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If you send a SIGUSR1 (10) to the daemon it will dump all the
threads current stacks to stdout. This will be useful when the
daemon is apparently hung and not processing requests.
eg.
$ sudo kill -10 <daemon pid>
Make sure that any and all code that executes in the main thread is
wrapped with a try/except block to ensure that at the very least
we log when things are going wrong.
When executing in the main thread, if we encounter an exception we
will bypass the notify_all call on the condition and the calling thread
never wakes up.
@staticmethod
def runner(obj):
# noinspection PyProtectedMember
Exception thrown here
----> obj._run()
So the following code doesn't run, which causes calling thread to hang
with obj.cond:
obj.function_complete = True
obj.cond.notify_all()
Additionally for some unknown reason the stderr is lost.
Best guess is it's something to do with scheduling a python function
into the GLib.idle_add. That made finding issue quite difficult.
If we always disable the sending of notify dbus events then in the case
where all the users are lvm dbus users we will be in udev handling mode
until at least 1 external lvm command occurs. Instead we will not disable
notify dbus until after we get at least 1 external event. This makes the
service get into the correct mode of operation faster.
Utilizing the --config option we will utilize global/notify_dbus=0 so
that the service itself doesn't generate change events which it then needs to
process.
Added a properties changed signal on the job dbus object so that client
can wait for a signal that the job is complete instead of polling or
blocking on the wait method.
Gris debugged that when we don't have a method the introspection
data is missing the interface itself eg.
<interface name="<your_obj_iface_name>" />
When adding the properties to the dbus object introspection we will
add the interface too if it's missing. This now allows us the
ability to have a dbus object with only properties.
The normal mode of operation will be to monitor for udev events until an
ExternalEvent occurs. In that case the service will disable monitoring
for udev events and use ExternalEvent exclusively.
Note: User specifies --udev the service will always monitor udev regardless
if ExternalEvent is being called too.
When we are running in a terminal it's useful to have a date & ts on log
output like you get when output goes to the journal. Check if we are
running on a tty and if we are, add it in.
