read data from usb barcode scanner c# Multithreaded Programming in Visual C#

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Multithreaded Programming
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} ConsoleWrite("Tick "); } } public void Tock(bool running) { lock(lockOn) { if(!running) { // stop the clock return; }
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ConsoleWriteLine("Tock"); } } }
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After the substitution, the output produced by the program will look like this:
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Tick Tick Tick Tick Tick Tock Tock Tock Tock Tock Clock Stopped
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Clearly, the Tick( ) and Tock( ) methods are no longer synchronized!
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When developing multithreaded programs, you must be careful to avoid deadlock and race conditions Deadlock is, as the name implies, a situation in which one thread is waiting for another thread to do something, but that other thread is waiting on the first Thus, both threads are suspended, waiting for each other, and neither executes This situation is analogous to two overly polite people both insisting that the other step through a door first! Avoiding deadlock seems easy, but it s not For example, deadlock can occur in roundabout ways Consider the TickTock class As explained, if a final Pulse( ) is not executed by Tick( ) or Tock( ), then one or the other will be waiting indefinitely and the program is deadlocked Often the cause of the deadlock is not readily understood simply by looking at the source code to the program, because concurrently executing threads can interact in complex ways at runtime To avoid deadlock, careful programming and thorough testing is required In general, if a multithreaded program occasionally hangs, deadlock is the likely cause A race condition occurs when two (or more) threads attempt to access a shared resource at the same time, without proper synchronization For example, one thread may be writing a new value to a variable while another thread is incrementing the variable s current value Without synchronization, the outcome will depend on the order in which the threads execute (Does the second thread increment the original value or the new value written by the first thread ) In situations like this, the two threads are said to be racing each other, with the final outcome determined by which thread finishes first Like deadlock, a race condition can occur in difficult-to-discover ways The solution is prevention: careful programming that properly synchronizes access to shared resources
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Exploring the C# Library
Using MethodImplAttribute
It is possible to synchronize an entire method by using the MethodImplAttribute attribute This approach can be used as an alternative to the lock statement in cases in which the entire contents of a method are to be locked MethodImplAttribute is defined within the SystemRuntimeCompilerServices namespace The constructor that applies to synchronization is shown here: public MethodImplAttribute(MethodImplOptions opt) Here, opt specifies the implementation attribute To synchronize a method, specify MethodImplOptionsSynchronized This attribute causes the entire method to be locked on the instance (that is, via this) (In the case of static methods, the type is locked on) Thus, it must not be used on a public object or with a public class Here is a rewrite of the TickTock class that uses MethodImplAttribute to provide synchronization:
// Use MethodImplAttribute to synchronize a method using System; using SystemThreading; using SystemRuntimeCompilerServices; // Rewrite of TickTock to use MethodImplOptionsSynchronized class TickTock { /* The following attribute synchronizes the entire Tick() method */ [MethodImplAttribute(MethodImplOptionsSynchronized)] public void Tick(bool running) { if(!running) { // stop the clock MonitorPulse(this); // notify any waiting threads return; } ConsoleWrite("Tick "); MonitorPulse(this); // let Tock() run MonitorWait(this); // wait for Tock() to complete }
/* The following attribute synchronizes the entire Tock() method */ [MethodImplAttribute(MethodImplOptionsSynchronized)] public void Tock(bool running) { if(!running) { // stop the clock MonitorPulse(this); // notify any waiting threads return; } ConsoleWriteLine("Tock");
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Multithreaded Programming
MonitorPulse(this); // let Tick() run MonitorWait(this); // wait for Tick() to complete } } class MyThread { public Thread Thrd; TickTock ttOb; // Construct a new thread public MyThread(string name, TickTock tt) { Thrd = new Thread(thisRun); ttOb = tt; ThrdName = name; ThrdStart(); } // Begin execution of new thread void Run() { if(ThrdName == "Tick") { for(int i=0; i<5; i++) ttObTick(true); ttObTick(false); } else { for(int i=0; i<5; i++) ttObTock(true); ttObTock(false); } } } class TickingClock { static void Main() { TickTock tt = new TickTock(); MyThread mt1 = new MyThread("Tick", tt); MyThread mt2 = new MyThread("Tock", tt); mt1ThrdJoin(); mt2ThrdJoin(); ConsoleWriteLine("Clock Stopped"); } }
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