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>Control.Concurrent.Chan</TITLE
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>base-4.1.0.0: Basic libraries</TD
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>Control.Concurrent.Chan</FONT
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><TD ALIGN="right"
><TABLE CLASS="narrow" CELLSPACING="0" CELLPADDING="0"
><TR
><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
></TR
></TABLE
></TD
></TR
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><TD CLASS="section4"
><B
>Contents</B
></TD
></TR
><TR
><TD
><DL
><DT
><A HREF="#1"
>The <TT
><A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
></TT
> type
</A
></DT
><DT
><A HREF="#2"
>Operations
</A
></DT
><DT
><A HREF="#3"
>Stream interface
</A
></DT
></DL
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Description</TD
></TR
><TR
><TD CLASS="doc"
>Unbounded channels.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Synopsis</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A HREF="#t%3AChan"
>Chan</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AnewChan"
>newChan</A
> ::  <A HREF="System-IO.html#t%3AIO"
>IO</A
> (<A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
> a)</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AwriteChan"
>writeChan</A
> ::  <A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
> a -&gt; a -&gt; <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%3AreadChan"
>readChan</A
> ::  <A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
> a -&gt; <A HREF="System-IO.html#t%3AIO"
>IO</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AdupChan"
>dupChan</A
> ::  <A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
> a -&gt; <A HREF="System-IO.html#t%3AIO"
>IO</A
> (<A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
> a)</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AunGetChan"
>unGetChan</A
> ::  <A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
> a -&gt; a -&gt; <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%3AisEmptyChan"
>isEmptyChan</A
> ::  <A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
> a -&gt; <A HREF="System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim/GHC-Bool.html#t%3ABool"
>Bool</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgetChanContents"
>getChanContents</A
> ::  <A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
> a -&gt; <A HREF="System-IO.html#t%3AIO"
>IO</A
> [a]</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AwriteList2Chan"
>writeList2Chan</A
> ::  <A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
> a -&gt; [a] -&gt; <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
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
><A NAME="1"
><A NAME="1"
>The <TT
><A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
></TT
> type
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A NAME="t:Chan"
><A NAME="t%3AChan"
></A
></A
><B
>Chan</B
> a </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="ndoc"
><TT
><A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
></TT
> is an abstract type representing an unbounded FIFO channel.
</TD
></TR
><TR
><TD CLASS="section4"
><IMG SRC="minus.gif" CLASS="coll" ONCLICK="toggle(this,'i:Chan')" ALT="show/hide"
> Instances</TD
></TR
><TR
><TD CLASS="body"
><DIV ID="i:Chan" STYLE="display:block;"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="Data-Typeable.html#t%3ATypeable1"
>Typeable1</A
> <A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
><A NAME="2"
><A NAME="2"
>Operations
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:newChan"
><A NAME="v%3AnewChan"
></A
></A
><B
>newChan</B
> ::  <A HREF="System-IO.html#t%3AIO"
>IO</A
> (<A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
> a)</TD
></TR
><TR
><TD CLASS="doc"
>Build and returns a new instance of <TT
><A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
></TT
>.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:writeChan"
><A NAME="v%3AwriteChan"
></A
></A
><B
>writeChan</B
> ::  <A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
> a -&gt; a -&gt; <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"
>Write a value to a <TT
><A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
></TT
>.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:readChan"
><A NAME="v%3AreadChan"
></A
></A
><B
>readChan</B
> ::  <A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
> a -&gt; <A HREF="System-IO.html#t%3AIO"
>IO</A
> a</TD
></TR
><TR
><TD CLASS="doc"
>Read the next value from the <TT
><A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
></TT
>.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:dupChan"
><A NAME="v%3AdupChan"
></A
></A
><B
>dupChan</B
> ::  <A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
> a -&gt; <A HREF="System-IO.html#t%3AIO"
>IO</A
> (<A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
> a)</TD
></TR
><TR
><TD CLASS="doc"
>Duplicate a <TT
><A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
></TT
>: the duplicate channel begins empty, but data written to
 either channel from then on will be available from both.  Hence this creates
 a kind of broadcast channel, where data written by anyone is seen by
 everyone else.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:unGetChan"
><A NAME="v%3AunGetChan"
></A
></A
><B
>unGetChan</B
> ::  <A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
> a -&gt; a -&gt; <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"
>Put a data item back onto a channel, where it will be the next item read.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:isEmptyChan"
><A NAME="v%3AisEmptyChan"
></A
></A
><B
>isEmptyChan</B
> ::  <A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
> a -&gt; <A HREF="System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim/GHC-Bool.html#t%3ABool"
>Bool</A
></TD
></TR
><TR
><TD CLASS="doc"
>Returns <TT
><A HREF="../ghc-prim/GHC-Bool.html#v%3ATrue"
>True</A
></TT
> if the supplied <TT
><A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
></TT
> is empty.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
><A NAME="3"
><A NAME="3"
>Stream interface
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:getChanContents"
><A NAME="v%3AgetChanContents"
></A
></A
><B
>getChanContents</B
> ::  <A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
> a -&gt; <A HREF="System-IO.html#t%3AIO"
>IO</A
> [a]</TD
></TR
><TR
><TD CLASS="doc"
>Return a lazy list representing the contents of the supplied
 <TT
><A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
></TT
>, much like System.IO.hGetContents.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:writeList2Chan"
><A NAME="v%3AwriteList2Chan"
></A
></A
><B
>writeList2Chan</B
> ::  <A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
> a -&gt; [a] -&gt; <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"
>Write an entire list of items to a <TT
><A HREF="Control-Concurrent-Chan.html#t%3AChan"
>Chan</A
></TT
>.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="botbar"
>Produced by <A HREF="http://www.haskell.org/haddock/"
>Haddock</A
> version 2.4.2</TD
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