On Tue, 09 Nov 1999 19:04:36 +0400, [EMAIL PROTECTED] wrote:
> Trog wrote:
>> Erik, the gtk-thread example seems to have escaped my attention,
>> could you send it to me please.
>
> Me too please :) as now I use idle functions and in doubts whether
> it is 100% safe.
To avoid a "me too" storm, here it is again, with the code changes from
Sebastian and Owen.
Erik
--
J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department
of Electrical Engineering, Faculty of Information Technology and Systems,
Delft University of Technology, PO BOX 5031, 2600 GA Delft, The Netherlands
Phone: +31-15-2785859 Fax: +31-15-2781843 Email [EMAIL PROTECTED]
WWW: http://www-ict.its.tudelft.nl/~erik/
/*-------------------------------------------------------------------------
* Filename: gtk-thread.c
* Version: 0.99.1
* Copyright: Copyright (C) 1999, Erik Mouw
* Author: Erik Mouw <[EMAIL PROTECTED]>
* Description: GTK threads example.
* Created at: Sun Oct 17 21:27:09 1999
* Modified by: Erik Mouw <[EMAIL PROTECTED]>
* Modified at: Sun Oct 24 17:21:41 1999
*-----------------------------------------------------------------------*/
/*
* Compile with:
*
* cc -o gtk-thread gtk-thread.c `gtk-config --cflags --libs gthread`
*
* Thanks to Sebastian Wilhelmi and Owne Taylor for pointing out some
* bugs.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <gtk/gtk.h>
#include <glib.h>
#include <pthread.h>
#define YES_IT_IS (1)
#define NO_IT_IS_NOT (0)
typedef struct
{
GtkWidget *label;
int what;
} yes_or_no_args;
G_LOCK_DEFINE_STATIC (yes_or_no);
static volatile int yes_or_no = YES_IT_IS;
void destroy(GtkWidget *widget, gpointer data)
{
gtk_main_quit();
}
void *argument_thread(void *args)
{
yes_or_no_args *data = (yes_or_no_args *)args;
gboolean say_something;
for(;;)
{
/* sleep a while */
sleep(rand() / (RAND_MAX / 3) + 1);
/* lock the yes_or_no_variable */
G_LOCK(yes_or_no);
/* do we have to say something? */
say_something = (yes_or_no != data->what);
if(say_something)
{
/* set the variable */
yes_or_no = data->what;
}
/* Unlock the yes_or_no variable */
G_UNLOCK(yes_or_no);
if(say_something)
{
/* get GTK thread lock */
gdk_threads_enter();
/* set label text */
if(data->what == YES_IT_IS)
gtk_label_set_text(GTK_LABEL(data->label), "O yes, it is!");
else
gtk_label_set_text(GTK_LABEL(data->label), "O no, it isn't!");
/* release GTK thread lock */
gdk_threads_leave();
}
}
return(NULL);
}
int main(int argc, char *argv[])
{
GtkWidget *window;
GtkWidget *label;
yes_or_no_args yes_args, no_args;
pthread_t no_tid, yes_tid;
/* init threads */
g_thread_init(NULL);
/* init gtk */
gtk_init(&argc, &argv);
/* init random number generator */
srand((unsigned int)time(NULL));
/* create a window */
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_signal_connect(GTK_OBJECT (window), "destroy",
GTK_SIGNAL_FUNC(destroy), NULL);
gtk_container_set_border_width(GTK_CONTAINER (window), 10);
/* create a label */
label = gtk_label_new("And now for something completely different ...");
gtk_container_add(GTK_CONTAINER(window), label);
/* show everything */
gtk_widget_show(label);
gtk_widget_show (window);
/* create the threads */
yes_args.label = label;
yes_args.what = YES_IT_IS;
pthread_create(&yes_tid, NULL, argument_thread, &yes_args);
no_args.label = label;
no_args.what = NO_IT_IS_NOT;
pthread_create(&no_tid, NULL, argument_thread, &no_args);
/* enter the GTK main loop */
gdk_threads_enter();
gtk_main();
gdk_threads_leave();
return(0);
}
i
