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authorCraig Jennings <c@cjennings.net>2025-08-14 22:58:58 -0500
committerCraig Jennings <c@cjennings.net>2025-08-14 22:58:58 -0500
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- <h1 id="firstHeading" class="firstHeading">cnd_timedwait</h1> <table class="t-dcl-begin"> <tr class="t-dsc-header"> <th> Defined in header <code>&lt;threads.h&gt;</code> </th> <th> </th> <th> </th> </tr> <tr class="t-dcl t-since-c11"> <td> <pre data-language="c">int cnd_timedwait( cnd_t* restrict cond, mtx_t* restrict mutex,
- const struct timespec* restrict time_point );</pre>
-</td> <td class="t-dcl-nopad"> </td> <td> <span class="t-mark-rev t-since-c11">(since C11)</span> </td> </tr> </table> <p>Atomically unlocks the mutex pointed to by <code>mutex</code> and blocks on the condition variable pointed to by <code>cond</code> until the thread is signalled by <code><a href="cnd_signal" title="c/thread/cnd signal">cnd_signal</a></code> or <code><a href="cnd_broadcast" title="c/thread/cnd broadcast">cnd_broadcast</a></code>, or until the <code>TIME_UTC</code> based time point pointed to by <code>time_point</code> has been reached, or until a spurious wake-up occurs. The mutex is locked again before the function returns.</p>
-<p>The behavior is undefined if the mutex is not already locked by the calling thread.</p>
-<h3 id="Parameters"> Parameters</h3> <table class="t-par-begin"> <tr class="t-par"> <td> cond </td> <td> - </td> <td> pointer to the condition variable to block on </td>
-</tr> <tr class="t-par"> <td> mutex </td> <td> - </td> <td> pointer to the mutex to unlock for the duration of the block </td>
-</tr> <tr class="t-par"> <td> time_point </td> <td> - </td> <td> pointer to an object specifying timeout time to wait until </td>
-</tr>
-</table> <h3 id="Return_value"> Return value</h3> <p><code><a href="thrd_errors" title="c/thread/thrd errors">thrd_success</a></code> if successful, <code>thrd_timedout</code> if the timeout time has been reached before the mutex is locked, or <code><a href="thrd_errors" title="c/thread/thrd errors">thrd_error</a></code> if an error occurred.</p>
-<h3 id="References"> References</h3> <ul>
-<li> C17 standard (ISO/IEC 9899:2018): </li>
-<ul><li> 7.26.3.5 The cnd_timedwait function (p: 276-277) </li></ul>
-<li> C11 standard (ISO/IEC 9899:2011): </li>
-<ul><li> 7.26.3.5 The cnd_timedwait function (p: 379-380) </li></ul>
-</ul> <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="cnd_wait" title="c/thread/cnd wait"> <span class="t-lines"><span>cnd_wait</span></span></a></div>
-<div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div> </td> <td> blocks on a condition variable <br> <span class="t-mark">(function)</span> </td>
-</tr> <tr class="t-dsc"> <td colspan="2"> <span><a href="https://en.cppreference.com/w/cpp/thread/condition_variable/wait_until" title="cpp/thread/condition variable/wait until">C++ documentation</a></span> for <code>condition_variable::wait_until</code> </td>
-</tr> <tr class="t-dsc"> <td colspan="2"> <span><a href="https://en.cppreference.com/w/cpp/thread/condition_variable_any/wait_until" title="cpp/thread/condition variable any/wait until">C++ documentation</a></span> for <code>condition_variable_any::wait_until</code> </td>
-</tr> </table> <div class="_attribution">
- <p class="_attribution-p">
- &copy; cppreference.com<br>Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.<br>
- <a href="https://en.cppreference.com/w/c/thread/cnd_timedwait" class="_attribution-link">https://en.cppreference.com/w/c/thread/cnd_timedwait</a>
- </p>
-</div>