#include <stdint.h>
#include <stddef.h>
#include <stdio.h>
-#include "uuid.h"
+#include <urcu/system.h>
+#include <urcu/arch.h>
+#include <lttng/ust-clock.h>
-/* TRACE CLOCK */
+#include "lttng-ust-uuid.h"
-/*
- * Currently using the kernel MONOTONIC clock, waiting for kernel-side
- * LTTng to implement mmap'd 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;
-/* Choosing correct trace clock */
+void lttng_ust_clock_init(void);
+
+/* Use the kernel MONOTONIC 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 (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_freq(void)
+uint64_t trace_clock_freq_monotonic(void)
{
return 1000000000ULL;
}
static __inline__
-const int trace_clock_uuid(char *uuid)
+int trace_clock_uuid_monotonic(char *uuid)
{
int ret = 0;
size_t len;
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 */