--- /dev/null
+<sect1>Release notes for version~4.04---7/99
+<label id="release-4-04">
+<p>
+
+<itemize>
+<item> <tt/Weak/ library changes:
+ <itemize>
+ <item> Finalise is now spelt finalize in all function names.
+ <item> <tt/finalize/ now runs the finalizer immediately, and
+ waits for it to complete before returning.
+ <item> <tt/mkWeak/ now takes a <tt/Maybe (IO ())/ for the finalizer,
+ and <tt/mkWeakNoFinalizer/ is removed.
+ <item> A weak pointer whose key is itself a weak pointer will now do
+ the right thing.
+ </itemize>
+
+<item> Changed representation of <tt/Integer/ type to speed up
+computations on small integers. The performance of <tt/Integer/ is now
+only slightly slower than <tt/Int/ for values between <tt/minBound::Int/
+and <tt/maxBound::Int/.
+
+<item> On Win32 platforms, added support for using (and producing) dynamic
+link libraries (DLLs) containing ghc-compiled code.
+
+<item> Added @-funbox-strict-fields@ for unboxing/unpacking strict
+constructor fields.
+
+<item> GHC now has a license! Check out <tt>fptools/ghc/LICENSE/</tt>.
+
+<item> Added CPR analysis, which reduces allocation by unboxing
+function results (thanks to Kevin Glynn <tt><keving@@cs.mu.OZ.AU></tt>).
+
+<item> UsageSP analysis added, but not yet functional.
+
+<item> Added a simple common sub-expression analysis pass.
+
+<item> Implemented update-in-place for certain very restricted cases.
+
+<item> Replaced GHC's old and worn yacc/lex parser with a new one
+based on Happy. Fixed several Haskell 98 non-conformance issues in
+the process.
+
+<item> Added <tt>Concurrent.yield :: IO ()</tt>.
+
+<item> Added RULES pragms - transformation rules for Haskell source.
+This is used for list fusion: now intermediate lists between map,
+foldr, list comprehensions are removed automatically.
+
+<item> Unregisterised/unmangled builds now work.
+
+<item> Much performance tuning: GHC 4.04 produces faster code than all
+previous compilers.
+
+<item> GHC now defines <tt/__HASKELL98__/ when compiling files with
+<tt/-cpp/.
+
+<item> <tt/hppa1.1-hp-hpux/ port reinstated.
+
+<item> New operations for unsafely thawing byte arrays:
+<tt/unsafeThaw{Byte,ST,IO}Array/.
+
+<item> <tt/mkdependHS/ now lives in GHC's lib directory, not the
+binary directory. It isn't intended to be run standalone, only via
+<tt/ghc -M/.
+
+<item> Asynchronous exceptions are now supported (see Section <ref name="The Concurrent Library" id="concurrent-interface">). New operations:
+
+ <itemize> <item> <tt/Exception.killThread/ now raises an exception
+ (<tt/AsyncException.KilledThread/) in the killed thread.
+ <item> <tt/Exception.raiseInThread/ allows a thread to raise an
+ exception in another thread.
+ <item> <tt/Concurrent.myThreadId/ returns the <tt/ThreadId/ of the
+ calling thread.
+ <item> Stack overflow results in <tt/AsyncException.StackOverflow/
+ being raised in the offending thread.
+ </itemize>
+
+<item> Assertion failures now raise an <tt/AssertionFailed/ exception.
+
+<item> Added simple high-level interface to the Regex library, see
+Section <ref name="The RegexString Library" id="RegexString">.
+
+<item> <tt/forkIO/ now handles any uncaught exceptions cleanly.
+
+<item> <tt/integer2Int#/ isn't sign preserving any longer, but modulo
+<tt/(maxBound::Int + 1) * 2/.
+
+<item> <tt/-ddump-rdr/ is now called <tt/-ddump-parsed/.
+
+<item> Signal handling with the <tt/Posix/ library now works.
+
+<item> Many, many bugs fixed.
+
+</itemize>
%
-% $Id: glasgow_exts.vsgml,v 1.11 1999/05/18 15:41:32 simonpj Exp $
+% $Id: glasgow_exts.vsgml,v 1.12 1999/07/14 11:33:10 simonmar Exp $
%
% GHC Language Extensions.
%
id="rewrite-rules">.
%-----------------------------------------------------------------------------
-<sect1>Rewrite rules</sect1>
+<sect1>Rewrite rules
<label id="rewrite-rules">
<nidx>RULES pagma</nidx>
<nidx>pragma, RULES</nidx>
#-}
</verb></tscreen>
-<sect2>Syntax</sect2>
+<sect2>Syntax
+<p>
From a syntactic point of view:
<itemize>
<item> Rules are automatically exported from a module, just as instance declarations are.
</itemize>
-<sect2>Semantics</sect2>
+<sect2>Semantics
+<p>
From a semantic point of view:
<itemize>
</itemize>
-<sect2>Controlling what's going on</sect2>
+<sect2>Controlling what's going on
+<p>
<itemize>
<item> Use @-fddump-rules@ to see what transformation rules GHC is using.
-> IO Handler -- old handler
</verb></tscreen>
-@installHandler int handler iset@ calls @sigaction@ to install
-an interrupt handler for signal @int@. If @handler@ is
-@Default@, @SIG_DFL@ is installed; if @handler@ is
-@Ignore@, @SIG_IGN@ is installed; if @handler@ is
-@Catch action@, a handler is installed which will invoke @action@ as a
-replacement for @main@. If @iset@ is @Just s@, then the
-@sa_mask@ of the @sigaction@ structure is set to @s@;
-otherwise it is cleared. The previously installed signal handler for
-@int@ is returned.
+@installHandler int handler iset@ calls @sigaction@ to install an
+interrupt handler for signal @int@. If @handler@ is @Default@,
+@SIG_DFL@ is installed; if @handler@ is @Ignore@, @SIG_IGN@ is
+installed; if @handler@ is @Catch action@, a handler is installed
+which will invoke @action@ in a new thread when (or shortly after) the
+signal is received. See Section <ref name="Concurrent Haskell"
+id="concurrent-haskell"> for details on how to communicate between
+threads.
+
+If @iset@ is @Just s@, then the @sa_mask@ of the @sigaction@ structure
+is set to @s@; otherwise it is cleared. The previously installed
+signal handler for @int@ is returned.
<tscreen><verb>
getSignalMask :: IO SignalSet
</verb></tscreen>
@awaitSignal iset@ suspends execution until an interrupt is received.
-If @iset@ is @Just s@, @awaitSignal@ calls
-@sigsuspend@, installing @s@ as the new signal mask before
-suspending execution; otherwise, it calls @pause@. If successful,
-@awaitSignal@ does not return.
+If @iset@ is @Just s@, @awaitSignal@ calls @sigsuspend@, installing
+@s@ as the new signal mask before suspending execution; otherwise, it
+calls @pause@. @awaitSignal@ returns on receipt of a signal. If you
+have installed any signal handlers with @installHandler@, it may be
+wise to call @yield@ directly after @awaitSignal@ to ensure that the
+signal handler runs as promptly.
<tscreen><verb>
scheduleAlarm :: Int -> IO Int
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