+ current_log_critical_action = CMM_LOAD_SHARED(lttng_ust_log_critical_action);
+
+ /*
+ * Check early if we are initialized, this is unlikely as it's already tested
+ * in lttng_ust_logging_abort_on_critical_enabled before performing lazy initialization.
+ */
+ if (caa_unlikely(current_log_critical_action != LTTNG_UST_LOG_CRITICAL_ACTION_UNKNOWN))
+ return;
+
+ /*
+ * This getenv is not part of lttng_ust_getenv() because logging is
+ * used in the getenv initialization and thus logging must be
+ * initialized prior to getenv.
+ */
+ lttng_ust_abort_on_critical = getenv("LTTNG_UST_ABORT_ON_CRITICAL");
+
+ /*
+ * If the LTTNG_UST_ABORT_ON_CRITICAL environment variable is defined,
+ * call abort() on CRIT(), otherwise take no action.
+ */
+ if (lttng_ust_abort_on_critical)
+ current_log_critical_action = LTTNG_UST_LOG_CRITICAL_ACTION_ABORT;
+ else
+ current_log_critical_action = LTTNG_UST_LOG_CRITICAL_ACTION_NONE;
+
+ /* Initialize the log critical action */
+ CMM_STORE_SHARED(lttng_ust_log_critical_action, current_log_critical_action);
+}
+
+/*
+ * Initialize the global log level from the "LTTNG_UST_DEBUG" environment
+ * variable and the global log critical action from "LTTNG_UST_ABORT_ON_CRITICAL".
+ *
+ * This could end up being called concurrently by multiple threads but doesn't
+ * require a mutex since the input is invariant across threads and the result
+ * will be the same.
+ */
+void lttng_ust_logging_init(void)
+{
+ lttng_ust_logging_log_level_init();
+ lttng_ust_logging_log_critical_action_init();