📄 libs87.htm
字号:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<meta name="GENERATOR" content="Quadralay WebWorks Publisher Professional Edition 6.0.5">
<meta name="TEMPLATEBASE" content="book_html">
<meta name="LASTUPDATED" content="12/01/03 14:15:58">
<title>mutex_release</title>
<STYLE TYPE="text/css">
<!--
span.Signal { text-transform: uppercase; font-family: Verdana }
-->
</STYLE>
</head>
<body link="#3366CC" vlink="#9999CC" text="#000000" alink="#0000CC" bgcolor="#FFFFFF"
background="images/backgrnd.gif">
<p><img src="images/stlogo.gif" width="106" height="83" align="left"
alt="logo here!"> </p>
<table width="331" border="0" align="right" cellpadding="0" cellspacing="0">
<tr>
<td><a href="os20toc.htm"><img src="images/navtoc.gif" width="84" height="23"
border="0" alt="TOC"> </a></td>
<td><a href="libs86.htm"><img src="images/navprev.gif" width="80" height="23"
border="0" alt="PREV"> </a></td>
<td><a href="libs88.htm"><img src="images/navnext.gif" width="83" height="23"
border="0" alt="NEXT"> </a></td>
<td><a href="os20ix.htm"><img src="images/navidx.gif" width="84" height="23"
border="0" alt="INDEX"> </a></td>
</tr>
</table>
<p><br clear="all">
</p>
<hr align="left">
<blockquote>
<h2>
<a name="1273397"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">mutex_release</font>
</h2><hr>
<p>
<a name="1273398"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Release a mutex</font>
</p>
<h3>
<a name="1273399"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Synopsis</font>
</h3>
<a name="1273400"> </a><font size=2 face=Courier><strong>#include <mutex.h><br></strong></font>
<a name="1273401"> </a><font size=2 face=Courier><strong>int mutex_release(mutex_t* mutex);<br></strong></font>
<h3>
<a name="1273402"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Arguments</font>
</h3>
<p>
<a name="1273403"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b><font size=2 face=Courier><strong>mutex_t* mutex</strong></font></b></font>
<br>
<dl><dl> <dl>
<dt> <a name="1273404"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">A pointer to a mutex to release</font>
</dl>
</dl></dl>
<h3>
<a name="1273405"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Results</font>
</h3>
<p>
<a name="1273406"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Returns 0 on success, -1 if an error occurs.</font>
</p>
<h3>
<a name="1273407"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Errors</font>
</h3>
<p>
<a name="1273408"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Returns -1 if the task releasing the mutex does not own it.</font>
</p>
<h3>
<a name="1273411"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Description</font>
</h3>
<p>
<a name="1273412"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><font size=2 face=Courier><strong>mutex_release()</strong></font> releases the specified mutex. The exact behavior of this function depends on the mutex type. The operation checks the queue of tasks waiting for the mutex, if the list is not empty, then the first task on the list is restarted and granted ownership of the mutex, possibly preempting the current task. Otherwise the mutex is released, and the task continues running.</font>
</p>
<p>
<a name="1273413"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">If the releasing task had its priority temporarily boosted by the priority inversion logic, then once the mutex is released the task's priority is returned to its correct value.</font>
</p>
<p>
<a name="1273421"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Once the task has released the mutex, it is made mortal again.</font>
</p>
<h3>
<a name="1273593"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Callable from</font>
</h3>
<p>
<a name="1273594"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Tasks only</font>
</p>
<h3>
<a name="1273422"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">See also</font>
</h3>
<p>
<a name="1273423"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><a href="libs86.htm#1273372"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>mutex_lock</i></font></a>, <a href="libs88.htm#1273432"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>mutex_trylock</i></font></a>, <a href="libs124.htm#1209347"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>task_mortal</i></font></a> </font>
</p>
</blockquote>
<hr>
<table width="331" border="0" align="left" cellpadding="0" cellspacing="0">
<tr>
<td><a href="os20toc.htm"><img src="images/navtoc.gif" width="84" height="23"
border="0" alt="TOC"> </a></td>
<td><a href="libs86.htm"><img src="images/navprev.gif" width="80" height="23"
border="0" alt="PREV"> </a></td>
<td><a href="libs88.htm"><img src="images/navnext.gif" width="83" height="23"
border="0" alt="NEXT"> </a></td>
<td><a href="os20ix.htm"><img src="images/navidx.gif" width="84" height="23"
border="0" alt="INDEX"> </a></td>
</tr>
</table>
<font size=1 face="Verdana, Arial, Helvetica, sans-serif"> © 2001, 2002, 2003 STMicroelectronics. All Rights Reserved.<br>
ADCS 7473749B</font>
</body>
</html>
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -