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<head>
<title>EOMultiReaderLock class documentation</title>
</head>
<body>
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<a href="EOControl.html">Up</a>
<br />
<h1><a name="title$EOMultiReaderLock">EOMultiReaderLock class documentation</a></h1>
<h3>Authors</h3>
<dl>
<dt>Generated by buildd</dt>
<dd>
</dd>
</dl>
<div>
</div>
<h1><a name="001000000000">
Software documentation for the EOMultiReaderLock class
</a></h1>
<h2><a name="class$EOMultiReaderLock">EOMultiReaderLock</a> : NSObject</h2>
<blockquote class="declared">
<dl>
<dt><b>Declared in:</b></dt>
<dd>EOControl/EOMultiReaderLock.h</dd>
</dl>
</blockquote>
<div class="desc">
WARNING !!! This class is in the middle of its
initial experimental implementation Do not use it
yet! But if you'd like to help implementing, please feel
free. EOMultiReaderLock is a recursive lock which
allows multiple threads to hold a lock for reading but
only one thread to hold a lock for writing and only when
all reading locks have been relinquished. Once thread
requests for a lock to write further requests for a
read lock are blocked until the write lock has been
granted and relinquished again. But this only holds
true if the thread requesting the reading lock does not
already hold a reading lock in which case it is
granted as it is assumed that this thread needs to
continue to release the previously acquired lock or
locks.
</div>
<hr width="50%" align="left" />
<a href="#_EOMultiReaderLock_ivars">Instance Variables</a>
<br/><br/>
<b>Method summary</b>
<ul>
<li><a rel="gsdoc" href="EOMultiReaderLock.html#method$EOMultiReaderLock-lockForReading">-lockForReading</a></li>
<li><a rel="gsdoc" href="EOMultiReaderLock.html#method$EOMultiReaderLock-lockForWriting">-lockForWriting</a></li>
<li><a rel="gsdoc" href="EOMultiReaderLock.html#method$EOMultiReaderLock-retrieveReaderLocks">-retrieveReaderLocks</a></li>
<li><a rel="gsdoc" href="EOMultiReaderLock.html#method$EOMultiReaderLock-suspendReaderLocks">-suspendReaderLocks</a></li>
<li><a rel="gsdoc" href="EOMultiReaderLock.html#method$EOMultiReaderLock-tryLockForReading">-tryLockForReading</a></li>
<li><a rel="gsdoc" href="EOMultiReaderLock.html#method$EOMultiReaderLock-tryLockForWriting">-tryLockForWriting</a></li>
<li><a rel="gsdoc" href="EOMultiReaderLock.html#method$EOMultiReaderLock-unlockForReading">-unlockForReading</a></li>
<li><a rel="gsdoc" href="EOMultiReaderLock.html#method$EOMultiReaderLock-unlockForWriting">-unlockForWriting</a></li>
</ul>
<hr width="50%" align="left" />
<div class="method">
<h3><a name="method$EOMultiReaderLock-lockForReading">lockForReading </a></h3>
- (void) <b>lockForReading</b>;<br />
<div class="desc">
</p>
<p>
Blocks until a lock for reading is obtained.
</p>
<p>
</p>
<p>
If the thread already holds this lock for reading or
writing the method returns immediatly. All
successful locks must be paired with
corresponding unlocks.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$EOMultiReaderLock-lockForWriting">lockForWriting </a></h3>
- (void) <b>lockForWriting</b>;<br />
<div class="desc">
</p>
<p>
Blocks until a lock for writing is obtained.
</p>
<p>
</p>
<p>
If the thread already holds this lock for reading or
writing the method returns immediatly. All
successful locks must be paired with
corresponding unlocks.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$EOMultiReaderLock-retrieveReaderLocks">retrieveReaderLocks </a></h3>
- (void) <b>retrieveReaderLocks</b>;<br />
<div class="desc">
</p>
<p>
Reenables the current registred locks.
</p>
<p>
</p>
<p>
This method blocks as <strong>long</strong> as a
writer lock is held by another thread.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$EOMultiReaderLock-suspendReaderLocks">suspendReaderLocks </a></h3>
- (void) <b>suspendReaderLocks</b>;<br />
<div class="desc">
</p>
<p>
Disables the currently registered reader locks.
</p>
<p>
</p>
<p>
Subsequent calls may increment the count for
it's thread but the lock is not reactivated.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$EOMultiReaderLock-tryLockForReading">tryLockForReading </a></h3>
- (BOOL) <b>tryLockForReading</b>;<br />
<div class="desc">
</p>
<p>
Tries to obtain a lock for reading. Returns
<code>NO</code> upon failure.
</p>
<p>
</p>
<p>
If the thread already holds this lock for reading or
writing the method returns true. All successful
locks must be paired with corresponding unlocks.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$EOMultiReaderLock-tryLockForWriting">tryLockForWriting </a></h3>
- (BOOL) <b>tryLockForWriting</b>;<br />
<div class="desc">
</p>
<p>
Tries to obtain a lock for writing. Returns
<code>NO</code> upon failure.
</p>
<p>
</p>
<p>
If the thread already holds this lock for reading or
writing the method returns true. All successful
locks must be paired with corresponding unlocks.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$EOMultiReaderLock-unlockForReading">unlockForReading </a></h3>
- (void) <b>unlockForReading</b>;<br />
<div class="desc">
</p>
<p>
Relinquishes obtained a previously obtained
lock for reading.
</p>
<p>
</p>
<p>
If the thread already holds this lock for reading or
writing the method returns immediatly. All
successful locks must be paired with
corresponding unlocks.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$EOMultiReaderLock-unlockForWriting">unlockForWriting </a></h3>
- (void) <b>unlockForWriting</b>;<br />
<div class="desc">
</p>
<p>
Relinquishes obtained a previously obtained
lock for writing.
</p>
<p>
</p>
<p>
If the thread already holds this lock for reading or
writing the method returns immediatly. All
successful locks must be paired with
corresponding unlocks.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<a name="_EOMultiReaderLock_ivars"/> <br/><hr width="50%" align="left" />
<h2>Instance Variables for EOMultiReaderLock Class</h2>
<h3><a name="ivariable$EOMultiReaderLock*_mutex">_mutex</a></h3>
@protected NSConditionLock* <b>_mutex</b>;<br />
<div class="desc">
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$EOMultiReaderLock*_readerFinishedCondition">_readerFinishedCondition</a></h3>
@protected int <b>_readerFinishedCondition</b>;<br />
<div class="desc">
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$EOMultiReaderLock*_readerThreads">_readerThreads</a></h3>
@protected NSMapTable* <b>_readerThreads</b>;<br />
<div class="desc">
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$EOMultiReaderLock*_writerFinishedCondition">_writerFinishedCondition</a></h3>
@protected int <b>_writerFinishedCondition</b>;<br />
<div class="desc">
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$EOMultiReaderLock*_writerLockCount">_writerLockCount</a></h3>
@protected unsigned int <b>_writerLockCount</b>;<br />
<div class="desc">
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$EOMultiReaderLock*_writerLockThread">_writerLockThread</a></h3>
@protected volatile NSThread* <b>_writerLockThread</b>;<br />
<div class="desc">
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
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