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// Use MethodImplAttribute to synchronize a method using System; using SystemThreading; using SystemRuntimeCompilerServices; // Rewrite of TickTock to use MethodImplOptionsSynchronized class TickTock { /* The following attribute synchronizes the entire Tick() method */ [MethodImplAttribute(MethodImplOptionsSynchronized)] public void Tick(bool running) { if(!running) { // stop the clock MonitorPulse(this); // notify any waiting threads return; } ConsoleWrite("Tick "); MonitorPulse(this); // let Tock() run MonitorWait(this); // wait for Tock() to complete }

/* The following attribute synchronizes the entire Tock() method */ [MethodImplAttribute(MethodImplOptionsSynchronized)] public void Tock(bool running) { if(!running) { // stop the clock MonitorPulse(this); // notify any waiting threads return; } ConsoleWriteLine("Tock"); MonitorPulse(this); // let Tick() run MonitorWait(this); // 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

Part II:

YOU TRY IT What is the slope of the line y = 2x + 8 YOU TRY IT What is the slope of the line y = 5 What is the slope of the line

void Run() { if(ThrdName == "Tick") { for(int i=0; i<5; i++) ttObTick(true); ttObTick(false); } else { for(int i=0; i<5; i++) ttObTock(true); ttObTock(false); } } } class TickingClock { static void Main() { TickTock tt = new TickTock(); MyThread mt1 = new MyThread("Tick", tt); MyThread mt2 = new MyThread("Tock", tt); mt1ThrdJoin(); mt2ThrdJoin(); ConsoleWriteLine("Clock Stopped"); } }

The proper Tick Tock output is the same as before As long as the method being synchronized is not defined by a public class or called on a public object, then whether you use lock or MethodImplAttribute is your decision Both produce the same results Because lock is a keyword built into C#, that is the approach the examples in this book will use

R EMEMBER Do not use MethodImplAttribute with public classes or public instances Instead,

In One, we discussed how acronyms impact readers perceptions about the formality or informality of your communications Acronyms and technical terminology need to be explained, de ned, or referenced unless 100 percent of your readers understand the jargon Keep in mind that even if most of your readers know what you mean, some might not Be sensitive to guests and newcomers Acronyms can be useful as shorthand, but they can be confusing to readers who aren t familiar with your terminology When in doubt, write it out The traditional way to handle acronyms is to write out the complete term, name, title, department, or phrase the rst time it s used, and then to indicate the acronym within parentheses Once you ve followed this format, you may con dently use only the acronym thereafter For example:

use lock, locking on a private object (as explained earlier)

x = 3

Although C# s lock statement is sufficient for many synchronization needs, some situations, such as restricting access to a shared resource, are sometimes more conveniently handled by other synchronization mechanisms built into the NET Framework The two described here are related to each other: mutexes and semaphores

A mutex is a mutually exclusive synchronization object This means it can be acquired by one and only one thread at a time The mutex is designed for those situations in which a shared resource can be used by only one thread at a time For example, imagine a log file that is shared by several processes, but only one process can write to that file at any one time A mutex is the perfect synchronization device to handle this situation The mutex is supported by the SystemThreadingMutex class It has several constructors Two commonly used ones are shown here: public Mutex( ) public Mutex(bool initiallyOwned)

23:

Two lines are perpendicular precisely when their slopes are negative reciprocals This makes sense: If one line has slope 5 and the other has slope 1/5 then we see that the first line rises 5 units for each unit of left-to-right motion while the second line falls 1 unit for each 5 units of left-to-right motion So the lines must be perpendicular See Figure 118a