1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
/*
Copyright 1989, 1998 The Open Group
Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of The Open Group shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from The Open Group.
*/
/*
* Author: Jim Fulton, MIT X Consortium
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <X11/Xlib.h>
#include <stdlib.h>
#include <X11/Xmu/DisplayQue.h>
/*
* Prototypes
*/
static int _DQCloseDisplay(Display*, XPointer);
#define CallCloseCallback(q,e) (void) (*((q)->closefunc)) ((q), (e))
#define CallFreeCallback(q) (void) (*((q)->freefunc)) ((q))
/*
* XmuDQCreate - create a display queue
*/
XmuDisplayQueue *
XmuDQCreate(XmuCloseDisplayQueueProc closefunc,
XmuFreeDisplayQueueProc freefunc,
XPointer data)
{
XmuDisplayQueue *q = (XmuDisplayQueue *) malloc (sizeof (XmuDisplayQueue));
if (q) {
q->nentries = 0;
q->head = q->tail = NULL;
q->closefunc = closefunc;
q->freefunc = freefunc;
q->data = data;
}
return q;
}
/*
* XmuDQDestroy - free all storage associated with this display queue,
* optionally invoking the close callbacks.
*/
Bool
XmuDQDestroy(XmuDisplayQueue *q, Bool docallbacks)
{
XmuDisplayQueueEntry *e = q->head;
while (e) {
XmuDisplayQueueEntry *nexte = e->next;
if (docallbacks && q->closefunc) CallCloseCallback (q, e);
free ((char *) e);
e = nexte;
}
free ((char *) q);
return True;
}
/*
* XmuDQLookupDisplay - finds the indicated display on the given queue
*/
XmuDisplayQueueEntry *
XmuDQLookupDisplay(XmuDisplayQueue *q, Display *dpy)
{
XmuDisplayQueueEntry *e;
for (e = q->head; e; e = e->next) {
if (e->display == dpy) return e;
}
return NULL;
}
/*
* XmuDQAddDisplay - add the specified display to the queue; set data as a
* convenience. Does not ensure that dpy hasn't already been added.
*/
XmuDisplayQueueEntry *
XmuDQAddDisplay(XmuDisplayQueue *q, Display *dpy, XPointer data)
{
XmuDisplayQueueEntry *e;
if (!(e = (XmuDisplayQueueEntry *) malloc (sizeof (XmuDisplayQueueEntry)))) {
return NULL;
}
if (!(e->closehook = XmuAddCloseDisplayHook (dpy, _DQCloseDisplay,
(XPointer) q))) {
free ((char *) e);
return NULL;
}
e->display = dpy;
e->next = NULL;
e->data = data;
if (q->tail) {
q->tail->next = e;
e->prev = q->tail;
} else {
q->head = e;
e->prev = NULL;
}
q->tail = e;
q->nentries++;
return e;
}
/*
* XmuDQRemoveDisplay - remove the specified display from the queue
*/
Bool
XmuDQRemoveDisplay(XmuDisplayQueue *q, Display *dpy)
{
XmuDisplayQueueEntry *e;
for (e = q->head; e; e = e->next) {
if (e->display == dpy) {
if (q->head == e)
q->head = e->next; /* if at head, then bump head */
else
e->prev->next = e->next; /* else splice out */
if (q->tail == e)
q->tail = e->prev; /* if at tail, then bump tail */
else
e->next->prev = e->prev; /* else splice out */
(void) XmuRemoveCloseDisplayHook (dpy, e->closehook,
_DQCloseDisplay, (XPointer) q);
free ((char *) e);
q->nentries--;
return True;
}
}
return False;
}
/*****************************************************************************
* private functions *
*****************************************************************************/
/*
* _DQCloseDisplay - upcalled from CloseHook to notify this queue; remove the
* display when finished
*/
static int
_DQCloseDisplay(Display *dpy, XPointer arg)
{
XmuDisplayQueue *q = (XmuDisplayQueue *) arg;
XmuDisplayQueueEntry *e;
for (e = q->head; e; e = e->next) {
if (e->display == dpy) {
if (q->closefunc) CallCloseCallback (q, e);
(void) XmuDQRemoveDisplay (q, dpy);
if (q->nentries == 0 && q->freefunc) CallFreeCallback (q);
return 1;
}
}
return 0;
}
|
