Threads and fstream

[toast28]

Can someone (read: Valmont,lol) explain to me how to share an open fstream between 2 threads in a multithreaded program? I tried declaring it as a global outfile, but when it gets to the function in another file it says it doesn't recognize the variable outfile. My teacher said something about declaring it a pointer to a fstream then dereferencing it in the function, but I haven't had any luck doing that yet.

The program is fundementally simple, output greeting message, start thread, get 2 random nums, wait for child, output both nums and child threads id. The thread runs function void* getnumbers (void* data), which generates random nums, outputs this threads id and numbers to file, then returns numbers.

I hope you can explain this to me.

[Valmont]

Threads are not supported by the standard, so I don't support them either.
However, your hint is that you can declare the stream static. In that case the stream will be shared by all threads.
You can call the member function that is shared between threads.
Are you using posix as well?

[toast28]

I am using Posix theads, its on a FreeBDS system, if that makes a differnce.

I'll try the static idea, do I still need to declare it as a pointer then?