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- <title>"SDL_CreateSemaphore"("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_CreateSemaphore- Creates a new semaphore and assigns an initial
- value to it.
- <h2><a name='sect1' href='#toc1'>Synopsis</a></h2>
- <p>
- <b>#include "SDL.h" #include "SDL_thread.h" <p>
- </b><b>SDL_sem *<b>SDL_CreateSemaphore</b></b>(<b>Uint32
- initial_value</b>);
- <h2><a name='sect2' href='#toc2'>Description</a></h2>
- <p>
- <b>SDL_CreateSemaphore()</b> creates a new semaphore
- and initializes it with the value <b>initial_value</b>. Each locking operation
- on the semaphore by <i>SDL_SemWait</i>, <i>SDL_SemTryWait</i> or <i>SDL_SemWaitTimeout</i> will
- atomically decrement the semaphore value. The locking operation will be
- blocked if the semaphore value is not positive (greater than zero). Each
- unlock operation by <i>SDL_SemPost</i> will atomically increment the semaphore
- value.
- <h2><a name='sect3' href='#toc3'>Return Value</a></h2>
- <p>
- Returns a pointer to an initialized semaphore or <b>NULL</b>
- if there was an error.
- <h2><a name='sect4' href='#toc4'>Examples</a></h2>
- <p>
- <p>
- <br>
- <pre>CWSDL_sem *my_sem;
- my_sem = SDL_CreateSemaphore(INITIAL_SEM_VALUE);
- if (my_sem == NULL) {
- return CREATE_SEM_FAILED;
- }
- </pre><p>
-
- <h2><a name='sect5' href='#toc5'>See Also</a></h2>
- <p>
- <i><b>SDL_DestroySemaphore</b></i>, <i><b>SDL_SemWait</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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