-`LTTNG_UST_BLOCKING_RETRY_TIMEOUT`::
- Maximum duration (milliseconds) to retry event tracing when
- there's no space left for the event record in the sub-buffer.
-+
---
-`0`::
- Never block the application.
-
-Positive value::
- Block the application for the specified number of milliseconds. If
- there's no space left after this duration, discard the event
- record.
-
-Negative value::
- Block the application until there's space left for the event record.
---
-+
-Default: {lttng_ust_blocking_retry_timeout}.
+`LTTNG_UST_ALLOW_BLOCKING`::
+ If set, allow application to retry event tracing when there's
+ no space left for the event record in the sub-buffer, therefore
+ effectively blocking the application until space is made available
+ or timeout is reached. This only has effect on channels with
+ `blocking-timeout` set.