signal

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: In short, I get following error: QObject :: connect : Cannot queue arguments of type 'cv::Mat' ( Make sure 'cv::Mat' is registered using qRegisterMetaType ().) What I'm trying to do is send a signal containing two cv::Mat images from a QThread to the main thread, so that I can display the output. There's no compile time error, but when I run the program, it gets stuck at a breakpoint in qglobal.h ( inline void qt_noop() {} ). I've tried to add Q_DECLARE_METATYPE(cv::Mat) to the code, to no avail. I'm quite suck with what to do now.

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: This is a follow up to my other post Installing signal handler with Python . In short, Linux blocks all signals to PID 1 (including SIGKILL) unless Init has installed a signal handler for a particular signal; as to prevent kernel panic if someone were to send a termination signal to PID1. The issue I've been having, is it would seem that the signal module in Python doesn't install signal handlers in a way the system recognises. My Python Init script was seemingly, completely ignoring all signals as I think they were being blocked. I seem to

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I can't seem to see an obvious answer in the documentation. When I update a file on S3 and I have CloudFront enabled, does S3 send an invalidation signal to CloudFront? Or do I need to send it myself after updating the file? 回答1: S3 doesn't send any invalidation information to CloudFront. By default CloudFront will hold information up to the maximum time specified by the Cache Control headers that were set when it retrieved the data from the origin (it may remove items from its cache earlier if it feels like it). You can invalidate cache

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm just trying to debug code with gdb on Mac OSX Version 10.12 but always getting this unknown error when launching my program in gdb. I codesigned the gdb after installation and compiled my code with the -g flag. This is what is happening: computer:hello user$ gdb a.out GNU gdb (GDB) 7.12 Copyright (C) 2016 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm debugging a piece of (embedded) software. I've set a breakpoint on a function, and for some reason, once I've reached that breakpoint and continue I always come back to the function (which is an initialisation function which should only be called once). When I remove the breakpoint, and continue , GDB tells me: Program received signal SIGTRAP, Trace/breakpoint trap. Since I was working with breakpoints, I'm assuming I fell in a "breakpoint trap". What is a breakpoint trap? 回答1: Breakpoint trap just means the processor has hit a

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Is there any way to run one last command before a running Python script is stopped by being killed by some other script, keyboard interrupt etc. 回答1: import time try: time.sleep(10) finally: print "clean up" clean up Traceback (most recent call last): File "<stdin>", line 2, in <module> KeyboardInterrupt If you need to catch other OS level interrupts, look at the signal module: http://docs.python.org/library/signal.html Signal Example from signal import * import sys, time def clean(*args): print "clean me" sys.exit(0) for sig in (SIGABRT,

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Is it possible to trap Linux signals (e.g. SIGUSR1) through an handler in Erlang? (without having to resort to a driver crafted in C) 回答1: (NOT A REAL ANSWER) In 2001 someone asked: Does anyone have any examples of unix signal handling in erlang. I would like to make a loadbalancer that I have written respond to sighup. At that time the answer was: There is no provision for handling signals in Erlang "itself", i.e. you will need to use a driver - or a port program of course, might actually be a better idea. Also for the driver case, the

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I think it's unreasonable for a library to require preprocessing of my source code with a special tool. That said, several people have recommended the Qt library to me for cross platform GUI development. How usable is Qt without the preprocessing step? EDIT: Okay people, I'm not meaning this question as a rip on Qt -- too many Qt fanboys are treating it as if it is. I don't want to discuss the merits of the fact that Qt came up with this preprocessing tool. I understand why the tool is there, and I understand why there are large parts of Qt

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: In python 2.6 under Linux, I can use the following to handle a TERM signal: import signal def handleSigTERM(): shutdown() signal.signal(signal.SIGTERM, handleSigTERM) Is there any way to setup a handler for all signals received by the process, other than just setting them up one-at-a-time? 回答1: You could just loop through the signals in the signal module and set them up. for i in [x for x in dir(signal) if x.startswith("SIG")]: try: signum = getattr(signal,i) signal.signal(signum,sighandler) except (OSError, RuntimeError) as m: #OSError for

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a test harness (written in Python) that needs to shut down the program under test (written in C) by sending it ^C . On Unix, proc.send_signal(signal.SIGINT) works perfectly. On Windows, that throws an error ("signal 2 is not supported" or something like that). I am using Python 2.7 for Windows, so I have the impression that I should be able to do instead proc.send_signal(signal.CTRL_C_EVENT) but this doesn't do anything at all. What do I have to do? This is the code that creates the subprocess: # Windows needs an extra argument passed