1 /*
2
3 Copyright 1989, 1998 The Open Group
4
5 Permission to use, copy, modify, distribute, and sell this software and its
6 documentation for any purpose is hereby granted without fee, provided that
7 the above copyright notice appear in all copies and that both that
8 copyright notice and this permission notice appear in supporting
9 documentation.
10
11 The above copyright notice and this permission notice shall be included in
12 all copies or substantial portions of the Software.
13
14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
18 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
19 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20
21 Except as contained in this notice, the name of The Open Group shall not be
22 used in advertising or otherwise to promote the sale, use or other dealings
23 in this Software without prior written authorization from The Open Group.
24
25 */
26
27 /*
28 * Author: Jim Fulton, MIT X Consortium
29 */
30
31 #ifdef HAVE_CONFIG_H
32 #include <config.h>
33 #endif
34 #include <stdio.h>
35 #include <X11/Xlib.h>
36 #include <stdlib.h>
37 #include <X11/Xmu/DisplayQue.h>
38
39 /*
40 * Prototypes
41 */
42 static int _DQCloseDisplay(Display*, XPointer);
43
44 #define CallCloseCallback(q,e) (void) (*((q)->closefunc)) ((q), (e))
45 #define CallFreeCallback(q) (void) (*((q)->freefunc)) ((q))
46
47 /*
48 * XmuDQCreate - create a display queue
49 */
50 XmuDisplayQueue *
XmuDQCreate(XmuCloseDisplayQueueProc closefunc,XmuFreeDisplayQueueProc freefunc,XPointer data)51 XmuDQCreate(XmuCloseDisplayQueueProc closefunc,
52 XmuFreeDisplayQueueProc freefunc,
53 XPointer data)
54 {
55 XmuDisplayQueue *q = (XmuDisplayQueue *) malloc (sizeof (XmuDisplayQueue));
56 if (q) {
57 q->nentries = 0;
58 q->head = q->tail = NULL;
59 q->closefunc = closefunc;
60 q->freefunc = freefunc;
61 q->data = data;
62 }
63 return q;
64 }
65
66
67 /*
68 * XmuDQDestroy - free all storage associated with this display queue,
69 * optionally invoking the close callbacks.
70 */
71
72 Bool
XmuDQDestroy(XmuDisplayQueue * q,Bool docallbacks)73 XmuDQDestroy(XmuDisplayQueue *q, Bool docallbacks)
74 {
75 XmuDisplayQueueEntry *e = q->head;
76
77 while (e) {
78 XmuDisplayQueueEntry *nexte = e->next;
79 if (docallbacks && q->closefunc) CallCloseCallback (q, e);
80 free ((char *) e);
81 e = nexte;
82 }
83 free ((char *) q);
84 return True;
85 }
86
87
88 /*
89 * XmuDQLookupDisplay - finds the indicated display on the given queue
90 */
91 XmuDisplayQueueEntry *
XmuDQLookupDisplay(XmuDisplayQueue * q,Display * dpy)92 XmuDQLookupDisplay(XmuDisplayQueue *q, Display *dpy)
93 {
94 XmuDisplayQueueEntry *e;
95
96 for (e = q->head; e; e = e->next) {
97 if (e->display == dpy) return e;
98 }
99 return NULL;
100 }
101
102
103 /*
104 * XmuDQAddDisplay - add the specified display to the queue; set data as a
105 * convenience. Does not ensure that dpy hasn't already been added.
106 */
107 XmuDisplayQueueEntry *
XmuDQAddDisplay(XmuDisplayQueue * q,Display * dpy,XPointer data)108 XmuDQAddDisplay(XmuDisplayQueue *q, Display *dpy, XPointer data)
109 {
110 XmuDisplayQueueEntry *e;
111
112 if (!(e = (XmuDisplayQueueEntry *) malloc (sizeof (XmuDisplayQueueEntry)))) {
113 return NULL;
114 }
115 if (!(e->closehook = XmuAddCloseDisplayHook (dpy, _DQCloseDisplay,
116 (XPointer) q))) {
117 free ((char *) e);
118 return NULL;
119 }
120
121 e->display = dpy;
122 e->next = NULL;
123 e->data = data;
124
125 if (q->tail) {
126 q->tail->next = e;
127 e->prev = q->tail;
128 } else {
129 q->head = e;
130 e->prev = NULL;
131 }
132 q->tail = e;
133 q->nentries++;
134 return e;
135 }
136
137
138 /*
139 * XmuDQRemoveDisplay - remove the specified display from the queue
140 */
141 Bool
XmuDQRemoveDisplay(XmuDisplayQueue * q,Display * dpy)142 XmuDQRemoveDisplay(XmuDisplayQueue *q, Display *dpy)
143 {
144 XmuDisplayQueueEntry *e;
145
146 for (e = q->head; e; e = e->next) {
147 if (e->display == dpy) {
148 if (q->head == e)
149 q->head = e->next; /* if at head, then bump head */
150 else
151 e->prev->next = e->next; /* else splice out */
152 if (q->tail == e)
153 q->tail = e->prev; /* if at tail, then bump tail */
154 else
155 e->next->prev = e->prev; /* else splice out */
156 (void) XmuRemoveCloseDisplayHook (dpy, e->closehook,
157 _DQCloseDisplay, (XPointer) q);
158 free ((char *) e);
159 q->nentries--;
160 return True;
161 }
162 }
163 return False;
164 }
165
166
167 /*****************************************************************************
168 * private functions *
169 *****************************************************************************/
170
171 /*
172 * _DQCloseDisplay - upcalled from CloseHook to notify this queue; remove the
173 * display when finished
174 */
175 static int
_DQCloseDisplay(Display * dpy,XPointer arg)176 _DQCloseDisplay(Display *dpy, XPointer arg)
177 {
178 XmuDisplayQueue *q = (XmuDisplayQueue *) arg;
179 XmuDisplayQueueEntry *e;
180
181 for (e = q->head; e; e = e->next) {
182 if (e->display == dpy) {
183 if (q->closefunc) CallCloseCallback (q, e);
184 (void) XmuDQRemoveDisplay (q, dpy);
185 if (q->nentries == 0 && q->freefunc) CallFreeCallback (q);
186 return 1;
187 }
188 }
189
190 return 0;
191 }
192