signals

这篇文章主要介绍了Python Web框架Flask信号机制(signals)介绍,本文介绍Flask的信号机制,讲述信号的用途,并给出创建信号.订阅信号.发送信号的方法,需要的朋友可以参考下 信号(signals) Flask信号(signals, or event hooking)允许特定的发送端通知订阅者发生了什么(既然知道发生了什么,那我们可以知道接下来该做什么了). Flask提供了一些信号(核心信号)且其它的扩展提供更多的信号.信号是用于通知订阅者,而不应该鼓励订阅者修改数据.相关信

python, signals, flask, Web, 框架, 信号机制February 24

最近在工作中无意才接触到了as3 signals这个玩意.AS3 Signals是个开源的轻量级框架,这个框架基本可以代替as3中内置的事件这套工作机制.好棒!因为在项目中,使用as3内置事件框架必须通过自定义事件才可以实现值的传递,大量自定义事件.定义常量和整个事件派发的管理.添加侦听器.移除侦听器,或多或少都会带来大量的代码,而signals这个框架思想原来在C#中原本就有,作者整合了C#中的signals思想,实现起来比as3内置的事件更快捷,可以很轻松的实现多个强类型值的传递,的在一定程

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Few people may realize, in a process calls exit after the process was not immediately disappear, but leave a zombie process called (Zombie) data structure. In Linux process five states, the zombie process is a very special one, it has given up almost

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Recently, human resource configurations open client download, but since the membership expired, download speed super slow. Think of the server in the school, and server bandwidth is very large, resources are very loose, it intends to use to download

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Assuming nginx installed in the / usr / local / nginx / . / Nginx-c conf / nginx.conf In any directory gdb-d / usr / local / nginx / objs / nginx 10776 Or gdb-d / usr / local / nginx / objs / nginx Enter and then attach 10777 (gdb) info program Using

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Detailed Linux shutdown command under linux some common shutdown / reboot commands shutdown, halt, reboot, and init, they are Reboot the system can achieve the purpose, but each command's internal work processes are different, through the introductio

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Some commonly used under linux shutdown / reboot commands shutdown, halt, reboot, and init, restart the system, they can achieve the purpose, but each command's internal work processes are different, through the introduction of this article, I hope y

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Start today with jrockit a large number of threads (2026 thread) error: Error starting thread: Resource temporarily unavailable After in-depth inquiry, ruled out the memory, handles and other issues. And switch to root user to open a large number of

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Yesterday, under Unix in the weblogic startup, exit the terminal that automatically shut down weblogic, read through the article, to solve the problem. So share it out for reference. Use the nohup make the program always running in the background Uni

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find /> results.txt: once find find /> results.txt &: in the background find (plus & meaning in the background) vi mode, enter ^ z, it will suspend the current process that vi and return to shell Then enter the fg, will return to vi If you d

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1.signal function #include <signal.h> void (*signal(int signo, void (*func)(int)))(int); Returns: previous disposition of signal (see following) if OK, SIG_ERR on error General prototype of the signal function can be written Sigfunc * signal (int, S

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Signal is the system script or command to send the message, inform them of the occurrence of an event. The following lists the most commonly used signals and their meanings: # Signal signal name The meaning 1 SIGHUP Parent process hangs or is killed

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Reproduced: http://baike.baidu.com/view/1839401.htm nohup Uses: LINUX command usage, do not hang up the run command. Syntax: nohup Command [Arg ...] [&] Description: nohup command to run the Command parameter and any related Arg parameters specified

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Process management and job control ps, top, htop command to use Transmitted signal Use the kill command to send signals to manage the process. Management process, the underlying principle is 1 before resorting to force. The first to send signals to p

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Signal processing and network-related procedures, often during debugging to receive SIGPIPE, cause gdb to stop. Looked at the gdb info, solution is simple. With the handle command to set the default signal handling behavior of what can be: handle SIG

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About ZOMBIE process: The process has died, but did not release system resources, including memory and some some system tables, etc., if such a process a lot, will lead to system problems. Use ps-el to see the process state if Z, is a zombie process.

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linux signal related to a structure struct sigaction sigaction signal mainly in the installation and sigqueue signaling in this structure will be used when the / usr / include / bits / sigaction.h Which can be found in the description of the structur

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Some commonly used under linux shutdown / reboot commands shutdown, halt, reboot, and init, restart the system, they can achieve the purpose, but each command's internal work processes are different, through the introduction of this article, I hope y

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1.Server Option and Variable Reference 1). SHOW [GLOBAL | SESSION] STATUS 2). Show collation; 3). Show variables like'%...%' 2.Server Response to Signals a). SIGTERM causes the server to shut down. b). SIGHUP causes the server to reload the grant tab

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I used Linux command of killall - kill the process name specified This link: http://codingstandards.iteye.com/blog/986313 (reproduced please indicate the source) Use Description killall command specifies the name used to kill the process (kill proces

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vi /etc/security/limits.conf * soft nproc 65536 * hard nproc 65536 * soft nofile 65536 * hard nofile 65536 View Connections [[email protected] logs]# ulimit -an core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 fi

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Turn off a process there are many ways in ZeroMQ is respected through the use of signals in the notice, controllable unloading, close the process. Here, prior to invoking the "divide and rule" case (concrete can see here). Example diagram: Clear

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push / pull mode: Model Description: 1 upstream (task release) 2 workers (middle, specific work) 3 downstream (signal acquisition or to collect the results) Upstream code: import zmq import random import time context = zmq.Context() # Socket to send

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Use the nohup command: do not hang up the run command. Syntax: nohup Command [Arg ...] [&] Description: nohup command to run the Command parameter and any related Arg parameters specified by the command, ignoring all hang (SIGHUP) signals. After the

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java doc for a description of this anomaly / ** * Signals that an error occurred while attempting to connect a * Socket to a remote address and port. Typically, the remote * Host cannot be reached because of an intervening firewall, or * If an interm

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Unix / Linux under the general wanted a program such as running in the background, many of which are used & in the end of the program to let the program run automatically. For example, we want to run mysql in the background: / Usr / local / mysql / b

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Related reference: http://library.gnome.org/devel/gobject/2.14/signal.html And nautilus-2.30.0/src/file-manager/fm-directory-view.c In GObject (usually in GTK) we need to define some of their signals, to achieve control between the callback (callback

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linux 2009-02-20 16:47:00 read 460 comments 0 Font Size: medium and small transfer http://hi.baidu.com/phenix_yw/blog/item/6eb4ca391d1479f23a87ce19.html Subscribe Signal install function sigaction (int signum, const struct sigaction * act, struct sig

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Original Address: http://hi.baidu.com/whyang2006/blog/item/98807e8258bcf899f703a604.html This document describes the Unix systems in the class how to stop and restart Apache. Windows NT/2000/XP/2003 users see running Apache as a service , Windows 9x/

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1, I downloaded the iso file oracle10g, and then I extract the iso file to generate database folder in / home below. 2, then into the database folder, change all the file execute permissions: groupadd oracle useradd-g oracle oracler chown-R oracler. (to m

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Original Address: http://hi.baidu.com/whyang2006/blog/item/98807e8258bcf899f703a604.html This document describes how the Unix-like system to stop and restart Apache. Windows NT/2000/XP/2003 users see running Apache as a service , Windows 9x/ME users

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1, I downloaded the oracle10g the iso file, and then, I extract the iso file to generate database folder on the / home below. 2, and then into the database folder, and execute permissions for all files modified: groupadd oracle useradd-g oracle oracler ch

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And similar to mobile phone base station location, wifi access point needs to collect the location information. The earliest development of this technology is the Skyhook company. The principle of this technique is the use of the following three fact

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POSIX threads - pthread_sigmask Collection POSIX threads - pthread_sigmask In multi-threaded program, we hope only to process signals in the main thread, you can use Function: int pthread_sigmask (int how, const sigset_t * set, sigset_t * oset) Used

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Summary: Linux system there are many states in the process, before we say R, S, D three states, as well as other three states, where we talk about together, complement the previous article. Tags: Linux process status The above article, we introduced

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According to Nginx (0.7.67 version) of the code, the basic process of Nginx to create, process, and the main event handling of a brief analysis. Basically, the parent process (that is the main process) will be initialized and started to read the conf

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According to Nginx (0.7.67 version) of the code, the basic process of Nginx to create, process, and the main event handling of a brief analysis. Basically, the parent process (that is the main process) will be initialized and started to read the conf

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A few days ago, when encountered in the management of a strange question, and today have the chance to install MySQL environment to reproduce this problem, because the environment is not the most original, it may not be able to reproduce, I can only

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1. Tee command Detailed Function: Read data from standard input and output its contents into a file. Syntax: tee [-ai] [- help] [- version] [file ...] Supplement: tee command to read data from standard input, output its contents to standard output de

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Yesterday, a friend in the group presents a problem that requires a pushButton click PyQt in response to it when you pass in a groove and transmitting signals parameters related object properties, such as in order to create the N-pushButton, the numb

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AutoResetEvent allows threads to signal each other through communication. Typically, this communication involves threads need exclusive access to resources. Thread by calling AutoResetEvent WaitOne to wait on the signal. If AutoResetEvent terminated

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Event processing is the occurrence of an event triggered a series of related activities, which can dynamically add and remove. For instance, we point a button, can trigger a lot of action, some of the activities that we can register to this event, yo

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. Net built-in ThreadPool class greatly facilitate the development of multi-threaded programs,. Net programmers do not like the way Java programmers to write their own thread pool or thread pool to find someone else had written. ThreadPool is also us

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shutdown [-cfFhknr (parameter name)] [-t seconds] time [warning] The specific function of each parameter: -C to cancel the previous shutdown command. It is noteworthy that, when performing a like "shutdown-h 11:10" the command, just press "

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I used the Linux command nohup - run other commands, and ignore the SIGHUP signal This link: http://codingstandards.iteye.com/blog/835536 (reproduced please indicate the source) Use Description nohup command can be used to execute other commands, and

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Gray Code (Gray code) is a collection of series, each number used to represent binary, assuming the number of n bits to represent each well, either between two numbers is only one bit value is different, such as the following 3 bit Gray Code: 000 001

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We often encounter this problem, use telnet / ssh login the remote Linux server, run a number of time consuming tasks, the result is due to network instability result in the task fail in the middle. How to order submitted by local close the terminal

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The first line in Linux system using ulimit-a confirmation, have set max open files to 65535, merit, an application should not open so many number of files. I first suspected that the cause of the problem short connection, and later through monitorin

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1, due to orcale10 does not support redhat as5 need to modify / etc / redhat-realease the Red Hat Enterprise Linux Server release 5 (Tikanga) to Red Hat Enterprise Linux Server release 4 (Tikanga), after installation change it back 2, modify / etc /

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A simple example of an activity diagram A subsidiary activity diagram Invoke the subsidiary activity If you want to show who does what, you can divide an activity diagram into partitions, which show which actions one class or organization unit carrie

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