tree 78f0751f881ef74e6211cd1541ce965c307c4763
parent 4460f26c1182f412b5ab07f093a0f078191995ef
author William A. Kennington III <wak@google.com> 1541204736 -0700
committer William A. Kennington III <wak@google.com> 1541206627 -0700

signal: Add idempotent block function

This makes it trivial to block individual signals from being handled by
a thread. Useful when tryng to set up signal handling in event loops.

Tested:
    Builds and passes unit tests.

Change-Id: I61739debe2a47ec0ec3e767cf138125c6f59165f
Signed-off-by: William A. Kennington III <wak@google.com>