Hi all,
it seems that are two (or more) choices how to work with threads in
gtk. You can #1 use a global lock and call gtk from any thread, or you
can #2 limit your gtk calls to the main loop and not use the global
lock. As far as I understood, method #2 is portable to win32, and
method #1 is not? Is that correct? What are other reasons to choose
for one of these approaches? Are there any other important approaches
that need attention?
regards,
Olivier
--------------------------method #1 -----------------------------------------
#include <glib.h>
#include <gtk/gtk.h>
#include <gdk/gdk.h>
/* this example can call gtk functions from different threads and uses
the global lock.
* this is *not* portable to win32 !!!!!!
*/
static gboolean thread_finished(gpointer data) {
GtkWidget *w=data;
/* because this is called by gdk_threads_idle_add_full the code
* in this function is executed within the global lock. Call gtk
* whenever you want, no need to call gdk_threads_enter() /
gdk_threads_leave()
*/
return FALSE; /* we're done, return FALSE */
}
static gpointer handle_thread(gpointer data) {
/* do things that take a lot of time
you can do anything GTK here provided that you
get the global lock first */
gdk_threads_enter();
/* do anything gtk here */
gdk_threads_leave();
/* an example to call an idle function that will automatically get
the global lock for you */
gdk_threads_idle_add_full(G_PRIORITY_LOW,thread_finished_lcb,
data,NULL);
}
int main(int argc, char **argv) {
GtkWidget *w
GError *gerror=NULL;
g_thread_init();
gdk_threads_init(); /* call gdk_threads_init() if you want to call
gtk from multiple threads */
g_thread_create_full(handle_thread,w,0,FALSE,FALSE,G_THREAD_PRIORITY_LOW,&gerror);
gdk_threads_enter(); /* do gtk things inside the gtk lock */
gtk_init(&argc, &argv);
w = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_widget_show_all(w);
gtk_main();
gdk_threads_leave();
return 0;
}
--------------------------method #2 -----------------------------------------
#include <glib.h>
#include <gtk/gtk.h>
#include <gdk/gdk.h>
/* this example calls gtk functions only in the main loop, and
never calls gtk functions from a thread. */
static gboolean thread_finished(gpointer data) {
GtkWidget *w=data;
/* this is executed in the main loop, not in the thread */
return FALSE; /* we're done, return FALSE */
}
static gpointer handle_thread(gpointer data) {
/* do things that take a lot of time
but don't do anything GTK here */
g_idle_add_full(G_PRIORITY_LOW,thread_finished_lcb, data,NULL);
}
int main(int argc, char **argv) {
GtkWidget *w
GError *gerror=NULL;
g_thread_init();
gtk_init(&argc, &argv);
w = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_widget_show_all(w);
g_thread_create_full(handle_thread,w,0,FALSE,FALSE,G_THREAD_PRIORITY_LOW,&gerror);
gtk_main();
return 0;
}
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