#define SURF_TYPE_COOKIE_JAR           (surf_cookie_jar_get_type ())
#define SURF_COOKIE_JAR(obj)           (G_TYPE_CHECK_INSTANCE_CAST ((obj), SURF_TYPE_COOKIE_JAR, SurfCookieJar))

typedef struct {
  SoupCookieJarText parent_instance;
  int lock;
} SurfCookieJar;

typedef struct {
  SoupCookieJarTextClass parent_class;
} SurfCookieJarClass;

G_DEFINE_TYPE(SurfCookieJar, surf_cookie_jar, SOUP_TYPE_COOKIE_JAR_TEXT)

static void
surf_cookie_jar_init(SurfCookieJar *self) {
  self->lock = open(cookiefile, 0);
}

static void
surf_cookie_jar_changed(SoupCookieJar *self, SoupCookie *old_cookie, SoupCookie *new_cookie) {
	flock(SURF_COOKIE_JAR(self)->lock, LOCK_EX);
	if(new_cookie && !new_cookie->expires && sessiontime)
		soup_cookie_set_expires(new_cookie, soup_date_new_from_now(sessiontime));
  SOUP_COOKIE_JAR_CLASS(surf_cookie_jar_parent_class)->changed(self, old_cookie, new_cookie);
	flock(SURF_COOKIE_JAR(self)->lock, LOCK_UN);
}

static void
surf_cookie_jar_set_property(GObject *self, guint prop_id, const GValue *value, GParamSpec *pspec) {
	flock(SURF_COOKIE_JAR(self)->lock, LOCK_SH);
  // parent class loads entire file into hash table at once
  G_OBJECT_CLASS(surf_cookie_jar_parent_class)->set_property(self, prop_id, value, pspec);
	flock(SURF_COOKIE_JAR(self)->lock, LOCK_UN);
}

static void
surf_cookie_jar_finalize(GObject *self) {
  close(SURF_COOKIE_JAR(self)->lock);
  G_OBJECT_CLASS(surf_cookie_jar_parent_class)->finalize(self);
}

static void
surf_cookie_jar_class_init(SurfCookieJarClass *klass) {
  SOUP_COOKIE_JAR_CLASS(klass)->changed = surf_cookie_jar_changed;
  G_OBJECT_CLASS(klass)->get_property = G_OBJECT_CLASS(surf_cookie_jar_parent_class)->get_property;
  G_OBJECT_CLASS(klass)->set_property = surf_cookie_jar_set_property;
  G_OBJECT_CLASS(klass)->finalize = surf_cookie_jar_finalize;
  g_object_class_override_property(G_OBJECT_CLASS(klass), 1, "filename");
}

static SoupCookieJar *
surf_cookie_jar_new(const char *filename, gboolean read_only) {
  return g_object_new(SURF_TYPE_COOKIE_JAR,
                      SOUP_COOKIE_JAR_TEXT_FILENAME, filename,
                      SOUP_COOKIE_JAR_READ_ONLY, read_only, NULL);
}