[daisuki]

Hi all,

I'm new here. But, I was wondering if I could get some help with running pthreads in Bloodshed Dev-C++. I downloaded the pthreads.DevPack and installed it, but when I compile my program I'm making for my class I get linker errors.

[Linker error] undefined reference to `_imp__pthread_attr_init'
[Linker error] undefined reference to `_imp__pthread_create'
[Linker error] undefined reference to `_imp__pthread_join'
[Linker error] undefined reference to `_imp__pthread_exit'
[Linker error] undefined reference to `_imp__pthread_mutex_init'
[Linker error] undefined reference to `_imp__pthread_cond_init'
[Linker error] undefined reference to `_imp__pthread_mutex_lock'
[Linker error] undefined reference to `_imp__pthread_mutex_unlock'
[Linker error] undefined reference to `_imp__pthread_exit'
ld returned 1 exit status

I was wondering if anyone could tell me what I could do to fix it.

Thanks,
Emily

[Steelman]

Moved to C/C++

[PurpleHead]

I've the same problem..but i don't understood the answer..Can somebody help me?? Thanks a lot

[TwoD]

Linker errors usually mean that you forgot to link in the .lib files from the libraries you are using. It can also happen if you declare methods in a class, but never define them and then try to use them.

You'll have to tell your IDE in which directories to look for the libs, and also tell it which .lib files it depend upon.

In Visual Studio you can find these settings under Tools->Options->Projects and Solutions->VC++ Directories. Change the Drop-down list to Library files and add the directory with the libs there.

Then go to Project->Projectname Options->Configuration properties->Linker->Input and put the .lib filenames you need under Additional Dependencies. If you need more than one file, separate them with spaces.

[PurpleHead]

i've installed the "pthreads devpack" at http://devpaks.org/details.php?devpak=118
but..it doesn't work..
do you know another way for use the pthread library in dev c++??

Thanks a lot..

Luka

[lord0din69]

You can download pthreads at http://sourceware.org/pthreads-win32/
you can look at the FAQ at the bottom of the website for instructions to install Pthreads. Look for question 8, How do I use pthread.dll for Win32 (Visual C++ 5.0)

Additionally for dev c++ users you need to create a project in order to link the pthreads library.
To do so make a new project, toss the code that you are working on into the project, and then link the pthreads by doing the following

Go to the tab named Project>Project Options (Alt+P)
a window will open up and then go to parameters
and you'll see three sections, compiler, c++ compiler, and linker
add the pthreads into the linker
The files you are looking for is in the folder Pre-built>lib which you have downloaded from http://sourceware.org/pthreads-win32/

Hope that helps

[mctaco]

@lord0din69: Very nice, thank you for this source and help. Some people out there reckon that it is not possible to work with threads in c for windows. I prefer working with Dev C++ due to simplicity when compiling and because of the graphic help it offers....