__((visibility("hidden")))
	19	extern void _lttng_counter_get_num_possible_cpus(void);
	20
	21	static inline
	22	int lttng_counter_num_possible_cpus(void)
	23	{
	24	if (!__lttng_counter_num_possible_cpus)
	25	_lttng_counter_get_num_possible_cpus();
	26	return __lttng_counter_num_possible_cpus;
	27	}
	28
	29	#define lttng_counter_for_each_possible_cpu(cpu) \
	30	for ((cpu) = 0; (cpu) < lttng_counter_num_possible_cpus(); (cpu)++)
	31
	32	#endif /* _LIBCOUNTER_SMP_H */