* lib/un.rb (wait_writable): wait until target files can be

written actually.

	* win32/Makefile.sub (LDSHARED_0, LINK_SO): get rid of failure of
	  mt.exe.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@16754 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/un.rb

@@ -213,6 +213,33 @@ def touch
   end
 end
 
+##
+# Wait until the file becomes writable.
+#
+#   ruby -run -e wait_writable -- [OPTION] FILE
+#
+
+def wait_writable
+  setup("n:w:v") do |argv, options|
+    verbose = options[:verbose]
+    n = options[:n] and n = Integer(n)
+    wait = (wait = options[:w]) ? Float(wait) : 0.2
+    argv.each do |file|
+      begin
+        open(file, "r+b")
+      rescue Errno::ENOENT
+        break
+      rescue Errno::EACCES => e
+        raise if n and (n -= 1) <= 0
+        puts e
+        STDOUT.flush
+        sleep wait
+        retry
+      end
+    end
+  end
+end
+
 ##
 # Display help message.
 #