C # demonstration of multi-thread Competition

Using system; <br/> using system. collections. generic; <br/> using system. LINQ; <br/> using system. text; <br/> using system. diagnostics; <br/> using system. threading; </P> <p> namespace multithreading <br/> {<br/> demonstration of class competing states <br/>{< br/> Public static void main () <br/>{< br/> stateobject state = new stateobject (); </P> <p> // start 20 threads, shared operation state object <br/> for (INT I = 0; I <20; I ++) <br/> {<br/> thread t = new t Hread (New samplethread (). racecondition); <br/> T. name = I. tostring (); <br/> T. start (State); <br/>}</P> <p> // The result shows that the frequency is not equal to 6. <Br/> // The reason is that after a thread executes if (State = 5), the thread does not have time to execute the command downward and is under control by other threads. <Br/> // when it is the second turn of this thread, the state has changed to 7, so there is a race state problem .. Use assertions to display <br/>}</P> <p> class stateobject <br/>{< br/> private int state = 5; </P> <p> Public void changestate (INT loop) <br/> {<br/> If (State = 5) <br/> {<br/> state ++; <br/> // if the value is not 6, execute the asserted display. <br/> trace. assert (State = 6, "the result is not 6 and appears in" + loop + "thread name:" + thread. currentthread. name); <br/>}</P> <p> state = 5; <br/>}</P> <p> class samplethread <br/>{< br/> Public void racecondition (Object O) <br/>{< br/> trace. assert (O is stateobject, "the input parameter must be of the stateobject type"); <br/> stateobject state = O as stateobject; </P> <p> int I = 0; <br/> while (true) <br/>{< br/> state. changestate (I ++); <br/>}</P> <p >}< br/>