#include <sys/time.h>
#include <stdint.h>
#include <stddef.h>
-#include <lttng/core.h>
+#include <stdio.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);
-static __inline__ uint64_t trace_clock_read64(void)
+/* Use the kernel MONOTONIC clock. */
+
+static __inline__
+uint64_t trace_clock_read64_monotonic(void)
{
struct timespec ts;
- clock_gettime(CLOCK_MONOTONIC, &ts);
- return (ts.tv_sec * 1000000000) + ts.tv_nsec;
+ 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;
}
-#if __i386__ || __x86_64__
-static __inline__ uint64_t trace_clock_frequency(void)
+static __inline__
+uint64_t trace_clock_read64(void)
{
- return 1000000000LL;
-}
-#endif /* #else #if __i386__ || __x86_64__ */
+ struct lttng_trace_clock *ltc = CMM_LOAD_SHARED(lttng_trace_clock);
-static __inline__ uint32_t trace_clock_freq_scale(void)
-{
- return 1;
+ 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 */