On Mon, 2006-02-06 at 11:22, Michael Torrie wrote:
> I have attached a sample file that uses threads in the way you described
> in your last post.
I generally like to make code examples compile without warning. Did you
even try to compile this?
________________________________________________________________________
> #include <stdio.h>
> #include <stdlib.h>
> #include <gtk/gtk.h>
> #include <glib.h>
> #include <pthread.h>
#include <unistd.h> /* sleep() - on Unix, anyway */
> gint thread_count=0;
> gint dead_threads;
>
> GSList *threads;
>
> struct thread_info_data {
> GtkTextBuffer *buffer;
> gint id;
> pthread_t tid;
> gint terminate;
> };
>
> void thread (void *data) {
void * thread(void *data) {
> struct thread_info_data *info;
> GtkTextIter iter;
> GString *message;
>
>
> info=(struct thread_info_data *)data;
> message=g_string_new("");
>
> while(info->terminate == 0 ) {
> sleep(1);
> g_string_printf(message,"Thread %d here.\n",info->id);
> g_print("%s",message->str);
>
> gdk_threads_enter();
> gtk_text_buffer_get_end_iter(info->buffer,&iter);
> gtk_text_buffer_insert(info->buffer,&iter,message->str,-1);
> gdk_threads_leave();
> }
> g_print("Thread %d stopping.\n",info->id);
> gdk_threads_enter(); //borrowing a lock from gtk to lock our variable
> dead_threads++;
> gdk_threads_leave(); //we could and should use a counting semaphore
> g_string_free(message,NULL);
g_string_free(message,FALSE); /* Hope NULL means FALSE here */
return 0;
> }
>
> void stop_thread(gpointer data, gpointer user_data) {
> struct thread_info_data *thread;
>
> thread=data;
> thread->terminate=1;
> g_print("Asked thread %d to stop.\n",thread->id);
>
> //here we ought to make sure the thread really has died
> // pthread_join(thread->tid,NULL);
> }
>
> void on_destroy(GtkWidget *widget, gpointer data) {
> g_slist_foreach(threads,stop_thread,NULL);
>
> while(dead_threads < thread_count) {
> while(gtk_events_pending()) {
> gtk_main_iteration();
> }
> sleep(0);
> }
> gtk_main_quit();
> }
>
> void on_button_clicked(GtkWidget *widget, gpointer data) {
> GtkTextBuffer *buffer;
> GtkTextIter iter;
> struct thread_info_data *thread_info;
>
> buffer=GTK_TEXT_BUFFER(data);
>
> thread_info=g_malloc(sizeof(struct thread_info_data));
> thread_info->buffer=buffer;
> thread_info->id=thread_count++;
> thread_info->terminate=0;
>
> threads=g_slist_append(threads,thread_info);
>
> pthread_create(&(thread_info->tid),NULL,thread,thread_info);
>
>
> gtk_text_buffer_get_end_iter(buffer,&iter);
> gtk_text_buffer_insert(buffer,&iter,"Button clicked!\n",-1);
> g_print("Button clicked.\n");
>
>
> }
>
>
> int main(int argc, char *argv[]) {
> GtkWidget *window;
> GtkWidget *button;
> GtkWidget *vbox;
> GtkWidget *viewarea;
> GtkWidget *view;
> GtkWidget *buffer;
GtkTextBuffer *buffer; /* GtkTextBuffer doesn't inherit from GtkWidget!
*/
> threads=NULL;
>
>
> g_thread_init (NULL);
> gdk_threads_init ();
>
> gtk_init(&argc, &argv);
>
> window=gtk_window_new(GTK_WINDOW_TOPLEVEL);
>
> gtk_signal_connect(GTK_OBJECT(window),"destroy",
> GTK_SIGNAL_FUNC(on_destroy),NULL);
> gtk_container_set_border_width(GTK_CONTAINER(window),10);
>
> vbox=gtk_vbox_new(FALSE,5);
> gtk_container_add(GTK_CONTAINER(window),vbox);
> gtk_widget_show(vbox);
>
> viewarea=gtk_scrolled_window_new(NULL,NULL);
> gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(viewarea),
> GTK_POLICY_AUTOMATIC,
> GTK_POLICY_AUTOMATIC);
> gtk_box_pack_start(GTK_BOX(vbox),viewarea,TRUE,TRUE,2);
> gtk_widget_show(viewarea);
>
> view=gtk_text_view_new();
>
> buffer=gtk_text_view_get_buffer(GTK_TEXT_VIEW(view));
>
> gtk_text_buffer_set_text(buffer,"The threads will write here.\n",-1);
> gtk_container_add(GTK_CONTAINER(viewarea),view);
> gtk_widget_show(view);
>
> button=gtk_button_new_with_label("Click me");
> gtk_signal_connect(GTK_OBJECT(button),"clicked",
> GTK_SIGNAL_FUNC(on_button_clicked),buffer);
>
> gtk_box_pack_end(GTK_BOX(vbox),button,FALSE,FALSE,3);
>
> gtk_widget_show(button);
> gtk_widget_show(window);
>
> gdk_threads_enter ();
> gtk_main();
> gdk_threads_leave ();
>
> return 0;
> }
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