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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 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: Alexander Larsson <alexl@redhat.com>
*/
#include "config.h"
#include "gasynchelper.h"
#include "gioalias.h"
/**
* SECTION:gasynchelper
* @short_description: Asynchronous Helper Functions
* @include: gio/gio.h
* @see_also: #GAsyncReady
*
* Provides helper functions for asynchronous operations.
*
**/
static void
async_result_free (gpointer data)
{
GAsyncResultData *res = data;
if (res->error)
g_error_free (res->error);
g_object_unref (res->async_object);
g_free (res);
}
void
_g_queue_async_result (GAsyncResultData *result,
gpointer async_object,
GError *error,
gpointer user_data,
GSourceFunc source_func)
{
GSource *source;
g_return_if_fail (G_IS_OBJECT (async_object));
result->async_object = g_object_ref (async_object);
result->user_data = user_data;
result->error = error;
source = g_idle_source_new ();
g_source_set_priority (source, G_PRIORITY_DEFAULT);
g_source_set_callback (source, source_func, result, async_result_free);
g_source_attach (source, NULL);
g_source_unref (source);
}
/*************************************************************************
* fd source *
************************************************************************/
typedef struct
{
GSource source;
GPollFD pollfd;
GCancellable *cancellable;
gulong cancelled_tag;
} FDSource;
static gboolean
fd_source_prepare (GSource *source,
gint *timeout)
{
FDSource *fd_source = (FDSource *)source;
*timeout = -1;
return g_cancellable_is_cancelled (fd_source->cancellable);
}
static gboolean
fd_source_check (GSource *source)
{
FDSource *fd_source = (FDSource *)source;
return
g_cancellable_is_cancelled (fd_source->cancellable) ||
fd_source->pollfd.revents != 0;
}
static gboolean
fd_source_dispatch (GSource *source,
GSourceFunc callback,
gpointer user_data)
{
GFDSourceFunc func = (GFDSourceFunc)callback;
FDSource *fd_source = (FDSource *)source;
g_warn_if_fail (func != NULL);
return (*func) (user_data, fd_source->pollfd.revents, fd_source->pollfd.fd);
}
static void
fd_source_finalize (GSource *source)
{
FDSource *fd_source = (FDSource *)source;
if (fd_source->cancelled_tag)
g_signal_handler_disconnect (fd_source->cancellable,
fd_source->cancelled_tag);
if (fd_source->cancellable)
g_object_unref (fd_source->cancellable);
}
static GSourceFuncs fd_source_funcs = {
fd_source_prepare,
fd_source_check,
fd_source_dispatch,
fd_source_finalize
};
/* Might be called on another thread */
static void
fd_source_cancelled_cb (GCancellable *cancellable,
gpointer data)
{
/* Wake up the mainloop in case we're waiting on async calls with FDSource */
g_main_context_wakeup (NULL);
}
GSource *
_g_fd_source_new (int fd,
gushort events,
GCancellable *cancellable)
{
GSource *source;
FDSource *fd_source;
source = g_source_new (&fd_source_funcs, sizeof (FDSource));
fd_source = (FDSource *)source;
if (cancellable)
fd_source->cancellable = g_object_ref (cancellable);
fd_source->pollfd.fd = fd;
fd_source->pollfd.events = events;
g_source_add_poll (source, &fd_source->pollfd);
if (cancellable)
fd_source->cancelled_tag =
g_signal_connect_data (cancellable, "cancelled",
(GCallback)fd_source_cancelled_cb,
NULL, NULL,
0);
return source;
}
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