473,804 Members | 3,383 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Why not work POSIX::RT:Semap hore

This is my simple code

#!/usr/local/bin/perl
use threads;
use threads::shared ;
use POSIX::RT::Sema phore;

$sem = POSIX::RT::Sema phore->init(0, 0);

my $pid = fork;
if ( $pid == 0 )
{
$sem->wait;
print "CODE2\n";
exit;
}

print "CODE1\n";
$sem->post;
Why I see only CODE1???
Why after post in parent process semaphore value in child process was't changed?
Jul 19 '05 #1
0 2570

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

Similar topics

7
4863
by: Jonas | last post by:
This works fine in Win XP but does not work at all in Win 98. Private WithEvents objIExplorer As InternetExplorer I have to do it like this to get it to work in Win 98 Dim objIExplorer As InternetExplorer But then I cant see when a user exit my objIExplorer and than an error will show up when I try to open a link in the IE window that does not exist... What can I do about this and way does it not work in win 98?
3
3052
by: Douglas Buchanan | last post by:
Buttons don't work if form is opened on startup A2k If 'frmMain' is set to open by default at startup none of the buttons work. If 'frmMain' is opened from the database window then all the buttons work. The form's name ('frmMain') is selected from in the Startup dialog box.
4
2086
by: Paul T. RONG | last post by:
Dear All, I add two new tables to the database and then the disable shift key codes don't work. These two new tables are actually created by two queries, and only these two are in the front end, I didn't manage to move them to the back end. I work with Access 2k under Win XP. these are the codes that don't work (it worked for more than a year very well):
6
1885
by: benb | last post by:
I have form that looks a lot like a search bar for the user to search for records matching specified criteria (e.g. first names containing "ben"). For robust results, an intermediary form displays all records matching the criteria (hmm...sound like a popular web site I know). Here is the immediate problem: my code (below) works fine on my computer, but on some of those belonging to my work colleagues (who will be the end users of the db)...
15
1914
by: Brett | last post by:
I'd like to know what management and the work environment are like where you work. I need something relative to compare my current work environment. Here's a few questions I have: 1.) Is it normal for (technical) management (actually 1 of 2 co owners) to constantly interrupt developers all day with with questions such as: "can we look at this", "I found this, can we try it now", "Can we see what these guys are doing", "can we change...
2
7727
by: Holysmoke | last post by:
Hi, I have a asp.net form with a button in it. In the onlclick event of button I want to write a function which does some a bit of work with a timespan of 15 seconds. So I want to show a image something like "Work In Progress" when this process is going on and hide it when the work done I do something like this button click event
3
5058
by: musosdev | last post by:
Hi guys Okay, I've setup my projects to open and compile fine in VS2005 using FPSE and remote web, but it's *really* slow. So I thought I'd have a go at doing it the normal way, by loading from the network share. It loads in VS2005 fine, and I can edit and save code changes etc, but when I try and Build the solution, I get the following error... An error occured loading a configuration file: Failed to start monitoring
33
2008
by: bonk | last post by:
I have an application that needs to perform some background work, i.e. Logging, wich must not block the main thread. How would I basically design such a scenario? It is obvious that I should do that on an extra thread but I think it is a bad idea to spawn a new thread everytime a log-message is written and let it die once the message was written. But how do I keep a thread alive and trigger the log-messages and pass the string to that...
11
53131
Niheel
by: Niheel | last post by:
http://bytes.com/images/howtos/information_overloaded.jpgPaul Graham wrote an interesting article a few months back about how the internet is leading to information overload for information workers of today. He is not alone in his thinking. Similarly, In July of 2008 IBM, Intel, Microsoft and Xerox announced that they were joining forces with Information Overload Research Group(http://www.iorgforum.org/) to combat one of the greatest...
0
10564
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. Here is my compilation command: g++-12 -std=c++20 -Wnarrowing bit_field.cpp Here is the code in...
0
10320
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 captivates audiences and drives business growth. The Art of Business Website Design Your website is...
0
10073
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 choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
0
9134
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 launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
1
7609
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...
0
5645
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
1
4288
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
2
3806
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
3
2981
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 effective websites that not only look great but also perform exceptionally well. In this comprehensive...

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.