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Initial revision
author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
parents
children 55f1f1b3e27d
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-1:000000000000 0:74212992fb08
1 <HTML
2 ><HEAD
3 ><TITLE
4 >SDL_SemPost</TITLE
5 ><META
6 NAME="GENERATOR"
7 CONTENT="Modular DocBook HTML Stylesheet Version 1.61
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_SemWaitTimeout"
17 HREF="sdlsemwaittimeout.html"><LINK
18 REL="NEXT"
19 TITLE="SDL_SemValue"
20 HREF="sdlsemvalue.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="sdlsemwaittimeout.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="sdlsemvalue.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="SDLSEMPOST"
71 >SDL_SemPost</A
72 ></H1
73 ><DIV
74 CLASS="REFNAMEDIV"
75 ><A
76 NAME="AEN7545"
77 ></A
78 ><H2
79 >Name</H2
80 >SDL_SemPost&nbsp;--&nbsp;Unlock a semaphore.</DIV
81 ><DIV
82 CLASS="REFSYNOPSISDIV"
83 ><A
84 NAME="AEN7548"
85 ></A
86 ><H2
87 >Synopsis</H2
88 ><DIV
89 CLASS="FUNCSYNOPSIS"
90 ><A
91 NAME="AEN7549"
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_SemPost</B
106 ></CODE
107 >(SDL_sem *sem);</CODE
108 ></P
109 ><P
110 ></P
111 ></DIV
112 ></DIV
113 ><DIV
114 CLASS="REFSECT1"
115 ><A
116 NAME="AEN7555"
117 ></A
118 ><H2
119 >Description</H2
120 ><P
121 ><TT
122 CLASS="FUNCTION"
123 >SDL_SemPost</TT
124 > unlocks the semaphore pointed to by
125 <TT
126 CLASS="PARAMETER"
127 ><I
128 >sem</I
129 ></TT
130 > and atomically increments the semaphores value.
131 Threads that were blocking on the semaphore may be scheduled after this call
132 succeeds.</P
133 ><P
134 ><TT
135 CLASS="FUNCTION"
136 >SDL_SemPost</TT
137 > should be called after a semaphore is locked by a successful call to
138 <A
139 HREF="sdlsemwait.html"
140 >SDL_SemWait</A
141 >,
142 <A
143 HREF="sdlsemtrywait.html"
144 >SDL_SemTryWait</A
145 > or
146 <A
147 HREF="sdlsemwaittimeout.html"
148 >SDL_SemWaitTimeout</A
149 >.</P
150 ></DIV
151 ><DIV
152 CLASS="REFSECT1"
153 ><A
154 NAME="AEN7565"
155 ></A
156 ><H2
157 >Return Value</H2
158 ><P
159 >Returns <SPAN
160 CLASS="RETURNVALUE"
161 >0</SPAN
162 > if successful or
163 <SPAN
164 CLASS="RETURNVALUE"
165 >-1</SPAN
166 > if there was an error (leaving the semaphore unchanged).</P
167 ></DIV
168 ><DIV
169 CLASS="REFSECT1"
170 ><A
171 NAME="AEN7570"
172 ></A
173 ><H2
174 >Examples</H2
175 ><P
176 ><PRE
177 CLASS="PROGRAMLISTING"
178 >SDL_SemPost(my_sem);</PRE
179 ></P
180 ></DIV
181 ><DIV
182 CLASS="REFSECT1"
183 ><A
184 NAME="AEN7574"
185 ></A
186 ><H2
187 >See Also</H2
188 ><P
189 ><A
190 HREF="sdlcreatesemaphore.html"
191 ><TT
192 CLASS="FUNCTION"
193 >SDL_CreateSemaphore</TT
194 ></A
195 >,
196 <A
197 HREF="sdldestroysemaphore.html"
198 ><TT
199 CLASS="FUNCTION"
200 >SDL_DestroySemaphore</TT
201 ></A
202 >,
203 <A
204 HREF="sdlsemwait.html"
205 ><TT
206 CLASS="FUNCTION"
207 >SDL_SemWait</TT
208 ></A
209 >,
210 <A
211 HREF="sdlsemtrywait.html"
212 ><TT
213 CLASS="FUNCTION"
214 >SDL_SemTryWait</TT
215 ></A
216 >,
217 <A
218 HREF="sdlsemwaittimeout.html"
219 ><TT
220 CLASS="FUNCTION"
221 >SDL_SemWaitTimeout</TT
222 ></A
223 >,
224 <A
225 HREF="sdlsemvalue.html"
226 ><TT
227 CLASS="FUNCTION"
228 >SDL_SemValue</TT
229 ></A
230 ></P
231 ></DIV
232 ><DIV
233 CLASS="NAVFOOTER"
234 ><HR
235 ALIGN="LEFT"
236 WIDTH="100%"><TABLE
237 WIDTH="100%"
238 BORDER="0"
239 CELLPADDING="0"
240 CELLSPACING="0"
241 ><TR
242 ><TD
243 WIDTH="33%"
244 ALIGN="left"
245 VALIGN="top"
246 ><A
247 HREF="sdlsemwaittimeout.html"
248 >Prev</A
249 ></TD
250 ><TD
251 WIDTH="34%"
252 ALIGN="center"
253 VALIGN="top"
254 ><A
255 HREF="index.html"
256 >Home</A
257 ></TD
258 ><TD
259 WIDTH="33%"
260 ALIGN="right"
261 VALIGN="top"
262 ><A
263 HREF="sdlsemvalue.html"
264 >Next</A
265 ></TD
266 ></TR
267 ><TR
268 ><TD
269 WIDTH="33%"
270 ALIGN="left"
271 VALIGN="top"
272 >SDL_SemWaitTimeout</TD
273 ><TD
274 WIDTH="34%"
275 ALIGN="center"
276 VALIGN="top"
277 ><A
278 HREF="thread.html"
279 >Up</A
280 ></TD
281 ><TD
282 WIDTH="33%"
283 ALIGN="right"
284 VALIGN="top"
285 >SDL_SemValue</TD
286 ></TR
287 ></TABLE
288 ></DIV
289 ></BODY
290 ></HTML
291 >