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using System; using SystemThreading; class MyThread { public int Count; string thrdName; public MyThread(string name) { Count = 0; thrdName = name; } // 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("");
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ThreadSleep(100); } while (mtCount != 10); ConsoleWriteLine("Main thread ending"); } }
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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 When a thread suspends, another thread can run The form used by the program is shown here: public static void Sleep(int milliseconds) The number of milliseconds to suspend is specified in milliseconds If milliseconds 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:
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// 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();
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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)
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Main thread starting Child #1 starting In Child #1, Count In Child #1, Count In Child #1, Count In Child #1, Count In Child #1, Count In Child #1, Count In Child #1, Count In Child #1, Count In Child #1, Count In Child #1, Count Child #1 terminating Main thread ending
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Often in a multithreaded program, you will want the main thread to be the last thread to finish running Technically, a program continues to run until all of its foreground threads
23:
Multithreaded Programming
have finished Thus, having the main thread finish last is not a requirement It is, however, often good practice to follow because it clearly defines your program s endpoint The preceding program tries to ensure that the main thread will finish last, by checking the value of Count within Main( ) s do loop, stopping when Count equals 10, and through the use of calls to Sleep( ) However, this is an imperfect approach Later in this chapter, you will see better ways for one thread to wait until another finishes
Some Simple Improvements
While the preceding program is perfectly valid, some easy improvements will make it more efficient First, it is possible to have a thread begin execution as soon as it is created In the case of MyThread, this is done by instantiating a Thread object inside MyThread s constructor Second, there is no need for MyThread to store the name of the thread since Thread defines a property called Name that can be used for this purpose Name is defined like this: public string Name { get; set; } Since Name is a read-write property, you can use it to set the name of a thread or to retrieve the thread s name Here is a version of the preceding program that makes these three improvements:
// An alternate way to start a thread using System; using SystemThreading; class MyThread { public int Count; public Thread Thrd; public MyThread(string name) { Count = 0; Thrd = new Thread(thisRun); ThrdName = name; // set the name of the thread ThrdStart(); // start the thread } // Entry point of thread void Run() { ConsoleWriteLine(ThrdName + " starting"); do { ThreadSleep(500); ConsoleWriteLine("In " + ThrdName + ", Count is " + Count); Count++; } while(Count < 10); ConsoleWriteLine(ThrdName + " terminating"); } } class MultiThreadImproved { static void Main() {
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