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>Control.Concurrent.QSem</TITLE
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>base-4.1.0.0: Basic libraries</TD
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>Control.Concurrent.QSem</FONT
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><TD CLASS="infohead"
>Portability</TD
><TD CLASS="infoval"
>non-portable (concurrency)</TD
></TR
><TR
><TD CLASS="infohead"
>Stability</TD
><TD CLASS="infoval"
>experimental</TD
></TR
><TR
><TD CLASS="infohead"
>Maintainer</TD
><TD CLASS="infoval"
>libraries@haskell.org</TD
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><TD CLASS="section4"
><B
>Contents</B
></TD
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><TR
><TD
><DL
><DT
><A HREF="#1"
>Simple Quantity Semaphores
</A
></DT
></DL
></TD
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></TD
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><TR
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><TD CLASS="section1"
>Description</TD
></TR
><TR
><TD CLASS="doc"
>Simple quantity semaphores.
</TD
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><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Synopsis</TD
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><TD CLASS="s15"
></TD
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><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
> <A HREF="#t%3AQSem"
>QSem</A
> </TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AnewQSem"
>newQSem</A
> :: <A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
> -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> <A HREF="Control-Concurrent-QSem.html#t%3AQSem"
>QSem</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AwaitQSem"
>waitQSem</A
> :: <A HREF="Control-Concurrent-QSem.html#t%3AQSem"
>QSem</A
> -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AsignalQSem"
>signalQSem</A
> :: <A HREF="Control-Concurrent-QSem.html#t%3AQSem"
>QSem</A
> -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
></TABLE
></TD
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><TR
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></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
><A NAME="1"
><A NAME="1"
>Simple Quantity Semaphores
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
> <A NAME="t:QSem"
><A NAME="t%3AQSem"
></A
></A
><B
>QSem</B
> </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="ndoc"
>A <TT
><A HREF="Control-Concurrent-QSem.html#t%3AQSem"
>QSem</A
></TT
> is a simple quantity semaphore, in which the available
"quantity" is always dealt with in units of one.
</TD
></TR
><TR
><TD CLASS="section4"
><IMG SRC="minus.gif" CLASS="coll" ONCLICK="toggle(this,'i:QSem')" ALT="show/hide"
> Instances</TD
></TR
><TR
><TD CLASS="body"
><DIV ID="i:QSem" STYLE="display:block;"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="Data-Typeable.html#t%3ATypeable"
>Typeable</A
> <A HREF="Control-Concurrent-QSem.html#t%3AQSem"
>QSem</A
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:newQSem"
><A NAME="v%3AnewQSem"
></A
></A
><B
>newQSem</B
> :: <A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
> -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> <A HREF="Control-Concurrent-QSem.html#t%3AQSem"
>QSem</A
></TD
></TR
><TR
><TD CLASS="doc"
>Build a new <TT
><A HREF="Control-Concurrent-QSem.html#t%3AQSem"
>QSem</A
></TT
>
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:waitQSem"
><A NAME="v%3AwaitQSem"
></A
></A
><B
>waitQSem</B
> :: <A HREF="Control-Concurrent-QSem.html#t%3AQSem"
>QSem</A
> -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="doc"
>Wait for a unit to become available
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:signalQSem"
><A NAME="v%3AsignalQSem"
></A
></A
><B
>signalQSem</B
> :: <A HREF="Control-Concurrent-QSem.html#t%3AQSem"
>QSem</A
> -> <A HREF="System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="doc"
>Signal that a unit of the <TT
><A HREF="Control-Concurrent-QSem.html#t%3AQSem"
>QSem</A
></TT
> is available
</TD
></TR
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></TD
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>Produced by <A HREF="http://www.haskell.org/haddock/"
>Haddock</A
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