qr code c# open source Exploring the C# Library in Visual C#.NET

Painting QR-Code in Visual C#.NET Exploring the C# Library

Exploring the C# Library
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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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The proper Tick Tock output is the same as before As long as the method being synchronized is not defined by a public class or called on a public object, then whether you use lock or MethodImplAttribute is your decision Both produce the same results Because lock is a keyword built into C#, that is the approach the examples in this book will use
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R EMEMBER Do not use MethodImplAttribute with public classes or public instances Instead,
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use lock, locking on a private object (as explained earlier)
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Using a Mutex and a Semaphore
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Although C# s lock statement is sufficient for many synchronization needs, some situations, such as restricting access to a shared resource, are sometimes more conveniently handled by other synchronization mechanisms built into the NET Framework The two described here are related to each other: mutexes and semaphores
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The Mutex
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A mutex is a mutually exclusive synchronization object This means it can be acquired by one and only one thread at a time The mutex is designed for those situations in which a shared resource can be used by only one thread at a time For example, imagine a log file that is shared by several processes, but only one process can write to that file at any one time A mutex is the perfect synchronization device to handle this situation The mutex is supported by the SystemThreadingMutex class It has several constructors Two commonly used ones are shown here: public Mutex( ) public Mutex(bool initiallyOwned)
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Multithreaded Programming, Part One
The first version creates a mutex that is initially unowned In the second version, if initiallyOwned is true, the initial state of the mutex is owned by the calling thread Otherwise, it is unowned To acquire the mutex, your code will call WaitOne( ) on the mutex This method is inherited by Mutex from the ThreadWaitHandle class Here is its simplest form: public bool WaitOne( ); It waits until the mutex on which it is called can be acquired Thus, it blocks execution of the calling thread until the specified mutex is available It always returns true When your code no longer needs ownership of the mutex, it releases it by calling ReleaseMutex( ), shown here: public void ReleaseMutex( ) This releases the mutex on which it is called, enabling the mutex to be acquired by another thread To use a mutex to synchronize access to a shared resource, you will use WaitOne( ) and ReleaseMutex( ), as shown in the following sequence:
Mutex myMtx = new Mutex(); // myMtxWaitOne(); // wait to acquire the mutex // Access the shared resource myMtxReleaseMutex(); // release the mutex
PART II
When the call to WaitOne( ) takes place, execution of the thread will suspend until the mutex can be acquired When the call to ReleaseMutex( ) takes place, the mutex is released and another thread can acquire it Using this approach, access to a shared resource can be limited to one thread at a time The following program puts this framework into action It creates two threads, IncThread and DecThread, which both access a shared resource called SharedResCount IncThread increments SharedResCount and DecThread decrements it To prevent both threads from accessing SharedResCount at the same time, access is synchronized by the Mtx mutex, which is also part of the SharedRes class
// Use a Mutex using System; using SystemThreading; // This class contains a shared resource (Count), // and a mutex (Mtx) to control access to it class SharedRes { public static int Count = 0; public static Mutex Mtx = new Mutex(); } // This thread increments SharedResCount
Part II:
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