signals

django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet. Exception appeared when I added: import signals in init .py file (apps/application/init.py) from models import Review in signals.py file (apps/application/signals.py) I want to send an http request when there is an insert in the model Review. So I need to import Review model (in the __init.py__ file) to execute the following code: @receiver (pre_save, sender = Review) def my_handler (sender, ** kwargs): .... In the Django's source , this is where the exception is comming from: def check_apps_ready(self): """Raise an exception

I'm trying to setup a signal so that when a valid form is saved, a function is ran to carry out a related task. My app structure is as follows; - events - helpers - __init__.py - status.py - models - signals - __init__.py - event.py - __init__.py - event.py - status.py - views - __init__.py - event.py I believe signals need to be imported as early as possible, before models, so at the top of models/__init__.py I've got from .signals import * . # views/event.py class AddEventView(CreateView): """ View for adding an Event. """ model = Event form_class = EventForm success_url = reverse_lazy(

I am writing a program that reads the name of the signal (e.g. SIGSTOP, SIGKILL etc) as a string from the command line and calls the kill() system call to send the signal. I was wondering if there is a simple way to convert the string to signal codes (in signal.h). Currently, I'm doing this by writing my own map that looks like this: signal_map["SIGSTOP"] = SIGSTOP; signal_map["SIGKILL"] = SIGKILL; .... But its tedious to write this for all signals. So, I was looking for a more elegant way, if it exists. Not sure if that is what you are loking for, but: strerror() converts a error code to the

The C and C++ standards support the concept of signal. However, the C11 standard says that the function signal() cannot be called in multi-threaded environments, or the behavior is undefined. But I think the signal mechanism is by nature for multi-threaded environments. A quote from the C11 standard 7.14.1.1.7 "Use of this function in a multi-threaded program results in undefined behavior. The implementation shall behave as if no library function calls the signal function." Any explanations about this? The following code is self-evident. #include <thread> #include <csignal> using namespace std

According to GObject reference g_signal_connect_swapped(instance, detailed_signal, c_handler, data); connects a GCallback function to a signal for a particular object. The instance on which the signal is emitted and data will be swapped when calling the handler. I don't quite get what this means. Does this mean that the data will point to the object pointed to by instance and instance will point to the object that was pointed to by data or am I making a mistake here? If former is the case then what is the logic behind this? You understand correctly. This allows you to do tricks like the

I've this problem with my server/client on C. If I close the server socket after a SIGINT, and then I try to write on this closed connection from the client, I've to do write two times before than client generates SIGPIPE. Shouldn't it generate it immediately? Is this a normal behaviour or something I need to fix? This is my code. I'm testing things on ubuntu, same PC, connecting via 127.0.0.1. server.c sigset_t set; struct sigaction sign; int sock_acc; int sock; void closeSig(){ close(sock_acc); close(sock); exit(1); } int main(){ sigemptyset(&set); sigaddset(&set, SIGINT); sig.sa_sigaction =