Correctly handle the readline threading issue, tested with sessions.

git-svn-id: file:///home/svn/framework3/trunk@5541 4d416f70-5f16-0410-b530-b9f4589650da

lib/rex/ui/text/input/readline.rb

@@ -15,7 +15,7 @@ begin
 	###
 	class Input::Readline < Rex::Ui::Text::Input
 		include ::Readline
-
+		
 		#
 		# Initializes the readline-aware Input instance for text.
 		#
@@ -74,14 +74,19 @@ begin
 		# receives, massively slowing down the entire framework.
 		#
 		def pgets
-			
-			if(true)
+		
+			if(Rex::Compat.is_windows())
 				output.prompting
 				line = ::Readline.readline(prompt, true)
 				HISTORY.pop if (line and line.empty?)
 				return line
 			end
-			
+
+			# Wrap readline in a child process and secure with a mutex
+			# This prevents threading hangs in the calling process.
+			require "thread"
+			@@child_mutex ||= Mutex.new
+			@@child_mutex.synchronize do
 			
 			output.prompting
 
@@ -112,6 +117,9 @@ begin
 				eof = true
 				return line
 			end
+			
+			# Release the readline mutex
+			end
 		end
 
 		#