After some trial and error I found out how to interprete the results of scipy.signal.deconvolve() and I post my findings as an answer. Let’s start with a working example code import numpy as np import scipy.signal import matplotlib.pyplot as plt # let the signal be box-like signal = np.repeat([0., 1., 0.], 100) # and use … Read more
As said by others, only one signal handler can be set, which is the last one. You would then have to manage calling two functions yourself. The sigaction function can return the previously installed signal handler which you can call yourself. Something like this (untested code): /* other signal handlers */ static void (*lib1_sighandler)(int) = … Read more
No. From the man pages: execve() does not return on success, and the text, data, bss, and stack of the calling process are overwritten by that of the program loaded. The program invoked inherits the calling process’s PID, and any open file descriptors that are not set to close on exec. Signals pending on the … Read more
[Q-3] Does the terminate variable in my example have to be volatile? I’ve seen many examples where this variable is volatile, and others where it is not. The flag terminate should be volatile sig_atomic_t: Because handler functions can be called asynchronously. That is, a handler might be called at any point in the program, unpredictably. … Read more
You can define additional arguments in custom save method of model like this: class MyModel(models.Model): …. def save(self, *args, **kwargs): super(MyModel, self).save(*args, **kwargs) self.my_extra_param = ‘hello world’ And access this additional argument through instance in post_save signal receiver: @receiver(post_save, sender=MyModel) def process_my_param(sender, instance, *args, **kwargs): my_extra_param = instance.my_extra_param
The idea is that you provide a mask in set, effectively a list of signals. The how argument says what you should do with the mask in set. You can either use SIG_BLOCK to block the signals in the set list, or SIG_UNBLOCK to unblock them. Neither of these changes the signals that aren’t set … Read more
Syntax for python >=3.5 loop = asyncio.get_event_loop() for signame in (‘SIGINT’, ‘SIGTERM’): loop.add_signal_handler(getattr(signal, signame), lambda: asyncio.ensure_future(ask_exit(signame)))
SIGHUP as a notification about terminal closing event doesn’t make sense for a daemon, because deamons are detached from their terminal. So the system will never send this signal to them. Then it is common practice for daemons to use it for another meaning, typically reloading the daemon’s configuration. This is not a rule, just … Read more
First of all, note that Ben’s answer is correct. As far as I can tell, the whole purpose of realtime signals in POSIX is as a realtime delivery mechanism for AIO, message queue notifications, timer expirations, and application-defined signals (both internal and inter-process). With that said, signals in general are a really bad way to … Read more
SIGTERM is the default signal sent to containers to stop them: https://docs.docker.com/engine/reference/commandline/stop/ STOPSIGNAL does allow you to override the default signal sent to the container. Leaving it out of the Dockerfile causes no harm – it will remain the default of SIGTERM. This being said, it is unclear why the author has explicitly defined the … Read more