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glib/gio/gsimpleasyncresult.c

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/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2006-2007 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* 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, see <http://www.gnu.org/licenses/>.
*
* Author: Alexander Larsson <alexl@redhat.com>
*/
#include "config.h"
#include <string.h>
#include "gsimpleasyncresult.h"
#include "gasyncresult.h"
#include "gcancellable.h"
#include "gioscheduler.h"
#include <gio/gioerror.h>
#include "glibintl.h"
/**
* SECTION:gsimpleasyncresult
* @short_description: Simple asynchronous results implementation
* @include: gio/gio.h
* @see_also: #GAsyncResult, #GTask
*
* As of GLib 2.46, #GSimpleAsyncResult is deprecated in favor of
* #GTask, which provides a simpler API.
*
* #GSimpleAsyncResult implements #GAsyncResult.
*
* GSimpleAsyncResult handles #GAsyncReadyCallbacks, error
* reporting, operation cancellation and the final state of an operation,
* completely transparent to the application. Results can be returned
* as a pointer e.g. for functions that return data that is collected
* asynchronously, a boolean value for checking the success or failure
* of an operation, or a #gssize for operations which return the number
* of bytes modified by the operation; all of the simple return cases
* are covered.
*
* Most of the time, an application will not need to know of the details
* of this API; it is handled transparently, and any necessary operations
* are handled by #GAsyncResult's interface. However, if implementing a
* new GIO module, for writing language bindings, or for complex
* applications that need better control of how asynchronous operations
* are completed, it is important to understand this functionality.
*
* GSimpleAsyncResults are tagged with the calling function to ensure
* that asynchronous functions and their finishing functions are used
* together correctly.
*
* To create a new #GSimpleAsyncResult, call g_simple_async_result_new().
* If the result needs to be created for a #GError, use
* g_simple_async_result_new_from_error() or
* g_simple_async_result_new_take_error(). If a #GError is not available
* (e.g. the asynchronous operation's doesn't take a #GError argument),
* but the result still needs to be created for an error condition, use
* g_simple_async_result_new_error() (or g_simple_async_result_set_error_va()
* if your application or binding requires passing a variable argument list
* directly), and the error can then be propagated through the use of
* g_simple_async_result_propagate_error().
*
* An asynchronous operation can be made to ignore a cancellation event by
* calling g_simple_async_result_set_handle_cancellation() with a
* #GSimpleAsyncResult for the operation and %FALSE. This is useful for
* operations that are dangerous to cancel, such as close (which would
* cause a leak if cancelled before being run).
*
* GSimpleAsyncResult can integrate into GLib's event loop, #GMainLoop,
* or it can use #GThreads.
* g_simple_async_result_complete() will finish an I/O task directly
* from the point where it is called. g_simple_async_result_complete_in_idle()
* will finish it from an idle handler in the
* [thread-default main context][g-main-context-push-thread-default]
* where the #GSimpleAsyncResult was created.
* g_simple_async_result_run_in_thread() will run the job in a
* separate thread and then use
* g_simple_async_result_complete_in_idle() to deliver the result.
*
* To set the results of an asynchronous function,
* g_simple_async_result_set_op_res_gpointer(),
* g_simple_async_result_set_op_res_gboolean(), and
* g_simple_async_result_set_op_res_gssize()
* are provided, setting the operation's result to a gpointer, gboolean, or
* gssize, respectively.
*
* Likewise, to get the result of an asynchronous function,
* g_simple_async_result_get_op_res_gpointer(),
* g_simple_async_result_get_op_res_gboolean(), and
* g_simple_async_result_get_op_res_gssize() are
* provided, getting the operation's result as a gpointer, gboolean, and
* gssize, respectively.
*
* For the details of the requirements implementations must respect, see
* #GAsyncResult. A typical implementation of an asynchronous operation
* using GSimpleAsyncResult looks something like this:
*
* |[<!-- language="C" -->
* static void
* baked_cb (Cake *cake,
* gpointer user_data)
* {
* // In this example, this callback is not given a reference to the cake,
* // so the GSimpleAsyncResult has to take a reference to it.
* GSimpleAsyncResult *result = user_data;
*
* if (cake == NULL)
* g_simple_async_result_set_error (result,
* BAKER_ERRORS,
* BAKER_ERROR_NO_FLOUR,
* "Go to the supermarket");
* else
* g_simple_async_result_set_op_res_gpointer (result,
* g_object_ref (cake),
* g_object_unref);
*
*
* // In this example, we assume that baked_cb is called as a callback from
* // the mainloop, so it's safe to complete the operation synchronously here.
* // If, however, _baker_prepare_cake () might call its callback without
* // first returning to the mainloop — inadvisable, but some APIs do so —
* // we would need to use g_simple_async_result_complete_in_idle().
* g_simple_async_result_complete (result);
* g_object_unref (result);
* }
*
* void
* baker_bake_cake_async (Baker *self,
* guint radius,
* GAsyncReadyCallback callback,
* gpointer user_data)
* {
* GSimpleAsyncResult *simple;
* Cake *cake;
*
* if (radius < 3)
* {
* g_simple_async_report_error_in_idle (G_OBJECT (self),
* callback,
* user_data,
* BAKER_ERRORS,
* BAKER_ERROR_TOO_SMALL,
* "%ucm radius cakes are silly",
* radius);
* return;
* }
*
* simple = g_simple_async_result_new (G_OBJECT (self),
* callback,
* user_data,
* baker_bake_cake_async);
* cake = _baker_get_cached_cake (self, radius);
*
* if (cake != NULL)
* {
* g_simple_async_result_set_op_res_gpointer (simple,
* g_object_ref (cake),
* g_object_unref);
* g_simple_async_result_complete_in_idle (simple);
* g_object_unref (simple);
* // Drop the reference returned by _baker_get_cached_cake();
* // the GSimpleAsyncResult has taken its own reference.
* g_object_unref (cake);
* return;
* }
*
* _baker_prepare_cake (self, radius, baked_cb, simple);
* }
*
* Cake *
* baker_bake_cake_finish (Baker *self,
* GAsyncResult *result,
* GError **error)
* {
* GSimpleAsyncResult *simple;
* Cake *cake;
*
* g_return_val_if_fail (g_simple_async_result_is_valid (result,
* G_OBJECT (self),
* baker_bake_cake_async),
* NULL);
*
* simple = (GSimpleAsyncResult *) result;
*
* if (g_simple_async_result_propagate_error (simple, error))
* return NULL;
*
* cake = CAKE (g_simple_async_result_get_op_res_gpointer (simple));
* return g_object_ref (cake);
* }
* ]|
*/
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
static void g_simple_async_result_async_result_iface_init (GAsyncResultIface *iface);
struct _GSimpleAsyncResult
{
GObject parent_instance;
GObject *source_object;
GAsyncReadyCallback callback;
gpointer user_data;
GMainContext *context;
GError *error;
gboolean failed;
gboolean handle_cancellation;
GCancellable *check_cancellable;
gpointer source_tag;
union {
gpointer v_pointer;
gboolean v_boolean;
gssize v_ssize;
} op_res;
GDestroyNotify destroy_op_res;
};
struct _GSimpleAsyncResultClass
{
GObjectClass parent_class;
};
G_DEFINE_TYPE_WITH_CODE (GSimpleAsyncResult, g_simple_async_result, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (G_TYPE_ASYNC_RESULT,
g_simple_async_result_async_result_iface_init))
static void
clear_op_res (GSimpleAsyncResult *simple)
{
if (simple->destroy_op_res)
simple->destroy_op_res (simple->op_res.v_pointer);
simple->destroy_op_res = NULL;
simple->op_res.v_ssize = 0;
}
static void
g_simple_async_result_finalize (GObject *object)
{
GSimpleAsyncResult *simple;
simple = G_SIMPLE_ASYNC_RESULT (object);
if (simple->source_object)
g_object_unref (simple->source_object);
if (simple->check_cancellable)
g_object_unref (simple->check_cancellable);
g_main_context_unref (simple->context);
clear_op_res (simple);
if (simple->error)
g_error_free (simple->error);
G_OBJECT_CLASS (g_simple_async_result_parent_class)->finalize (object);
}
static void
g_simple_async_result_class_init (GSimpleAsyncResultClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = g_simple_async_result_finalize;
}
static void
g_simple_async_result_init (GSimpleAsyncResult *simple)
{
simple->handle_cancellation = TRUE;
simple->context = g_main_context_ref_thread_default ();
}
/**
* g_simple_async_result_new:
* @source_object: (nullable): a #GObject, or %NULL.
* @callback: (scope async): a #GAsyncReadyCallback.
* @user_data: (closure): user data passed to @callback.
* @source_tag: the asynchronous function.
*
* Creates a #GSimpleAsyncResult.
*
* The common convention is to create the #GSimpleAsyncResult in the
* function that starts the asynchronous operation and use that same
* function as the @source_tag.
*
* If your operation supports cancellation with #GCancellable (which it
* probably should) then you should provide the user's cancellable to
* g_simple_async_result_set_check_cancellable() immediately after
* this function returns.
*
* Returns: a #GSimpleAsyncResult.
*
* Deprecated: 2.46: Use g_task_new() instead.
**/
GSimpleAsyncResult *
g_simple_async_result_new (GObject *source_object,
GAsyncReadyCallback callback,
gpointer user_data,
gpointer source_tag)
{
GSimpleAsyncResult *simple;
g_return_val_if_fail (!source_object || G_IS_OBJECT (source_object), NULL);
simple = g_object_new (G_TYPE_SIMPLE_ASYNC_RESULT, NULL);
simple->callback = callback;
if (source_object)
simple->source_object = g_object_ref (source_object);
else
simple->source_object = NULL;
simple->user_data = user_data;
simple->source_tag = source_tag;
return simple;
}
/**
* g_simple_async_result_new_from_error:
* @source_object: (nullable): a #GObject, or %NULL.
* @callback: (scope async): a #GAsyncReadyCallback.
* @user_data: (closure): user data passed to @callback.
* @error: a #GError
*
* Creates a #GSimpleAsyncResult from an error condition.
*
* Returns: a #GSimpleAsyncResult.
*
* Deprecated: 2.46: Use g_task_new() and g_task_return_error() instead.
**/
GSimpleAsyncResult *
g_simple_async_result_new_from_error (GObject *source_object,
GAsyncReadyCallback callback,
gpointer user_data,
const GError *error)
{
GSimpleAsyncResult *simple;
g_return_val_if_fail (!source_object || G_IS_OBJECT (source_object), NULL);
simple = g_simple_async_result_new (source_object,
callback,
user_data, NULL);
g_simple_async_result_set_from_error (simple, error);
return simple;
}
/**
* g_simple_async_result_new_take_error: (skip)
* @source_object: (nullable): a #GObject, or %NULL
* @callback: (scope async): a #GAsyncReadyCallback
* @user_data: (closure): user data passed to @callback
* @error: a #GError
*
* Creates a #GSimpleAsyncResult from an error condition, and takes over the
* caller's ownership of @error, so the caller does not need to free it anymore.
*
* Returns: a #GSimpleAsyncResult
*
* Since: 2.28
*
* Deprecated: 2.46: Use g_task_new() and g_task_return_error() instead.
**/
GSimpleAsyncResult *
g_simple_async_result_new_take_error (GObject *source_object,
GAsyncReadyCallback callback,
gpointer user_data,
GError *error)
{
GSimpleAsyncResult *simple;
g_return_val_if_fail (!source_object || G_IS_OBJECT (source_object), NULL);
simple = g_simple_async_result_new (source_object,
callback,
user_data, NULL);
g_simple_async_result_take_error (simple, error);
return simple;
}
/**
* g_simple_async_result_new_error:
* @source_object: (nullable): a #GObject, or %NULL.
* @callback: (scope async): a #GAsyncReadyCallback.
* @user_data: (closure): user data passed to @callback.
* @domain: a #GQuark.
* @code: an error code.
* @format: a string with format characters.
* @...: a list of values to insert into @format.
*
* Creates a new #GSimpleAsyncResult with a set error.
*
* Returns: a #GSimpleAsyncResult.
*
* Deprecated: 2.46: Use g_task_new() and g_task_return_new_error() instead.
**/
GSimpleAsyncResult *
g_simple_async_result_new_error (GObject *source_object,
GAsyncReadyCallback callback,
gpointer user_data,
GQuark domain,
gint code,
const char *format,
...)
{
GSimpleAsyncResult *simple;
va_list args;
g_return_val_if_fail (!source_object || G_IS_OBJECT (source_object), NULL);
g_return_val_if_fail (domain != 0, NULL);
g_return_val_if_fail (format != NULL, NULL);
simple = g_simple_async_result_new (source_object,
callback,
user_data, NULL);
va_start (args, format);
g_simple_async_result_set_error_va (simple, domain, code, format, args);
va_end (args);
return simple;
}
static gpointer
g_simple_async_result_get_user_data (GAsyncResult *res)
{
return G_SIMPLE_ASYNC_RESULT (res)->user_data;
}
static GObject *
g_simple_async_result_get_source_object (GAsyncResult *res)
{
if (G_SIMPLE_ASYNC_RESULT (res)->source_object)
return g_object_ref (G_SIMPLE_ASYNC_RESULT (res)->source_object);
return NULL;
}
static gboolean
g_simple_async_result_is_tagged (GAsyncResult *res,
gpointer source_tag)
{
return G_SIMPLE_ASYNC_RESULT (res)->source_tag == source_tag;
}
static void
g_simple_async_result_async_result_iface_init (GAsyncResultIface *iface)
{
iface->get_user_data = g_simple_async_result_get_user_data;
iface->get_source_object = g_simple_async_result_get_source_object;
iface->is_tagged = g_simple_async_result_is_tagged;
}
/**
* g_simple_async_result_set_handle_cancellation:
* @simple: a #GSimpleAsyncResult.
* @handle_cancellation: a #gboolean.
*
* Sets whether to handle cancellation within the asynchronous operation.
*
* This function has nothing to do with
* g_simple_async_result_set_check_cancellable(). It only refers to the
* #GCancellable passed to g_simple_async_result_run_in_thread().
*
* Deprecated: 2.46
**/
void
g_simple_async_result_set_handle_cancellation (GSimpleAsyncResult *simple,
gboolean handle_cancellation)
{
g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
simple->handle_cancellation = handle_cancellation;
}
/**
* g_simple_async_result_get_source_tag: (skip)
* @simple: a #GSimpleAsyncResult.
*
* Gets the source tag for the #GSimpleAsyncResult.
*
* Returns: a #gpointer to the source object for the #GSimpleAsyncResult.
*
* Deprecated: 2.46. Use #GTask and g_task_get_source_tag() instead.
**/
gpointer
g_simple_async_result_get_source_tag (GSimpleAsyncResult *simple)
{
g_return_val_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple), NULL);
return simple->source_tag;
}
/**
* g_simple_async_result_propagate_error:
* @simple: a #GSimpleAsyncResult.
* @dest: (out): a location to propagate the error to.
*
* Propagates an error from within the simple asynchronous result to
* a given destination.
*
* If the #GCancellable given to a prior call to
* g_simple_async_result_set_check_cancellable() is cancelled then this
* function will return %TRUE with @dest set appropriately.
*
* Returns: %TRUE if the error was propagated to @dest. %FALSE otherwise.
*
* Deprecated: 2.46: Use #GTask instead.
**/
gboolean
g_simple_async_result_propagate_error (GSimpleAsyncResult *simple,
GError **dest)
{
g_return_val_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple), FALSE);
if (g_cancellable_set_error_if_cancelled (simple->check_cancellable, dest))
return TRUE;
if (simple->failed)
{
g_propagate_error (dest, simple->error);
simple->error = NULL;
return TRUE;
}
return FALSE;
}
/**
* g_simple_async_result_set_op_res_gpointer: (skip)
* @simple: a #GSimpleAsyncResult.
* @op_res: a pointer result from an asynchronous function.
* @destroy_op_res: a #GDestroyNotify function.
*
* Sets the operation result within the asynchronous result to a pointer.
*
* Deprecated: 2.46: Use #GTask and g_task_return_pointer() instead.
**/
void
g_simple_async_result_set_op_res_gpointer (GSimpleAsyncResult *simple,
gpointer op_res,
GDestroyNotify destroy_op_res)
{
g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
clear_op_res (simple);
simple->op_res.v_pointer = op_res;
simple->destroy_op_res = destroy_op_res;
}
/**
* g_simple_async_result_get_op_res_gpointer: (skip)
* @simple: a #GSimpleAsyncResult.
*
* Gets a pointer result as returned by the asynchronous function.
*
* Returns: a pointer from the result.
*
* Deprecated: 2.46: Use #GTask and g_task_propagate_pointer() instead.
**/
gpointer
g_simple_async_result_get_op_res_gpointer (GSimpleAsyncResult *simple)
{
g_return_val_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple), NULL);
return simple->op_res.v_pointer;
}
/**
* g_simple_async_result_set_op_res_gssize:
* @simple: a #GSimpleAsyncResult.
* @op_res: a #gssize.
*
* Sets the operation result within the asynchronous result to
* the given @op_res.
*
* Deprecated: 2.46: Use #GTask and g_task_return_int() instead.
**/
void
g_simple_async_result_set_op_res_gssize (GSimpleAsyncResult *simple,
gssize op_res)
{
g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
clear_op_res (simple);
simple->op_res.v_ssize = op_res;
}
/**
* g_simple_async_result_get_op_res_gssize:
* @simple: a #GSimpleAsyncResult.
*
* Gets a gssize from the asynchronous result.
*
* Returns: a gssize returned from the asynchronous function.
*
* Deprecated: 2.46: Use #GTask and g_task_propagate_int() instead.
**/
gssize
g_simple_async_result_get_op_res_gssize (GSimpleAsyncResult *simple)
{
g_return_val_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple), 0);
return simple->op_res.v_ssize;
}
/**
* g_simple_async_result_set_op_res_gboolean:
* @simple: a #GSimpleAsyncResult.
* @op_res: a #gboolean.
*
* Sets the operation result to a boolean within the asynchronous result.
*
* Deprecated: 2.46: Use #GTask and g_task_return_boolean() instead.
**/
void
g_simple_async_result_set_op_res_gboolean (GSimpleAsyncResult *simple,
gboolean op_res)
{
g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
clear_op_res (simple);
simple->op_res.v_boolean = !!op_res;
}
/**
* g_simple_async_result_get_op_res_gboolean:
* @simple: a #GSimpleAsyncResult.
*
* Gets the operation result boolean from within the asynchronous result.
*
* Returns: %TRUE if the operation's result was %TRUE, %FALSE
* if the operation's result was %FALSE.
*
* Deprecated: 2.46: Use #GTask and g_task_propagate_boolean() instead.
**/
gboolean
g_simple_async_result_get_op_res_gboolean (GSimpleAsyncResult *simple)
{
g_return_val_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple), FALSE);
return simple->op_res.v_boolean;
}
/**
* g_simple_async_result_set_from_error:
* @simple: a #GSimpleAsyncResult.
* @error: #GError.
*
* Sets the result from a #GError.
*
* Deprecated: 2.46: Use #GTask and g_task_return_error() instead.
**/
void
g_simple_async_result_set_from_error (GSimpleAsyncResult *simple,
const GError *error)
{
g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
g_return_if_fail (error != NULL);
if (simple->error)
g_error_free (simple->error);
simple->error = g_error_copy (error);
simple->failed = TRUE;
}
/**
* g_simple_async_result_take_error: (skip)
* @simple: a #GSimpleAsyncResult
* @error: a #GError
*
* Sets the result from @error, and takes over the caller's ownership
* of @error, so the caller does not need to free it any more.
*
* Since: 2.28
*
* Deprecated: 2.46: Use #GTask and g_task_return_error() instead.
**/
void
g_simple_async_result_take_error (GSimpleAsyncResult *simple,
GError *error)
{
g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
g_return_if_fail (error != NULL);
if (simple->error)
g_error_free (simple->error);
simple->error = error;
simple->failed = TRUE;
}
/**
* g_simple_async_result_set_error_va: (skip)
* @simple: a #GSimpleAsyncResult.
* @domain: a #GQuark (usually #G_IO_ERROR).
* @code: an error code.
* @format: a formatted error reporting string.
* @args: va_list of arguments.
*
* Sets an error within the asynchronous result without a #GError.
* Unless writing a binding, see g_simple_async_result_set_error().
*
* Deprecated: 2.46: Use #GTask and g_task_return_error() instead.
**/
void
g_simple_async_result_set_error_va (GSimpleAsyncResult *simple,
GQuark domain,
gint code,
const char *format,
va_list args)
{
g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
g_return_if_fail (domain != 0);
g_return_if_fail (format != NULL);
if (simple->error)
g_error_free (simple->error);
simple->error = g_error_new_valist (domain, code, format, args);
simple->failed = TRUE;
}
/**
* g_simple_async_result_set_error: (skip)
* @simple: a #GSimpleAsyncResult.
* @domain: a #GQuark (usually #G_IO_ERROR).
* @code: an error code.
* @format: a formatted error reporting string.
* @...: a list of variables to fill in @format.
*
* Sets an error within the asynchronous result without a #GError.
*
* Deprecated: 2.46: Use #GTask and g_task_return_new_error() instead.
**/
void
g_simple_async_result_set_error (GSimpleAsyncResult *simple,
GQuark domain,
gint code,
const char *format,
...)
{
va_list args;
g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
g_return_if_fail (domain != 0);
g_return_if_fail (format != NULL);
va_start (args, format);
g_simple_async_result_set_error_va (simple, domain, code, format, args);
va_end (args);
}
/**
* g_simple_async_result_complete:
* @simple: a #GSimpleAsyncResult.
*
* Completes an asynchronous I/O job immediately. Must be called in
* the thread where the asynchronous result was to be delivered, as it
* invokes the callback directly. If you are in a different thread use
* g_simple_async_result_complete_in_idle().
*
* Calling this function takes a reference to @simple for as long as
* is needed to complete the call.
*
* Deprecated: 2.46: Use #GTask instead.
**/
void
g_simple_async_result_complete (GSimpleAsyncResult *simple)
{
#ifndef G_DISABLE_CHECKS
GSource *current_source;
GMainContext *current_context;
#endif
g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
#ifndef G_DISABLE_CHECKS
current_source = g_main_current_source ();
if (current_source && !g_source_is_destroyed (current_source))
{
current_context = g_source_get_context (current_source);
if (simple->context != current_context)
g_warning ("g_simple_async_result_complete() called from wrong context!");
}
#endif
if (simple->callback)
{
g_main_context_push_thread_default (simple->context);
simple->callback (simple->source_object,
G_ASYNC_RESULT (simple),
simple->user_data);
g_main_context_pop_thread_default (simple->context);
}
}
static gboolean
complete_in_idle_cb (gpointer data)
{
GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (data);
g_simple_async_result_complete (simple);
return FALSE;
}
/**
* g_simple_async_result_complete_in_idle:
* @simple: a #GSimpleAsyncResult.
*
* Completes an asynchronous function in an idle handler in the
* [thread-default main context][g-main-context-push-thread-default]
* of the thread that @simple was initially created in
* (and re-pushes that context around the invocation of the callback).
*
* Calling this function takes a reference to @simple for as long as
* is needed to complete the call.
*
* Deprecated: 2.46: Use #GTask instead.
*/
void
g_simple_async_result_complete_in_idle (GSimpleAsyncResult *simple)
{
GSource *source;
g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
g_object_ref (simple);
source = g_idle_source_new ();
g_source_set_priority (source, G_PRIORITY_DEFAULT);
g_source_set_callback (source, complete_in_idle_cb, simple, g_object_unref);
g_source_set_name (source, "[gio] complete_in_idle_cb");
g_source_attach (source, simple->context);
g_source_unref (source);
}
typedef struct {
GSimpleAsyncResult *simple;
GCancellable *cancellable;
GSimpleAsyncThreadFunc func;
} RunInThreadData;
static gboolean
complete_in_idle_cb_for_thread (gpointer _data)
{
RunInThreadData *data = _data;
GSimpleAsyncResult *simple;
simple = data->simple;
if (simple->handle_cancellation &&
g_cancellable_is_cancelled (data->cancellable))
g_simple_async_result_set_error (simple,
G_IO_ERROR,
G_IO_ERROR_CANCELLED,
"%s", _("Operation was cancelled"));
g_simple_async_result_complete (simple);
if (data->cancellable)
g_object_unref (data->cancellable);
g_object_unref (data->simple);
g_free (data);
return FALSE;
}
static gboolean
run_in_thread (GIOSchedulerJob *job,
GCancellable *c,
gpointer _data)
{
RunInThreadData *data = _data;
GSimpleAsyncResult *simple = data->simple;
GSource *source;
if (simple->handle_cancellation &&
g_cancellable_is_cancelled (c))
g_simple_async_result_set_error (simple,
G_IO_ERROR,
G_IO_ERROR_CANCELLED,
"%s", _("Operation was cancelled"));
else
data->func (simple,
simple->source_object,
c);
source = g_idle_source_new ();
g_source_set_priority (source, G_PRIORITY_DEFAULT);
g_source_set_callback (source, complete_in_idle_cb_for_thread, data, NULL);
g_source_set_name (source, "[gio] complete_in_idle_cb_for_thread");
g_source_attach (source, simple->context);
g_source_unref (source);
return FALSE;
}
/**
* g_simple_async_result_run_in_thread: (skip)
* @simple: a #GSimpleAsyncResult.
* @func: a #GSimpleAsyncThreadFunc.
* @io_priority: the io priority of the request.
* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
*
* Runs the asynchronous job in a separate thread and then calls
* g_simple_async_result_complete_in_idle() on @simple to return
* the result to the appropriate main loop.
*
* Calling this function takes a reference to @simple for as long as
* is needed to run the job and report its completion.
*
* Deprecated: 2.46: Use #GTask and g_task_run_in_thread() instead.
*/
void
g_simple_async_result_run_in_thread (GSimpleAsyncResult *simple,
GSimpleAsyncThreadFunc func,
int io_priority,
GCancellable *cancellable)
{
RunInThreadData *data;
g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
g_return_if_fail (func != NULL);
data = g_new (RunInThreadData, 1);
data->func = func;
data->simple = g_object_ref (simple);
data->cancellable = cancellable;
if (cancellable)
g_object_ref (cancellable);
G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
g_io_scheduler_push_job (run_in_thread, data, NULL, io_priority, cancellable);
G_GNUC_END_IGNORE_DEPRECATIONS;
}
/**
* g_simple_async_result_is_valid:
* @result: the #GAsyncResult passed to the _finish function.
* @source: (nullable): the #GObject passed to the _finish function.
* @source_tag: (nullable): the asynchronous function.
*
* Ensures that the data passed to the _finish function of an async
* operation is consistent. Three checks are performed.
*
* First, @result is checked to ensure that it is really a
* #GSimpleAsyncResult. Second, @source is checked to ensure that it
* matches the source object of @result. Third, @source_tag is
* checked to ensure that it is equal to the @source_tag argument given
* to g_simple_async_result_new() (which, by convention, is a pointer
* to the _async function corresponding to the _finish function from
* which this function is called). (Alternatively, if either
* @source_tag or @result's source tag is %NULL, then the source tag
* check is skipped.)
*
* Returns: #TRUE if all checks passed or #FALSE if any failed.
*
* Since: 2.20
*
* Deprecated: 2.46: Use #GTask and g_task_is_valid() instead.
**/
gboolean
g_simple_async_result_is_valid (GAsyncResult *result,
GObject *source,
gpointer source_tag)
{
GSimpleAsyncResult *simple;
GObject *cmp_source;
gpointer result_source_tag;
if (!G_IS_SIMPLE_ASYNC_RESULT (result))
return FALSE;
simple = (GSimpleAsyncResult *)result;
cmp_source = g_async_result_get_source_object (result);
if (cmp_source != source)
{
if (cmp_source != NULL)
g_object_unref (cmp_source);
return FALSE;
}
if (cmp_source != NULL)
g_object_unref (cmp_source);
result_source_tag = g_simple_async_result_get_source_tag (simple);
return source_tag == NULL || result_source_tag == NULL ||
source_tag == result_source_tag;
}
/**
* g_simple_async_report_error_in_idle: (skip)
* @object: (nullable): a #GObject, or %NULL.
* @callback: a #GAsyncReadyCallback.
* @user_data: user data passed to @callback.
* @domain: a #GQuark containing the error domain (usually #G_IO_ERROR).
* @code: a specific error code.
* @format: a formatted error reporting string.
* @...: a list of variables to fill in @format.
*
* Reports an error in an asynchronous function in an idle function by
* directly setting the contents of the #GAsyncResult with the given error
* information.
*
* Deprecated: 2.46: Use g_task_report_error().
**/
void
g_simple_async_report_error_in_idle (GObject *object,
GAsyncReadyCallback callback,
gpointer user_data,
GQuark domain,
gint code,
const char *format,
...)
{
GSimpleAsyncResult *simple;
va_list args;
g_return_if_fail (!object || G_IS_OBJECT (object));
g_return_if_fail (domain != 0);
g_return_if_fail (format != NULL);
simple = g_simple_async_result_new (object,
callback,
user_data, NULL);
va_start (args, format);
g_simple_async_result_set_error_va (simple, domain, code, format, args);
va_end (args);
g_simple_async_result_complete_in_idle (simple);
g_object_unref (simple);
}
/**
* g_simple_async_report_gerror_in_idle:
* @object: (nullable): a #GObject, or %NULL
* @callback: (scope async): a #GAsyncReadyCallback.
* @user_data: (closure): user data passed to @callback.
* @error: the #GError to report
*
* Reports an error in an idle function. Similar to
* g_simple_async_report_error_in_idle(), but takes a #GError rather
* than building a new one.
*
* Deprecated: 2.46: Use g_task_report_error().
**/
void
g_simple_async_report_gerror_in_idle (GObject *object,
GAsyncReadyCallback callback,
gpointer user_data,
const GError *error)
{
GSimpleAsyncResult *simple;
g_return_if_fail (!object || G_IS_OBJECT (object));
g_return_if_fail (error != NULL);
simple = g_simple_async_result_new_from_error (object,
callback,
user_data,
error);
g_simple_async_result_complete_in_idle (simple);
g_object_unref (simple);
}
/**
* g_simple_async_report_take_gerror_in_idle: (skip)
* @object: (nullable): a #GObject, or %NULL
* @callback: a #GAsyncReadyCallback.
* @user_data: user data passed to @callback.
* @error: the #GError to report
*
* Reports an error in an idle function. Similar to
* g_simple_async_report_gerror_in_idle(), but takes over the caller's
* ownership of @error, so the caller does not have to free it any more.
*
* Since: 2.28
*
* Deprecated: 2.46: Use g_task_report_error().
**/
void
g_simple_async_report_take_gerror_in_idle (GObject *object,
GAsyncReadyCallback callback,
gpointer user_data,
GError *error)
{
GSimpleAsyncResult *simple;
g_return_if_fail (!object || G_IS_OBJECT (object));
g_return_if_fail (error != NULL);
simple = g_simple_async_result_new_take_error (object,
callback,
user_data,
error);
g_simple_async_result_complete_in_idle (simple);
g_object_unref (simple);
}
/**
* g_simple_async_result_set_check_cancellable:
* @simple: a #GSimpleAsyncResult
* @check_cancellable: (nullable): a #GCancellable to check, or %NULL to unset
*
* Sets a #GCancellable to check before dispatching results.
*
* This function has one very specific purpose: the provided cancellable
* is checked at the time of g_simple_async_result_propagate_error() If
* it is cancelled, these functions will return an "Operation was
* cancelled" error (%G_IO_ERROR_CANCELLED).
*
* Implementors of cancellable asynchronous functions should use this in
* order to provide a guarantee to their callers that cancelling an
* async operation will reliably result in an error being returned for
* that operation (even if a positive result for the operation has
* already been sent as an idle to the main context to be dispatched).
*
* The checking described above is done regardless of any call to the
* unrelated g_simple_async_result_set_handle_cancellation() function.
*
* Since: 2.32
*
* Deprecated: 2.46: Use #GTask instead.
**/
void
g_simple_async_result_set_check_cancellable (GSimpleAsyncResult *simple,
GCancellable *check_cancellable)
{
g_return_if_fail (G_IS_SIMPLE_ASYNC_RESULT (simple));
g_return_if_fail (check_cancellable == NULL || G_IS_CANCELLABLE (check_cancellable));
g_clear_object (&simple->check_cancellable);
if (check_cancellable)
simple->check_cancellable = g_object_ref (check_cancellable);
}
G_GNUC_END_IGNORE_DEPRECATIONS
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