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-rw-r--r--Doc/library/signal.rst7
1 files changed, 4 insertions, 3 deletions
diff --git a/Doc/library/signal.rst b/Doc/library/signal.rst
index ffe7f09d48..f318cfa227 100644
--- a/Doc/library/signal.rst
+++ b/Doc/library/signal.rst
@@ -184,7 +184,7 @@ The :mod:`signal` module defines the following functions:
Fetch and/or change the signal mask of the calling thread. The signal mask
is the set of signals whose delivery is currently blocked for the caller.
- The old signal mask is returned.
+ Return the old signal mask as a set of signals.
The behavior of the call is dependent on the value of *how*, as follows.
@@ -196,8 +196,9 @@ The :mod:`signal` module defines the following functions:
* :data:`SIG_SETMASK`: The set of blocked signals is set to the *mask*
argument.
- *mask* is a list of signal numbers (e.g. [:const:`signal.SIGINT`,
- :const:`signal.SIGTERM`]).
+ *mask* is a set of signal numbers (e.g. {:const:`signal.SIGINT`,
+ :const:`signal.SIGTERM`}). Use ``range(1, signal.NSIG)`` for a full mask
+ including all signals.
For example, ``signal.pthread_sigmask(signal.SIG_BLOCK, [])`` reads the
signal mask of the calling thread.