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Commit 2f99cdb9 authored by Edward Z. Yang's avatar Edward Z. Yang
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Update docs for readMVar/tryReadMVar. 

Signed-off-by: Edward Z. Yang's avatarEdward Z. Yang <ezyang@mit.edu>
parent 193e0ee9
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docs/users_guide/7.8.1-notes.xml
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......@@ -279,12 +279,16 @@
</listitem>
<listitem>
<para>
<literal>Control.Concurrent.MVar</literal> has two
new functions, <literal>atomicReadMVar</literal> and
<literal>tryAtomicReadMVar</literal>, which
implement <literal>readMVar</literal> that cannot be
affected by other threads. (XXXX we may change the implementation
of <literal>readMVar</literal> to use this.)
<literal>Control.Concurrent.MVar</literal> has a new
implementation of <literal>readMVar</literal>, which
fixes a long-standing bug where
<literal>readMVar</literal> is only atomic if there
are no other threads running
<literal>putMVar</literal>.
<literal>readMVar</literal> now is atomic, and is
guaranteed to return the value from the first
<literal>putMVar</literal>. There is also a new <literal>tryReadMVar</literal>
which is a non-blocking version.
</para>
</listitem>
</itemizedlist>
......
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