Re: Text box problems

[Jonathan Irwin <jmi25 cam ac uk>]

On 12 Jan 2001, Chris Nuernberger wrote:

> Ok here is the problem, you were right to suggest it is with threads.  I follow
>
> the faq regarding threads, and all it mentions are three functions,
> g_thread_init, gdk_thread_[enter/leave].  Using these functions makes no
> difference, here is the program if
> you want to see for yourself.

<code snipped>

You need to gdk_threads_enter() before you use any GTK or GDK functions in
a thread as well, so your function make_textbox() needs to start with
gdk_threads_enter() and end with gdk_threads_leave() [these functions
control a global mutex which ensures only one process calls Xlib or
modifies any global data for GTK/GDK simeltaneously].  Currently you are
doing main() correctly, but when the thread function make_textbox() gets
called, the gtk_main() loop is still running because you haven't locked
the mutex [hence it tries to access Xlib at the same time as your thread,
giving the error].

Hope this helps

Jonathan