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There are a number of ways to create and start a thread This section describes the basic mechanism Various options are described later in this chapter To create a thread, instantiate an object of type Thread, which is a class defined in SystemThreading The simplest Thread constructor is shown here: public Thread(ThreadStart start) Here, start specifies the method that will be called to begin execution of the thread In other words, it specifies the thread s entry point ThreadStart is a delegate defined by the NET Framework as shown here: public delegate void ThreadStart( ) Thus, your entry point method must have a void return type and take no arguments Once created, the new thread will not start running until you call its Start( ) method, which is defined by Thread The Start( ) method has two forms The one used here is public void Start( ) Once started, the thread will run until the entry point method returns Thus, when the thread s entry point method returns, the thread automatically stops If you try to call Start( ) on a thread that has already been started, a ThreadStateException will be thrown Here is an example that creates a new thread and starts it running:

// Create a thread of execution using System; using SystemThreading; class MyThread { public int Count; string thrdName; public MyThread(string name) { Count = 0; thrdName = name; }

Part II:

// Entry point of thread public void Run() { ConsoleWriteLine(thrdName + " starting"); do { ThreadSleep(500); ConsoleWriteLine("In " + thrdName + ", Count is " + Count); Count++; } while(Count < 10); ConsoleWriteLine(thrdName + " terminating"); } } class MultiThread { static void Main() { ConsoleWriteLine("Main thread starting"); // First, construct a MyThread object MyThread mt = new MyThread("Child #1"); // Next, construct a thread from that object Thread newThrd = new Thread(mtRun); // Finally, start execution of the thread newThrdStart(); do { ConsoleWrite(""); ThreadSleep(100); } while (mtCount != 10); ConsoleWriteLine("Main thread ending"); } }

mean (in terms of the natural logarithm func-

Let s look closely at this program MyThread defines a class that will be used to create a second thread of execution Inside its Run( ) method, a loop is established that counts from 0 to 9 Notice the call to Sleep( ), which is a static method defined by Thread The Sleep( ) method causes the thread from which it is called to suspend execution for the specified period of milliseconds The form used by the program is shown here: public static void Sleep(int millisecondsTimeout) The number of milliseconds to suspend is specified in millisecondsTimeout If millisecondsTimeout is zero, the calling thread is suspended only to allow a waiting thread to execute Inside Main( ), a new Thread object is created by the following sequence of statements:

// First, construct a MyThread object MyThread mt = new MyThread("Child #1"); // Next, construct a thread from that object Thread newThrd = new Thread(mtRun);

If your readers have to study your communications to understand your message, you re slowing them down and making them work unnecessarily hard Reader confusion often results from a lack of writer preparation However, even when you ve followed the steps outlined in this book, you might leave your readers confused because of two speci c issues: 1 misplaced or misused modi ers 2 unexplained acronyms or technical jargon Selecting and positioning modifying words and phrases correctly and defining all terminology that may be unfamiliar to your readers will help ensure clarity in your communications

23:

Simplify the expression ( log4 9) ( log9 16)

// Finally, start execution of the thread newThrdStart();

As the comments suggest, first an object of MyThread is created This object is then used to construct a Thread object by passing the mtRun( ) method as the entry point Finally, execution of the new thread is started by calling Start( ) This causes mtRun( ) to begin executing in its own thread After calling Start( ), execution of the main thread returns to Main( ), and it enters Main( ) s do loop Both threads continue running, sharing the CPU, until their loops finish The output produced by this program is as follows (The precise output that you see may vary slightly because of differences in your execution environment, operating system, and task load)