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>Control.Monad.STM</TITLE
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>stm-2.1.1.2: Software Transactional Memory</TD
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>Contents</A
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>Index</A
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>Control.Monad.STM</FONT
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><TD CLASS="infohead"
>Portability</TD
><TD CLASS="infoval"
>non-portable (requires STM)</TD
></TR
><TR
><TD CLASS="infohead"
>Stability</TD
><TD CLASS="infoval"
>experimental</TD
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>Maintainer</TD
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>libraries@haskell.org</TD
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><TD CLASS="section1"
>Description</TD
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><P
>Software Transactional Memory: a modular composable concurrency
 abstraction.  See
</P
><UL
><LI
> <EM
>Composable memory transactions</EM
>, by Tim Harris, Simon Marlow, Simon
    Peyton Jones, and Maurice Herlihy, in /ACM Conference on Principles
    and Practice of Parallel Programming/ 2005.
    <A HREF="http://research.microsoft.com/Users/simonpj/papers/stm/index.htm"
>http://research.microsoft.com/Users/simonpj/papers/stm/index.htm</A
>
</LI
></UL
><P
>This module only defines the <TT
><A HREF="../base/GHC-Conc.html#t%3ASTM"
>STM</A
></TT
> monad; you probably want to 
 import <A HREF="Control-Concurrent-STM.html"
>Control.Concurrent.STM</A
> (which exports <A HREF="Control-Monad-STM.html"
>Control.Monad.STM</A
>).
</P
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><TD CLASS="section1"
>Documentation</TD
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></TD
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><TR
><TD CLASS="decl"
><A HREF="../base/GHC-Conc.html#t%3ASTM"
>STM</A
> (<A HREF="../base/GHC-Conc.html#v%3ASTM"
>STM</A
>)</TD
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></TD
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><TD CLASS="decl"
><A HREF="../base/GHC-Conc.html#v%3Aatomically"
>atomically</A
></TD
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></TD
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><TD CLASS="decl"
><A HREF="../base/GHC-Conc.html#v%3Aalways"
>always</A
></TD
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></TD
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><TD CLASS="decl"
><A HREF="../base/GHC-Conc.html#v%3AalwaysSucceeds"
>alwaysSucceeds</A
></TD
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></TD
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><TD CLASS="decl"
><A HREF="../base/GHC-Conc.html#v%3Aretry"
>retry</A
></TD
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></TD
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><TD CLASS="decl"
><A HREF="../base/GHC-Conc.html#v%3AorElse"
>orElse</A
></TD
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><TR
><TD CLASS="s15"
></TD
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><TD CLASS="decl"
><A NAME="v:check"
><A NAME="v%3Acheck"
></A
></A
><B
>check</B
> ::  <A HREF="../ghc-prim/GHC-Bool.html#t%3ABool"
>Bool</A
> -&gt; <A HREF="../base/GHC-Conc.html#t%3ASTM"
>STM</A
> a</TD
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><TD CLASS="s15"
></TD
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><TD CLASS="decl"
><A HREF="../base/GHC-Conc.html#v%3AcatchSTM"
>catchSTM</A
></TD
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