More to the point if I create a window, for example, in a thread other than the GTK one, it becomes unresponsive. Other GTK calls (that don't create widgets) seem to work fine, however.
I've attached a sample program to show what I mean, the flag "create_in_gt" sets whether to create the widgets in the GTK thread or in the main one.
Is this normal behaviour, am I not supposed to do this, or is it a bug?
(NOTE: The first time I've sent this message it was detected as spam so I'll include the file instead of attaching it)
threadtest1.cpp:
#include <gtk/gtk.h>
const int create_in_gt = FALSE; // Whether to create the widgets in the GTK thread.
GtkWidget *win, *but;
// Creates a window with a button in it.
// This function will be called in the GTK thread if "create_in_gt" is TRUE
// or in the main thread otherwise.
int create_widgets(void*) {
win = gtk_window_new(GTK_WINDOW_TOPLEVEL);
but = gtk_button_new_with_label("My Button");
gtk_container_add(GTK_CONTAINER(win),but);
gtk_widget_show_all(win);
return FALSE;
}
// The GTK thread function
void* gtkthread(void *) {
gdk_threads_enter(); // GTK calls to follow - locking.
// Inits gtk in this thread (I have tried initing it in both threads, the
// result is the same.)
gtk_init(NULL,NULL);
// Creates the widgets if neccesary and then enters the main loop.
if( create_in_gt ) create_widgets(NULL);
gtk_main();
gdk_threads_leave(); // GTK calls end here - unlocking
}
int main(int argc, char *argv[]) {
g_thread_init(NULL); // Init threads in main thread.
gdk_threads_init();
// Creates the GTK thread.
GThread *gt = g_thread_create(gtkthread, NULL, TRUE,NULL);
// Waits 1 second, creates widgets if neccesary then, waits 2 more seconds.
g_usleep( 1000000 );
if( !create_in_gt )
g_idle_add(create_widgets,NULL);
g_usleep( 2000000 );
gdk_threads_enter(); // Quits GTK safely.
gtk_main_quit();
gdk_threads_leave();
g_thread_join(gt); // Waits for GTK to quit.
return 0;
}
--
Cristi Cobzarenco
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