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26<a name="recursive_mutex"></a><div class="titlepage"></div>
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28<h2><span class="refentrytitle">Class recursive_mutex</span></h2>
29<p>boost::recursive_mutex &#8212; <p>The <a href="recursive_mutex.html" title="Class recursive_mutex">recursive_mutex</a> class is a model of the
30                        <a href="threads/concepts.html#threads.concepts.Mutex" title="Mutex Concept">Mutex</a> concept.</p></p>
31</div>
32<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
33<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis">
34<span class="bold"><strong>class</strong></span> recursive_mutex : <span class="bold"><strong>private</strong></span> boost::noncopyable   <span class="emphasis"><em>// Exposition only</em></span>
35{
36<span class="bold"><strong>public</strong></span>:
37  <span class="emphasis"><em>// types</em></span>
38  <span class="bold"><strong>typedef</strong></span> <span class="emphasis"><em>implementation-defined</em></span> scoped_lock;
39
40  <span class="emphasis"><em>// <a href="recursive_mutex.html#recursive_mutexconstruct-copy-destruct">construct/copy/destruct</a></em></span>
41  <a href="recursive_mutex.html#id2596976-bb">recursive_mutex</a>();
42  <a href="recursive_mutex.html#id2575603-bb">~recursive_mutex</a>();
43};</pre></div>
44<div class="refsect1" lang="en">
45<a name="id2782436"></a><h2>Description</h2>
46<p>The <a href="recursive_mutex.html" title="Class recursive_mutex">recursive_mutex</a> class is a model of the
47                        <a href="threads/concepts.html#threads.concepts.Mutex" title="Mutex Concept">Mutex</a> concept.
48                        It should be used to synchronize access to shared resources using
49                        <a href="threads/concepts.html#threads.concepts.recursive-locking-strategy" title="Recursive Locking Strategy">Recursive</a>
50                        locking mechanics.</p>
51<p>For classes that model related mutex concepts, see
52                        <a href="recursive_try_mutex.html" title="Class recursive_try_mutex">recursive_try_mutex</a> and <a href="recursive_timed_mutex.html" title="Class recursive_timed_mutex">recursive_timed_mutex</a>.</p>
53<p>For <a href="threads/concepts.html#threads.concepts.unspecified-locking-strategy" title="Unspecified Locking Strategy">Unspecified</a>
54                        locking mechanics, see <a href="mutex.html" title="Class mutex">mutex</a>,
55                        <a href="try_mutex.html" title="Class try_mutex">try_mutex</a>, and <a href="timed_mutex.html" title="Class timed_mutex">timed_mutex</a>.
56                        </p>
57<p>The <a href="recursive_mutex.html" title="Class recursive_mutex">recursive_mutex</a> class supplies the following typedef,
58                        which models the specified locking strategy:
59
60                        </p>
61<div class="table">
62<a name="id2782528"></a><p class="title"><b>Table 12.12. Supported Lock Types</b></p>
63<table class="table" summary="Supported Lock Types">
64<colgroup>
65<col>
66<col>
67</colgroup>
68<thead><tr>
69<th align="left">Lock Name</th>
70<th align="left">Lock Concept</th>
71</tr></thead>
72<tbody><tr>
73<td align="left">scoped_lock</td>
74<td align="left"><a href="threads/concepts.html#threads.concepts.ScopedLock" title="ScopedLock Concept">ScopedLock</a></td>
75</tr></tbody>
76</table>
77</div>
78<p>The <a href="recursive_mutex.html" title="Class recursive_mutex">recursive_mutex</a> class uses a
79                        <a href="threads/concepts.html#threads.concepts.recursive-locking-strategy" title="Recursive Locking Strategy">Recursive</a>
80                        locking strategy, so attempts to recursively lock a
81                        <a href="recursive_mutex.html" title="Class recursive_mutex">recursive_mutex</a> object
82                        succeed and an internal "lock count" is maintained.
83                        Attempts to unlock a <a href="recursive_mutex.html" title="Class recursive_mutex">recursive_mutex</a> object
84                        by threads that don't own a lock on it result in
85                        <span class="bold"><strong>undefined behavior</strong></span>.</p>
86<p>Like all
87                        <a href="threads/concepts.html#threads.concepts.mutex-models" title="Mutex Models">mutex models</a>
88                        in <span class="bold"><strong>Boost.Threads</strong></span>, <a href="recursive_mutex.html" title="Class recursive_mutex">recursive_mutex</a> leaves the
89                        <a href="threads/concepts.html#threads.concepts.sheduling-policies" title="Scheduling Policies">scheduling policy</a>
90                        as <a href="threads/concepts.html#threads.concepts.unspecified-scheduling-policy" title="Unspecified Policy">Unspecified</a>.
91                        Programmers should make no assumptions about the order in which
92                        waiting threads acquire a lock.</p>
93<div class="refsect2" lang="en">
94<a name="id2782641"></a><h3>
95<a name="recursive_mutexconstruct-copy-destruct"></a><code class="computeroutput">recursive_mutex</code> construct/copy/destruct</h3>
96<div class="orderedlist"><ol type="1">
97<li>
98<pre class="literallayout"><a name="id2596976-bb"></a>recursive_mutex();</pre>
99<p><b xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision"><span class="term">Effects</span></b>:
100
101    Constructs a <a href="recursive_mutex.html" title="Class recursive_mutex">recursive_mutex</a> object.
102                        <br><b xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision"><span class="term">Postconditions</span></b>:
103
104    <code class="computeroutput">*this</code> is in an unlocked state.
105                        </p>
106</li>
107<li>
108<pre class="literallayout"><a name="id2575603-bb"></a>~recursive_mutex();</pre>
109<p><b xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision"><span class="term">Effects</span></b>:
110
111    Destroys a <a href="recursive_mutex.html" title="Class recursive_mutex">recursive_mutex</a> object.<br><b xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision"><span class="term">Requires</span></b>:
112
113    <code class="computeroutput">*this</code> is in an unlocked state.<br><b xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision"><span class="term">Notes</span></b>:
114
115    <span class="bold"><strong>Danger:</strong></span> Destruction of a
116                        locked mutex is a serious programming error resulting in undefined
117                        behavior such as a program crash.</p>
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