1 files changed, 27 insertions, 0 deletions
diff --git a/contrib/perl5/ext/Thread/lock.t b/contrib/perl5/ext/Thread/lock.t
new file mode 100644
index 0000000..fefb129
--- /dev/null
+++ b/contrib/perl5/ext/Thread/lock.t
@@ -0,0 +1,27 @@
+use Thread;
+
+$level = 0;
+
+sub worker
+{
+    my $num = shift;
+    my $i;
+    print "thread $num starting\n";
+    for ($i = 1; $i <= 20; $i++) {
+	print "thread $num iteration $i\n";
+	select(undef, undef, undef, rand(10)/100);
+	{
+	    lock($lock);
+	    warn "thread $num saw non-zero level = $level\n" if $level;
+	    $level++;
+	    print "thread $num has lock\n";
+	    select(undef, undef, undef, rand(10)/100);
+	    $level--;
+	}
+	print "thread $num released lock\n";
+    }
+}
+
+for ($t = 1; $t <= 5; $t++) {
+    new Thread \&worker, $t;
+}