gio/gsimpleasyncresult.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright (C) 2006-2007 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: Alexander Larsson <alexl@redhat.com>
  21  */
  22
  23 #include <config.h>
  24
  25 #include <sys/types.h>
  26 #include <sys/stat.h>
  27 #include <string.h>
  28 #include <errno.h>
  29 #include <fcntl.h>
  30 #ifdef HAVE_UNISTD_H
  31 #include <unistd.h>
  32 #endif
  33
  34 #include "gsimpleasyncresult.h"
  35 #include "gioscheduler.h"
  36 #include <gio/gioerror.h>
  37 #include "glibintl.h"
  38
  39 #include "gioalias.h"
  40
  41 /**
  42  * SECTION:gsimpleasyncresult
  43  * @short_description: Simple asynchronous results implementation
  44  * @include: gio/gio.h
  45  * @see_also: #GAsyncResult
  46  *
  47  * Implements #GAsyncResult for simple cases. Most of the time, this
  48  * will be all an application needs, and will be used transparently.
  49  * Because of this, #GSimpleAsyncResult is used throughout GIO for
  50  * handling asynchronous functions.
  51  *
  52  * GSimpleAsyncResult handles #GAsyncReadyCallback<!-- -->s, error
  53  * reporting, operation cancellation and the final state of an operation,
  54  * completely transparent to the application. Results can be returned
  55  * as a pointer e.g. for functions that return data that is collected
  56  * asynchronously, a boolean value for checking the success or failure
  57  * of an operation, or a #gssize for operations which return the number
  58  * of bytes modified by the operation; all of the simple return cases
  59  * are covered.
  60  *
  61  * Most of the time, an application will not need to know of the details
  62  * of this API; it is handled transparently, and any necessary operations
  63  * are handled by #GAsyncResult's interface. However, if implementing a
  64  * new GIO module, for writing language bindings, or for complex
  65  * applications that need better control of how asynchronous operations
  66  * are completed, it is important to understand this functionality.
  67  *
  68  * GSimpleAsyncResults are tagged with the calling function to ensure
  69  * that asynchronous functions and their finishing functions are used
  70  * together correctly.
  71  *
  72  * To create a new #GSimpleAsyncResult, call g_simple_async_result_new().
  73  * If the result needs to be created for a #GError, use
  74  * g_simple_async_result_new_from_error(). If a #GError is not available
  75  * (e.g. the asynchronous operation's doesn't take a #GError argument),
  76  * but the result still needs to be created for an error condition, use
  77  * g_simple_async_result_new_error() (or g_simple_async_result_set_error_va()
  78  * if your application or binding requires passing a variable argument list
  79  * directly), and the error can then be propegated through the use of
  80  * g_simple_async_result_propagate_error().
  81  *
  82  * An asynchronous operation can be made to ignore a cancellation event by
  83  * calling g_simple_async_result_set_handle_cancellation() with a
  84  * #GSimpleAsyncResult for the operation and %FALSE.
  85  *
  86  * GSimpleAsyncResult can integrate into GLib's event loop, #GMainLoop,
  87  * or it can use #GThread<!-- -->s if available.
  88  * g_simple_async_result_complete() will finish an I/O task directly within
  89  * the main event loop. g_simple_async_result_complete_in_idle() will
  90  * integrate the I/O task into the main event loop as an idle function and
  91  * g_simple_async_result_run_in_thread() will run the job in a separate
  92  * thread.
  93  *
  94  * To set the results of an asynchronous function,
  95  * g_simple_async_result_set_op_res_gpointer(),
  96  * g_simple_async_result_set_op_res_gboolean(), and
  97  * g_simple_async_result_set_op_res_gssize()
  98  * are provided, setting the operation's result to a gpointer, gboolean, or
  99  * gssize, respectively.
 100  *
 101  * Likewise, to get the result of an asynchronous function,
 102  * g_simple_async_result_get_op_res_gpointer(),
 103  * g_simple_async_result_get_op_res_gboolean(), and
 104  * g_simple_async_result_get_op_res_gssize() are
 105  * provided, getting the operation's result as a gpointer, gboolean, and
 106  * gssize, respectively.
 107  **/
 108
 109 static void g_simple_async_result_async_result_iface_init (GAsyncResultIface       *iface);
 110
 111 struct _GSimpleAsyncResult
 112 {
 113   GObject parent_instance;
 114
 115   GObject *source_object;
 116   GAsyncReadyCallback callback;
 117   gpointer user_data;
 118   GError *error;
 119   gboolean failed;
 120   gboolean handle_cancellation;
 121
 122   gpointer source_tag;
 123
 124   union {
 125     gpointer v_pointer;
 126     gboolean v_boolean;
 127     gssize   v_ssize;
 128   } op_res;
 129
 130   GDestroyNotify destroy_op_res;
 131 };
 132
 133 struct _GSimpleAsyncResultClass
 134 {
 135   GObjectClass parent_class;
 136 };
 137
 138
 139 G_DEFINE_TYPE_WITH_CODE (GSimpleAsyncResult, g_simple_async_result, G_TYPE_OBJECT,
 140                          G_IMPLEMENT_INTERFACE (G_TYPE_ASYNC_RESULT,
 141                                                 g_simple_async_result_async_result_iface_init))
 142
 143 static void
 144 g_simple_async_result_finalize (GObject *object)
 145 {
 146   GSimpleAsyncResult *simple;
 147
 148   simple = G_SIMPLE_ASYNC_RESULT (object);
 149
 150   if (simple->source_object)
 151     g_object_unref (simple->source_object);
 152
 153   if (simple->destroy_op_res)
 154     simple->destroy_op_res (simple->op_res.v_pointer);
 155
 156   if (simple->error)
 157     g_error_free (simple->error);
 158
 159   if (G_OBJECT_CLASS (g_simple_async_result_parent_class)->finalize)
 160     (*G_OBJECT_CLASS (g_simple_async_result_parent_class)->finalize) (object);
 161 }
 162
 163 static void
 164 g_simple_async_result_class_init (GSimpleAsyncResultClass *klass)
 165 {
 166   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 167
 168   gobject_class->finalize = g_simple_async_result_finalize;
 169 }
 170
 171 static void
 172 g_simple_async_result_init (GSimpleAsyncResult *simple)
 173 {
 174   simple->handle_cancellation = TRUE;
 175 }
 176
 177 /**
 178  * g_simple_async_result_new:
 179  * @source_object: a #GObject the asynchronous function was called with.
 180  * @callback: a #GAsyncReadyCallback.
 181  * @user_data: user data passed to @callback.
 182  * @source_tag: the asynchronous function.
 183  *
 184  * Creates a #GSimpleAsyncResult.
 185  *
 186  * Returns: a #GSimpleAsyncResult.
 187  **/
 188 GSimpleAsyncResult *
 189 g_simple_async_result_new (GObject             *source_object,
 190                            GAsyncReadyCallback  callback,
 191                            gpointer             user_data,
 192                            gpointer             source_tag)
 193 {
 194   GSimpleAsyncResult *simple;
 195
 196   g_return_val_if_fail (G_IS_OBJECT (source_object), NULL);
 197
 198   simple = g_object_new (G_TYPE_SIMPLE_ASYNC_RESULT, NULL);
 199   simple->callback = callback;
 200   simple->source_object = g_object_ref (source_object);
 201   simple->user_data = user_data;
 202   simple->source_tag = source_tag;
 203
 204   return simple;
 205 }
 206
 207 /**
 208  * g_simple_async_result_new_from_error:
 209  * @source_object: a #GObject.
 210  * @callback: a #GAsyncReadyCallback.
 211  * @user_data: user data passed to @callback.
 212  * @error: a #GError location.
 213  *
 214  * Creates a #GSimpleAsyncResult from an error condition.
 215  *
 216  * Returns: a #GSimpleAsyncResult.
 217  **/
 218 GSimpleAsyncResult *
 219 g_simple_async_result_new_from_error (GObject             *source_object,
 220                                       GAsyncReadyCallback  callback,
 221                                       gpointer             user_data,
 222                                       GError              *error)
 223 {
 224   GSimpleAsyncResult *simple;
 225
 226   g_return_val_if_fail (G_IS_OBJECT (source_object), NULL);
 227
 228   simple = g_simple_async_result_new (source_object,
 229                                       callback,
 230                                       user_data, NULL);
 231   g_simple_async_result_set_from_error (simple, error);
 232
 233   return simple;
 234 }
 235
 236 /**
 237  * g_simple_async_result_new_error:
 238  * @source_object: a #GObject.
 239  * @callback: a #GAsyncReadyCallback.
 240  * @user_data: user data passed to @callback.
 241  * @domain: a #GQuark.
 242  * @code: an error code.
 243  * @format: a string with format characters.
 244  * @...: a list of values to insert into @format.
 245  *
 246  * Creates a new #GSimpleAsyncResult with a set error.
 247  *
 248  * Returns: a #GSimpleAsyncResult.
 249  **/
 250 GSimpleAsyncResult *
 251 g_simple_async_result_new_error (GObject             *source_object,
 252                                  GAsyncReadyCallback  callback,
 253                                  gpointer             user_data,
 254                                  GQuark               domain,
 255                                  gint                 code,
 256                                  const char          *format,
 257                                  ...)
 258 {
 259   GSimpleAsyncResult *simple;
 260   va_list args;
 261
 262   g_return_val_if_fail (G_IS_OBJECT (source_object), NULL);
 263   g_return_val_if_fail (domain != 0, NULL);
 264   g_return_val_if_fail (format != NULL, NULL);
 265
 266   simple = g_simple_async_result_new (source_object,
 267                                       callback,
 268                                       user_data, NULL);
 269
 270   va_start (args, format);
 271   g_simple_async_result_set_error_va (simple, domain, code, format, args);
 272   va_end (args);
 273
 274   return simple;
 275 }
 276
 277
 278 static gpointer
 279 g_simple_async_result_get_user_data (GAsyncResult *res)
 280 {
 281   return G_SIMPLE_ASYNC_RESULT (res)->user_data;
 282 }
 283
 284 static GObject *
 285 g_simple_async_result_get_source_object (GAsyncResult *res)
 286 {
 287   if (G_SIMPLE_ASYNC_RESULT (res)->source_object)
 288     return g_object_ref (G_SIMPLE_ASYNC_RESULT (res)->source_object);
 289   return NULL;
 290 }
 291
 292 static void
 293 g_simple_async_result_async_result_iface_init (GAsyncResultIface *iface)
 294 {
 295   iface->get_user_data = g_simple_async_result_get_user_data;
 296   iface->get_source_object = g_simple_async_result_get_source_object;
 297 }
 298
 299 /**
 300  * g_simple_async_result_set_handle_cancellation:
 301  * @simple: a #GSimpleAsyncResult.
 302  * @handle_cancellation: a #gboolean.
 303  *
 304  * Sets whether to handle cancellation within the asynchronous operation.
 305  *
 306  **/
 307 void
 308 g_simple_async_result_set_handle_cancellation (GSimpleAsyncResult *simple,
 309                                                gboolean            handle_cancellation)
 310 {
 311   g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
 312   simple->handle_cancellation = handle_cancellation;
 313 }
 314
 315 /**
 316  * g_simple_async_result_get_source_tag:
 317  * @simple: a #GSimpleAsyncResult.
 318  *
 319  * Gets the source tag for the #GSimpleAsyncResult.
 320  *
 321  * Returns: a #gpointer to the source object for the #GSimpleAsyncResult.
 322  **/
 323 gpointer
 324 g_simple_async_result_get_source_tag (GSimpleAsyncResult *simple)
 325 {
 326   g_return_val_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple), NULL);
 327   return simple->source_tag;
 328 }
 329
 330 /**
 331  * g_simple_async_result_propagate_error:
 332  * @simple: a #GSimpleAsyncResult.
 333  * @dest: a location to propegate the error to.
 334  *
 335  * Propagates an error from within the simple asynchronous result to
 336  * a given destination.
 337  *
 338  * Returns: %TRUE if the error was propegated to @dest. %FALSE otherwise.
 339  **/
 340 gboolean
 341 g_simple_async_result_propagate_error (GSimpleAsyncResult  *simple,
 342                                        GError             **dest)
 343 {
 344   g_return_val_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple), FALSE);
 345
 346   if (simple->failed)
 347     {
 348       g_propagate_error (dest, simple->error);
 349       simple->error = NULL;
 350       return TRUE;
 351     }
 352
 353   return FALSE;
 354 }
 355
 356 /**
 357  * g_simple_async_result_set_op_res_gpointer:
 358  * @simple: a #GSimpleAsyncResult.
 359  * @op_res: a pointer result from an asynchronous function.
 360  * @destroy_op_res: a #GDestroyNotify function.
 361  *
 362  * Sets the operation result within the asynchronous result to a pointer.
 363  **/
 364 void
 365 g_simple_async_result_set_op_res_gpointer (GSimpleAsyncResult *simple,
 366                                            gpointer            op_res,
 367                                            GDestroyNotify      destroy_op_res)
 368 {
 369   g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
 370
 371   simple->op_res.v_pointer = op_res;
 372   simple->destroy_op_res = destroy_op_res;
 373 }
 374
 375 /**
 376  * g_simple_async_result_get_op_res_gpointer:
 377  * @simple: a #GSimpleAsyncResult.
 378  *
 379  * Gets a pointer result as returned by the asynchronous function.
 380  *
 381  * Returns: a pointer from the result.
 382  **/
 383 gpointer
 384 g_simple_async_result_get_op_res_gpointer (GSimpleAsyncResult *simple)
 385 {
 386   g_return_val_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple), NULL);
 387   return simple->op_res.v_pointer;
 388 }
 389
 390 /**
 391  * g_simple_async_result_set_op_res_gssize:
 392  * @simple: a #GSimpleAsyncResult.
 393  * @op_res: a #gssize.
 394  *
 395  * Sets the operation result within the asynchronous result to
 396  * the given @op_res.
 397  **/
 398 void
 399 g_simple_async_result_set_op_res_gssize (GSimpleAsyncResult *simple,
 400                                          gssize              op_res)
 401 {
 402   g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
 403   simple->op_res.v_ssize = op_res;
 404 }
 405
 406 /**
 407  * g_simple_async_result_get_op_res_gssize:
 408  * @simple: a #GSimpleAsyncResult.
 409  *
 410  * Gets a gssize from the asynchronous result.
 411  *
 412  * Returns: a gssize returned from the asynchronous function.
 413  **/
 414 gssize
 415 g_simple_async_result_get_op_res_gssize (GSimpleAsyncResult *simple)
 416 {
 417   g_return_val_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple), 0);
 418   return simple->op_res.v_ssize;
 419 }
 420
 421 /**
 422  * g_simple_async_result_set_op_res_gboolean:
 423  * @simple: a #GSimpleAsyncResult.
 424  * @op_res: a #gboolean.
 425  *
 426  * Sets the operation result to a boolean within the asynchronous result.
 427  **/
 428 void
 429 g_simple_async_result_set_op_res_gboolean (GSimpleAsyncResult *simple,
 430                                            gboolean            op_res)
 431 {
 432   g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
 433   simple->op_res.v_boolean = !!op_res;
 434 }
 435
 436 /**
 437  * g_simple_async_result_get_op_res_gboolean:
 438  * @simple: a #GSimpleAsyncResult.
 439  *
 440  * Gets the operation result boolean from within the asynchronous result.
 441  *
 442  * Returns: %TRUE if the operation's result was %TRUE, %FALSE
 443  *     if the operation's result was %FALSE.
 444  **/
 445 gboolean
 446 g_simple_async_result_get_op_res_gboolean (GSimpleAsyncResult *simple)
 447 {
 448   g_return_val_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple), FALSE);
 449   return simple->op_res.v_boolean;
 450 }
 451
 452 /**
 453  * g_simple_async_result_set_from_error:
 454  * @simple: a #GSimpleAsyncResult.
 455  * @error: #GError.
 456  *
 457  * Sets the result from a #GError.
 458  **/
 459 void
 460 g_simple_async_result_set_from_error (GSimpleAsyncResult *simple,
 461                                       GError             *error)
 462 {
 463   g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
 464   g_return_if_fail (error != NULL);
 465
 466   simple->error = g_error_copy (error);
 467   simple->failed = TRUE;
 468 }
 469
 470 static GError*
 471 _g_error_new_valist (GQuark     domain,
 472                     gint        code,
 473                     const char *format,
 474                     va_list     args)
 475 {
 476   GError *error;
 477   char *message;
 478
 479   message = g_strdup_vprintf (format, args);
 480
 481   error = g_error_new_literal (domain, code, message);
 482   g_free (message);
 483
 484   return error;
 485 }
 486
 487 /**
 488  * g_simple_async_result_set_error_va:
 489  * @simple: a #GSimpleAsyncResult.
 490  * @domain: a #GQuark (usually #G_IO_ERROR).
 491  * @code: an error code.
 492  * @format: a formatted error reporting string.
 493  * @args: va_list of arguments.
 494  *
 495  * Sets an error within the asynchronous result without a #GError.
 496  * Unless writing a binding, see g_simple_async_result_set_error().
 497  **/
 498 void
 499 g_simple_async_result_set_error_va (GSimpleAsyncResult *simple,
 500                                     GQuark              domain,
 501                                     gint                code,
 502                                     const char         *format,
 503                                     va_list             args)
 504 {
 505   g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
 506   g_return_if_fail (domain != 0);
 507   g_return_if_fail (format != NULL);
 508
 509   simple->error = _g_error_new_valist (domain, code, format, args);
 510   simple->failed = TRUE;
 511 }
 512
 513 /**
 514  * g_simple_async_result_set_error:
 515  * @simple: a #GSimpleAsyncResult.
 516  * @domain: a #GQuark (usually #G_IO_ERROR).
 517  * @code: an error code.
 518  * @format: a formatted error reporting string.
 519  * @...: a list of variables to fill in @format.
 520  *
 521  * Sets an error within the asynchronous result without a #GError.
 522  **/
 523 void
 524 g_simple_async_result_set_error (GSimpleAsyncResult *simple,
 525                                  GQuark              domain,
 526                                  gint                code,
 527                                  const char         *format,
 528                                  ...)
 529 {
 530   va_list args;
 531
 532   g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
 533   g_return_if_fail (domain != 0);
 534   g_return_if_fail (format != NULL);
 535
 536   va_start (args, format);
 537   g_simple_async_result_set_error_va (simple, domain, code, format, args);
 538   va_end (args);
 539 }
 540
 541 /**
 542  * g_simple_async_result_complete:
 543  * @simple: a #GSimpleAsyncResult.
 544  *
 545  * Completes an asynchronous I/O job.
 546  **/
 547 void
 548 g_simple_async_result_complete (GSimpleAsyncResult *simple)
 549 {
 550   g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
 551
 552   if (simple->callback)
 553     simple->callback (simple->source_object,
 554                       G_ASYNC_RESULT (simple),
 555                       simple->user_data);
 556 }
 557
 558 static gboolean
 559 complete_in_idle_cb (gpointer data)
 560 {
 561   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (data);
 562
 563   g_simple_async_result_complete (simple);
 564
 565   return FALSE;
 566 }
 567
 568 /**
 569  * g_simple_async_result_complete_in_idle:
 570  * @simple: a #GSimpleAsyncResult.
 571  *
 572  * Completes an asynchronous function in the main event loop using
 573  * an idle function.
 574  **/
 575 void
 576 g_simple_async_result_complete_in_idle (GSimpleAsyncResult *simple)
 577 {
 578   GSource *source;
 579   guint id;
 580
 581   g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
 582
 583   g_object_ref (simple);
 584
 585   source = g_idle_source_new ();
 586   g_source_set_priority (source, G_PRIORITY_DEFAULT);
 587   g_source_set_callback (source, complete_in_idle_cb, simple, g_object_unref);
 588
 589   id = g_source_attach (source, NULL);
 590   g_source_unref (source);
 591 }
 592
 593 typedef struct {
 594   GSimpleAsyncResult *simple;
 595   GSimpleAsyncThreadFunc func;
 596 } RunInThreadData;
 597
 598 static gboolean
 599 run_in_thread (GIOSchedulerJob *job,
 600                GCancellable    *c,
 601                gpointer         _data)
 602 {
 603   RunInThreadData *data = _data;
 604   GSimpleAsyncResult *simple = data->simple;
 605
 606   if (simple->handle_cancellation &&
 607       g_cancellable_is_cancelled (c))
 608     g_simple_async_result_set_error (simple,
 609                                      G_IO_ERROR,
 610                                      G_IO_ERROR_CANCELLED,
 611                                      _("Operation was cancelled"));
 612   else
 613     data->func (simple,
 614                 simple->source_object,
 615                 c);
 616
 617   g_simple_async_result_complete_in_idle (data->simple);
 618   g_object_unref (data->simple);
 619   g_free (data);
 620
 621   return FALSE;
 622 }
 623
 624 /**
 625  * g_simple_async_result_run_in_thread:
 626  * @simple: a #GSimpleAsyncResult.
 627  * @func: a #GSimpleAsyncThreadFunc.
 628  * @io_priority: the io priority of the request.
 629  * @cancellable: optional #GCancellable object, %NULL to ignore.
 630  *
 631  * Runs the asynchronous job in a separated thread.
 632  **/
 633 void
 634 g_simple_async_result_run_in_thread (GSimpleAsyncResult     *simple,
 635                                      GSimpleAsyncThreadFunc  func,
 636                                      int                     io_priority,
 637                                      GCancellable           *cancellable)
 638 {
 639   RunInThreadData *data;
 640
 641   g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
 642   g_return_if_fail (func != NULL);
 643
 644   data = g_new (RunInThreadData, 1);
 645   data->func = func;
 646   data->simple = g_object_ref (simple);
 647   g_io_scheduler_push_job (run_in_thread, data, NULL, io_priority, cancellable);
 648 }
 649
 650 /**
 651  * g_simple_async_report_error_in_idle:
 652  * @object: a #GObject.
 653  * @callback: a #GAsyncReadyCallback.
 654  * @user_data: user data passed to @callback.
 655  * @domain: a #GQuark containing the error domain (usually #G_IO_ERROR).
 656  * @code: a specific error code.
 657  * @format: a formatted error reporting string.
 658  * @...: a list of variables to fill in @format.
 659  *
 660  * Reports an error in an asynchronous function in an idle function by
 661  * directly setting the contents of the #GAsyncResult with the given error
 662  * information.
 663  **/
 664 void
 665 g_simple_async_report_error_in_idle (GObject             *object,
 666                                      GAsyncReadyCallback  callback,
 667                                      gpointer             user_data,
 668                                      GQuark               domain,
 669                                      gint                 code,
 670                                      const char          *format,
 671                                      ...)
 672 {
 673   GSimpleAsyncResult *simple;
 674   va_list args;
 675
 676   g_return_if_fail (G_IS_OBJECT (object));
 677   g_return_if_fail (domain != 0);
 678   g_return_if_fail (format != NULL);
 679
 680   simple = g_simple_async_result_new (object,
 681                                       callback,
 682                                       user_data, NULL);
 683
 684   va_start (args, format);
 685   g_simple_async_result_set_error_va (simple, domain, code, format, args);
 686   va_end (args);
 687   g_simple_async_result_complete_in_idle (simple);
 688   g_object_unref (simple);
 689 }
 690
 691 /**
 692  * g_simple_async_report_gerror_in_idle:
 693  * @object: a #GObject.
 694  * @callback: a #GAsyncReadyCallback.
 695  * @user_data: user data passed to @callback.
 696  * @error: the #GError to report
 697  *
 698  * Reports an error in an idle function. Similar to
 699  * g_simple_async_report_error_in_idle(), but takes a #GError rather
 700  * than building a new one.
 701  **/
 702 void
 703 g_simple_async_report_gerror_in_idle (GObject *object,
 704                                       GAsyncReadyCallback callback,
 705                                       gpointer user_data,
 706                                       GError *error)
 707 {
 708   GSimpleAsyncResult *simple;
 709
 710   g_return_if_fail (G_IS_OBJECT (object));
 711   g_return_if_fail (error != NULL);
 712
 713   simple = g_simple_async_result_new_from_error (object,
 714                                                  callback,
 715                                                  user_data,
 716                                                  error);
 717   g_simple_async_result_complete_in_idle (simple);
 718   g_object_unref (simple);
 719 }
 720
 721 #define __G_SIMPLE_ASYNC_RESULT_C__
 722 #include "gioaliasdef.c"