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- <title>"SDL_SemWait"("3") manual page</title>
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- <a href='#toc'>Table of Contents</a><p>
-
- <h2><a name='sect0' href='#toc0'>Name</a></h2>
- SDL_SemWait- Lock a semaphore and suspend the thread if the semaphore
- value is zero.
- <h2><a name='sect1' href='#toc1'>Synopsis</a></h2>
- <p>
- <b>#include "SDL.h" #include "SDL_thread.h" <p>
- </b><b>int <b>SDL_SemWait</b></b>(<b>SDL_sem
- *sem</b>);
- <h2><a name='sect2' href='#toc2'>Description</a></h2>
- <p>
- <b>SDL_SemWait()</b> suspends the calling thread until either
- the semaphore pointed to by <b>sem</b> has a positive value, the call is interrupted
- by a signal or error. If the call is successful it will atomically decrement
- the semaphore value. <p>
- After <b>SDL_SemWait()</b> is successful, the semaphore can
- be released and its count atomically incremented by a successful call to
- <i>SDL_SemPost</i>.
- <h2><a name='sect3' href='#toc3'>Return Value</a></h2>
- <p>
- Returns <b>0</b> if successful or <b>-1</b> if there was an error
- (leaving the semaphore unchanged).
- <h2><a name='sect4' href='#toc4'>Examples</a></h2>
- <p>
- <p>
- <br>
- <pre>CWif (SDL_SemWait(my_sem) == -1) {
- return WAIT_FAILED;
- }
- ...
- SDL_SemPost(my_sem);
- </pre><p>
-
- <h2><a name='sect5' href='#toc5'>See Also</a></h2>
- <p>
- <i><b>SDL_CreateSemaphore</b></i>, <i><b>SDL_DestroySemaphore</b></i>, <i><b>SDL_SemTryWait</b></i>, <i><b>SDL_SemWaitTimeout</b></i>,
- <i><b>SDL_SemPost</b></i>, <i><b>SDL_SemValue</b></i>
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- <p>
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- <hr><p>
- <a name='toc'><b>Table of Contents</b></a><p>
- <ul>
- <li><a name='toc0' href='#sect0'>Name</a></li>
- <li><a name='toc1' href='#sect1'>Synopsis</a></li>
- <li><a name='toc2' href='#sect2'>Description</a></li>
- <li><a name='toc3' href='#sect3'>Return Value</a></li>
- <li><a name='toc4' href='#sect4'>Examples</a></li>
- <li><a name='toc5' href='#sect5'>See Also</a></li>
- </ul>
- </body>
- </html>
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