Re: Problems with output in a multithreaded program

Hi, I try to write here because maybe my problem is a common one.

I have a rather complicated multithreaded program, which uses the POSIX
pthread standard.
A master routine calls a series of slave routines.

My problems is about output. If I use the standard syntax:

....
cout << "Hi, I am thread number" << i << endl;
....

anything goes right. But if instead I try to send the output to a file,
opened in the usual way:

....
out.open("Calcolo_Parallelo.log", ios::app);
....

....
out << "Hi, I am thread number" << i << endl;
....

sometimes the output is not written. I haven't understood which lines
of code are written and which others not, but approximately a 50% of
the total output requested is missed (and where is it finished???).

Somebody has an idea of how to solve this problem?