[lttng-ust.git] / liblttng-ust / clock.h

/*
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 * Copyright (C) 2010 Pierre-Marc Fournier
 * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

#ifndef _UST_CLOCK_H
#define _UST_CLOCK_H

#include <time.h>
#include <sys/time.h>
#include <stdint.h>
#include <stddef.h>
#include <stdio.h>
#include <urcu/system.h>
#include <urcu/arch.h>
#include <lttng/ust-clock.h>

#include "lttng-ust-uuid.h"

struct lttng_trace_clock {
	uint64_t (*read64)(void);
	uint64_t (*freq)(void);
	int (*uuid)(char *uuid);
	const char *(*name)(void);
	const char *(*description)(void);
};

extern struct lttng_trace_clock *lttng_trace_clock;

void lttng_ust_clock_init(void);

/* Use the kernel MONOTONIC clock. */

static __inline__
uint64_t trace_clock_read64_monotonic(void)
{
	struct timespec ts;

	if (caa_unlikely(clock_gettime(CLOCK_MONOTONIC, &ts))) {
		ts.tv_sec = 0;
		ts.tv_nsec = 0;
	}
	return ((uint64_t) ts.tv_sec * 1000000000ULL) + ts.tv_nsec;
}

static __inline__
uint64_t trace_clock_read64(void)
{
	struct lttng_trace_clock *ltc = CMM_LOAD_SHARED(lttng_trace_clock);

	if (caa_likely(!ltc)) {
		return trace_clock_read64_monotonic();
	} else {
		cmm_read_barrier_depends();	/* load ltc before content */
		return ltc->read64();
	}
}

#endif /* _UST_CLOCK_H */
Commit	Line	Data
	1	/*
	2	* SPDX-License-Identifier: LGPL-2.1-only
	3	*
	4	* Copyright (C) 2010 Pierre-Marc Fournier
	5	* Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	6	*/
	7
	8	#ifndef _UST_CLOCK_H
	9	#define _UST_CLOCK_H
	10
	11	#include <time.h>
	12	#include <sys/time.h>
	13	#include <stdint.h>
	14	#include <stddef.h>
	15	#include <stdio.h>
	16	#include <urcu/system.h>
	17	#include <urcu/arch.h>
	18	#include <lttng/ust-clock.h>
	19
	20	#include "lttng-ust-uuid.h"
	21
	22	struct lttng_trace_clock {
	23	uint64_t (*read64)(void);
	24	uint64_t (*freq)(void);
	25	int (uuid)(char uuid);
	26	const char (name)(void);
	27	const char (description)(void);
	28	};
	29
	30	extern struct lttng_trace_clock *lttng_trace_clock;
	31
	32	void lttng_ust_clock_init(void);
	33
	34	/* Use the kernel MONOTONIC clock. */
	35
	36	static __inline__
	37	uint64_t trace_clock_read64_monotonic(void)
	38	{
	39	struct timespec ts;
	40
	41	if (caa_unlikely(clock_gettime(CLOCK_MONOTONIC, &ts))) {
	42	ts.tv_sec = 0;
	43	ts.tv_nsec = 0;
	44	}
	45	return ((uint64_t) ts.tv_sec * 1000000000ULL) + ts.tv_nsec;
	46	}
	47
	48	static __inline__
	49	uint64_t trace_clock_read64(void)
	50	{
	51	struct lttng_trace_clock *ltc = CMM_LOAD_SHARED(lttng_trace_clock);
	52
	53	if (caa_likely(!ltc)) {
	54	return trace_clock_read64_monotonic();
	55	} else {
	56	cmm_read_barrier_depends(); /* load ltc before content */
	57	return ltc->read64();
	58	}
	59	}
	60
	61	#endif /* _UST_CLOCK_H */