?
Solved

Global variables

Posted on 1998-07-22
2
Medium Priority
?
284 Views
Last Modified: 2010-04-15
I have the following declaration in the header file of my project. This header file is included in every source file of the project. At one point in my main routine, I set this pointer to an address. After that, I start a series of threads that use the pointer. The problem is, some of the routines I call don't show the value I set prior to calling them but instead show NULL (the pointer's compile time value). What's wrong?

...
static struct CONNLIST *pProcessList = NULL;
...
0
Comment
Question by:flfmdll
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 5

Accepted Solution

by:
yonat earned 80 total points
ID: 1251781
"static" means file scope. So there is a separate pProcessList for each file that #includes this header. Replace "static" with "extern" in the header:
    extern struct CONNLIST *pProcessList;
and define the variable in just *one* of your .c files:
    struct CONNLIST *pProcessList = NULL;

0
 

Author Comment

by:flfmdll
ID: 1251782
Thank you. That works just fine. My excuse: it's been a very long time since I have used global variables.
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

An Outlet in Cocoa is a persistent reference to a GUI control; it connects a property (a variable) to a control.  For example, it is common to create an Outlet for the text field GUI control and change the text that appears in this field via that Ou…
Windows programmers of the C/C++ variety, how many of you realise that since Window 9x Microsoft has been lying to you about what constitutes Unicode (http://en.wikipedia.org/wiki/Unicode)? They will have you believe that Unicode requires you to use…
The goal of this video is to provide viewers with basic examples to understand opening and writing to files in the C programming language.
The goal of this video is to provide viewers with basic examples to understand opening and reading files in the C programming language.
Suggested Courses

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question