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: Class RWLock
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calypso.util</FONT>
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Class RWLock</H2>
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<PRE>
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java.lang.Object
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+--<B>calypso.util.RWLock</B>
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<DT>public final class <B>RWLock</B><DT>extends java.lang.Object</DL>
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<P>
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A "read-write" lock. This lock allows for an arbitrary number of
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simultaneous readers. The lock can be upgraded to a write lock in two
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ways. First, the lock can be upgraded without guaranteeing invariance
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across the transition (in other words, the read lock may need to be
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released before the write lock can be acquired). The other form of
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upgrade guarantees invariance; however, the upgrade can only be
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performed by initially locking the lock using the invariant read lock
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enter method. Upgrading the lock in either case involves waiting until
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there are no more readers. This implementation gives priority to
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upgrades and invariant locks which may lead to reader starvation. <p>
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Each thread using the lock may re-enter the lock as many times as
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needed. However, attempting to re-enter the lock with the invariant
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read lock will fail unless the lock was originally entered that way by
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the invoking thread. <p>
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Only one thread may enter the invariant read lock at a time; other
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threads attempting this will block until the owning thread exits the
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lock completely. <p>
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Note that the implementation assumes that the user of instances of
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this class properly pairs the enters/exits. <p>
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<B>Constructor Summary</B></FONT></TD>
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<TD><CODE><B><A HREF="../../calypso/util/RWLock.html#RWLock()">RWLock</A></B>()</CODE>
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<BR>
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<B>Method Summary</B></FONT></TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE> void</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../calypso/util/RWLock.html#enterInvariantReadLock()">enterInvariantReadLock</A></B>()</CODE>
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<BR>
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Enter the invariant read lock.</TD>
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<CODE> void</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../calypso/util/RWLock.html#enterReadLock()">enterReadLock</A></B>()</CODE>
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<BR>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE> void</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../calypso/util/RWLock.html#enterWriteLock()">enterWriteLock</A></B>()</CODE>
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<BR>
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<CODE> void</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../calypso/util/RWLock.html#exitInvariantReadLock()">exitInvariantReadLock</A></B>()</CODE>
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<BR>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE> void</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../calypso/util/RWLock.html#exitReadLock()">exitReadLock</A></B>()</CODE>
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<BR>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE> void</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../calypso/util/RWLock.html#exitWriteLock()">exitWriteLock</A></B>()</CODE>
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<TD><B>Methods inherited from class java.lang.Object</B></TD>
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<TR BGCOLOR="white" ID="TableRowColor">
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<TD><CODE>clone,
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equals,
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finalize,
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getClass,
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hashCode,
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notify,
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notifyAll,
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toString,
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wait,
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wait,
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wait</CODE></TD>
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<!-- ============ FIELD DETAIL =========== -->
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<B>Constructor Detail</B></FONT></TD>
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<A NAME="RWLock()"><!-- --></A><H3>
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RWLock</H3>
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<PRE>
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public <B>RWLock</B>()</PRE>
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<DL>
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</DL>
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<A NAME="enterReadLock()"><!-- --></A><H3>
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enterReadLock</H3>
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<PRE>
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public void <B>enterReadLock</B>()
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throws java.lang.InterruptedException</PRE>
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<DL>
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</DL>
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<A NAME="exitReadLock()"><!-- --></A><H3>
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exitReadLock</H3>
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<PRE>
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public void <B>exitReadLock</B>()</PRE>
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<DL>
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</DL>
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<A NAME="enterInvariantReadLock()"><!-- --></A><H3>
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enterInvariantReadLock</H3>
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<PRE>
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public void <B>enterInvariantReadLock</B>()
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throws java.lang.InterruptedException</PRE>
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<DL>
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<DD>Enter the invariant read lock. Only one thread at a time can hold
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the invariant read lock. This lock guarantees to upgrade to a write
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lock without needing to release the read lock.</DL>
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<HR>
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<A NAME="exitInvariantReadLock()"><!-- --></A><H3>
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exitInvariantReadLock</H3>
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<PRE>
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public void <B>exitInvariantReadLock</B>()</PRE>
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<DL>
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</DL>
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<A NAME="enterWriteLock()"><!-- --></A><H3>
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enterWriteLock</H3>
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<PRE>
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public void <B>enterWriteLock</B>()
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throws java.lang.InterruptedException</PRE>
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<DL>
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</DL>
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<A NAME="exitWriteLock()"><!-- --></A><H3>
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exitWriteLock</H3>
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<PRE>
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public void <B>exitWriteLock</B>()</PRE>
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</DL>
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