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28<h2><span class="refentrytitle">Class recursive_timed_mutex</span></h2>
29<p>boost::recursive_timed_mutex &#8212; <p>The <a href="recursive_timed_mutex.html" title="Class recursive_timed_mutex">recursive_timed_mutex</a> class is a model of the
30                        <a href="threads/concepts.html#threads.concepts.TimedMutex" title="TimedMutex Concept">TimedMutex</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_timed_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  <span class="bold"><strong>typedef</strong></span> <span class="emphasis"><em>implementation-defined</em></span> scoped_try_lock;  
40  <span class="bold"><strong>typedef</strong></span> <span class="emphasis"><em>implementation-defined</em></span> scoped_timed_lock;
41
42  <span class="emphasis"><em>// <a href="recursive_timed_mutex.html#recursive_timed_mutexconstruct-copy-destruct">construct/copy/destruct</a></em></span>
43  <a href="recursive_timed_mutex.html#id2374121-bb">recursive_timed_mutex</a>();
44  <a href="recursive_timed_mutex.html#id2485567-bb">~recursive_timed_mutex</a>();
45};</pre></div>
46<div class="refsect1" lang="en">
47<a name="id2783326"></a><h2>Description</h2>
48<p>The <a href="recursive_timed_mutex.html" title="Class recursive_timed_mutex">recursive_timed_mutex</a> class is a model of the
49                        <a href="threads/concepts.html#threads.concepts.TimedMutex" title="TimedMutex Concept">TimedMutex</a> concept.
50                        It should be used to synchronize access to shared resources using
51                        <a href="threads/concepts.html#threads.concepts.recursive-locking-strategy" title="Recursive Locking Strategy">Recursive</a>
52                        locking mechanics.</p>
53<p>For classes that model related mutex concepts, see
54                        <a href="recursive_mutex.html" title="Class recursive_mutex">recursive_mutex</a> and <a href="recursive_try_mutex.html" title="Class recursive_try_mutex">recursive_try_mutex</a>.</p>
55<p>For <a href="threads/concepts.html#threads.concepts.unspecified-locking-strategy" title="Unspecified Locking Strategy">Unspecified</a>
56                        locking mechanics, see <a href="mutex.html" title="Class mutex">mutex</a>,
57                        <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>.
58                        </p>
59<p>The <a href="recursive_timed_mutex.html" title="Class recursive_timed_mutex">recursive_timed_mutex</a> class supplies the following typedefs,
60                        which model the specified locking strategies:
61
62                        </p>
63<div class="table">
64<a name="id2783417"></a><p class="title"><b>Table 12.14. Supported Lock Types</b></p>
65<table class="table" summary="Supported Lock Types">
66<colgroup>
67<col>
68<col>
69</colgroup>
70<thead><tr>
71<th align="left">Lock Name</th>
72<th align="left">Lock Concept</th>
73</tr></thead>
74<tbody>
75<tr>
76<td align="left">scoped_lock</td>
77<td align="left"><a href="threads/concepts.html#threads.concepts.ScopedLock" title="ScopedLock Concept">ScopedLock</a></td>
78</tr>
79<tr>
80<td align="left">scoped_try_lock</td>
81<td align="left"><a href="threads/concepts.html#threads.concepts.ScopedTryLock" title="ScopedTryLock Concept">ScopedTryLock</a></td>
82</tr>
83<tr>
84<td align="left">scoped_timed_lock</td>
85<td align="left"><a href="threads/concepts.html#threads.concepts.ScopedTimedLock" title="ScopedTimedLock Concept">ScopedTimedLock</a></td>
86</tr>
87</tbody>
88</table>
89</div>
90<p>The <a href="recursive_timed_mutex.html" title="Class recursive_timed_mutex">recursive_timed_mutex</a> class uses a
91                        <a href="threads/concepts.html#threads.concepts.recursive-locking-strategy" title="Recursive Locking Strategy">Recursive</a>
92                        locking strategy, so attempts to recursively lock a
93                        <a href="recursive_timed_mutex.html" title="Class recursive_timed_mutex">recursive_timed_mutex</a> object
94                        succeed and an internal "lock count" is maintained.
95                        Attempts to unlock a <a href="recursive_mutex.html" title="Class recursive_mutex">recursive_mutex</a> object
96                        by threads that don't own a lock on it result in
97                        <span class="bold"><strong>undefined behavior</strong></span>.</p>
98<p>Like all
99                        <a href="threads/concepts.html#threads.concepts.mutex-models" title="Mutex Models">mutex models</a>
100                        in  <span class="bold"><strong>Boost.Threads</strong></span>, <a href="recursive_timed_mutex.html" title="Class recursive_timed_mutex">recursive_timed_mutex</a> leaves the
101                        <a href="threads/concepts.html#threads.concepts.sheduling-policies" title="Scheduling Policies">scheduling policy</a>
102                        as <a href="threads/concepts.html#threads.concepts.unspecified-scheduling-policy" title="Unspecified Policy">Unspecified</a>.
103                        Programmers should make no assumptions about the order in which
104                        waiting threads acquire a lock.</p>
105<div class="refsect2" lang="en">
106<a name="id2783553"></a><h3>
107<a name="recursive_timed_mutexconstruct-copy-destruct"></a><code class="computeroutput">recursive_timed_mutex</code> construct/copy/destruct</h3>
108<div class="orderedlist"><ol type="1">
109<li>
110<pre class="literallayout"><a name="id2374121-bb"></a>recursive_timed_mutex();</pre>
111<p><b xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision"><span class="term">Effects</span></b>:
112
113    Constructs a <a href="recursive_timed_mutex.html" title="Class recursive_timed_mutex">recursive_timed_mutex</a> object.
114                        <br><b xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision"><span class="term">Postconditions</span></b>:
115
116    <code class="computeroutput">*this</code> is in an unlocked state.
117                        </p>
118</li>
119<li>
120<pre class="literallayout"><a name="id2485567-bb"></a>~recursive_timed_mutex();</pre>
121<p><b xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision"><span class="term">Effects</span></b>:
122
123    Destroys a <a href="recursive_timed_mutex.html" title="Class recursive_timed_mutex">recursive_timed_mutex</a> object.<br><b xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision"><span class="term">Requires</span></b>:
124
125    <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>:
126
127    <span class="bold"><strong>Danger:</strong></span> Destruction of a
128                        locked mutex is a serious programming error resulting in undefined
129                        behavior such as a program crash.</p>
130</li>
131</ol></div>
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137<td align="right"><small>Copyright © 2001-2003 William E. Kempf</small></td>
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