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icu222much 8Feb2010 04:46

sem.h Problem
I am trying to program with semaphores and was told that I should use sem.h. When I compile, I get the error: "sys/sem.h: No such file or directory". How can I fix my problem?


#include <stdio.h>
#include <sys/sem.h>

int main() {
    printf("I am alive \n");
    return 0;

shabbir 8Feb2010 07:56

Re: sem.h Problem
Remove that line

icu222much 8Feb2010 10:17

Re: sem.h Problem
Removing that line would get rid of the error, but I still would like to use semaphores.

shabbir 8Feb2010 10:33

Re: sem.h Problem

Originally Posted by icu222much (Post 63971)
Removing that line would get rid of the error, but I still would like to use semaphores.

But if that file isn't there in your system and so having that file is not the way out.

icu222much 8Feb2010 11:13

Re: sem.h Problem
How would I get that file onto my computer?

I found sem.h, downloaded it, and placed it in the directory (C:\Program Files (x86)\CodeBlocks\MinGW\include). When I ran my program, the compiler said there were lots of problems with sem.h. After doing some research, I found out that I can't just add sem.h as this is just a 'pointer' file which is suppose to point to the actual code behind this function. I am trying to find how to get the actual code on my computer.

Sorry, I am very new to programming in C.

shabbir 8Feb2010 16:41

Re: sem.h Problem
If you are new try your hands on basics as that file may be in some external package which you may need to install

xpi0t0s 9Feb2010 12:24

Re: sem.h Problem
Semaphores are done differently on Windows than on Unix/Linux. sem.h and the related libraries are Unix. If you're programming Windows then you'll need to know about MSDN. Here's a demo program for semaphores on MSDN:


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