#include <stdint.h>
#include <stddef.h>
#include <stdio.h>
+#include <urcu/system.h>
+#include <urcu/arch.h>
+#include <lttng/ust-clock.h>
-/*
- * Includes final \0.
- */
-#define CLOCK_UUID_LEN 37
+#include "lttng-ust-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);
+};
-/*
- * Currently using the kernel MONOTONIC clock, waiting for kernel-side
- * LTTng to implement mmap'd trace clock.
- */
+extern struct lttng_trace_clock *lttng_trace_clock;
+
+void lttng_ust_clock_init(void);
-/* Choosing correct trace clock */
+/* Use the kernel MONOTONIC clock. */
static __inline__
-uint64_t trace_clock_read64(void)
+uint64_t trace_clock_read64_monotonic(void)
{
struct timespec ts;
}
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;
if (!fp) {
return -ENOENT;
}
- len = fread(uuid, 1, CLOCK_UUID_LEN - 1, fp);
- if (len < CLOCK_UUID_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[CLOCK_UUID_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 */