t signals (user9)
* :r - block interrupt signals (user8)
* :0-9 - block a specific user signal

The sigmask argument also can take environment flags. If any mutually exclusive flags are present, the last flag takes precedence.

* :i - inherit the environment from the current fiber
* :p - the environment table's prototype is the current environment table</pre><a href="https://janetdocs.org/fiber/new">Community Examples</a></div><hr><div class="binding"><span id="fiber/root" class="binding-sym">fiber/root</sp