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<title>Issue 967: Various threading bugs #17</title>
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<p><em>This page is a snapshot from the LWG issues list, see the <a href="lwg-active.html">Library Active Issues List</a> for more information and the meaning of <a href="lwg-active.html#C++11">C++11</a> status.</em></p>
<h3 id="967"><a href="lwg-defects.html#967">967</a>. Various threading bugs #17</h3>
<p><b>Section:</b> 32.4.3.3 <a href="https://wg21.link/thread.thread.constr">[thread.thread.constr]</a> <b>Status:</b> <a href="lwg-active.html#C++11">C++11</a>
 <b>Submitter:</b> Pete Becker <b>Opened:</b> 2009-01-07 <b>Last modified:</b> 2016-01-28</p>
<p><b>Priority: </b>Not Prioritized
</p>
<p><b>View other</b> <a href="lwg-index-open.html#thread.thread.constr">active issues</a> in [thread.thread.constr].</p>
<p><b>View all other</b> <a href="lwg-index.html#thread.thread.constr">issues</a> in [thread.thread.constr].</p>
<p><b>View all issues with</b> <a href="lwg-status.html#C++11">C++11</a> status.</p>
<p><b>Discussion:</b></p>
<p>
the error handling for the constructor for <code>condition_variable</code>
distinguishes lack of memory from lack of other resources, but the error
handling for the thread constructor does not. Is this difference
intentional?
</p>

<p><i>[
Beman has volunteered to provide proposed wording.
]</i></p>


<p><i>[
2009-09-25 Beman provided proposed wording.
]</i></p>


<blockquote><p>
The proposed resolution assumes <a href="lwg-defects.html#962" title="Various threading bugs #12 (Status: C++11)">962</a><sup><a href="https://cplusplus.github.io/LWG/issue962" title="Latest snapshot">(i)</a></sup> has been accepted and
its proposed resolution applied to the working paper.
</p></blockquote>

<p><i>[
2009-10 Santa Cruz:
]</i></p>


<blockquote><p>
Move to Ready.
</p></blockquote>



<p id="res-967"><b>Proposed resolution:</b></p>


<p><span style="font-style: italic">Change Mutex requirements 32.6.4 <a href="https://wg21.link/thread.mutex.requirements">[thread.mutex.requirements]</a>, 
paragraph 4, as indicated:</span></p>
<blockquote>

<p><i>Error conditions:</i></p>
  <blockquote>

<ul>
<li><del> <code>not_enough_memory</code> &mdash; if there is not enough memory to construct 
the mutex object.</del></li>

<li><code>resource_unavailable_try_again</code> &mdash; if any native handle type 
manipulated is not available.</li>

<li><code>operation_not_permitted</code> &mdash; if the thread does not have the 
necessary permission to change the state of the mutex object.</li>

<li><code>device_or_resource_busy</code> &mdash; if any native handle type 
manipulated is already locked.</li>

<li><code>invalid_argument</code> &mdash; if any native handle type manipulated as 
part of mutex construction is incorrect.</li>
</ul>
  </blockquote>
</blockquote>

<p><span style="font-style: italic">Change Class <code>condition_variable</code> 32.7.4 <a href="https://wg21.link/thread.condition.condvar">[thread.condition.condvar]</a>, 
default constructor, as indicated:</span></p>
<blockquote>
  <p><code>condition_variable();</code></p>
  <blockquote>
    <p><i>Effects:</i> Constructs an object of type <code>condition_variable</code>.</p>
    <p><ins><i>Throws:</i> <code>std::system_error</code> when an exception is required (32.2.2 <a href="https://wg21.link/thread.req.exception">[thread.req.exception]</a>)</ins>.</p>
    <p><i>Error conditions:</i></p>
    <blockquote>
    <ul>
      <li><del><code>not_enough_memory</code> &mdash; if a memory limitation prevents 
      initialization.</del></li>
      <li> <code>resource_unavailable_try_again</code> &mdash; if some non-memory 
      resource limitation prevents initialization.</li>
      <li> <code>device_or_resource_busy</code> &mdash; if attempting to initialize a 
      previously-initialized but as of yet undestroyed <code>condition_variable</code>.</li>
    </ul>
    </blockquote>
  </blockquote>
</blockquote>





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