qr code c# open source Synchronization Classes Added by NET 40 in C#

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Synchronization Classes Added by NET 40
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The synchronization classes discussed by the foregoing sections, such as Semaphore and AutoResetEvent, have been available in earlier versions of the NET Framework, with some going as far back as NET 11 As a result, these classes form the core of NET s support for
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Part II:
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Exploring the C# Library
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synchronization However, with the release of NET 40, several new synchronization alternatives have been added They are shown here:
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Class Barrier CountdownEvent ManualResetEventSlim SemaphoreSlim Purpose Causes threads to wait at a specified point (called the barrier) until all threads arrive Raises a signal when a countdown completes A lightweight version of ManualResetEvent A lightweight version of Semaphore
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If you understand how to use the core synchronization classes described earlier, then you will have no trouble using these additions
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Terminating a Thread Via Abort( )
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It is sometimes useful to stop a thread prior to its normal conclusion, even when the new cancellation subsystem is used For example, a debugger may need to stop a thread that has run wild Once a thread has been terminated, it is removed from the system and cannot be restarted To terminate a thread prior to its normal conclusion, use ThreadAbort( ) Its simplest form is shown here: public void Abort( ) Abort( ) causes a ThreadAbortException to be thrown to the thread on which Abort( ) is called This exception causes the thread to terminate This exception can also be caught by your code (but is automatically rethrown in order to stop the thread) Abort( ) may not always be able to stop a thread immediately, so if it is important that a thread be stopped before your program continues, you will need to follow a call to Abort( ) with a call to Join( ) Also, in rare cases, it is possible that Abort( ) won t be able to stop a thread One way this could happen is if a finally block goes into an infinite loop The following example shows how to stop a thread by use of Abort( ):
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// Stopping a thread by use of Abort() using System; using SystemThreading; class MyThread { public Thread Thrd; public MyThread(string name) { Thrd = new Thread(thisRun); ThrdName = name; ThrdStart(); } // This is the entry point for thread void Run() { ConsoleWriteLine(ThrdName + " starting");
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23:
Multithreaded Programming, Part One
for(int i = 1; i <= 1000; i++) { ConsoleWrite(i + " "); if((i%10)==0) { ConsoleWriteLine(); ThreadSleep(250); } } ConsoleWriteLine(ThrdName + " exiting"); } } class StopDemo { static void Main() { MyThread mt1 = new MyThread("My Thread"); ThreadSleep(1000); // let child thread start executing ConsoleWriteLine("Stopping thread"); mt1ThrdAbort(); mt1ThrdJoin(); // wait for thread to terminate ConsoleWriteLine("Main thread terminating"); } }
PART II
The output from this program is shown here:
My Thread starting 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Stopping thread Main thread terminating
NOTE Abort( ) should not be used as the normal means of stopping a thread It is meant for
specialized situations Usually, a thread should end because its entry point method returns
An Abort( ) Alternative
You might find a second form of Abort( ) useful in some cases Its general form is shown here: public void Abort(object stateInfo) Here, stateInfo contains any information that you want to pass to the thread when it is being stopped This information is accessible through the ExceptionState property of ThreadAbortException You might use this to pass a termination code to a thread The following program demonstrates this form of Abort( ):
// Using Abort(object) using System; using SystemThreading;
Part II:
Exploring the C# Library
class MyThread { public Thread Thrd; public MyThread(string name) { Thrd = new Thread(thisRun); ThrdName = name; ThrdStart(); } // This is the entry point for thread void Run() { try { ConsoleWriteLine(ThrdName + " starting"); for(int i = 1; i <= 1000; i++) { ConsoleWrite(i + " "); if((i%10)==0) { ConsoleWriteLine(); ThreadSleep(250); } } ConsoleWriteLine(ThrdName + " exiting normally"); } catch(ThreadAbortException exc) { ConsoleWriteLine("Thread aborting, code is " + excExceptionState); } } } class UseAltAbort { static void Main() { MyThread mt1 = new MyThread("My Thread"); ThreadSleep(1000); // let child thread start executing ConsoleWriteLine("Stopping thread"); mt1ThrdAbort(100); mt1ThrdJoin(); // wait for thread to terminate ConsoleWriteLine("Main thread terminating"); } }
The output is shown here:
My Thread starting 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Stopping thread Thread aborting, code is 100 Main thread terminating
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