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It returns true if the calling thread obtains a lock on obj and false if it doesn t In no case does the calling thread wait You could use this method to implement an alternative if the desired object is unavailable Monitor also defines these three methods: Wait( ), Pulse( ), and PulseAll( ) They are described in the next section
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Thread Communication Using Wait( ), Pulse( ), and PulseAll( )
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Consider the following situation A thread called T is executing inside a lock block and needs access to a resource, called R, that is temporarily unavailable What should T do If T enters some form of polling loop that waits for R, then T ties up the lock, blocking other threads access to it This is a less than optimal solution because it partially defeats the advantages of programming for a multithreaded environment A better solution is to have T temporarily relinquish the lock, allowing another thread to run When R becomes available, T can be notified and resume execution Such an approach relies upon some form of interthread communication in which one thread can notify another that it is blocked and be notified when it can resume execution C# supports interthread communication with the Wait( ), Pulse( ), and PulseAll( ) methods The Wait( ), Pulse( ), and PulseAll( ) methods are defined by the Monitor class These methods can be called only from within a locked block of code Here is how they are used When a thread is temporarily blocked from running, it calls Wait( ) This causes the thread to go to sleep and the lock for that object to be released, allowing another thread to acquire the lock At a later point, the sleeping thread is awakened when some other thread enters the same lock and calls Pulse( ) or PulseAll( ) A call to Pulse( ) resumes the first thread in the queue of threads waiting for the lock A call to PulseAll( ) signals the release of the lock to all waiting threads Here are two commonly used forms of Wait( ): public static bool Wait(object obj) public static bool Wait(object obj, int millisecondsTimeout) The first form waits until notified The second form waits until notified or until the specified period of milliseconds has expired For both, obj specifies the object upon which to wait Here are the general forms for Pulse( ) and PulseAll( ): public static void Pulse(object obj) public static void PulseAll(object obj) Here, obj is the object being released A SynchronizationLockException will be thrown if Wait( ), Pulse( ), or PulseAll( ) is called from code that is not within synchronized code, such as a lock block
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An Example That Uses Wait( ) and Pulse( )
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To understand the need for and the application of Wait( ) and Pulse( ), we will create a program that simulates the ticking of a clock by displaying the words Tick and Tock on the screen To accomplish this, we will create a class called TickTock that contains two methods: Tick( ) and Tock( ) The Tick( ) method displays the word Tick and Tock( ) displays Tock To run the clock, two threads are created, one that calls Tick( ) and one that calls Tock( ) The goal is to make the two threads execute in a way that the output from the
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program displays a consistent Tick Tock that is, a repeated pattern of one Tick followed by one Tock
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// Use Wait() and Pulse() to create a ticking clock using System; using SystemThreading; class TickTock { object lockOn = new object(); public void Tick(bool running) { lock(lockOn) { if(!running) { // stop the clock MonitorPulse(lockOn); // notify any waiting threads return; } ConsoleWrite("Tick "); MonitorPulse(lockOn); // let Tock() run MonitorWait(lockOn); // wait for Tock() to complete } } public void Tock(bool running) { lock(lockOn) { if(!running) { // stop the clock MonitorPulse(lockOn); // notify any waiting threads return; } ConsoleWriteLine("Tock"); MonitorPulse(lockOn); // let Tick() run MonitorWait(lockOn); // wait for Tick() to complete } } } class MyThread { public Thread Thrd; TickTock ttOb; // Construct a new thread public MyThread(string name, TickTock tt) { Thrd = new Thread(thisRun); ttOb = tt; ThrdName = name; ThrdStart(); } // Begin execution of new thread void Run() {
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