X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=gio%2Fgasyncresult.c;h=0c18b0b40870b877f07f95c1c9256940f391e9a1;hb=2138deb07ebb7d7e541c0cd35b966e107d1bf800;hp=aec48d6fffff0f6cad61b532de8252e777f57996;hpb=631d0c3534661e549f7df18fbb9832bdf19c5eaf;p=platform%2Fupstream%2Fglib.git

diff --git a/gio/gasyncresult.c b/gio/gasyncresult.c
index aec48d6..0c18b0b 100644
--- a/gio/gasyncresult.c
+++ b/gio/gasyncresult.c
@@ -13,15 +13,14 @@
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General
- * Public License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
- * Boston, MA 02111-1307, USA.
+ * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
  *
  * Author: Alexander Larsson <alexl@redhat.com>
  */
 
 #include "config.h"
 #include "gasyncresult.h"
+#include "gsimpleasyncresult.h"
 #include "glibintl.h"
 
 
@@ -29,7 +28,7 @@
  * SECTION:gasyncresult
  * @short_description: Asynchronous Function Results
  * @include: gio/gio.h
- * @see_also: #GSimpleAsyncResult
+ * @see_also: #GTask
  *
  * Provides a base class for implementing asynchronous function results.
  *
@@ -51,15 +50,17 @@
  * "enumerate children" operation). If the result or error status of the
  * operation is not needed, there is no need to call the "_finish()"
  * function; GIO will take care of cleaning up the result and error
- * information after the #GAsyncReadyCallback returns. Applications may
- * also take a reference to the #GAsyncResult and call "_finish()"
- * later; however, the "_finish()" function may be called at most once.
+ * information after the #GAsyncReadyCallback returns. You can pass
+ * %NULL for the #GAsyncReadyCallback if you don't need to take any
+ * action at all after the operation completes. Applications may also
+ * take a reference to the #GAsyncResult and call "_finish()" later;
+ * however, the "_finish()" function may be called at most once.
  *
  * Example of a typical asynchronous operation flow:
- * |[
+ * |[<!-- language="C" -->
  * void _theoretical_frobnitz_async (Theoretical         *t,
  *                                   GCancellable        *c,
- *                                   GAsyncReadyCallback *cb,
+ *                                   GAsyncReadyCallback  cb,
  *                                   gpointer             u);
  *
  * gboolean _theoretical_frobnitz_finish (Theoretical   *t,
@@ -80,20 +81,20 @@
  *   else
  *     g_printf ("Uh oh!\n");
  *
- *   /<!-- -->* ... *<!-- -->/
+ *   ...
  *
  * }
  *
  * int main (int argc, void *argv[])
  * {
- *    /<!-- -->* ... *<!-- -->/
+ *    ...
  *
  *    _theoretical_frobnitz_async (theoretical_data,
  *                                 NULL,
  *                                 frobnitz_result_func,
  *                                 NULL);
  *
- *    /<!-- -->* ... *<!-- -->/
+ *    ...
  * }
  * ]|
  *
@@ -101,12 +102,16 @@
  * always called, even in the case of a cancelled operation. On cancellation
  * the result is a %G_IO_ERROR_CANCELLED error.
  *
- * Some asynchronous operations are implemented using synchronous calls.
- * These are run in a separate thread, if #GThread has been initialized, but
- * otherwise they are sent to the Main Event Loop and processed in an idle
- * function. So, if you truly need asynchronous operations, make sure to
- * initialize #GThread.
- **/
+ * ## I/O Priority # {#io-priority}
+ *
+ * Many I/O-related asynchronous operations have a priority parameter,
+ * which is used in certain cases to determine the order in which
+ * operations are executed. They are not used to determine system-wide
+ * I/O scheduling. Priorities are integers, with lower numbers indicating
+ * higher priority. It is recommended to choose priorities between
+ * %G_PRIORITY_LOW and %G_PRIORITY_HIGH, with %G_PRIORITY_DEFAULT
+ * as a default.
+ */
 
 typedef GAsyncResultIface GAsyncResultInterface;
 G_DEFINE_INTERFACE (GAsyncResult, g_async_result, G_TYPE_OBJECT)
@@ -156,3 +161,72 @@ g_async_result_get_source_object (GAsyncResult *res)
 
   return (* iface->get_source_object) (res);
 }
+
+/**
+ * g_async_result_legacy_propagate_error:
+ * @res: a #GAsyncResult
+ * @error: (out): a location to propagate the error to.
+ *
+ * If @res is a #GSimpleAsyncResult, this is equivalent to
+ * g_simple_async_result_propagate_error(). Otherwise it returns
+ * %FALSE.
+ *
+ * This can be used for legacy error handling in async *_finish()
+ * wrapper functions that traditionally handled #GSimpleAsyncResult
+ * error returns themselves rather than calling into the virtual method.
+ * This should not be used in new code; #GAsyncResult errors that are
+ * set by virtual methods should also be extracted by virtual methods,
+ * to enable subclasses to chain up correctly.
+ *
+ * Returns: %TRUE if @error is has been filled in with an error from
+ *   @res, %FALSE if not.
+ *
+ * Since: 2.34
+ **/
+gboolean
+g_async_result_legacy_propagate_error (GAsyncResult  *res,
+				       GError       **error)
+{
+  /* This doesn't use a vmethod, because it's only for code that used
+   * to use GSimpleAsyncResult. (But it's a GAsyncResult method so
+   * that callers don't need to worry about GSimpleAsyncResult
+   * deprecation warnings in the future.)
+   */
+
+  if (G_IS_SIMPLE_ASYNC_RESULT (res))
+    {
+      return g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (res),
+						    error);
+    }
+  else
+    return FALSE;
+}
+
+/**
+ * g_async_result_is_tagged:
+ * @res: a #GAsyncResult
+ * @source_tag: an application-defined tag
+ *
+ * Checks if @res has the given @source_tag (generally a function
+ * pointer indicating the function @res was created by).
+ *
+ * Returns: %TRUE if @res has the indicated @source_tag, %FALSE if
+ *   not.
+ *
+ * Since: 2.34
+ **/
+gboolean
+g_async_result_is_tagged (GAsyncResult  *res,
+			  gpointer       source_tag)
+{
+  GAsyncResultIface *iface;
+
+  g_return_val_if_fail (G_IS_ASYNC_RESULT (res), FALSE);
+
+  iface = G_ASYNC_RESULT_GET_IFACE (res);
+
+  if (!iface->is_tagged)
+    return FALSE;
+
+  return (* iface->is_tagged) (res, source_tag);
+}