/*
- * Copyright (C) 2010 Pierre-Marc Fournier
- * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2010 Pierre-Marc Fournier
+ * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; version 2.1 of
- * the License.
+ * SPDX-License-Identifier: GPL-2.0-only
*
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _UST_CLOCK_H
#define _UST_CLOCK_H
-#include <time.h>
+#include <common/compat/time.h>
#include <sys/time.h>
#include <stdint.h>
#include <stddef.h>
#include <urcu/arch.h>
#include <lttng/ust-clock.h>
-#include <common/compat/uuid.h>
-
-/* TRACE CLOCK */
-
-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);
-
-/*
- * Currently using the kernel MONOTONIC clock, waiting for kernel-side
- * LTTng to implement mmap'd trace clock.
- */
-
-/* Choosing correct trace clock */
-
-static __inline__
-uint64_t trace_clock_read64_monotonic(void)
-{
- struct timespec ts;
-
- clock_gettime(CLOCK_MONOTONIC, &ts);
- return ((uint64_t) ts.tv_sec * 1000000000ULL) + ts.tv_nsec;
-}
+#include <common/uuid.h>
static __inline__
-uint64_t trace_clock_freq_monotonic(void)
+uint64_t trace_clock_read64(void)
{
- return 1000000000ULL;
-}
+ uint64_t clock_value = 0;
+ lttng_ust_clock_read64_function read64_cb;
-static __inline__
-int trace_clock_uuid_monotonic(char *uuid)
-{
- int ret = 0;
- size_t len;
- FILE *fp;
-
- /*
- * boot_id needs to be read once before being used concurrently
- * to deal with a Linux kernel race. A fix is proposed for
- * upstream, but the work-around is needed for older kernels.
- */
- fp = fopen("/proc/sys/kernel/random/boot_id", "r");
- if (!fp) {
- return -ENOENT;
- }
- len = fread(uuid, 1, LTTNG_UST_UUID_STR_LEN - 1, fp);
- if (len < LTTNG_UST_UUID_STR_LEN - 1) {
- ret = -EINVAL;
+ if (lttng_ust_trace_clock_get_read64_cb(&read64_cb)) {
goto end;
}
- uuid[LTTNG_UST_UUID_STR_LEN - 1] = '\0';
-end:
- fclose(fp);
- return ret;
-}
-
-static __inline__
-const char *trace_clock_name_monotonic(void)
-{
- return "monotonic";
-}
-static __inline__
-const char *trace_clock_description_monotonic(void)
-{
- return "Monotonic Clock";
-}
-
-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();
- }
+ clock_value = read64_cb();
+end:
+ return clock_value;
}
static __inline__
uint64_t trace_clock_freq(void)
{
- struct lttng_trace_clock *ltc = CMM_LOAD_SHARED(lttng_trace_clock);
+ uint64_t frequency = 0;
+ lttng_ust_clock_freq_function get_freq_cb;
- if (!ltc) {
- return trace_clock_freq_monotonic();
- } else {
- cmm_read_barrier_depends(); /* load ltc before content */
- return ltc->freq();
+ if (lttng_ust_trace_clock_get_freq_cb(&get_freq_cb)) {
+ goto end;
}
+
+ frequency = get_freq_cb();
+end:
+ return frequency;
}
static __inline__
int trace_clock_uuid(char *uuid)
{
- struct lttng_trace_clock *ltc = CMM_LOAD_SHARED(lttng_trace_clock);
-
- cmm_read_barrier_depends(); /* load ltc before content */
- /* Use default UUID cb when NULL */
- if (!ltc || !ltc->uuid) {
- return trace_clock_uuid_monotonic(uuid);
- } else {
- return ltc->uuid(uuid);
+ int ret;
+ lttng_ust_clock_uuid_function get_uuid_cb;
+
+ if (lttng_ust_trace_clock_get_uuid_cb(&get_uuid_cb)) {
+ ret = -EINVAL;
+ goto end;
}
+
+ ret = get_uuid_cb(uuid);
+end:
+ return ret;
+
}
static __inline__
const char *trace_clock_name(void)
{
- struct lttng_trace_clock *ltc = CMM_LOAD_SHARED(lttng_trace_clock);
+ const char *name;
+ lttng_ust_clock_name_function get_name_cb;
- if (!ltc) {
- return trace_clock_name_monotonic();
- } else {
- cmm_read_barrier_depends(); /* load ltc before content */
- return ltc->name();
+ if (lttng_ust_trace_clock_get_name_cb(&get_name_cb)) {
+ name = NULL;
+ goto end;
}
+
+ name = get_name_cb();
+end:
+ return name;
}
static __inline__
const char *trace_clock_description(void)
{
- struct lttng_trace_clock *ltc = CMM_LOAD_SHARED(lttng_trace_clock);
+ const char *description;
+ lttng_ust_clock_description_function get_description_cb;
- if (!ltc) {
- return trace_clock_description_monotonic();
- } else {
- cmm_read_barrier_depends(); /* load ltc before content */
- return ltc->description();
+ if (lttng_ust_trace_clock_get_description_cb(&get_description_cb)) {
+ description = NULL;
+ goto end;
}
+
+ description = get_description_cb();
+end:
+ return description;
}
#endif /* _UST_CLOCK_H */