Mercurial > sdl-ios-xcode
annotate docs/html/sdlcondbroadcast.html @ 615:7ec821f3cbd0
Date: Thu, 17 Apr 2003 23:27:34 -0400
From: Darrell Walisser
Subject: Yet another OS X cursor bug
The synopsis:
1. Call SDL_ShowCursor(0);
2. Call SDL_SetVideoMode();
3. Call SDL_GetEvent();
3. Call SDL_ShowCursor(1);
The result: Sometimes the cursor doesn't come back! Ack! Oddly enough,
it does come back when mousing over the dock or clicking in the menu
bar. But that's besides the point.
The reason why this is happening is a flaw in the handling of
activation/deactivation events. The short explanation is that the
HideCursor() and ShowCursor() calls must be balanced, but if the cursor
was initially hidden, HideCursor() was called again on the activate
event - so now the next ShowCursor() fails (as does the next, and the
next, for some reason).
So, here's the patch. All it does is keep track of the
HideCursor()/ShowCursor() calls so that they will always be balanced.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 20 Apr 2003 05:41:16 +0000 |
parents | e5bc29de3f0a |
children | 355632dca928 |
rev | line source |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_CondBroadcast</TITLE | |
5 ><META | |
6 NAME="GENERATOR" | |
55
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.64 |
0 | 8 "><LINK |
9 REL="HOME" | |
10 TITLE="SDL Library Documentation" | |
11 HREF="index.html"><LINK | |
12 REL="UP" | |
13 TITLE="Multi-threaded Programming" | |
14 HREF="thread.html"><LINK | |
15 REL="PREVIOUS" | |
16 TITLE="SDL_CondSignal" | |
17 HREF="sdlcondsignal.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_CondWait" | |
20 HREF="sdlcondwait.html"></HEAD | |
21 ><BODY | |
22 CLASS="REFENTRY" | |
23 BGCOLOR="#FFF8DC" | |
24 TEXT="#000000" | |
25 LINK="#0000ee" | |
26 VLINK="#551a8b" | |
27 ALINK="#ff0000" | |
28 ><DIV | |
29 CLASS="NAVHEADER" | |
30 ><TABLE | |
31 WIDTH="100%" | |
32 BORDER="0" | |
33 CELLPADDING="0" | |
34 CELLSPACING="0" | |
35 ><TR | |
36 ><TH | |
37 COLSPAN="3" | |
38 ALIGN="center" | |
39 >SDL Library Documentation</TH | |
40 ></TR | |
41 ><TR | |
42 ><TD | |
43 WIDTH="10%" | |
44 ALIGN="left" | |
45 VALIGN="bottom" | |
46 ><A | |
47 HREF="sdlcondsignal.html" | |
48 >Prev</A | |
49 ></TD | |
50 ><TD | |
51 WIDTH="80%" | |
52 ALIGN="center" | |
53 VALIGN="bottom" | |
54 ></TD | |
55 ><TD | |
56 WIDTH="10%" | |
57 ALIGN="right" | |
58 VALIGN="bottom" | |
59 ><A | |
60 HREF="sdlcondwait.html" | |
61 >Next</A | |
62 ></TD | |
63 ></TR | |
64 ></TABLE | |
65 ><HR | |
66 ALIGN="LEFT" | |
67 WIDTH="100%"></DIV | |
68 ><H1 | |
69 ><A | |
70 NAME="SDLCONDBROADCAST" | |
71 >SDL_CondBroadcast</A | |
72 ></H1 | |
73 ><DIV | |
74 CLASS="REFNAMEDIV" | |
75 ><A | |
181
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76 NAME="AEN7949" |
0 | 77 ></A |
78 ><H2 | |
79 >Name</H2 | |
80 >SDL_CondBroadcast -- Restart all threads waiting on a condition variable</DIV | |
81 ><DIV | |
82 CLASS="REFSYNOPSISDIV" | |
83 ><A | |
181
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84 NAME="AEN7952" |
0 | 85 ></A |
86 ><H2 | |
87 >Synopsis</H2 | |
88 ><DIV | |
89 CLASS="FUNCSYNOPSIS" | |
90 ><A | |
181
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91 NAME="AEN7953" |
0 | 92 ></A |
93 ><P | |
94 ></P | |
95 ><PRE | |
96 CLASS="FUNCSYNOPSISINFO" | |
97 >#include "SDL.h" | |
98 #include "SDL_thread.h"</PRE | |
99 ><P | |
100 ><CODE | |
101 ><CODE | |
102 CLASS="FUNCDEF" | |
103 >int <B | |
104 CLASS="FSFUNC" | |
105 >SDL_CondBroadcast</B | |
106 ></CODE | |
107 >(SDL_cond *cond);</CODE | |
108 ></P | |
109 ><P | |
110 ></P | |
111 ></DIV | |
112 ></DIV | |
113 ><DIV | |
114 CLASS="REFSECT1" | |
115 ><A | |
181
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116 NAME="AEN7959" |
0 | 117 ></A |
118 ><H2 | |
119 >Description</H2 | |
120 ><P | |
121 >Restarts all threads that are waiting on the condition variable, <TT | |
122 CLASS="PARAMETER" | |
123 ><I | |
124 >cond</I | |
125 ></TT | |
126 >. Returns <SPAN | |
127 CLASS="RETURNVALUE" | |
128 >0</SPAN | |
129 > on success, or <SPAN | |
130 CLASS="RETURNVALUE" | |
131 >-1</SPAN | |
132 > on an error.</P | |
133 ></DIV | |
134 ><DIV | |
135 CLASS="REFSECT1" | |
136 ><A | |
181
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137 NAME="AEN7965" |
0 | 138 ></A |
139 ><H2 | |
140 >See Also</H2 | |
141 ><P | |
142 ><A | |
143 HREF="sdlcondsignal.html" | |
144 ><TT | |
145 CLASS="FUNCTION" | |
146 >SDL_CondSignal</TT | |
147 ></A | |
148 >, | |
149 <A | |
150 HREF="sdlcondwait.html" | |
151 ><TT | |
152 CLASS="FUNCTION" | |
153 >SDL_CondWait</TT | |
154 ></A | |
155 > </P | |
156 ></DIV | |
157 ><DIV | |
158 CLASS="NAVFOOTER" | |
159 ><HR | |
160 ALIGN="LEFT" | |
161 WIDTH="100%"><TABLE | |
162 WIDTH="100%" | |
163 BORDER="0" | |
164 CELLPADDING="0" | |
165 CELLSPACING="0" | |
166 ><TR | |
167 ><TD | |
168 WIDTH="33%" | |
169 ALIGN="left" | |
170 VALIGN="top" | |
171 ><A | |
172 HREF="sdlcondsignal.html" | |
173 >Prev</A | |
174 ></TD | |
175 ><TD | |
176 WIDTH="34%" | |
177 ALIGN="center" | |
178 VALIGN="top" | |
179 ><A | |
180 HREF="index.html" | |
181 >Home</A | |
182 ></TD | |
183 ><TD | |
184 WIDTH="33%" | |
185 ALIGN="right" | |
186 VALIGN="top" | |
187 ><A | |
188 HREF="sdlcondwait.html" | |
189 >Next</A | |
190 ></TD | |
191 ></TR | |
192 ><TR | |
193 ><TD | |
194 WIDTH="33%" | |
195 ALIGN="left" | |
196 VALIGN="top" | |
197 >SDL_CondSignal</TD | |
198 ><TD | |
199 WIDTH="34%" | |
200 ALIGN="center" | |
201 VALIGN="top" | |
202 ><A | |
203 HREF="thread.html" | |
204 >Up</A | |
205 ></TD | |
206 ><TD | |
207 WIDTH="33%" | |
208 ALIGN="right" | |
209 VALIGN="top" | |
210 >SDL_CondWait</TD | |
211 ></TR | |
212 ></TABLE | |
213 ></DIV | |
214 ></BODY | |
215 ></HTML | |
216 > |