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and then attempts to obtain exclusive access on the position book by requesting a lock on PBook.posSync. This request will never get satisfied because the position book, which has received an update request from another thread, has already acquired a lock on posSync and is trying to obtain exclusive access on the order book by requesting a lock on OBook.orderSync. In a nutshell, neither the order book nor the position book will release its acquired lock, and both will go into an indefinite waiting period. The solution to solving deadlock problems resides in the Monitor class. It provides a TryEnter that is similar to Enter, but it will never go into an indefinite waiting period; instead, it accepts a timeout value, specifying how long the thread should wait for the lock. When the timeout value expires, TryEnter returns a value of false, which is an indicator of a deadlock problem in the program. The following code explains it well: using System; using System.Threading; class DeadLockFree { public class PositionBook { public object posSync = new object(); public OrderBook OBook; public void UpdateOrder(object order) { //try to obtain position book lock if ( !Monitor.TryEnter(posSync,TimeSpan.FromSeconds(5))) throw new ApplicationException("Failed to obtain Position Book Lock"); try { //try to obtain order book lock if ( !Monitor.TryEnter(OBook.orderSync,TimeSpan.FromSeconds(5))) throw new ApplicationException("Failed to obtain Order Book Lock"); try { //update order book } finally { //release order book lock Monitor.Exit(OBook.orderSync); } } finally { //release position book lock Monitor.Exit(posSync); } } } public class OrderBook { public PositionBook PBook; public object orderSync = new object();

To be honest, this word metaprogramming has never been on very solid footing. Particularly over the last few years, it seems to have come to refer to any code construction concept that hasn t been widely used or seen before. So you pick a language like Perl, take everything Ruby does that s more expressive or dynamic, and call that metaprogramming. That said, Ruby continues to surprise me with just how small it can make my code. The ability to refactor a problem not just by juggling functions around, but by restructuring the language almost at will makes for often remarkable productivity increases. Because I am a bear of very little brain, it has taken my forays into Ruby coding to truly recognize that any programming language is merely an abstraction in the same fashion as any library for that language. What we think of as keywords or primitives in a language are nothing more than defined and abstracted functionality.

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public void Add(object order) { //try to obtain order book lock if ( !Monitor.TryEnter(orderSync,TimeSpan.FromSeconds(5))) throw new ApplicationException("Failed to obtain Order Book Lock"); try { //try to obtain position book lock if ( !Monitor.TryEnter(PBook.posSync,TimeSpan.FromSeconds(5))) throw new ApplicationException("Failed to obtain Position Book Lock"); try { //update position book } finally { //release position book lock Monitor.Exit(PBook.posSync); } } finally { //release order book lock Monitor.Exit(orderSync); } } } }

<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%> <%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%> <html> <head> <title>Gadget List</title> </head> <body> <f:view> <h:messages/> <!-- Show the current gadget catalog --> <h:dataTable value="#{gadgetAdmin.allGadgets}" var="g"> <h:column> <f:facet name="header"> <h:outputText value="Type" /> </f:facet> <h:outputText value="#{g.type}" /> </h:column> <h:column> <f:facet name="header"> <h:outputText value="Description" /> </f:facet> <h:outputText value="#{g.description}" /> </h:column> </h:dataTable> <h:form> <!-- Link to add a new gadget --> <h:commandLink action="addGadget"> <h:outputText value="Add a new gadget" /> </h:commandLink> </h:form> </f:view> </body> </html>

Interthread notification is the most common requirement in a multithreaded application where the action of one thread depends upon the action of other threads. More simply, the thread is waiting on a specific condition that is supposed to be satisfied by another thread. For example, say you have a central order book where orders are queued by one thread, and a dedicated thread is assigned to dequeuing and processing these orders. This is the most commonly used threading pattern, and we will demonstrate it by creating a managed thread that provides full control over the execution of the underlying operating system thread. This is in contrast to the thread pool and asynchronous delegate where developers are shielded from the underlying complexities of manual thread management. Here s the code: using System; using System.Collections; using System.Threading; class InterThreadSignal { public class Order {} public class OrderBook { Thread orderSweeper; //event object initially set to nonsignal state ManualResetEvent manualEvent = new ManualResetEvent(false);

//create a thread-safe version of queue Queue orderQueue = Queue.Synchronized(new Queue()); public OrderBook() { //create order sweeper thread orderSweeper = new Thread(new ThreadStart(Process)); //start thread execution orderSweeper.Start(); } public void Add(Order order) { //enqueue the order orderQueue.Enqueue(order); //signal the sweeper thread about arrival of new order manualEvent.Set(); } public void Process() { while(true) { //wait for order to be enqueued manualEvent.WaitOne(); //set the event to nonsignal state manualEvent.Reset(); //process the order while(orderQueue.Count > 0 ) { Console.WriteLine("Processing Order"); //dequeue the order orderQueue.Dequeue(); } } } } static void Main(string[] args) { //create order book OrderBook orderBook = new OrderBook(); //start pumping orders //that will be concurrently processed by sweeper thread for(int ctr=0;ctr<=10;ctr++) { orderBook.Add(new Order()); } Console.ReadLine(); } }

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