I met an error when I wrote a gtk program
 

Currently, I am writing an ftp client.
Now I have almost finished it, but meet an error.
In my program, I will create a new thread with pthread to connect the ftp server. But if the created thread is blocked, the main thread will crash, and show such a message:"(gnome_segv:8219): Gtk-WARNING **: Ignoring the separator setting". And the created thread will run correctly.
I do not know why.
Please help me, this problem has troubled me a long time

Have you read this: http://www.gtk.org/faq/#AEN482 ? The example code should help you.