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Bug 618882 – No way to ensure that a message is sent

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Add g_dbus_connection_flush{_finish,sync}().

https://bugzilla.gnome.org/show_bug.cgi?id=618882

Signed-off-by: David Zeuthen <davidz@redhat.com>
This commit is contained in:
David Zeuthen 2010-07-07 15:00:23 -04:00
parent d4f35ae9ed
commit 62a1ccf526
9 changed files with 406 additions and 3 deletions
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3
docs/reference/gio/gio-sections.txt
View File

@ -2396,6 +2396,9 @@ g_dbus_connection_start_message_processing
GDBusCapabilityFlags
g_dbus_connection_close
g_dbus_connection_is_closed
g_dbus_connection_flush
g_dbus_connection_flush_finish
g_dbus_connection_flush_sync
g_dbus_connection_get_exit_on_close
g_dbus_connection_set_exit_on_close
g_dbus_connection_get_stream

157
gio/gdbusconnection.c
View File

@ -882,6 +882,151 @@ g_dbus_connection_get_capabilities (GDBusConnection *connection)
return connection->priv->capabilities;
}
/* ---------------------------------------------------------------------------------------------------- */
static void
flush_in_thread_func (GSimpleAsyncResult *res,
GObject *object,
GCancellable *cancellable)
{
GError *error;
error = NULL;
if (!g_dbus_connection_flush_sync (G_DBUS_CONNECTION (object),
cancellable,
&error))
{
g_simple_async_result_set_from_error (res, error);
g_error_free (error);
}
}
/**
* g_dbus_connection_flush:
* @connection: A #GDBusConnection.
* @cancellable: A #GCancellable or %NULL.
* @callback: A #GAsyncReadyCallback to call when the request is satisfied or %NULL if you don't
* care about the result.
* @user_data: The data to pass to @callback.
*
* Asynchronously flushes @connection, that is, writes all queued
* outgoing message to the transport and then flushes the transport
* (using g_output_stream_flush_async()). This is useful in programs
* that wants to emit a D-Bus signal and then exit
* immediately. Without flushing the connection, there is no guarantee
* that the message has been sent to the networking buffers in the OS
* kernel.
*
* This is an asynchronous method. When the operation is finished,
* @callback will be invoked in the <link
* linkend="g-main-context-push-thread-default">thread-default main
* loop</link> of the thread you are calling this method from. You can
* then call g_dbus_connection_flush_finish() to get the result of the
* operation. See g_dbus_connection_flush_sync() for the synchronous
* version.
*
* Since: 2.26
*/
void
g_dbus_connection_flush (GDBusConnection *connection,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GSimpleAsyncResult *simple;
g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
simple = g_simple_async_result_new (NULL,
callback,
user_data,
g_dbus_connection_flush);
g_simple_async_result_run_in_thread (simple,
flush_in_thread_func,
G_PRIORITY_DEFAULT,
cancellable);
g_object_unref (simple);
}
/**
* g_dbus_connection_flush_finish:
* @connection: A #GDBusConnection.
* @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_connection_flush().
* @error: Return location for error or %NULL.
*
* Finishes an operation started with g_dbus_connection_flush().
*
* Returns: %TRUE if the operation succeeded, %FALSE if @error is set.
*
* Since: 2.26
*/
gboolean
g_dbus_connection_flush_finish (GDBusConnection *connection,
GAsyncResult *res,
GError **error)
{
GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
gboolean ret;
ret = FALSE;
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
g_return_val_if_fail (G_IS_ASYNC_RESULT (res), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_dbus_connection_flush);
if (g_simple_async_result_propagate_error (simple, error))
goto out;
ret = TRUE;
out:
return ret;
}
/**
* g_dbus_connection_flush_sync:
* @connection: A #GDBusConnection.
* @cancellable: A #GCancellable or %NULL.
* @error: Return location for error or %NULL.
*
* Synchronously flushes @connection. The calling thread is blocked
* until this is done. See g_dbus_connection_flush() for the
* asynchronous version of this method and more details about what it
* does.
*
* Returns: %TRUE if the operation succeeded, %FALSE if @error is set.
*
* Since: 2.26
*/
gboolean
g_dbus_connection_flush_sync (GDBusConnection *connection,
GCancellable *cancellable,
GError **error)
{
gboolean ret;
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
ret = FALSE;
if (connection->priv->closed)
{
g_set_error_literal (error,
G_IO_ERROR,
G_IO_ERROR_CLOSED,
_("The connection is closed"));
goto out;
}
ret = _g_dbus_worker_flush_sync (connection->priv->worker,
cancellable,
error);
out:
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
@ -955,7 +1100,14 @@ set_closed_unlocked (GDBusConnection *connection,
*
* Closes @connection. Note that this never causes the process to
* exit (this might only happen if the other end of a shared message
* bus connection disconnects).
* bus connection disconnects, see #GDBusConnection:exit-on-close).
*
* Once the stream is closed, all operations will return
* %G_IO_ERROR_CLOSED.
*
* Note that closing a connection will not automatically flush the
* connection so queued messages may be lost. Use
* g_dbus_connection_flush() if you need such guarantees.
*
* If @connection is already closed, this method does nothing.
*
@ -1091,8 +1243,7 @@ g_dbus_connection_send_message_unlocked (GDBusConnection *connection,
* submitting the message to the underlying transport.
*
* If @connection is closed then the operation will fail with
* %G_IO_ERROR_CLOSED. If @cancellable is canceled, the operation will
* fail with %G_IO_ERROR_CANCELLED. If @message is not well-formed,
* %G_IO_ERROR_CLOSED. If @message is not well-formed,
* the operation fails with %G_IO_ERROR_INVALID_ARGUMENT.
*
* See <xref linkend="gdbus-server"/> and <xref

14
gio/gdbusconnection.h
View File

@ -139,6 +139,20 @@ gboolean g_dbus_connection_get_exit_on_close (GDBusConnection
void g_dbus_connection_set_exit_on_close (GDBusConnection *connection,
gboolean exit_on_close);
GDBusCapabilityFlags g_dbus_connection_get_capabilities (GDBusConnection *connection);
/* ---------------------------------------------------------------------------------------------------- */
void g_dbus_connection_flush (GDBusConnection *connection,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
gboolean g_dbus_connection_flush_finish (GDBusConnection *connection,
GAsyncResult *res,
GError **error);
gboolean g_dbus_connection_flush_sync (GDBusConnection *connection,
GCancellable *cancellable,
GError **error);
/* ---------------------------------------------------------------------------------------------------- */
gboolean g_dbus_connection_send_message (GDBusConnection *connection,

81
gio/gdbusprivate.c
View File

@ -388,8 +388,17 @@ struct GDBusWorker
GMutex *write_lock;
GQueue *write_queue;
gboolean write_is_pending;
guint64 write_num_messages_written;
GList *write_pending_flushes;
};
typedef struct
{
GMutex *mutex;
GCond *cond;
guint64 number_to_wait_for;
} FlushData;
struct _MessageToWriteData ;
typedef struct _MessageToWriteData MessageToWriteData;
@ -407,6 +416,8 @@ _g_dbus_worker_unref (GDBusWorker *worker)
{
if (g_atomic_int_dec_and_test (&worker->ref_count))
{
g_assert (worker->write_pending_flushes == NULL);
_g_dbus_shared_thread_unref ();
g_object_unref (worker->stream);
@ -815,6 +826,8 @@ write_message (GDBusWorker *worker,
GError **error)
{
gboolean ret;
GList *l;
GList *ll;
g_return_val_if_fail (data->blob_size > 16, FALSE);
@ -908,6 +921,24 @@ write_message (GDBusWorker *worker,
ret = TRUE;
/* wake up pending flushes */
g_mutex_lock (worker->write_lock);
worker->write_num_messages_written += 1;
for (l = worker->write_pending_flushes; l != NULL; l = ll)
{
FlushData *f = l->data;
ll = l->next;
if (f->number_to_wait_for == worker->write_num_messages_written)
{
g_mutex_lock (f->mutex);
g_cond_signal (f->cond);
g_mutex_unlock (f->mutex);
worker->write_pending_flushes = g_list_delete_link (worker->write_pending_flushes, l);
}
}
g_mutex_unlock (worker->write_lock);
if (G_UNLIKELY (_g_dbus_debug_message ()))
{
gchar *s;
@ -1072,6 +1103,8 @@ _g_dbus_worker_new (GIOStream *stream,
return worker;
}
/* ---------------------------------------------------------------------------------------------------- */
/* This can be called from any thread - frees worker - guarantees no callbacks
* will ever be issued again
*/
@ -1092,6 +1125,54 @@ _g_dbus_worker_stop (GDBusWorker *worker)
_g_dbus_worker_unref (worker);
}
/* ---------------------------------------------------------------------------------------------------- */
/* can be called from any thread (except the worker thread) - blocks
* calling thread until all queued outgoing messages are written and
* the transport has been flushed
*/
gboolean
_g_dbus_worker_flush_sync (GDBusWorker *worker,
GCancellable *cancellable,
GError **error)
{
gboolean ret;
FlushData *data;
data = NULL;
/* if the queue is empty, there's nothing to wait for */
g_mutex_lock (worker->write_lock);
if (g_queue_get_length (worker->write_queue) > 0)
{
data = g_new0 (FlushData, 1);
data->mutex = g_mutex_new ();
data->cond = g_cond_new ();
data->number_to_wait_for = worker->write_num_messages_written + g_queue_get_length (worker->write_queue);
g_mutex_lock (data->mutex);
worker->write_pending_flushes = g_list_prepend (worker->write_pending_flushes, data);
}
g_mutex_unlock (worker->write_lock);
if (data != NULL)
{
g_cond_wait (data->cond, data->mutex);
g_mutex_unlock (data->mutex);
/* note:the element is removed from worker->write_pending_flushes in write_message() */
g_cond_free (data->cond);
g_mutex_free (data->mutex);
g_free (data);
}
ret = g_output_stream_flush (g_io_stream_get_output_stream (worker->stream),
cancellable,
error);
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
#define G_DBUS_DEBUG_AUTHENTICATION (1<<0)
#define G_DBUS_DEBUG_MESSAGE (1<<1)
#define G_DBUS_DEBUG_PAYLOAD (1<<2)

5
gio/gdbusprivate.h
View File

@ -71,6 +71,11 @@ void _g_dbus_worker_stop (GDBusWorker *worker);
/* can be called from any thread */
void _g_dbus_worker_unfreeze (GDBusWorker *worker);
/* can be called from any thread (except the worker thread) */
gboolean _g_dbus_worker_flush_sync (GDBusWorker *worker,
GCancellable *cancellable,
GError **error);
/* ---------------------------------------------------------------------------------------------------- */
void _g_dbus_initialize (void);

3
gio/gio.symbols
View File

@ -1541,6 +1541,9 @@ g_dbus_connection_get_unique_name
g_dbus_connection_is_closed
g_dbus_connection_set_exit_on_close
g_dbus_connection_close
g_dbus_connection_flush
g_dbus_connection_flush_finish
g_dbus_connection_flush_sync
g_dbus_connection_emit_signal
g_dbus_connection_call
g_dbus_connection_call_finish

4
gio/tests/Makefile.am
View File

@ -81,6 +81,7 @@ SAMPLE_PROGS = \
gdbus-example-subtree \
gdbus-example-peer \
gdbus-example-proxy-subclass \
gdbus-connection-flush-helper \
testapp \
appinfo-test \
$(NULL)
@ -264,6 +265,9 @@ gdbus_example_proxy_subclass_LDADD = $(progs_ldadd)
gdbus_example_export_SOURCES = gdbus-example-export.c
gdbus_example_export_LDADD = $(progs_ldadd)
gdbus_connection_flush_helper_SOURCES = gdbus-connection-flush-helper.c
gdbus_connection_flush_helper_LDADD = $(progs_ldadd)
application_SOURCES = application.c gdbus-sessionbus.c gdbus-sessionbus.h
application_LDADD = $(progs_ldadd)

60
gio/tests/gdbus-connection-flush-helper.c Normal file
View File

@ -0,0 +1,60 @@
/* GLib testing framework examples and tests
*
* Copyright (C) 2008-2010 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 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, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: David Zeuthen <davidz@redhat.com>
*/
#include <gio/gio.h>
int
main (int argc,
char *argv[])
{
GDBusConnection *c;
GError *error;
gboolean ret;
g_type_init ();
error = NULL;
c = g_bus_get_sync (G_BUS_TYPE_SESSION,
NULL, /* GCancellable* */
&error);
g_assert_no_error (error);
error = NULL;
g_dbus_connection_emit_signal (c,
NULL, /* const gchar *destination_bus_name */
"/org/gtk/GDBus/FlushObject",
"org.gtk.GDBus.FlushInterface",
"SomeSignal",
NULL, /* GVariant *parameters */
&error);
g_assert_no_error (error);
error = NULL;
ret = g_dbus_connection_flush_sync (c,
NULL, /* GCancellable* */
&error);
g_assert_no_error (error);
g_assert (ret);
/* and now exit immediately! */
return 0;
}

82
gio/tests/gdbus-connection.c
View File

@ -24,6 +24,9 @@
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "gdbus-tests.h"
/* all tests rely on a shared mainloop */
@ -661,6 +664,84 @@ test_connection_filter (void)
/* ---------------------------------------------------------------------------------------------------- */
static void
test_connection_flush_signal_handler (GDBusConnection *connection,
const gchar *sender_name,
const gchar *object_path,
const gchar *interface_name,
const gchar *signal_name,
GVariant *parameters,
gpointer user_data)
{
g_main_loop_quit (loop);
}
static gboolean
test_connection_flush_on_timeout (gpointer user_data)
{
guint iteration = GPOINTER_TO_UINT (user_data);
g_printerr ("Timeout waiting 1000 msec on iteration %d\n", iteration);
g_assert_not_reached ();
return FALSE;
}
static void
test_connection_flush (void)
{
GDBusConnection *connection;
GError *error;
guint n;
guint signal_handler_id;
session_bus_up ();
error = NULL;
connection = g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, &error);
g_assert_no_error (error);
g_assert (connection != NULL);
signal_handler_id = g_dbus_connection_signal_subscribe (connection,
NULL, /* sender */
"org.gtk.GDBus.FlushInterface",
"SomeSignal",
"/org/gtk/GDBus/FlushObject",
NULL,
test_connection_flush_signal_handler,
NULL,
NULL);
g_assert_cmpint (signal_handler_id, !=, 0);
for (n = 0; n < 50; n++)
{
gboolean ret;
gint exit_status;
guint timeout_mainloop_id;
error = NULL;
ret = g_spawn_command_line_sync ("./gdbus-connection-flush-helper",
NULL, /* stdout */
NULL, /* stderr */
&exit_status,
&error);
g_assert_no_error (error);
g_assert (WIFEXITED (exit_status));
g_assert_cmpint (WEXITSTATUS (exit_status), ==, 0);
g_assert (ret);
timeout_mainloop_id = g_timeout_add (1000, test_connection_flush_on_timeout, GUINT_TO_POINTER (n));
g_main_loop_run (loop);
g_source_remove (timeout_mainloop_id);
}
g_dbus_connection_signal_unsubscribe (connection, signal_handler_id);
_g_object_wait_for_single_ref (connection);
g_object_unref (connection);
session_bus_down ();
}
/* ---------------------------------------------------------------------------------------------------- */
int
main (int argc,
char *argv[])
@ -681,5 +762,6 @@ main (int argc,
g_test_add_func ("/gdbus/connection-send", test_connection_send);
g_test_add_func ("/gdbus/connection-signals", test_connection_signals);
g_test_add_func ("/gdbus/connection-filter", test_connection_filter);
g_test_add_func ("/gdbus/connection-flush", test_connection_flush);
return g_test_run();
}