Hi guys,

I am a C# dev (as far as my job goes). recently I started trying out C. i preferred linux to be the better platform for C codes.

Problem is: I have never done anything on compiling C codes more than standard "cc xyz.c -o xyz.exe"

Now that I have used #include<semaphore.h> in my code, it not compiling any more. cc -c is working though.
the command executed looks like: cc main.c -o synchronize.exe
I do not remember the exact error message, but it's something like
definition for sem_init not found, or undefined sem_init referred to.... something in the same line.

I am not exactly sure of what exactly to do here.

I am using slackware version 10.1. [default installation(full)]

Thanks in advance.

What platform are you on? What compiler are you using? I notice you are trying to compile a .exe.

Can you show us your source code? Just including this header should not cause your source code not to compile.

You need to link to the POSIX thread library, so add -pthread to gcc options. When you're facing this kind of problem, read the manual: "man sem_init" to display the sem_init online manual... "man" is another good reason for using an UNIX system to do C development...

Hi,

Thanks for the info.
Including -lpthread did it.

As for the man pages, I was actually trying out with the info pages. But I guess man pages are better than info's.

Thanks again, as I solved the compilation issue, and am into a runtime issue now.
Anyways, the semaphores are working fine now...