As suggested by Arthur: the threads and threads::shared

[p5sagit/p5-mst-13.2.git] / ext / threads / threads.pm

diff --git a/ext/threads/threads.pm b/ext/threads/threads.pm
index a925898..11878eb 100755 (executable)
--- a/ext/threads/threads.pm
+++ b/ext/threads/threads.pm
@@ -1,8 +1,31 @@
 package threads;
 
-use 5.7.2;
+use 5.007_003;
 use strict;
 use warnings;
+use Config;
+
+BEGIN {
+    unless ($Config{useithreads}) {
+       my @caller = caller(2);
+        die <<EOF;
+$caller[1] line $caller[2]:
+
+This Perl hasn't been configured and built properly for the threads
+module to work.  (The 'useithreads' configuration option hasn't been used.)
+
+Having threads support requires all of Perl and all of the modules in
+the Perl installation to be rebuilt, it is not just a question of adding
+the threads module.  (In other words, threaded and non-threaded Perls
+are binary incompatible.)
+
+If you want to the use the threads module, please contact the people
+who built your Perl.
+
+Cannot continue, aborting.
+EOF
+    }
+}
 
 use overload
     '==' => \&equal,
@@ -128,6 +151,17 @@ quick way to get current thread id.
 
 =back
 
+=head1 WARNINGS
+
+=over 4
+
+=item Cleanup skipped %d active threads
+
+The main thread exited while there were still other threads running.
+This is not a good sign: you should either explicitly join the threads,
+or somehow be certain that all the non-main threads have finished.
+
+=back
 
 =head1 TODO