#include <gtk/gtk.h>

typedef long CleanInt;

void *safe_malloc(size_t n) {
	void *ptr=malloc (n);
	if (ptr==NULL)
		perror ("malloc");
	return ptr;
}

struct clean_g_signal {
	GtkWidget *target;
	CleanInt id;
	struct clean_g_signal *next;
};

static struct clean_g_signal *signal_queue=NULL;
static struct clean_g_signal *last_signal=NULL;

static struct clean_g_signal *clean_g_signal_push (void) {
	struct clean_g_signal *signal=safe_malloc (sizeof(struct clean_g_signal));

	if (last_signal!=NULL)
		last_signal->next=signal;
	else if (signal_queue==NULL)
		signal_queue=signal;

	last_signal=signal;

	return signal;
}

struct clean_g_signal *clean_g_signal_pop (void) {
	struct clean_g_signal *signal=signal_queue;

	if (signal_queue==NULL)
		last_signal=NULL;

	signal_queue=NULL;

	return signal;
}

static void clean_g_signal_handler_void (GtkWidget *target,gpointer data) {
	struct clean_g_signal *signal=clean_g_signal_push();
	signal->target=target;
	signal->id=(CleanInt)data;
}

void clean_g_signal_connect_void (GtkWidget *widget,char *signal,CleanInt id) {
	g_signal_connect (widget,signal,G_CALLBACK (clean_g_signal_handler_void),(gpointer)id);
}