473,231 Members | 1,634 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,231 software developers and data experts.

Threads: does Thread.start() atomically set Thread.__started ?

Can some kind person please further my education on Threads?

When I create a thread called "t" and I do a "t.start()" am I
guaranteed that "t.isAlive()" will return True as long as the thread
hasn't already completed? Put another way, does "t.start()" ever return
before t.__started is set to True?

consider this example:

import time
import threading
class MyThread(threading.Thread):
def __init__(self):
self.completed = False
threading.Thread.__init__(self)
def run(self):
#do something
time.sleep(1)
self.completed = True

t = MyThread()
while t.isAlive() == False and t.completed == False:
t.start()

In the above code, am I guaranteed that t will only be (attempted to
be) started once?
Thanks,
Ryan

Mar 14 '06 #1
2 1154
Enigma Curry wrote:
Can some kind person please further my education on Threads?

When I create a thread called "t" and I do a "t.start()" am I
guaranteed that "t.isAlive()" will return True as long as the thread
hasn't already completed? Put another way, does "t.start()" ever return
before t.__started is set to True?


Did you check the source? It's fairly straightforward, as I recall.
(threading.py in the python library)

-Peter

Mar 15 '06 #2
Peter,

Thanks for the reference! I don't know why but for some reason I
thought that I would be wading through a bunch of C code (which I know
very little of). I haven't found my answer yet but this threading.py
does look fairly straightforward.

Thanks!

Mar 15 '06 #3

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

Similar topics

1
by: python-list | last post by:
Hello, I posted this to the tutor list, but didn't get any responses, unless my email client really messed up. So I'll try here. I'm starting to work with threads, but I'm a little confused. I...
7
by: Mr. Mountain | last post by:
In the following code I simulate work being done on different threads by sleeping a couple methods for about 40 ms. However, some of these methods that should finish in about 40 -80 ms take as long...
6
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...
3
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...
16
by: Thirsty Traveler | last post by:
I would like to create a test harness that simulates multiple concurrent users executing an individual thread. I would like this to be determined at runtime when the user specifies the number of...
3
by: michdoh | last post by:
Hi All I'm looking for some help on creating a basic multi threaded application. i'n new to threads in this environment so for test purposes I've produced a very basic program. (which doesn't...
2
by: Matthew Tylee Atkinson | last post by:
I appear to be having some problems with the isAlive() method of detecting if a thread is alive/active/running or not. I'd be grateful for any advice. I have a visualisation program (which uses...
12
by: Dave | last post by:
Hi all, I have an application which has some worker threads which often have to stop and wait for some further information from other threads. These pauses will often take a long time (a couple...
23
by: =?GB2312?B?0rvK18qr?= | last post by:
Hi all, Recently I had a new coworker. There is some dispute between us. The last company he worked for has a special networking programming model. They split the business logic into...
0
by: VivesProcSPL | last post by:
Obviously, one of the original purposes of SQL is to make data query processing easy. The language uses many English-like terms and syntax in an effort to make it easy to learn, particularly for...
3
isladogs
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 3 Jan 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). For other local times, please check World Time Buddy In...
0
by: abbasky | last post by:
### Vandf component communication method one: data sharing ​ Vandf components can achieve data exchange through data sharing, state sharing, events, and other methods. Vandf's data exchange method...
0
by: fareedcanada | last post by:
Hello I am trying to split number on their count. suppose i have 121314151617 (12cnt) then number should be split like 12,13,14,15,16,17 and if 11314151617 (11cnt) then should be split like...
0
by: stefan129 | last post by:
Hey forum members, I'm exploring options for SSL certificates for multiple domains. Has anyone had experience with multi-domain SSL certificates? Any recommendations on reliable providers or specific...
0
by: MeoLessi9 | last post by:
I have VirtualBox installed on Windows 11 and now I would like to install Kali on a virtual machine. However, on the official website, I see two options: "Installer images" and "Virtual machines"....
0
by: DolphinDB | last post by:
The formulas of 101 quantitative trading alphas used by WorldQuant were presented in the paper 101 Formulaic Alphas. However, some formulas are complex, leading to challenges in calculation. Take...
0
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...
0
by: Aftab Ahmad | last post by:
Hello Experts! I have written a code in MS Access for a cmd called "WhatsApp Message" to open WhatsApp using that very code but the problem is that it gives a popup message everytime I clicked on...

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.