multithreading

问题 I imagine that this is a common problem, but after some searching I wasn't able to find anything relevant. The problem I'm having is that I'm getting a No Hibernate Session bound to thread exception when annotating my resource method with @UnitOfWork and inside my resource method, making an asynchronous DAO call. The idea behind this design is to make the database call on a separate I/O thread so that it frees up the Jersey resource thread. Unfortunately, as the exception says, this

问题 I have a function that crawls the web for data and computes a score for the search. However, this can take a while and sometimes the webpage times out before finishing execution. So I created a separate thread that executes the function and loading.html that tells the client that data is still being collected. Once the function ends in the thread, how do I reload the webpage to display output.html that displays the score. This is a simpler version of what I have so far: from flask import

问题 I have a function that crawls the web for data and computes a score for the search. However, this can take a while and sometimes the webpage times out before finishing execution. So I created a separate thread that executes the function and loading.html that tells the client that data is still being collected. Once the function ends in the thread, how do I reload the webpage to display output.html that displays the score. This is a simpler version of what I have so far: from flask import

问题 The code posted below initiates a single Thread that fires up 4 cores on my macbookpro. Is there a way to limit to how many cores the thread should be using? import threading import logging logging.basicConfig(level=logging.DEBUG, format='(%(threadName)s) %(message)s',) def func(): logging.debug('starting') m=0 for i in range(500000000): m+=i logging.debug('exiting') thread = threading.Thread(target=func) thread.start() logging.debug('completed') Here is the log: Loaded sitecustomize.py

问题 The code posted below initiates a single Thread that fires up 4 cores on my macbookpro. Is there a way to limit to how many cores the thread should be using? import threading import logging logging.basicConfig(level=logging.DEBUG, format='(%(threadName)s) %(message)s',) def func(): logging.debug('starting') m=0 for i in range(500000000): m+=i logging.debug('exiting') thread = threading.Thread(target=func) thread.start() logging.debug('completed') Here is the log: Loaded sitecustomize.py

问题 I generally don't need to explicitly use threads in my Django application level programming (i.e. views). But I've noticed a library that looks interesting which handles server side analytics by via threading. During a Django view, you would use their Python client to batch HTTP POSTs to their web service in a separate (non-daemon) thread. Normally, I would go with RabbitMQ for something like this, instead of threads but they wanted to lower the startup costs for the library. My question is,

问题 I generally don't need to explicitly use threads in my Django application level programming (i.e. views). But I've noticed a library that looks interesting which handles server side analytics by via threading. During a Django view, you would use their Python client to batch HTTP POSTs to their web service in a separate (non-daemon) thread. Normally, I would go with RabbitMQ for something like this, instead of threads but they wanted to lower the startup costs for the library. My question is,

问题 How can I access a control from a thread other than the thread it was created on, avoiding the cross-thread error? Here is my sample code for this: private void Form1_Load(object sender, EventArgs e) { Thread t = new Thread(foo); t.Start(); } private void foo() { this.Text = "Test"; } 回答1: There's a well known little pattern for this and it looks like this: public void SetText(string text) { if (this.InvokeRequired) { this.Invoke(new Action<string>(SetText), text); } else { this.Text = text;

问题 Python guru I need your help. I faced quite strange behavior: empty python Process hangs on joining . Looks like it forks some locked resource. Env: Python version: 3.5.3 OS: Ubuntu 16.04.2 LTS Kernel: 4.4.0-75-generic Problem description: 1) I have a logger with thread to handle messages in background and queue for this thread. Logger source code (a little bit simplified). 2) And I have a simple script which uses my logger (just code to display my problem): import os from multiprocessing

问题 I have just started with Python, although I have been programming in other languages over the past 30 years. I wanted to keep my first application simple, so I started out with a little home automation project hosted on a Raspberry Pi. I got my code to work fine (controlling a valve, reading a flow sensor and showing some data on a display), but when I wanted to add some web interactivity it came to a sudden halt. Most articles I have found on the subject suggest to use the Flask framework to