/*
- * 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 <stdio.h>
-#include <errno.h>
+#include <urcu/system.h>
+#include <urcu/arch.h>
+#include <lttng/ust-clock.h>
-#include <common/compat/uuid.h>
+#include <common/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(void)
+uint64_t trace_clock_read64_monotonic(void)
{
struct timespec ts;
- clock_gettime(CLOCK_MONOTONIC, &ts);
+ if (lttng_clock_gettime(CLOCK_MONOTONIC, &ts)) {
+ /* TODO Report error cleanly up the chain. */
+ PERROR("clock_gettime CLOCK_MONOTONIC");
+ ts.tv_sec = 0;
+ ts.tv_nsec = 0;
+ }
return ((uint64_t) ts.tv_sec * 1000000000ULL) + ts.tv_nsec;
}
static __inline__
-uint64_t trace_clock_freq(void)
+uint64_t trace_clock_freq_monotonic(void)
{
return 1000000000ULL;
}
static __inline__
-int trace_clock_uuid(char *uuid)
+int trace_clock_uuid_monotonic(char *uuid)
{
int ret = 0;
size_t len;
if (!fp) {
return -ENOENT;
}
- len = fread(uuid, 1, UUID_STR_LEN - 1, fp);
- if (len < UUID_STR_LEN - 1) {
+ len = fread(uuid, 1, LTTNG_UST_UUID_STR_LEN - 1, fp);
+ if (len < LTTNG_UST_UUID_STR_LEN - 1) {
ret = -EINVAL;
goto end;
}
- uuid[UUID_STR_LEN - 1] = '\0';
+ 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();
+ }
+}
+
+static __inline__
+uint64_t trace_clock_freq(void)
+{
+ struct lttng_trace_clock *ltc = CMM_LOAD_SHARED(lttng_trace_clock);
+
+ if (!ltc) {
+ return trace_clock_freq_monotonic();
+ } else {
+ cmm_read_barrier_depends(); /* load ltc before content */
+ return ltc->freq();
+ }
+}
+
+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);
+ }
+}
+
+static __inline__
+const char *trace_clock_name(void)
+{
+ struct lttng_trace_clock *ltc = CMM_LOAD_SHARED(lttng_trace_clock);
+
+ if (!ltc) {
+ return trace_clock_name_monotonic();
+ } else {
+ cmm_read_barrier_depends(); /* load ltc before content */
+ return ltc->name();
+ }
+}
+
+static __inline__
+const char *trace_clock_description(void)
+{
+ struct lttng_trace_clock *ltc = CMM_LOAD_SHARED(lttng_trace_clock);
+
+ if (!ltc) {
+ return trace_clock_description_monotonic();
+ } else {
+ cmm_read_barrier_depends(); /* load ltc before content */
+ return ltc->description();
+ }
+}
+
#endif /* _UST_CLOCK_H */