glib.Once source code

1 /*
2  * This file is part of gtkD.
3  *
4  * gtkD is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU Lesser General Public License
6  * as published by the Free Software Foundation; either version 3
7  * of the License, or (at your option) any later version, with
8  * some exceptions, please read the COPYING file.
9  *
10  * gtkD 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
13  * GNU Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public License
16  * along with gtkD; if not, write to the Free Software
17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
18  */
19 
20 // generated automatically - do not change
21 // find conversion definition on APILookup.txt
22 // implement new conversion functionalities on the wrap.utils pakage
23 
24 
25 module glib.Once;
26 
27 private import gtkc.glib;
28 public  import gtkc.glibtypes;
29 
30 
31 /**
32  * A #GOnce struct controls a one-time initialization function. Any
33  * one-time initialization function must have its own unique #GOnce
34  * struct.
35  *
36  * Since: 2.4
37  */
38 public class Once
39 {
40 	/** the main Gtk struct */
41 	protected GOnce* gOnce;
42 
43 	/** Get the main Gtk struct */
44 	public GOnce* getOnceStruct()
45 	{
46 		return gOnce;
47 	}
48 
49 	/** the main Gtk struct as a void* */
50 	protected void* getStruct()
51 	{
52 		return cast(void*)gOnce;
53 	}
54 
55 	/**
56 	 * Sets our main struct and passes it to the parent class.
57 	 */
58 	public this (GOnce* gOnce)
59 	{
60 		this.gOnce = gOnce;
61 	}
62 
63 
64 	/** */
65 	public void* impl(GThreadFunc func, void* arg)
66 	{
67 		return g_once_impl(gOnce, func, arg);
68 	}
69 
70 	/**
71 	 * Function to be called when starting a critical initialization
72 	 * section. The argument @location must point to a static
73 	 * 0-initialized variable that will be set to a value other than 0 at
74 	 * the end of the initialization section. In combination with
75 	 * g_once_init_leave() and the unique address @value_location, it can
76 	 * be ensured that an initialization section will be executed only once
77 	 * during a program's life time, and that concurrent threads are
78 	 * blocked until initialization completed. To be used in constructs
79 	 * like this:
80 	 *
81 	 * |[<!-- language="C" -->
82 	 * static gsize initialization_value = 0;
83 	 *
84 	 * if (g_once_init_enter (&initialization_value))
85 	 * {
86 	 * gsize setup_value = 42; // initialization code here
87 	 *
88 	 * g_once_init_leave (&initialization_value, setup_value);
89 	 * }
90 	 *
91 	 * // use initialization_value here
92 	 * ]|
93 	 *
94 	 * Params:
95 	 *     location = location of a static initializable variable containing 0
96 	 *
97 	 * Return: %TRUE if the initialization section should be entered,
98 	 *     %FALSE and blocks otherwise
99 	 *
100 	 * Since: 2.14
101 	 */
102 	public static bool initEnter(void* location)
103 	{
104 		return g_once_init_enter(location) != 0;
105 	}
106 
107 	/**
108 	 * Counterpart to g_once_init_enter(). Expects a location of a static
109 	 * 0-initialized initialization variable, and an initialization value
110 	 * other than 0. Sets the variable to the initialization value, and
111 	 * releases concurrent threads blocking in g_once_init_enter() on this
112 	 * initialization variable.
113 	 *
114 	 * Params:
115 	 *     location = location of a static initializable variable containing 0
116 	 *     result = new non-0 value for *@value_location
117 	 *
118 	 * Since: 2.14
119 	 */
120 	public static void initLeave(void* location, size_t result)
121 	{
122 		g_once_init_leave(location, result);
123 	}
124 }