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Wed May 27 20:33:03 2009 UTC (10 years, 4 months ago) by Jede
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Ajouts des libs windows
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4 >SDL_CreateSemaphore</TITLE
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71 ><H1
72 ><A
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74 ></A
75 >SDL_CreateSemaphore</H1
76 ><DIV
77 CLASS="REFNAMEDIV"
78 ><A
79 NAME="AEN7936"
80 ></A
81 ><H2
82 >Name</H2
83 >SDL_CreateSemaphore&nbsp;--&nbsp;Creates a new semaphore and assigns an initial value to it.</DIV
84 ><DIV
85 CLASS="REFSYNOPSISDIV"
86 ><A
87 NAME="AEN7939"
88 ></A
89 ><H2
90 >Synopsis</H2
91 ><DIV
92 CLASS="FUNCSYNOPSIS"
93 ><A
94 NAME="AEN7940"
95 ></A
96 ><P
97 ></P
98 ><PRE
99 CLASS="FUNCSYNOPSISINFO"
100 >#include "SDL.h"
101 #include "SDL_thread.h"</PRE
102 ><P
103 ><CODE
104 ><CODE
105 CLASS="FUNCDEF"
106 >SDL_sem *<B
107 CLASS="FSFUNC"
108 >SDL_CreateSemaphore</B
109 ></CODE
110 >(Uint32 initial_value);</CODE
111 ></P
112 ><P
113 ></P
114 ></DIV
115 ></DIV
116 ><DIV
117 CLASS="REFSECT1"
118 ><A
119 NAME="AEN7946"
120 ></A
121 ><H2
122 >Description</H2
123 ><P
124 ><TT
125 CLASS="FUNCTION"
126 >SDL_CreateSemaphore()</TT
127 > creates a new semaphore and
128 initializes it with the value <TT
129 CLASS="PARAMETER"
130 ><I
131 >initial_value</I
132 ></TT
133 >.
134 Each locking operation on the semaphore by
135 <A
136 HREF="sdlsemwait.html"
137 >SDL_SemWait</A
138 >,
139 <A
140 HREF="sdlsemtrywait.html"
141 >SDL_SemTryWait</A
142 > or
143 <A
144 HREF="sdlsemwaittimeout.html"
145 >SDL_SemWaitTimeout</A
146 >
147 will atomically decrement the semaphore value. The locking operation will be blocked
148 if the semaphore value is not positive (greater than zero). Each unlock operation by
149 <A
150 HREF="sdlsempost.html"
151 >SDL_SemPost</A
152 >
153 will atomically increment the semaphore value.</P
154 ></DIV
155 ><DIV
156 CLASS="REFSECT1"
157 ><A
158 NAME="AEN7955"
159 ></A
160 ><H2
161 >Return Value</H2
162 ><P
163 >Returns a pointer to an initialized semaphore or
164 <SPAN
165 CLASS="RETURNVALUE"
166 >NULL</SPAN
167 > if there was an error.</P
168 ></DIV
169 ><DIV
170 CLASS="REFSECT1"
171 ><A
172 NAME="AEN7959"
173 ></A
174 ><H2
175 >Examples</H2
176 ><P
177 ><PRE
178 CLASS="PROGRAMLISTING"
179 >SDL_sem *my_sem;
180
181 my_sem = SDL_CreateSemaphore(INITIAL_SEM_VALUE);
182
183 if (my_sem == NULL) {
184 return CREATE_SEM_FAILED;
185 }</PRE
186 ></P
187 ></DIV
188 ><DIV
189 CLASS="REFSECT1"
190 ><A
191 NAME="AEN7963"
192 ></A
193 ><H2
194 >See Also</H2
195 ><P
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="sdlsempost.html"
226 ><TT
227 CLASS="FUNCTION"
228 >SDL_SemPost</TT
229 ></A
230 >,
231 <A
232 HREF="sdlsemvalue.html"
233 ><TT
234 CLASS="FUNCTION"
235 >SDL_SemValue</TT
236 ></A
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