1 /* GIO - GLib Input, Output and Streaming Library
3 * Copyright (C) 2006-2007 Red Hat, Inc.
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.
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.
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.
20 * Author: Alexander Larsson <alexl@redhat.com>
25 #include "gasynchelper.h"
29 * SECTION:gasynchelper
30 * @short_description: Asynchronous Helper Functions
32 * @see_also: #GAsyncReady
34 * Provides helper functions for asynchronous operations.
38 /*************************************************************************
40 ************************************************************************/
46 GCancellable *cancellable;
51 fd_source_prepare (GSource *source,
54 FDSource *fd_source = (FDSource *)source;
57 return g_cancellable_is_cancelled (fd_source->cancellable);
61 fd_source_check (GSource *source)
63 FDSource *fd_source = (FDSource *)source;
66 g_cancellable_is_cancelled (fd_source->cancellable) ||
67 fd_source->pollfd.revents != 0;
71 fd_source_dispatch (GSource *source,
76 GFDSourceFunc func = (GFDSourceFunc)callback;
77 FDSource *fd_source = (FDSource *)source;
79 g_warn_if_fail (func != NULL);
81 return (*func) (fd_source->pollfd.fd, fd_source->pollfd.revents, user_data);
85 fd_source_finalize (GSource *source)
87 FDSource *fd_source = (FDSource *)source;
89 /* we don't use g_cancellable_disconnect() here, since we are holding
90 * the main context lock here, and the ::disconnect signal handler
91 * will try to grab that, and deadlock looms.
93 if (fd_source->cancelled_tag)
94 g_signal_handler_disconnect (fd_source->cancellable,
95 fd_source->cancelled_tag);
97 if (fd_source->cancellable)
98 g_object_unref (fd_source->cancellable);
102 fd_source_closure_callback (int fd,
103 GIOCondition condition,
106 GClosure *closure = data;
108 GValue params[2] = { { 0, }, { 0, } };
109 GValue result_value = { 0, };
112 g_value_init (&result_value, G_TYPE_BOOLEAN);
114 g_value_init (¶ms[0], G_TYPE_INT);
115 g_value_set_int (¶ms[0], fd);
117 g_value_init (¶ms[1], G_TYPE_IO_CONDITION);
118 g_value_set_flags (¶ms[1], condition);
120 g_closure_invoke (closure, &result_value, 2, params, NULL);
122 result = g_value_get_boolean (&result_value);
123 g_value_unset (&result_value);
124 g_value_unset (¶ms[0]);
125 g_value_unset (¶ms[1]);
131 fd_source_closure_marshal (GClosure *closure,
132 GValue *return_value,
133 guint n_param_values,
134 const GValue *param_values,
135 gpointer invocation_hint,
136 gpointer marshal_data)
138 GFDSourceFunc callback;
139 GCClosure *cc = (GCClosure*) closure;
142 g_return_if_fail (return_value != NULL);
143 g_return_if_fail (n_param_values == 0);
145 callback = (GFDSourceFunc) (marshal_data ? marshal_data : cc->callback);
147 v_return = callback (g_value_get_int (param_values),
148 g_value_get_flags (param_values + 1),
151 g_value_set_boolean (return_value, v_return);
154 static GSourceFuncs fd_source_funcs = {
159 (GSourceFunc)fd_source_closure_callback,
160 (GSourceDummyMarshal)fd_source_closure_marshal,
163 /* Might be called on another thread */
165 fd_source_cancelled_cb (GCancellable *cancellable,
168 /* Wake up the mainloop in case we're waiting on async calls with FDSource */
169 g_main_context_wakeup (NULL);
173 _g_fd_source_new (int fd,
175 GCancellable *cancellable)
180 source = g_source_new (&fd_source_funcs, sizeof (FDSource));
181 fd_source = (FDSource *)source;
184 fd_source->cancellable = g_object_ref (cancellable);
186 fd_source->pollfd.fd = fd;
187 fd_source->pollfd.events = events;
188 g_source_add_poll (source, &fd_source->pollfd);
191 fd_source->cancelled_tag =
192 g_cancellable_connect (cancellable,
193 (GCallback)fd_source_cancelled_cb,