473,573 Members | 3,119 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

multiprocessing : Queue.get_nowai t() never returns data

I stuck in new multiprocessing module (ex. processing). I dont'
understand why queue.get_nowai t() never returns data, but always
raises Empty, even if it is guaranteed that queue is not empty.

I've created small test case, here it is: http://pastebin.ca/1227666

Hope someone could explain why I'm wrong.It designed for 2.6 with
multiprocessing module,but it's trivial to convert it to processing
module for 2.5, just replace multiprocessing with "processing " and
"freeze_support " with "freezeSupp ort"
Oct 15 '08 #1
1 3754
my fault. changing "continue" to "break" solves the problem
Oct 15 '08 #2

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

4
4834
by: ~Gee | last post by:
Hi, When I try to compile the following program, I get the following error: $ g++ anotherTest.C anotherTest.C: In function `int main()': anotherTest.C:47: void value not ignored as it ought to be What I am trying to do is that I have a global queue. I create an object of class "testClass" and then add it to the queue. My question
4
1793
by: spinner | last post by:
--------------------------------------------- A two parter newbie question I am afraid. Am I right in thinking that using something like ... item = a_queue.get() print item will not print 'item' unless or until there is an item in the queue to
6
4972
by: James Radke | last post by:
Hello, I have a multithreaded windows NT service application (vb.net 2003) that I am working on (my first one), which reads a message queue and creates multiple threads to perform the processing for long running reports. When the processing is complete it uses crystal reports to load a template file, populate it, and then export it to a...
0
1435
by: Michael Bayer | last post by:
Hi - i was just going through this thread: http://mail.python.org/ pipermail/python-list/2006-April/336948.html , where it is suggested that the Lock instance used by Queue.Queue should be publically configurable. I have identified another situation where a Queue can be deadlocked, one which is also alleviated by configuring the type of...
6
11414
by: zxo102 | last post by:
Hi, I am using Queue from python2.4. Here is what happen to me: import Queue b = Queue.Queue(0) b.put(9999) b.get() # this is ok, it pops out 9999 b.get() # this one does not return anything and is hang on there Anybody knows what is going on with the second b.get()?
6
4645
by: Max Ivanov | last post by:
I'm playing with pyprocessing module and found that it eats lot's of memory. I've made small test case to show it. I pass ~45mb of data to worker processes and than get it back slightly modified. At any time in main process there are shouldn't be no more than two copies of data (one original data and one result). I run it on 8-core server and...
4
2068
by: nhwarriors | last post by:
I am attempting to use the (new in 2.6) multiprocessing package to process 2 items in a large queue of items simultaneously. I'd like to be able to print to the screen the results of each item before starting the next one. I'm having trouble with this so far. Here is some (useless) example code that shows how far I've gotten by reading the...
3
8438
by: redbaron | last post by:
I run into problem with queue from multiprocessing. Even if I queue.qsize() != 0 queue.get() still blocks and queue.get_nowait() raises Emtpy error. I'm unable to cut my big part to small test case, because smaller test case similair to my real app by design is works. In what conditions is it possible? while qresult.qsize(): result =...
1
3748
by: davy zhang | last post by:
I mean every process attach like thread in wingide like thread or tasklet in wingide :) maybe I asked toooo much:D
0
8017
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. ...
0
8201
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that...
1
7777
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For...
0
8063
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the...
0
6413
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then...
0
5290
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert...
0
3731
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in...
0
3731
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
0
1039
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.