New in version 3.27.
TIMEOUT_SIGNAL_NAME test property is set, this property
specifies the number of seconds to wait for a test process to terminate after
sending the custom signal. Otherwise, this property has no meaning.
The grace period may be any real value greater than
0.0, but not greater
60.0. If this property is not set, the default is
This is available only on platforms supporting POSIX signals. It is not available on Windows.