Fix: consumer health state

[lttng-tools.git] / include / lttng / lttng.h

diff --git a/include/lttng/lttng.h b/include/lttng/lttng.h
index a9aee7233e7307735982c951b937ed5c2012d38e..0a12d9be75e4b97be6728bad11727105f4e68b8c 100644 (file)
--- a/include/lttng/lttng.h
+++ b/include/lttng/lttng.h
@@ -261,6 +261,7 @@ struct lttng_event_field {
        enum lttng_event_field_type type;
        char padding[LTTNG_EVENT_FIELD_PADDING];
        struct lttng_event event;
+       int nowrite;
 };
 
 /*
@@ -471,9 +472,20 @@ extern int lttng_start_tracing(const char *session_name);
 
 /*
  * Stop tracing for *all* registered traces (kernel and user-space).
+ *
+ * This call will wait for data availability for each domain of the session so
+ * this can take an abritrary amount of time. However, when returning you have
+ * the guarantee that the data is ready to be read and analyse. Use the
+ * _no_wait call below to avoid this behavior.
  */
 extern int lttng_stop_tracing(const char *session_name);
 
+/*
+ * Behave exactly like lttng_stop_tracing but does not wait for data
+ * availability.
+ */
+extern int lttng_stop_tracing_no_wait(const char *session_name);
+
 /*
  * Add context to event(s) for a specific channel (or for all).
  *
@@ -580,6 +592,16 @@ extern int lttng_disable_consumer(struct lttng_handle *handle);
  */
 extern int lttng_health_check(enum lttng_health_component c);
 
+/*
+ * For a given session name, this call checks if the data is ready to be read
+ * or is still being extracted by the consumer(s) hence not ready to be used by
+ * any readers.
+ *
+ * Return 0 if the data is _NOT_ available else 1 if the data is ready. On
+ * error, a negative value is returned and readable by lttng_strerror().
+ */
+extern int lttng_data_available(const char *session_name);
+
 #ifdef __cplusplus
 }
 #endif