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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>schedule_timeout</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /><link rel="home" href="index.html" title="Linux Device Drivers" /><link rel="up" href="ch01s03.html" title="Delaying, scheduling, and timer routines" /><link rel="prev" href="API-del-timer-sync.html" title="del_timer_sync" /><link rel="next" href="API-msleep.html" title="msleep" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">schedule_timeout</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-del-timer-sync.html">Prev</a>&#160;</td><th width="60%" align="center">Delaying, scheduling, and timer routines</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-msleep.html">Next</a></td></tr></table><hr /></div><div class="refentry"><a id="API-schedule-timeout"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>schedule_timeout &#8212; 
     sleep until timeout
 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">signed long __sched <strong class="fsfunc">schedule_timeout </strong>(</code></td><td>signed long <var class="pdparam">timeout</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a id="idm140404968590096"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>timeout</code></em></span></dt><dd><p>
     timeout value in jiffies
    </p></dd></dl></div></div><div class="refsect1"><a id="idm140404968587040"></a><h2>Description</h2><p>
   Make the current task sleep until <em class="parameter"><code>timeout</code></em> jiffies have
   elapsed. The routine will return immediately unless
   the current task state has been set (see <code class="function">set_current_state</code>).
   </p><p>

   You can set the task state as follows -
   </p><p>

   <code class="constant">TASK_UNINTERRUPTIBLE</code> - at least <em class="parameter"><code>timeout</code></em> jiffies are guaranteed to
   pass before the routine returns. The routine will return 0
   </p><p>

   <code class="constant">TASK_INTERRUPTIBLE</code> - the routine may return early if a signal is
   delivered to the current task. In this case the remaining time
   in jiffies will be returned, or 0 if the timer expired in time
   </p><p>

   The current task state is guaranteed to be TASK_RUNNING when this
   routine returns.
   </p><p>

   Specifying a <em class="parameter"><code>timeout</code></em> value of <code class="constant">MAX_SCHEDULE_TIMEOUT</code> will schedule
   the CPU away without a bound on the timeout. In this case the return
   value will be <code class="constant">MAX_SCHEDULE_TIMEOUT</code>.
   </p><p>

   In all cases the return value is guaranteed to be non-negative.
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