Hi all,
In Python, Threads cannot be paused, i remember reading this somewhere,
so is there a way around this ?
TIA 15 1140
placid wrote: Hi all,
In Python, Threads cannot be paused, i remember reading this somewhere, so is there a way around this ?
When you say paused do you mean paused by an external source or paused
by a call internal to the thread? There are plenty of synchronization
constructs for making threads wait: Check out Events and Conditions
-carl
--
Carl J. Van Arsdall cv*********@mvista.com
Build and Release
MontaVista Software
Carl J. Van Arsdall wrote: placid wrote: Hi all,
In Python, Threads cannot be paused, i remember reading this somewhere, so is there a way around this ?
When you say paused do you mean paused by an external source or paused by a call internal to the thread? There are plenty of synchronization constructs for making threads wait: Check out Events and Conditions
I have a thread that has a job Queue, it continuosly polls this queue
to see if there are any jobs for it, what i really wont to be able to
do is, when the queue is empty, i want the thread to pause (or more
technical, i want the thread to block) until the queue gets populated
again. Is this possible ? -carl --
Carl J. Van Arsdall cv*********@mvista.com Build and Release MontaVista Software
On May 11, 2006, at 8:02 PM, placid wrote: Carl J. Van Arsdall wrote: placid wrote: Hi all,
In Python, Threads cannot be paused, i remember reading this somewhere, so is there a way around this ?
When you say paused do you mean paused by an external source or paused by a call internal to the thread? There are plenty of synchronization constructs for making threads wait: Check out Events and Conditions
I have a thread that has a job Queue, it continuosly polls this queue to see if there are any jobs for it, what i really wont to be able to do is, when the queue is empty, i want the thread to pause (or more technical, i want the thread to block) until the queue gets populated again. Is this possible ?
The previous poster answered your question - you want to use a
condition variable. http://docs.python.org/lib/condition-objects.html
Dave
David Reed wrote: On May 11, 2006, at 8:02 PM, placid wrote:
Carl J. Van Arsdall wrote: placid wrote: Hi all,
In Python, Threads cannot be paused, i remember reading this somewhere, so is there a way around this ?
When you say paused do you mean paused by an external source or paused by a call internal to the thread? There are plenty of synchronization constructs for making threads wait: Check out Events and Conditions I have a thread that has a job Queue, it continuosly polls this queue to see if there are any jobs for it, what i really wont to be able to do is, when the queue is empty, i want the thread to pause (or more technical, i want the thread to block) until the queue gets populated again. Is this possible ?
The previous poster answered your question - you want to use a condition variable.
http://docs.python.org/lib/condition-objects.html
thanks, this is what i was after Dave
placid wrote: I have a thread that has a job Queue, it continuosly polls this queue to see if there are any jobs for it, what i really wont to be able to do is, when the queue is empty, i want the thread to pause (or more technical, i want the thread to block) until the queue gets populated again. Is this possible ?
Isn't that the default behaviour of Queue.get()?
Peter
Peter Otten <__*******@web.de> wrote: placid wrote:
I have a thread that has a job Queue, it continuosly polls this queue to see if there are any jobs for it, what i really wont to be able to do is, when the queue is empty, i want the thread to pause (or more technical, i want the thread to block) until the queue gets populated again. Is this possible ?
Isn't that the default behaviour of Queue.get()?
Absolutely! placid, just call the get method of that Queue instance: if
the queue is empty your thread DOES pause, or block, until there's some
item put on the queue by another thread.
Alex
Dennis Lee Bieber wrote: On 11 May 2006 17:02:51 -0700, "placid" <Bu****@gmail.com> declaimed the following in comp.lang.python: do is, when the queue is empty, i want the thread to pause (or more technical, i want the thread to block) until the queue gets populated again. Is this possible ? Did you read the documentation for Queue methods?
x = q.get(true) #blocks until data is available
Like a good lawyer, Dennis knows the answer before he asks the question.
--
Edward Elliott
UC Berkeley School of Law (Boalt Hall)
complangpython at eddeye dot net
Dennis Lee Bieber wrote: On 11 May 2006 17:02:51 -0700, "placid" <Bu****@gmail.com> declaimed the following in comp.lang.python:
I have a thread that has a job Queue, it continuosly polls this queue to see if there are any jobs for it, what i really wont to be able to do is, when the queue is empty, i want the thread to pause (or more technical, i want the thread to block) until the queue gets populated again. Is this possible ? Did you read the documentation for Queue methods?
there is no need to be patronizing about this dude, im just learning
Python in my spare time, as im a Intern Software Engineer x = q.get(true) #blocks until data is available
this is even better, thanks dude
-- Wulfraed Dennis Lee Bieber KD6MOG wl*****@ix.netcom.com wu******@bestiaria.com HTTP://wlfraed.home.netcom.com/ (Bestiaria Support Staff: we******@bestiaria.com) HTTP://www.bestiaria.com/
placid enlightened us with: Did you read the documentation for Queue methods?
there is no need to be patronizing about this dude, im just learning Python in my spare time, as im a Intern Software Engineer
There is nothing patronizing about the question, it's merely an
enquiry to a possible fact. If you're going to be a techie, you should
learn stuff like that.
Sybren
--
The problem with the world is stupidity. Not saying there should be a
capital punishment for stupidity, but why don't we just take the
safety labels off of everything and let the problem solve itself?
Frank Zappa
Sybren Stuvel wrote: placid enlightened us with: Did you read the documentation for Queue methods? there is no need to be patronizing about this dude, im just learning Python in my spare time, as im a Intern Software Engineer
There is nothing patronizing about the question, it's merely an enquiry to a possible fact. If you're going to be a techie, you should
true enough
learn stuff like that.
its always said that (in programming) that the easiest solution to a
problem is hard to find, well for me posting my question here was the
hardest, when the easier solution was for me to go look at the Python
documentation! Sybren -- The problem with the world is stupidity. Not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself? Frank Zappa
placid enlightened us with: its always said that (in programming) that the easiest solution to a problem is hard to find
Yeah, that's true allright!
Sybren
--
The problem with the world is stupidity. Not saying there should be a
capital punishment for stupidity, but why don't we just take the
safety labels off of everything and let the problem solve itself?
Frank Zappa
Aww shoot, I never knew that!! LOL, I implemented my own worker thread
class using a mutex protected job list and a pair of connected sockets
for interprocess communication when I could just have used the darn
Queue module instead. Grrrrr .... hehe.
On 2006-05-12, antred <Nu****@gmx.net> wrote:
Nerver knew what? Please quote for context. Aww shoot, I never knew that!! http://docs.python.org/lib/QueueObjects.html
get([block[, timeout]])
Remove and return an item from the queue. If optional args
block is true and timeout is None (the default), block if
necessary until an item is available. [...]
--
Grant Edwards grante Yow! VICARIOUSLY
at experience some reason
visi.com to LIVE!!
On 2006-05-12, Sybren Stuvel <sy*******@YOURthirdtower.com.imagination> wrote: placid enlightened us with: Did you read the documentation for Queue methods?
there is no need to be patronizing about this dude, im just learning Python in my spare time, as im a Intern Software Engineer
There is nothing patronizing about the question, it's merely an enquiry to a possible fact. If you're going to be a techie, you should learn stuff like that.
It's also valuable information to the maintainers of the
documentation. If he _did_ read the documentation and still
didn't know that Queue.get() could block, then one might ask
how the documentation could be improved.
--
Grant Edwards grante Yow! Is this ANYWHERE,
at USA?
visi.com
Dennis Lee Bieber wrote: On Fri, 12 May 2006 14:30:12 -0000, Grant Edwards <gr****@visi.com> declaimed the following in comp.lang.python:
On 2006-05-12, Sybren Stuvel <sy*******@YOURthirdtower.com.imagination> wrote: placid enlightened us with: >> Did you read the documentation for Queue methods? > > there is no need to be patronizing about this dude, im just learning > Python in my spare time, as im a Intern Software Engineer
There is nothing patronizing about the question, it's merely an enquiry to a possible fact. If you're going to be a techie, you should learn stuff like that. It's also valuable information to the maintainers of the documentation. If he _did_ read the documentation and still didn't know that Queue.get() could block, then one might ask how the documentation could be improved.
If it means anything -- I typically do bring up the help files and cut&paste the relevant paragraph. But I had a 24-hour backlog and it was late at night so a straight off-the-cuff entry was made. Though I suppose one could go back to the "smart questions" FAQ, and have suggested the original poster tell us what documentation was read in search of a solution prior to their post (in which case my short response could be interpreted as a less than subtle hint to read the references first).
telling me to read the documentation would have been a good reminder
dude!
-- Wulfraed Dennis Lee Bieber KD6MOG wl*****@ix.netcom.com wu******@bestiaria.com HTTP://wlfraed.home.netcom.com/ (Bestiaria Support Staff: we******@bestiaria.com) HTTP://www.bestiaria.com/
thanks again for all of you who replied with great answers. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
by: Ronan Viernes |
last post by:
Hi,
I have created a python script (see below) to count the maximum number
of threads per process (by starting new threads continuously until it
breaks).
######
#testThread.py
import...
|
by: Al Tobey |
last post by:
I was building perl 5.8.2 on RedHat Enterprise Linux 3.0 (AS) today and
noticed that it included in it's ccflags "-DTHREADS_HAVE_PIDS." I am
building with -Dusethreads. With newer Linux...
|
by: m |
last post by:
Hello,
I have an application that processes thousands of files each day. The
filenames and various related file information is retrieved, related
filenames are associate and placed in a linked...
|
by: Kovan Akrei |
last post by:
Hi,
I would like to know how to reuse an object of a thread (if it is possible)
in Csharp? I have the following program:
using System;
using System.Threading;
using System.Collections;
...
|
by: bygandhi |
last post by:
Hi -
I am writing a service which will check a process and its threads for
their state ( alive or dead ).
The process has 5 .net managed threads created using thread.start and
each have been...
|
by: [Yosi] |
last post by:
I would like to know how threads behavior in .NET .
When an application create 4 threads for example start all of them, the OS
task manager will execute all 4 thread in deterministic order manes,...
|
by: RahimAsif |
last post by:
Hi guys,
I would like some advice on thread programming using C#.
I am writing an application that communicates with a panel over
ethernet, collects data and writes it to a file. The way the...
|
by: mjheitland |
last post by:
Hi,
I like to know how many threads are used by a Threading.Timer object.
When I create a Threading.Timer object calling a short running method
every 5 seconds I expected to have one additional...
|
by: Darian |
last post by:
Is there a way to find all the thread names that are running in a
project?
For example, if I have 5 threads T1, T2, T3, T4, T5...and T2, T4, and
T5 are running...I want to be able to know that...
|
by: tdahsu |
last post by:
All,
I'd appreciate any help. I've got a list of files in a directory, and
I'd like to iterate through that list and process each one. Rather
than do that serially, I was thinking I should...
|
by: DolphinDB |
last post by:
Tired of spending countless mintues downsampling your data? Look no further!
In this article, you’ll learn how to efficiently downsample 6.48 billion high-frequency records to 61 million...
|
by: ryjfgjl |
last post by:
ExcelToDatabase: batch import excel into database automatically...
|
by: isladogs |
last post by:
The next Access Europe meeting will be on Wednesday 6 Mar 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM).
In this month's session, we are pleased to welcome back...
|
by: Vimpel783 |
last post by:
Hello!
Guys, I found this code on the Internet, but I need to modify it a little. It works well, the problem is this: Data is sent from only one cell, in this case B5, but it is necessary that data...
|
by: ArrayDB |
last post by:
The error message I've encountered is; ERROR:root:Error generating model response: exception: access violation writing 0x0000000000005140, which seems to be indicative of an access violation...
|
by: PapaRatzi |
last post by:
Hello,
I am teaching myself MS Access forms design and Visual Basic. I've created a table to capture a list of Top 30 singles and forms to capture new entries. The final step is a form (unbound)...
|
by: CloudSolutions |
last post by:
Introduction:
For many beginners and individual users, requiring a credit card and email registration may pose a barrier when starting to use cloud servers. However, some cloud server providers now...
|
by: Defcon1945 |
last post by:
I'm trying to learn Python using Pycharm but import shutil doesn't work
|
by: af34tf |
last post by:
Hi Guys, I have a domain whose name is BytesLimited.com, and I want to sell it. Does anyone know about platforms that allow me to list my domain in auction for free. Thank you
| |