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<li class="navelem"><a class="el" href="namespaceCgu.html">Cgu</a></li><li class="navelem"><a class="el" href="namespaceCgu_1_1Thread.html">Thread</a></li><li class="navelem"><a class="el" href="classCgu_1_1Thread_1_1Mutex.html">Mutex</a></li><li class="navelem"><a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html">Lock</a></li> </ul>
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<div class="title">Cgu::Thread::Mutex::Lock Class Reference</div> </div>
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<p>A scoped locking class for exception safe <a class="el" href="classCgu_1_1Thread_1_1Mutex.html" title="A wrapper class for pthread mutexes. ">Mutex</a> locking.
<a href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html#details">More...</a></p>
<p><code>#include <<a class="el" href="mutex_8h_source.html">c++-gtk-utils/mutex.h</a>></code></p>
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Public Member Functions</h2></td></tr>
<tr class="memitem:a0c3c7903cdf00bcf2154f47086bdf12b"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html#a0c3c7903cdf00bcf2154f47086bdf12b">Lock</a> (const <a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html">Mutex::Lock</a> &)=delete</td></tr>
<tr class="separator:a0c3c7903cdf00bcf2154f47086bdf12b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a71b6a02a3fa0d5a8ff9047fd2464c627"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html">Mutex::Lock</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html#a71b6a02a3fa0d5a8ff9047fd2464c627">operator=</a> (const <a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html">Mutex::Lock</a> &)=delete</td></tr>
<tr class="separator:a71b6a02a3fa0d5a8ff9047fd2464c627"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a0b53b26fd27b45b22f0c797babc64660"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html#a0b53b26fd27b45b22f0c797babc64660">lock</a> () noexcept</td></tr>
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<tr class="memitem:aac0005a933bb34e8c8bf0c3b61b3a326"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html#aac0005a933bb34e8c8bf0c3b61b3a326">trylock</a> () noexcept</td></tr>
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<tr class="memitem:a8d127e76c2e77245ec458eaf6f317a68"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html#a8d127e76c2e77245ec458eaf6f317a68">unlock</a> () noexcept</td></tr>
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<tr class="memitem:abdba7494e194f3f50e096f217c1ad2e3"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html#abdba7494e194f3f50e096f217c1ad2e3">Lock</a> (<a class="el" href="classCgu_1_1Thread_1_1Mutex.html">Mutex</a> &mutex_) noexcept</td></tr>
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<tr class="memitem:aa39c2c4ab1247a85f90801f82ae3348e"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html#aa39c2c4ab1247a85f90801f82ae3348e">Lock</a> (<a class="el" href="classCgu_1_1Thread_1_1Mutex.html">Mutex</a> &mutex_, <a class="el" href="namespaceCgu_1_1Thread.html#ae859cc661aefb3465ab878a3f7305910">Locked</a> tag) noexcept</td></tr>
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<tr class="memitem:a9ae4775659c9f70682b9503d79b646c5"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html#a9ae4775659c9f70682b9503d79b646c5">Lock</a> ()=delete</td></tr>
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<tr class="memitem:a5f76a044a2598796b310738b91219a3b"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html#a5f76a044a2598796b310738b91219a3b">~Lock</a> ()</td></tr>
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Friends</h2></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>A scoped locking class for exception safe <a class="el" href="classCgu_1_1Thread_1_1Mutex.html" title="A wrapper class for pthread mutexes. ">Mutex</a> locking. </p>
<dl class="section see"><dt>See Also</dt><dd><a class="el" href="classCgu_1_1Thread_1_1Mutex.html" title="A wrapper class for pthread mutexes. ">Thread::Mutex</a> <a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1TrackLock.html" title="A scoped locking class for exception safe Mutex locking which tracks the status of its mutex...">Thread::Mutex::TrackLock</a> <a class="el" href="classCgu_1_1Thread_1_1Thread.html" title="A class representing a pthread thread. ">Thread::Thread</a> <a class="el" href="classCgu_1_1Thread_1_1Cond.html" title="A wrapper class for pthread condition variables. ">Thread::Cond</a> </dd></dl>
</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<td class="memname">Cgu::Thread::Mutex::Lock::Lock </td>
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<td class="paramtype">const <a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html">Mutex::Lock</a> & </td>
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<p>This class cannot be copied. The copy constructor is deleted. </p>
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<td class="memname">Cgu::Thread::Mutex::Lock::Lock </td>
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<p>This constructor locks the mutex passed to it. It is not a cancellation point. It does not throw. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">mutex_</td><td>The mutex to be locked. </td></tr>
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<p>This constructor takes an already locked mutex (say as a result of <a class="el" href="classCgu_1_1Thread_1_1Mutex.html#af19346cf724ffdc508f5fe54889e57a0">Mutex::trylock()</a>), and takes ownership of it. It is not a cancellation point. It does not throw. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">mutex_</td><td>The mutex to be managed by this object. </td></tr>
<tr><td class="paramname">tag</td><td>Pass the <a class="el" href="namespaceCgu_1_1Thread.html#ae859cc661aefb3465ab878a3f7305910a852f8168e5f00130c64125b059109a35">Cgu::Thread::locked</a> enum tag to this parameter. </td></tr>
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<p>This class requires initialisation with a <a class="el" href="classCgu_1_1Thread_1_1Mutex.html" title="A wrapper class for pthread mutexes. ">Mutex</a>. The default constructor is deleted. </p>
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<p>The destructor unlocks the owned mutex. It is not a cancellation point. It does not throw. </p>
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<h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname">int Cgu::Thread::Mutex::Lock::lock </td>
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<p>Calls <a class="el" href="classCgu_1_1Thread_1_1Mutex.html#a4117ae4f42f0972dcd286d2cbb7e014c">Mutex::lock()</a>, and so locks the mutex and reacquires ownership. It blocks if the mutex is already locked until the mutex becomes free. This method should normally only be called if a previous call has been made to <a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html#a8d127e76c2e77245ec458eaf6f317a68">Mutex::Lock::unlock()</a> (that is, where the thread owning the <a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html" title="A scoped locking class for exception safe Mutex locking. ">Mutex::Lock</a> object has temporarily allowed another thread to take the mutex concerned). It is not a cancellation point. It does not throw. </p>
<dl class="section return"><dt>Returns</dt><dd>0 if successful, otherwise the pthread mutex error number. </dd></dl>
<dl class="section note"><dt>Note</dt><dd>With this library implementation, the only pthread error number which could be returned by this method is EDEADLK, which it would do if the default pthread mutex behaviour happens to return that error rather than deadlock in the case of recursive locking. Most default implementations do not do this and hence the return value is usually not worth checking for except during debugging. </dd></dl>
<dl class="section see"><dt>See Also</dt><dd><a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1TrackLock.html" title="A scoped locking class for exception safe Mutex locking which tracks the status of its mutex...">Mutex::TrackLock</a>. </dd></dl>
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<td class="memname"><a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html">Mutex::Lock</a>& Cgu::Thread::Mutex::Lock::operator= </td>
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<p>This class cannot be copied. The assignment operator is deleted. </p>
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<p>Calls <a class="el" href="classCgu_1_1Thread_1_1Mutex.html#af19346cf724ffdc508f5fe54889e57a0">Mutex::trylock()</a>, and so tries to lock the mutex and reacquire ownership, but returns immediately if it is already locked with value EBUSY. This method should normally only be called if a previous call has been made to <a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html#a8d127e76c2e77245ec458eaf6f317a68">Mutex::Lock::unlock()</a> (that is, where the thread owning the <a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html" title="A scoped locking class for exception safe Mutex locking. ">Mutex::Lock</a> object has temporarily allowed another thread to take the mutex concerned). It is not a cancellation point. It does not throw. </p>
<dl class="section return"><dt>Returns</dt><dd>0 if successful, otherwise EBUSY. </dd></dl>
<dl class="section note"><dt>Note</dt><dd>With this library implementation, the only pthread error number which could be returned by this method is EBUSY. </dd></dl>
<dl class="section see"><dt>See Also</dt><dd><a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1TrackLock.html" title="A scoped locking class for exception safe Mutex locking which tracks the status of its mutex...">Mutex::TrackLock</a>. </dd></dl>
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<p>Calls <a class="el" href="classCgu_1_1Thread_1_1Mutex.html#ade61c52c94dd0ddbea64fe434708ac37">Mutex::unlock()</a>, and so unlocks a locked mutex owned by the calling thread and relinquishes ownership (so temporarily allowing another thread to take the mutex). This method should normally only be called if it is to be followed by a call to <a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html#a0b53b26fd27b45b22f0c797babc64660">Mutex::Lock::lock()</a> or a successful call to <a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html#aac0005a933bb34e8c8bf0c3b61b3a326">Mutex::Lock::trylock()</a> before the <a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html" title="A scoped locking class for exception safe Mutex locking. ">Mutex::Lock</a> object concerned goes out of scope (otherwise <a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html" title="A scoped locking class for exception safe Mutex locking. ">Mutex::Lock</a>'s destructor will attempt to unlock an already unlocked mutex or a mutex of which another thread has by then taken ownership - <a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html" title="A scoped locking class for exception safe Mutex locking. ">Mutex::Lock</a> objects do not maintain state). See <a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1TrackLock.html#a70b7063c7fd361dd8a260ffb1fc51ba0">Mutex::TrackLock::unlock()</a> for a safe version of this method. It is not a cancellation point. It does not throw. </p>
<dl class="section return"><dt>Returns</dt><dd>0 if successful, otherwise the pthread mutex error number. </dd></dl>
<dl class="section note"><dt>Note</dt><dd>With this library implementation, the only pthread error number which could be returned by this method is EPERM because the calling thread does not own the mutex (however POSIX does not require that return value in that case and hence the return value is usually not worth checking for except during debugging). </dd></dl>
<dl class="section see"><dt>See Also</dt><dd><a class="el" href="classCgu_1_1Thread_1_1Mutex_1_1TrackLock.html" title="A scoped locking class for exception safe Mutex locking which tracks the status of its mutex...">Mutex::TrackLock</a>. </dd></dl>
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<h2 class="groupheader">Friends And Related Function Documentation</h2>
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<td class="memname">friend class <a class="el" href="classCgu_1_1Thread_1_1Cond.html">Cond</a></td>
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<span class="mlabels"><span class="mlabel">friend</span></span> </td>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="mutex_8h_source.html">mutex.h</a></li>
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