Eliminate "Old Perl threads tutorial", which describes 5005 threads.

pod/perlthrtut.pod is the same material reworked for ithreads.

9 files changed, 10 insertions, 1205 deletions

diff --git a/MANIFEST b/MANIFEST
index 33429f7e33..b44b0213d7 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -3600,7 +3600,6 @@ pod/perlnumber.pod		Perl number semantics
 pod/perlobj.pod			Perl objects
 pod/perlopentut.pod		Perl open() tutorial
 pod/perlop.pod			Perl operators and precedence
-pod/perlothrtut.pod		Old Perl threads tutorial
 pod/perlpacktut.pod		Perl pack() and unpack() tutorial
 pod/perlperf.pod		Perl Performance and Optimization Techniques
 pod/perl.pod			Perl overview (this section)
diff --git a/lib/perl5db.pl b/lib/perl5db.pl
index 765b0e57b9..9162d16212 100644
--- a/lib/perl5db.pl
+++ b/lib/perl5db.pl
@@ -8195,7 +8195,6 @@ my @pods = qw(
     os2
     os390
     os400
-    othrtut
     packtut
     plan9
     pod
diff --git a/plan9/mkfile b/plan9/mkfile
index 033faa3d04..54ea5a8dd5 100644
--- a/plan9/mkfile
+++ b/plan9/mkfile
@@ -22,7 +22,7 @@ installman3dir = /sys/man/2
 
 podnames = perl perlbook perlboot perlbot perldata perldebtut perldiag perldsc perlform perlfunc perlipc perllexwarn perllol perlmod perlmodlib perlmodinstall perlnewmod perlop perlopentut perlpacktut perlpod perlport perlrequick perlretut perlref perlreftut perlrequick perlrun perlsec perlstyle perlsub perlsyn perltie perltoc perltooc perltoot perltrap perlutil perlunifaq perluniintro perlvar
 faqpodnames = perlfaq perlfaq1 perlfaq2 perlfaq3 perlfaq4 perlfaq5 perlfaq6 perlfaq7 perlfaq8 perlfaq9
-advpodnames = perlapi perlapio perlcall perlclib perlcompile perldebguts perldbmfilter perldebug perldelta perldiag perlebcdic perlembed perlfilter perlfork perlguts perlhack perlintern perliol perllocale perlnumber perlobj perlothrtut perlpodspec perlre perlthrtut perltodo perlunicode perlxs perlxs perlxstut
+advpodnames = perlapi perlapio perlcall perlclib perlcompile perldebguts perldbmfilter perldebug perldelta perldiag perlebcdic perlembed perlfilter perlfork perlguts perlhack perlintern perliol perllocale perlnumber perlobj perlpodspec perlre perlthrtut perltodo perlunicode perlxs perlxs perlxstut
 archpodnames = perlaix perlamiga perlapollo perlbeos perlbs2000 perlce perlcygwin perldgux perldos perlepoc perlfreebsd perlhpux perlhurd perlirix perlmachten perlmacos perlmint perlmpeix perlnetware perlos2 perlos390 perlos400 perlplan9 perlqnx perlsolaris perltru64 perluts perlvmesa perlvms perlvos perlwin32
 histpods = perl5004delta perl5005delta perl561delta perl56delta perl570delta perl571delta perl572delta perl573delta perl58delta perlhist
 
diff --git a/pod.lst b/pod.lst
index d33c782f03..cf4ec98cb0 100644
--- a/pod.lst
+++ b/pod.lst
@@ -76,7 +76,6 @@ h Reference Manual
   perlnumber		Perl number semantics
 
   perlthrtut		Perl threads tutorial
-2 perlothrtut		Old Perl threads tutorial
 
   perlport		Perl portability guide
   perllocale		Perl locale support
diff --git a/pod/perl.pod b/pod/perl.pod
index b4b924597d..7470e99e03 100644
--- a/pod/perl.pod
+++ b/pod/perl.pod
@@ -91,7 +91,6 @@ For ease of access, the Perl manual has been split up into several sections.
     perlnumber		Perl number semantics
 
     perlthrtut		Perl threads tutorial
-      perlothrtut	Old Perl threads tutorial
 
     perlport		Perl portability guide
     perllocale		Perl locale support
diff --git a/pod/perlothrtut.pod b/pod/perlothrtut.pod
deleted file mode 100644
index e0d69c5059..0000000000
--- a/pod/perlothrtut.pod
+++ /dev/null
@@ -1,1067 +0,0 @@
-=head1 NAME
-
-perlothrtut - old tutorial on threads in Perl
-
-=head1 DESCRIPTION
-
-B<WARNING>:
-This tutorial describes the old-style thread model that was introduced in
-release 5.005. This model is deprecated, and has been removed
-for version 5.10. The interfaces described here were considered
-experimental, and are likely to be buggy.
-
-For information about the new interpreter threads ("ithreads") model, see
-the F<perlthrtut> tutorial, and the L<threads> and L<threads::shared>
-modules.
-
-You are strongly encouraged to migrate any existing threads code to the
-new model as soon as possible.
-
-=head1 What Is A Thread Anyway?
-
-A thread is a flow of control through a program with a single
-execution point.
-
-Sounds an awful lot like a process, doesn't it? Well, it should.
-Threads are one of the pieces of a process.  Every process has at least
-one thread and, up until now, every process running Perl had only one
-thread.  With 5.005, though, you can create extra threads.  We're going
-to show you how, when, and why.
-
-=head1 Threaded Program Models
-
-There are three basic ways that you can structure a threaded
-program.  Which model you choose depends on what you need your program
-to do.  For many non-trivial threaded programs you'll need to choose
-different models for different pieces of your program.
-
-=head2 Boss/Worker
-
-The boss/worker model usually has one `boss' thread and one or more
-`worker' threads.  The boss thread gathers or generates tasks that need
-to be done, then parcels those tasks out to the appropriate worker
-thread.
-
-This model is common in GUI and server programs, where a main thread
-waits for some event and then passes that event to the appropriate
-worker threads for processing.  Once the event has been passed on, the
-boss thread goes back to waiting for another event.
-
-The boss thread does relatively little work.  While tasks aren't
-necessarily performed faster than with any other method, it tends to
-have the best user-response times.
-
-=head2 Work Crew
-
-In the work crew model, several threads are created that do
-essentially the same thing to different pieces of data.  It closely
-mirrors classical parallel processing and vector processors, where a
-large array of processors do the exact same thing to many pieces of
-data.
-
-This model is particularly useful if the system running the program
-will distribute multiple threads across different processors.  It can
-also be useful in ray tracing or rendering engines, where the
-individual threads can pass on interim results to give the user visual
-feedback.
-
-=head2 Pipeline
-
-The pipeline model divides up a task into a series of steps, and
-passes the results of one step on to the thread processing the
-next.  Each thread does one thing to each piece of data and passes the
-results to the next thread in line.
-
-This model makes the most sense if you have multiple processors so two
-or more threads will be executing in parallel, though it can often
-make sense in other contexts as well.  It tends to keep the individual
-tasks small and simple, as well as allowing some parts of the pipeline
-to block (on I/O or system calls, for example) while other parts keep
-going.  If you're running different parts of the pipeline on different
-processors you may also take advantage of the caches on each
-processor.
-
-This model is also handy for a form of recursive programming where,
-rather than having a subroutine call itself, it instead creates
-another thread.  Prime and Fibonacci generators both map well to this
-form of the pipeline model. (A version of a prime number generator is
-presented later on.)
-
-=head1 Native threads
-
-There are several different ways to implement threads on a system.  How
-threads are implemented depends both on the vendor and, in some cases,
-the version of the operating system.  Often the first implementation
-will be relatively simple, but later versions of the OS will be more
-sophisticated.
-
-While the information in this section is useful, it's not necessary,
-so you can skip it if you don't feel up to it.
-
-There are three basic categories of threads-user-mode threads, kernel
-threads, and multiprocessor kernel threads.
-
-User-mode threads are threads that live entirely within a program and
-its libraries.  In this model, the OS knows nothing about threads.  As
-far as it's concerned, your process is just a process.
-
-This is the easiest way to implement threads, and the way most OSes
-start.  The big disadvantage is that, since the OS knows nothing about
-threads, if one thread blocks they all do.  Typical blocking activities
-include most system calls, most I/O, and things like sleep().
-
-Kernel threads are the next step in thread evolution.  The OS knows
-about kernel threads, and makes allowances for them.  The main
-difference between a kernel thread and a user-mode thread is
-blocking.  With kernel threads, things that block a single thread don't
-block other threads.  This is not the case with user-mode threads,
-where the kernel blocks at the process level and not the thread level.
-
-This is a big step forward, and can give a threaded program quite a
-performance boost over non-threaded programs.  Threads that block
-performing I/O, for example, won't block threads that are doing other
-things.  Each process still has only one thread running at once,
-though, regardless of how many CPUs a system might have.
-
-Since kernel threading can interrupt a thread at any time, they will
-uncover some of the implicit locking assumptions you may make in your
-program.  For example, something as simple as C<$a = $a + 2> can behave
-unpredictably with kernel threads if $a is visible to other
-threads, as another thread may have changed $a between the time it
-was fetched on the right hand side and the time the new value is
-stored.
-
-Multiprocessor Kernel Threads are the final step in thread
-support.  With multiprocessor kernel threads on a machine with multiple
-CPUs, the OS may schedule two or more threads to run simultaneously on
-different CPUs.
-
-This can give a serious performance boost to your threaded program,
-since more than one thread will be executing at the same time.  As a
-tradeoff, though, any of those nagging synchronization issues that
-might not have shown with basic kernel threads will appear with a
-vengeance.
-
-In addition to the different levels of OS involvement in threads,
-different OSes (and different thread implementations for a particular
-OS) allocate CPU cycles to threads in different ways.
-
-Cooperative multitasking systems have running threads give up control
-if one of two things happen.  If a thread calls a yield function, it
-gives up control.  It also gives up control if the thread does
-something that would cause it to block, such as perform I/O.  In a
-cooperative multitasking implementation, one thread can starve all the
-others for CPU time if it so chooses.
-
-Preemptive multitasking systems interrupt threads at regular intervals
-while the system decides which thread should run next.  In a preemptive
-multitasking system, one thread usually won't monopolize the CPU.
-
-On some systems, there can be cooperative and preemptive threads
-running simultaneously. (Threads running with realtime priorities
-often behave cooperatively, for example, while threads running at
-normal priorities behave preemptively.)
-
-=head1 What kind of threads are perl threads?
-
-If you have experience with other thread implementations, you might
-find that things aren't quite what you expect.  It's very important to
-remember when dealing with Perl threads that Perl Threads Are Not X
-Threads, for all values of X.  They aren't POSIX threads, or
-DecThreads, or Java's Green threads, or Win32 threads.  There are
-similarities, and the broad concepts are the same, but if you start
-looking for implementation details you're going to be either
-disappointed or confused.  Possibly both.
-
-This is not to say that Perl threads are completely different from
-everything that's ever come before--they're not.  Perl's threading
-model owes a lot to other thread models, especially POSIX.  Just as
-Perl is not C, though, Perl threads are not POSIX threads.  So if you
-find yourself looking for mutexes, or thread priorities, it's time to
-step back a bit and think about what you want to do and how Perl can
-do it.
-
-=head1 Threadsafe Modules
-
-The addition of threads has changed Perl's internals
-substantially.  There are implications for people who write
-modules--especially modules with XS code or external libraries.  While
-most modules won't encounter any problems, modules that aren't
-explicitly tagged as thread-safe should be tested before being used in
-production code.
-
-Not all modules that you might use are thread-safe, and you should
-always assume a module is unsafe unless the documentation says
-otherwise.  This includes modules that are distributed as part of the
-core.  Threads are a beta feature, and even some of the standard
-modules aren't thread-safe.
-
-If you're using a module that's not thread-safe for some reason, you
-can protect yourself by using semaphores and lots of programming
-discipline to control access to the module.  Semaphores are covered
-later in the article.  Perl Threads Are Different
-
-=head1 Thread Basics
-
-The core Thread module provides the basic functions you need to write
-threaded programs.  In the following sections we'll cover the basics,
-showing you what you need to do to create a threaded program.   After
-that, we'll go over some of the features of the Thread module that
-make threaded programming easier.
-
-=head2 Basic Thread Support
-
-Thread support is a Perl compile-time option-it's something that's
-turned on or off when Perl is built at your site, rather than when
-your programs are compiled. If your Perl wasn't compiled with thread
-support enabled, then any attempt to use threads will fail.
-
-Remember that the threading support in 5.005 is in beta release, and
-should be treated as such.   You should expect that it may not function
-entirely properly, and the thread interface may well change some
-before it is a fully supported, production release.  The beta version
-shouldn't be used for mission-critical projects.  Having said that,
-threaded Perl is pretty nifty, and worth a look.
-
-Your programs can use the Config module to check whether threads are
-enabled. If your program can't run without them, you can say something
-like:
-
-  $Config{usethreads} or die "Recompile Perl with threads to run this program.";
-
-A possibly-threaded program using a possibly-threaded module might
-have code like this:
-
-    use Config; 
-    use MyMod; 
-
-    if ($Config{usethreads}) { 
-        # We have threads 
-        require MyMod_threaded; 
-        import MyMod_threaded; 
-    } else { 
-        require MyMod_unthreaded; 
-        import MyMod_unthreaded; 
-    } 
-
-Since code that runs both with and without threads is usually pretty
-messy, it's best to isolate the thread-specific code in its own
-module.  In our example above, that's what MyMod_threaded is, and it's
-only imported if we're running on a threaded Perl.
-
-=head2 Creating Threads
-
-The Thread package provides the tools you need to create new
-threads.  Like any other module, you need to tell Perl you want to use
-it; use Thread imports all the pieces you need to create basic
-threads.
-
-The simplest, straightforward way to create a thread is with new():
-
-    use Thread; 
-
-    $thr = Thread->new( \&sub1 );
-
-    sub sub1 { 
-        print "In the thread\n"; 
-    }
-
-The new() method takes a reference to a subroutine and creates a new
-thread, which starts executing in the referenced subroutine.  Control
-then passes both to the subroutine and the caller.
-
-If you need to, your program can pass parameters to the subroutine as
-part of the thread startup.  Just include the list of parameters as
-part of the C<Thread::new> call, like this:
-
-    use Thread; 
-    $Param3 = "foo"; 
-    $thr = Thread->new( \&sub1, "Param 1", "Param 2", $Param3 );
-    $thr = Thread->new( \&sub1, @ParamList );
-    $thr = Thread->new( \&sub1, qw(Param1 Param2 $Param3) );
-
-    sub sub1 { 
-        my @InboundParameters = @_; 
-        print "In the thread\n"; 
-        print "got parameters >", join("<>", @InboundParameters), "<\n"; 
-    }
-
-
-The subroutine runs like a normal Perl subroutine, and the call to new
-Thread returns whatever the subroutine returns.
-
-The last example illustrates another feature of threads.  You can spawn
-off several threads using the same subroutine.  Each thread executes
-the same subroutine, but in a separate thread with a separate
-environment and potentially separate arguments.
-
-The other way to spawn a new thread is with async(), which is a way to
-spin off a chunk of code like eval(), but into its own thread:
-
-    use Thread qw(async);
-
-    $LineCount = 0; 
-
-    $thr = async { 
-        while(<>) {$LineCount++} 	 
-        print "Got $LineCount lines\n";
-    }; 
-
-    print "Waiting for the linecount to end\n"; 
-    $thr->join; 
-    print "All done\n";
-
-You'll notice we did a use Thread qw(async) in that example.  async is
-not exported by default, so if you want it, you'll either need to
-import it before you use it or fully qualify it as
-Thread::async.  You'll also note that there's a semicolon after the
-closing brace.  That's because async() treats the following block as an
-anonymous subroutine, so the semicolon is necessary.
-
-Like eval(), the code executes in the same context as it would if it
-weren't spun off.  Since both the code inside and after the async start
-executing, you need to be careful with any shared resources.  Locking
-and other synchronization techniques are covered later.
-
-=head2 Giving up control
-
-There are times when you may find it useful to have a thread
-explicitly give up the CPU to another thread.  Your threading package
-might not support preemptive multitasking for threads, for example, or
-you may be doing something compute-intensive and want to make sure
-that the user-interface thread gets called frequently.  Regardless,
-there are times that you might want a thread to give up the processor.
-
-Perl's threading package provides the yield() function that does
-this. yield() is pretty straightforward, and works like this:
-
-    use Thread qw(yield async); 
-    async { 
-        my $foo = 50; 
-        while ($foo--) { print "first async\n" }
-        yield; 
-        $foo = 50; 
-        while ($foo--) { print "first async\n" } 
-    }; 
-    async { 
-        my $foo = 50; 
-        while ($foo--) { print "second async\n" }
-        yield; 
-        $foo = 50; 
-        while ($foo--) { print "second async\n" } 
-    };
-
-=head2 Waiting For A Thread To Exit
-
-Since threads are also subroutines, they can return values.  To wait
-for a thread to exit and extract any scalars it might return, you can
-use the join() method.
-
-    use Thread; 
-    $thr = Thread->new( \&sub1 );
-
-    @ReturnData = $thr->join; 
-    print "Thread returned @ReturnData"; 
-
-    sub sub1 { return "Fifty-six", "foo", 2; }
-
-In the example above, the join() method returns as soon as the thread
-ends.  In addition to waiting for a thread to finish and gathering up
-any values that the thread might have returned, join() also performs
-any OS cleanup necessary for the thread.  That cleanup might be
-important, especially for long-running programs that spawn lots of
-threads.  If you don't want the return values and don't want to wait
-for the thread to finish, you should call the detach() method
-instead. detach() is covered later in the article.
-
-=head2 Errors In Threads
-
-So what happens when an error occurs in a thread? Any errors that
-could be caught with eval() are postponed until the thread is
-joined.  If your program never joins, the errors appear when your
-program exits.
-
-Errors deferred until a join() can be caught with eval():
-
-    use Thread qw(async); 
-    $thr = async {$b = 3/0};   # Divide by zero error
-    $foo = eval {$thr->join}; 
-    if ($@) { 
-        print "died with error $@\n"; 
-    } else { 
-        print "Hey, why aren't you dead?\n"; 
-    }
-
-eval() passes any results from the joined thread back unmodified, so
-if you want the return value of the thread, this is your only chance
-to get them.
-
-=head2 Ignoring A Thread
-
-join() does three things: it waits for a thread to exit, cleans up
-after it, and returns any data the thread may have produced.  But what
-if you're not interested in the thread's return values, and you don't
-really care when the thread finishes? All you want is for the thread
-to get cleaned up after when it's done.
-
-In this case, you use the detach() method.  Once a thread is detached,
-it'll run until it's finished, then Perl will clean up after it
-automatically.
-
-    use Thread; 
-    $thr = Thread->new( \&sub1 ); # Spawn the thread
-
-    $thr->detach; # Now we officially don't care any more
-
-    sub sub1 { 
-        $a = 0; 
-        while (1) { 
-            $a++; 
-            print "\$a is $a\n"; 
-            sleep 1; 
-        } 
-    }
-
-
-Once a thread is detached, it may not be joined, and any output that
-it might have produced (if it was done and waiting for a join) is
-lost.
-
-=head1 Threads And Data
-
-Now that we've covered the basics of threads, it's time for our next
-topic: data.  Threading introduces a couple of complications to data
-access that non-threaded programs never need to worry about.
-
-=head2 Shared And Unshared Data
-
-The single most important thing to remember when using threads is that
-all threads potentially have access to all the data anywhere in your
-program.  While this is true with a nonthreaded Perl program as well,
-it's especially important to remember with a threaded program, since
-more than one thread can be accessing this data at once.
-
-Perl's scoping rules don't change because you're using threads.  If a
-subroutine (or block, in the case of async()) could see a variable if
-you weren't running with threads, it can see it if you are.  This is
-especially important for the subroutines that create, and makes C<my>
-variables even more important.  Remember--if your variables aren't
-lexically scoped (declared with C<my>) you're probably sharing them
-between threads.
-
-=head2 Thread Pitfall: Races
-
-While threads bring a new set of useful tools, they also bring a
-number of pitfalls.  One pitfall is the race condition:
-
-    use Thread; 
-    $a = 1; 
-    $thr1 = Thread->new(\&sub1); 
-    $thr2 = Thread->new(\&sub2); 
-
-    sleep 10; 
-    print "$a\n";
-
-    sub sub1 { $foo = $a; $a = $foo + 1; }
-    sub sub2 { $bar = $a; $a = $bar + 1; }
-
-What do you think $a will be? The answer, unfortunately, is "it
-depends." Both sub1() and sub2() access the global variable $a, once
-to read and once to write.  Depending on factors ranging from your
-thread implementation's scheduling algorithm to the phase of the moon,
-$a can be 2 or 3.
-
-Race conditions are caused by unsynchronized access to shared
-data.  Without explicit synchronization, there's no way to be sure that
-nothing has happened to the shared data between the time you access it
-and the time you update it.  Even this simple code fragment has the
-possibility of error:
-
-    use Thread qw(async); 
-    $a = 2; 
-    async{ $b = $a; $a = $b + 1; }; 
-    async{ $c = $a; $a = $c + 1; };
-
-Two threads both access $a.  Each thread can potentially be interrupted
-at any point, or be executed in any order.  At the end, $a could be 3
-or 4, and both $b and $c could be 2 or 3.
-
-Whenever your program accesses data or resources that can be accessed
-by other threads, you must take steps to coordinate access or risk
-data corruption and race conditions.
-
-=head2 Controlling access: lock()
-
-The lock() function takes a variable (or subroutine, but we'll get to
-that later) and puts a lock on it.  No other thread may lock the
-variable until the locking thread exits the innermost block containing
-the lock.  Using lock() is straightforward:
-
-    use Thread qw(async); 
-    $a = 4; 
-    $thr1 = async { 
-        $foo = 12; 
-        { 
-            lock ($a); # Block until we get access to $a 
-            $b = $a; 
-            $a = $b * $foo; 
-        } 
-        print "\$foo was $foo\n";
-    }; 
-    $thr2 = async { 
-        $bar = 7; 
-        { 
-            lock ($a); # Block until we can get access to $a
-            $c = $a; 
-            $a = $c * $bar; 
-        } 
-        print "\$bar was $bar\n";
-    }; 
-    $thr1->join; 
-    $thr2->join; 
-    print "\$a is $a\n";
-
-lock() blocks the thread until the variable being locked is
-available.  When lock() returns, your thread can be sure that no other
-thread can lock that variable until the innermost block containing the
-lock exits.
-
-It's important to note that locks don't prevent access to the variable
-in question, only lock attempts.  This is in keeping with Perl's
-longstanding tradition of courteous programming, and the advisory file
-locking that flock() gives you.  Locked subroutines behave differently,
-however.  We'll cover that later in the article.
-
-You may lock arrays and hashes as well as scalars.  Locking an array,
-though, will not block subsequent locks on array elements, just lock
-attempts on the array itself.
-
-Finally, locks are recursive, which means it's okay for a thread to
-lock a variable more than once.  The lock will last until the outermost
-lock() on the variable goes out of scope.
-
-=head2 Thread Pitfall: Deadlocks
-
-Locks are a handy tool to synchronize access to data.  Using them
-properly is the key to safe shared data.  Unfortunately, locks aren't
-without their dangers.  Consider the following code:
-
-    use Thread qw(async yield); 
-    $a = 4; 
-    $b = "foo"; 
-    async { 
-        lock($a); 
-        yield; 
-        sleep 20; 
-        lock ($b); 
-    }; 
-    async { 
-        lock($b); 
-        yield; 
-        sleep 20; 
-        lock ($a); 
-    };
-
-This program will probably hang until you kill it.  The only way it
-won't hang is if one of the two async() routines acquires both locks
-first.  A guaranteed-to-hang version is more complicated, but the
-principle is the same.
-
-The first thread spawned by async() will grab a lock on $a then, a
-second or two later, try to grab a lock on $b.  Meanwhile, the second
-thread grabs a lock on $b, then later tries to grab a lock on $a.  The
-second lock attempt for both threads will block, each waiting for the
-other to release its lock.
-
-This condition is called a deadlock, and it occurs whenever two or
-more threads are trying to get locks on resources that the others
-own.  Each thread will block, waiting for the other to release a lock
-on a resource.  That never happens, though, since the thread with the
-resource is itself waiting for a lock to be released.
-
-There are a number of ways to handle this sort of problem.  The best
-way is to always have all threads acquire locks in the exact same
-order.  If, for example, you lock variables $a, $b, and $c, always lock
-$a before $b, and $b before $c.  It's also best to hold on to locks for
-as short a period of time to minimize the risks of deadlock.
-
-=head2 Queues: Passing Data Around
-
-A queue is a special thread-safe object that lets you put data in one
-end and take it out the other without having to worry about
-synchronization issues.  They're pretty straightforward, and look like
-this:
-
-    use Thread qw(async); 
-    use Thread::Queue;
-
-    my $DataQueue = Thread::Queue->new();
-    $thr = async { 
-        while ($DataElement = $DataQueue->dequeue) { 
-            print "Popped $DataElement off the queue\n";
-        } 
-    }; 
-
-    $DataQueue->enqueue(12); 
-    $DataQueue->enqueue("A", "B", "C"); 
-    sleep 10; 
-    $DataQueue->enqueue(undef);
-
-You create the queue with C<< Thread::Queue->new >>.  Then you can add
-lists of scalars onto the end with enqueue(), and pop scalars off the
-front of it with dequeue().  A queue has no fixed size, and can grow as
-needed to hold everything pushed on to it.
-
-If a queue is empty, dequeue() blocks until another thread enqueues
-something.  This makes queues ideal for event loops and other
-communications between threads.
-
-=head1 Threads And Code
-
-In addition to providing thread-safe access to data via locks and
-queues, threaded Perl also provides general-purpose semaphores for
-coarser synchronization than locks provide and thread-safe access to
-entire subroutines.
-
-=head2 Semaphores: Synchronizing Data Access
-
-Semaphores are a kind of generic locking mechanism.  Unlike lock, which
-gets a lock on a particular scalar, Perl doesn't associate any
-particular thing with a semaphore so you can use them to control
-access to anything you like.  In addition, semaphores can allow more
-than one thread to access a resource at once, though by default
-semaphores only allow one thread access at a time.
-
-=over 4
-
-=item Basic semaphores
-
-Semaphores have two methods, down and up. down decrements the resource
-count, while up increments it.  down calls will block if the
-semaphore's current count would decrement below zero.  This program
-gives a quick demonstration:
-
-    use Thread qw(yield); 
-    use Thread::Semaphore; 
-    my $semaphore = Thread::Semaphore->new();
-    $GlobalVariable = 0;
-
-    $thr1 = Thread->new( \&sample_sub, 1 );
-    $thr2 = Thread->new( \&sample_sub, 2 );
-    $thr3 = Thread->new( \&sample_sub, 3 );
-
-    sub sample_sub { 
-        my $SubNumber = shift @_; 
-        my $TryCount = 10; 
-        my $LocalCopy; 
-        sleep 1; 
-        while ($TryCount--) { 
-            $semaphore->down; 
-            $LocalCopy = $GlobalVariable; 
-            print "$TryCount tries left for sub $SubNumber (\$GlobalVariable is $GlobalVariable)\n"; 
-            yield; 
-            sleep 2; 
-            $LocalCopy++; 
-            $GlobalVariable = $LocalCopy; 
-            $semaphore->up; 
-        } 
-    }
-
-The three invocations of the subroutine all operate in sync.  The
-semaphore, though, makes sure that only one thread is accessing the
-global variable at once.
-
-=item Advanced Semaphores
-
-By default, semaphores behave like locks, letting only one thread
-down() them at a time.  However, there are other uses for semaphores.
-
-Each semaphore has a counter attached to it. down() decrements the
-counter and up() increments the counter.  By default, semaphores are
-created with the counter set to one, down() decrements by one, and
-up() increments by one.  If down() attempts to decrement the counter
-below zero, it blocks until the counter is large enough.  Note that
-while a semaphore can be created with a starting count of zero, any
-up() or down() always changes the counter by at least
-one. $semaphore->down(0) is the same as $semaphore->down(1).
-
-The question, of course, is why would you do something like this? Why
-create a semaphore with a starting count that's not one, or why
-decrement/increment it by more than one? The answer is resource
-availability.  Many resources that you want to manage access for can be
-safely used by more than one thread at once.
-
-For example, let's take a GUI driven program.  It has a semaphore that
-it uses to synchronize access to the display, so only one thread is
-ever drawing at once.  Handy, but of course you don't want any thread
-to start drawing until things are properly set up.  In this case, you
-can create a semaphore with a counter set to zero, and up it when
-things are ready for drawing.
-
-Semaphores with counters greater than one are also useful for
-establishing quotas.  Say, for example, that you have a number of
-threads that can do I/O at once.  You don't want all the threads
-reading or writing at once though, since that can potentially swamp
-your I/O channels, or deplete your process' quota of filehandles.  You
-can use a semaphore initialized to the number of concurrent I/O
-requests (or open files) that you want at any one time, and have your
-threads quietly block and unblock themselves.
-
-Larger increments or decrements are handy in those cases where a
-thread needs to check out or return a number of resources at once.
-
-=back
-
-=head2 Attributes: Restricting Access To Subroutines
-
-In addition to synchronizing access to data or resources, you might
-find it useful to synchronize access to subroutines.  You may be
-accessing a singular machine resource (perhaps a vector processor), or
-find it easier to serialize calls to a particular subroutine than to
-have a set of locks and semaphores.
-
-One of the additions to Perl 5.005 is subroutine attributes.  The
-Thread package uses these to provide several flavors of
-serialization.  It's important to remember that these attributes are
-used in the compilation phase of your program so you can't change a
-subroutine's behavior while your program is actually running.
-
-=head2 Subroutine Locks
-
-The basic subroutine lock looks like this:
-
-    sub test_sub :locked { 
-    }
-
-This ensures that only one thread will be executing this subroutine at
-any one time.  Once a thread calls this subroutine, any other thread
-that calls it will block until the thread in the subroutine exits
-it.  A more elaborate example looks like this:
-
-    use Thread qw(yield); 
-
-    Thread->new(\&thread_sub, 1);
-    Thread->new(\&thread_sub, 2);
-    Thread->new(\&thread_sub, 3);
-    Thread->new(\&thread_sub, 4);
-
-    sub sync_sub :locked { 
-        my $CallingThread = shift @_; 
-        print "In sync_sub for thread $CallingThread\n";
-        yield; 
-        sleep 3; 
-        print "Leaving sync_sub for thread $CallingThread\n"; 
-    }
-
-    sub thread_sub { 
-        my $ThreadID = shift @_; 
-        print "Thread $ThreadID calling sync_sub\n";
-        sync_sub($ThreadID); 
-        print "$ThreadID is done with sync_sub\n"; 
-    }
-
-The C<locked> attribute tells perl to lock sync_sub(), and if you run
-this, you can see that only one thread is in it at any one time.
-
-=head2 Methods
-
-Locking an entire subroutine can sometimes be overkill, especially
-when dealing with Perl objects.  When calling a method for an object,
-for example, you want to serialize calls to a method, so that only one
-thread will be in the subroutine for a particular object, but threads
-calling that subroutine for a different object aren't blocked.  The
-method attribute indicates whether the subroutine is really a method.
-
-    use Thread;
-
-    sub tester { 
-        my $thrnum = shift @_; 
-        my $bar = Foo->new();
-        foreach (1..10) { 	
-            print "$thrnum calling per_object\n"; 
-            $bar->per_object($thrnum); 	
-            print "$thrnum out of per_object\n"; 
-            yield; 
-            print "$thrnum calling one_at_a_time\n";
-            $bar->one_at_a_time($thrnum); 	
-            print "$thrnum out of one_at_a_time\n"; 
-            yield; 
-        } 
-    }
-
-    foreach my $thrnum (1..10) { 
-        Thread->new(\&tester, $thrnum);
-    }
-
-    package Foo; 
-    sub new { 
-        my $class = shift @_; 
-        return bless [@_], $class; 
-    }
-
-    sub per_object :locked :method { 
-        my ($class, $thrnum) = @_; 
-        print "In per_object for thread $thrnum\n"; 
-        yield; 
-        sleep 2; 
-        print "Exiting per_object for thread $thrnum\n"; 
-    }
-
-    sub one_at_a_time :locked { 
-        my ($class, $thrnum) = @_; 
-        print "In one_at_a_time for thread $thrnum\n";     
-        yield; 
-        sleep 2; 
-        print "Exiting one_at_a_time for thread $thrnum\n"; 
-    }
-
-As you can see from the output (omitted for brevity; it's 800 lines)
-all the threads can be in per_object() simultaneously, but only one
-thread is ever in one_at_a_time() at once.
-
-=head2 Locking A Subroutine
-
-You can lock a subroutine as you would lock a variable.  Subroutine locks
-work the same as specifying a C<locked> attribute for the subroutine,
-and block all access to the subroutine for other threads until the
-lock goes out of scope.  When the subroutine isn't locked, any number
-of threads can be in it at once, and getting a lock on a subroutine
-doesn't affect threads already in the subroutine.  Getting a lock on a
-subroutine looks like this:
-
-    lock(\&sub_to_lock);
-
-Simple enough.  Unlike the C<locked> attribute, which is a compile time
-option, locking and unlocking a subroutine can be done at runtime at your
-discretion.  There is some runtime penalty to using lock(\&sub) instead
-of the C<locked> attribute, so make sure you're choosing the proper
-method to do the locking.
-
-You'd choose lock(\&sub) when writing modules and code to run on both
-threaded and unthreaded Perl, especially for code that will run on
-5.004 or earlier Perls.  In that case, it's useful to have subroutines
-that should be serialized lock themselves if they're running threaded,
-like so:
-
-    package Foo; 
-    use Config; 
-    $Running_Threaded = 0;
-
-    BEGIN { $Running_Threaded = $Config{'usethreads'} }
-
-    sub sub1 { lock(\&sub1) if $Running_Threaded }
-
-
-This way you can ensure single-threadedness regardless of which
-version of Perl you're running.
-
-=head1 General Thread Utility Routines
-
-We've covered the workhorse parts of Perl's threading package, and
-with these tools you should be well on your way to writing threaded
-code and packages.  There are a few useful little pieces that didn't
-really fit in anyplace else.
-
-=head2 What Thread Am I In?
-
-The Thread->self method provides your program with a way to get an
-object representing the thread it's currently in.  You can use this
-object in the same way as the ones returned from the thread creation.
-
-=head2 Thread IDs
-
-tid() is a thread object method that returns the thread ID of the
-thread the object represents.  Thread IDs are integers, with the main
-thread in a program being 0.  Currently Perl assigns a unique tid to
-every thread ever created in your program, assigning the first thread
-to be created a tid of 1, and increasing the tid by 1 for each new
-thread that's created.
-
-=head2 Are These Threads The Same?
-
-The equal() method takes two thread objects and returns true 
-if the objects represent the same thread, and false if they don't.
-
-=head2 What Threads Are Running?
-
-Thread->list returns a list of thread objects, one for each thread
-that's currently running.  Handy for a number of things, including
-cleaning up at the end of your program:
-
-    # Loop through all the threads 
-    foreach $thr (Thread->list) { 
-        # Don't join the main thread or ourselves 
-        if ($thr->tid && !Thread::equal($thr, Thread->self)) { 
-            $thr->join; 
-        } 
-    }
-
-The example above is just for illustration.  It isn't strictly
-necessary to join all the threads you create, since Perl detaches all
-the threads before it exits.
-
-=head1 A Complete Example
-
-Confused yet? It's time for an example program to show some of the
-things we've covered.  This program finds prime numbers using threads.
-
-    1  #!/usr/bin/perl -w
-    2  # prime-pthread, courtesy of Tom Christiansen
-    3
-    4  use strict;
-    5
-    6  use Thread;
-    7  use Thread::Queue;
-    8
-    9  my $stream = Thread::Queue->new();
-    10 my $kid    = Thread->new(\&check_num, $stream, 2);
-    11
-    12 for my $i ( 3 .. 1000 ) {
-    13     $stream->enqueue($i);
-    14 } 
-    15
-    16 $stream->enqueue(undef);
-    17 $kid->join();
-    18
-    19 sub check_num {
-    20     my ($upstream, $cur_prime) = @_;
-    21     my $kid;
-    22     my $downstream = Thread::Queue->new();
-    23     while (my $num = $upstream->dequeue) {
-    24         next unless $num % $cur_prime;
-    25         if ($kid) {
-    26            $downstream->enqueue($num);
-    27          	} else {
-    28            print "Found prime $num\n";
-    29	              $kid = Thread->new(\&check_num, $downstream, $num);
-    30         }
-    31     } 
-    32     $downstream->enqueue(undef) if $kid;
-    33     $kid->join()		if $kid;
-    34 }
-
-This program uses the pipeline model to generate prime numbers.  Each
-thread in the pipeline has an input queue that feeds numbers to be
-checked, a prime number that it's responsible for, and an output queue
-that it funnels numbers that have failed the check into.  If the thread
-has a number that's failed its check and there's no child thread, then
-the thread must have found a new prime number.  In that case, a new
-child thread is created for that prime and stuck on the end of the
-pipeline.
-
-This probably sounds a bit more confusing than it really is, so lets
-go through this program piece by piece and see what it does.  (For
-those of you who might be trying to remember exactly what a prime
-number is, it's a number that's only evenly divisible by itself and 1)
-
-The bulk of the work is done by the check_num() subroutine, which
-takes a reference to its input queue and a prime number that it's
-responsible for.  After pulling in the input queue and the prime that
-the subroutine's checking (line 20), we create a new queue (line 22)
-and reserve a scalar for the thread that we're likely to create later
-(line 21).
-
-The while loop from lines 23 to line 31 grabs a scalar off the input
-queue and checks against the prime this thread is responsible
-for.  Line 24 checks to see if there's a remainder when we modulo the
-number to be checked against our prime.  If there is one, the number
-must not be evenly divisible by our prime, so we need to either pass
-it on to the next thread if we've created one (line 26) or create a
-new thread if we haven't.
-
-The new thread creation is line 29.  We pass on to it a reference to
-the queue we've created, and the prime number we've found.
-
-Finally, once the loop terminates (because we got a 0 or undef in the
-queue, which serves as a note to die), we pass on the notice to our
-child and wait for it to exit if we've created a child (Lines 32 and
-37).
-
-Meanwhile, back in the main thread, we create a queue (line 9) and the
-initial child thread (line 10), and pre-seed it with the first prime:
-2.  Then we queue all the numbers from 3 to 1000 for checking (lines
-12-14), then queue a die notice (line 16) and wait for the first child
-thread to terminate (line 17).  Because a child won't die until its
-child has died, we know that we're done once we return from the join.
-
-That's how it works.  It's pretty simple; as with many Perl programs,
-the explanation is much longer than the program.
-
-=head1 Conclusion
-
-A complete thread tutorial could fill a book (and has, many times),
-but this should get you well on your way.  The final authority on how
-Perl's threads behave is the documentation bundled with the Perl
-distribution, but with what we've covered in this article, you should
-be well on your way to becoming a threaded Perl expert.
-
-=head1 Bibliography
-
-Here's a short bibliography courtesy of Jürgen Christoffel:
-
-=head2 Introductory Texts
-
-Birrell, Andrew D. An Introduction to Programming with
-Threads. Digital Equipment Corporation, 1989, DEC-SRC Research Report
-#35 online as
-http://www.research.digital.com/SRC/staff/birrell/bib.html (highly
-recommended)
-
-Robbins, Kay. A., and Steven Robbins. Practical Unix Programming: A
-Guide to Concurrency, Communication, and
-Multithreading. Prentice-Hall, 1996.
-
-Lewis, Bill, and Daniel J. Berg. Multithreaded Programming with
-Pthreads. Prentice Hall, 1997, ISBN 0-13-443698-9 (a well-written
-introduction to threads).
-
-Nelson, Greg (editor). Systems Programming with Modula-3.  Prentice
-Hall, 1991, ISBN 0-13-590464-1.
-
-Nichols, Bradford, Dick Buttlar, and Jacqueline Proulx Farrell.
-Pthreads Programming. O'Reilly & Associates, 1996, ISBN 156592-115-1
-(covers POSIX threads).
-
-=head2 OS-Related References
-
-Boykin, Joseph, David Kirschen, Alan Langerman, and Susan
-LoVerso. Programming under Mach. Addison-Wesley, 1994, ISBN
-0-201-52739-1.
-
-Tanenbaum, Andrew S. Distributed Operating Systems. Prentice Hall,
-1995, ISBN 0-13-219908-4 (great textbook).
-
-Silberschatz, Abraham, and Peter B. Galvin. Operating System Concepts,
-4th ed. Addison-Wesley, 1995, ISBN 0-201-59292-4
-
-=head2 Other References
-
-Arnold, Ken and James Gosling. The Java Programming Language, 2nd
-ed. Addison-Wesley, 1998, ISBN 0-201-31006-6.
-
-Le Sergent, T. and B. Berthomieu. "Incremental MultiThreaded Garbage
-Collection on Virtually Shared Memory Architectures" in Memory
-Management: Proc. of the International Workshop IWMM 92, St. Malo,
-France, September 1992, Yves Bekkers and Jacques Cohen, eds. Springer,
-1992, ISBN 3540-55940-X (real-life thread applications).
-
-=head1 Acknowledgements
-
-Thanks (in no particular order) to Chaim Frenkel, Steve Fink, Gurusamy
-Sarathy, Ilya Zakharevich, Benjamin Sugars, Jürgen Christoffel, Joshua
-Pritikin, and Alan Burlison, for their help in reality-checking and
-polishing this article.  Big thanks to Tom Christiansen for his rewrite
-of the prime number generator.
-
-=head1 AUTHOR
-
-Dan Sugalski E<lt>sugalskd@ous.eduE<gt>
-
-=head1 Copyrights
-
-This article originally appeared in The Perl Journal #10, and is
-copyright 1998 The Perl Journal. It appears courtesy of Jon Orwant and
-The Perl Journal.  This document may be distributed under the same terms
-as Perl itself.
-
-
diff --git a/pod/perltoc.pod b/pod/perltoc.pod
index a220f8e511..209e6f6ed9 100644
--- a/pod/perltoc.pod
+++ b/pod/perltoc.pod
@@ -3646,122 +3646,6 @@ string
 
 =back
 
-=head2 perlothrtut - old tutorial on threads in Perl
-
-=over 4
-
-=item DESCRIPTION
-
-=item What Is A Thread Anyway?
-
-=item Threaded Program Models
-
-=over 4
-
-=item Boss/Worker
-
-=item Work Crew
-
-=item Pipeline
-
-=back
-
-=item Native threads
-
-=item What kind of threads are perl threads?
-
-=item Threadsafe Modules
-
-=item Thread Basics
-
-=over 4
-
-=item Basic Thread Support
-
-=item Creating Threads
-
-=item Giving up control
-
-=item Waiting For A Thread To Exit
-
-=item Errors In Threads
-
-=item Ignoring A Thread
-
-=back
-
-=item Threads And Data
-
-=over 4
-
-=item Shared And Unshared Data
-
-=item Thread Pitfall: Races
-
-=item Controlling access: lock()
-
-=item Thread Pitfall: Deadlocks
-
-=item Queues: Passing Data Around
-
-=back
-
-=item Threads And Code
-
-=over 4
-
-=item Semaphores: Synchronizing Data Access
-
-Basic semaphores, Advanced Semaphores
-
-=item Attributes: Restricting Access To Subroutines
-
-=item Subroutine Locks
-
-=item Methods
-
-=item Locking A Subroutine
-
-=back
-
-=item General Thread Utility Routines
-
-=over 4
-
-=item What Thread Am I In?
-
-=item Thread IDs
-
-=item Are These Threads The Same?
-
-=item What Threads Are Running?
-
-=back
-
-=item A Complete Example
-
-=item Conclusion
-
-=item Bibliography
-
-=over 4
-
-=item Introductory Texts
-
-=item OS-Related References
-
-=item Other References
-
-=back
-
-=item Acknowledgements
-
-=item AUTHOR
-
-=item Copyrights
-
-=back
-
 =head2 perlport - Writing portable Perl
 
 =over 4
diff --git a/vms/descrip_mms.template b/vms/descrip_mms.template
index d811c44863..6595a318ad 100644
--- a/vms/descrip_mms.template
+++ b/vms/descrip_mms.template
@@ -412,15 +412,15 @@ pod16 = [.lib.pods]perllinux.pod [.lib.pods]perllocale.pod [.lib.pods]perllol.po
 pod17 = [.lib.pods]perlmacosx.pod [.lib.pods]perlmint.pod [.lib.pods]perlmod.pod [.lib.pods]perlmodinstall.pod [.lib.pods]perlmodlib.pod
 pod18 = [.lib.pods]perlmodstyle.pod [.lib.pods]perlmpeix.pod [.lib.pods]perlnetware.pod [.lib.pods]perlnewmod.pod [.lib.pods]perlnumber.pod
 pod19 = [.lib.pods]perlobj.pod [.lib.pods]perlop.pod [.lib.pods]perlopenbsd.pod [.lib.pods]perlopentut.pod [.lib.pods]perlos2.pod [.lib.pods]perlos390.pod
-pod20 = [.lib.pods]perlos400.pod [.lib.pods]perlothrtut.pod [.lib.pods]perlpacktut.pod [.lib.pods]perlperf.pod [.lib.pods]perlplan9.pod
-pod21 = [.lib.pods]perlpod.pod [.lib.pods]perlpodspec.pod [.lib.pods]perlport.pod [.lib.pods]perlpragma.pod [.lib.pods]perlqnx.pod [.lib.pods]perlre.pod
-pod22 = [.lib.pods]perlreapi.pod [.lib.pods]perlrebackslash.pod [.lib.pods]perlrecharclass.pod [.lib.pods]perlref.pod [.lib.pods]perlreftut.pod
-pod23 = [.lib.pods]perlreguts.pod [.lib.pods]perlrepository.pod [.lib.pods]perlrequick.pod [.lib.pods]perlreref.pod [.lib.pods]perlretut.pod
-pod24 = [.lib.pods]perlriscos.pod [.lib.pods]perlrun.pod [.lib.pods]perlsec.pod [.lib.pods]perlsolaris.pod [.lib.pods]perlstyle.pod [.lib.pods]perlsub.pod
-pod25 = [.lib.pods]perlsymbian.pod [.lib.pods]perlsyn.pod [.lib.pods]perlthrtut.pod [.lib.pods]perltie.pod [.lib.pods]perltoc.pod [.lib.pods]perltodo.pod
-pod26 = [.lib.pods]perltooc.pod [.lib.pods]perltoot.pod [.lib.pods]perltrap.pod [.lib.pods]perltru64.pod [.lib.pods]perltw.pod [.lib.pods]perlunicode.pod
-pod27 = [.lib.pods]perlunifaq.pod [.lib.pods]perluniintro.pod [.lib.pods]perlunitut.pod [.lib.pods]perlutil.pod [.lib.pods]perluts.pod [.lib.pods]perlvar.pod
-pod28 = [.lib.pods]perlvmesa.pod [.lib.pods]perlvms.pod [.lib.pods]perlvos.pod [.lib.pods]perlwin32.pod [.lib.pods]perlxs.pod [.lib.pods]perlxstut.pod
+pod20 = [.lib.pods]perlos400.pod [.lib.pods]perlpacktut.pod [.lib.pods]perlperf.pod [.lib.pods]perlplan9.pod [.lib.pods]perlpod.pod
+pod21 = [.lib.pods]perlpodspec.pod [.lib.pods]perlport.pod [.lib.pods]perlpragma.pod [.lib.pods]perlqnx.pod [.lib.pods]perlre.pod [.lib.pods]perlreapi.pod
+pod22 = [.lib.pods]perlrebackslash.pod [.lib.pods]perlrecharclass.pod [.lib.pods]perlref.pod [.lib.pods]perlreftut.pod [.lib.pods]perlreguts.pod
+pod23 = [.lib.pods]perlrepository.pod [.lib.pods]perlrequick.pod [.lib.pods]perlreref.pod [.lib.pods]perlretut.pod [.lib.pods]perlriscos.pod
+pod24 = [.lib.pods]perlrun.pod [.lib.pods]perlsec.pod [.lib.pods]perlsolaris.pod [.lib.pods]perlstyle.pod [.lib.pods]perlsub.pod [.lib.pods]perlsymbian.pod
+pod25 = [.lib.pods]perlsyn.pod [.lib.pods]perlthrtut.pod [.lib.pods]perltie.pod [.lib.pods]perltoc.pod [.lib.pods]perltodo.pod [.lib.pods]perltooc.pod
+pod26 = [.lib.pods]perltoot.pod [.lib.pods]perltrap.pod [.lib.pods]perltru64.pod [.lib.pods]perltw.pod [.lib.pods]perlunicode.pod [.lib.pods]perlunifaq.pod
+pod27 = [.lib.pods]perluniintro.pod [.lib.pods]perlunitut.pod [.lib.pods]perlutil.pod [.lib.pods]perluts.pod [.lib.pods]perlvar.pod [.lib.pods]perlvmesa.pod
+pod28 = [.lib.pods]perlvms.pod [.lib.pods]perlvos.pod [.lib.pods]perlwin32.pod [.lib.pods]perlxs.pod [.lib.pods]perlxstut.pod
 pod = $(pod0) $(pod1) $(pod2) $(pod3) $(pod4) $(pod5) $(pod6) $(pod7) $(pod8) $(pod9) $(pod10) $(pod11) $(pod12) $(pod13) $(pod14) $(pod15) $(pod16) $(pod17) $(pod18) $(pod19) $(pod20) $(pod21) $(pod22) $(pod23) $(pod24) $(pod25) $(pod26) $(pod27) $(pod28)
 
 # Would be useful to automate the generation of this rule from pod/buildtoc
@@ -1180,10 +1180,6 @@ makeppport : $(MINIPERL_EXE) $(ARCHDIR)Config.pm
 	@ If F$Search("[.lib]pods.dir").eqs."" Then Create/Directory [.lib.pods]
 	Copy/NoConfirm/Log $(MMS$SOURCE) [.lib.pods]
 
-[.lib.pods]perlothrtut.pod : [.pod]perlothrtut.pod
-	@ If F$Search("[.lib]pods.dir").eqs."" Then Create/Directory [.lib.pods]
-	Copy/NoConfirm/Log $(MMS$SOURCE) [.lib.pods]
-
 [.lib.pods]perlpacktut.pod : [.pod]perlpacktut.pod
 	@ If F$Search("[.lib]pods.dir").eqs."" Then Create/Directory [.lib.pods]
 	Copy/NoConfirm/Log $(MMS$SOURCE) [.lib.pods]
diff --git a/win32/pod.mak b/win32/pod.mak
index 6f709f0370..011623cc73 100644
--- a/win32/pod.mak
+++ b/win32/pod.mak
@@ -98,7 +98,6 @@ POD = \
 	perlobj.pod	\
 	perlop.pod	\
 	perlopentut.pod	\
-	perlothrtut.pod	\
 	perlpacktut.pod	\
 	perlperf.pod	\
 	perlpod.pod	\
@@ -221,7 +220,6 @@ MAN = \
 	perlobj.man	\
 	perlop.man	\
 	perlopentut.man	\
-	perlothrtut.man	\
 	perlpacktut.man	\
 	perlperf.man	\
 	perlpod.man	\
@@ -344,7 +342,6 @@ HTML = \
 	perlobj.html	\
 	perlop.html	\
 	perlopentut.html	\
-	perlothrtut.html	\
 	perlpacktut.html	\
 	perlperf.html	\
 	perlpod.html	\
@@ -467,7 +464,6 @@ TEX = \
 	perlobj.tex	\
 	perlop.tex	\
 	perlopentut.tex	\
-	perlothrtut.tex	\
 	perlpacktut.tex	\
 	perlperf.tex	\
 	perlpod.tex	\