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Synchronization issues are some of the hardest problems to locate and debug This is because the errors they create are often rare and almost impossible to reproduce You therefore have to do all your thread synchronization debugging by pure thought To give you an idea of how to do it, I ll go over using the synchronized keyword in this example program and suggest how to keep your program thread safe This section will contain nothing new for experienced Java programmers, but because keeping your program thread safe is at once tricky and important, I ll include this material for those readers who are new to it Recall the basics of how synchronization works: each instance of an object has a lock, and each class has a lock for its static methods Suppose the instance is called myObject.

#define #define #define #define #define #define #define #define #define #define #define #define #define

Note If you find yourself having any issue during installation, or for that matter any issues with Enterprise

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If a thread enters a method for that instance marked with the synchronized keyword or if the thread enters a block of code contained in a block delineated by synchronized(myObject), then the thread picks up the instance s lock If one thread is holding the lock for a particular instance, no other thread can enter any method or synchronized block for that particular instance until the thread currently holding the lock exits the synchronized method or block This is a means of preventing race conditions in which two or more threads are at risk of modifying and/or acting on the values of data simultaneously Clearly there are going to be problems if one thread completes the phrase if(x == y) and then another thread changes the value of x before the first thread executes all the statements in the if block.

Deploying Enterprise Library 3.0 in production environments can easily be accomplished with Xcopy deployment techniques, even in low-level privilege environments such as ASP .NET applications. ClickOnce is another viable option for Enterprise Library distribution. Of course, if you want a pretty install package, you can still create an MSI project in Visual Studio 2005 and add Enterprise Library as one of the dependencies for your application as you would any other installation dependency.

(25) (50) (80) (100) 0 1 2 3 4 5 6 7 8

Now that all the necessary software including Visual Studio 2005 and Enterprise Library have been installed on your machine, it will help to download and compile the ACME Cosmetics Point-of-Sales Application source code to follow along with the samples in this book. The samples within the book will not always contain all the code necessary to make a particular component compile. Hence, without the source code, trying and testing the samples will be difficult.

#define MODE0 0 #define MODE1 1 sub ShowCommands(byte Lcmd, byte Rcmd, byte triggers) { [...] } // this function converts the received command // opcode into the corresponding motor speed short DecodeSpeed(short cmd) { if ( cmd == STOP ) return 0; if ( cmd == FWD1 ) return SPEED1; if ( cmd == FWD2 ) return SPEED2; if ( cmd == FWD3 ) return SPEED3; if ( cmd == FWD4 ) return SPEED4; if ( cmd == REV1 ) return -SPEED1; if ( cmd == REV2 ) return -SPEED2; if ( cmd == REV3 ) return -SPEED3; if ( cmd == REV4 ) return -SPEED4; } // this function converts the received command // opcode into the corresponding direction. // This is handy for using joysticks as one-shot digital controls short DecodeDir(short cmd) { if ( cmd == STOP ) return 0; if ( cmd == FWD1 ) return 1; if ( cmd == FWD2 ) return 1; if ( cmd == FWD3 ) return 1;

Obviously, the problem arises when two or more threads are using the same data at the same time and at least one of those threads might modify that data A naive solution is to use the synchronized keyword on every method that reads or modifies data That would force all the threads to take turns using data-related methods But that strategy would almost certainly lead to frequent deadlock, which is when two threads get stuck because each one is waiting for the other to give up a lock The best strategy is to analyze each class, method by method, to see where synchronization is needed and where it isn t That s not as terrible as it sounds since it becomes second nature once you re used to doing it.

Note You can find the current source for the ACME Cosmetics Point-of-Sales Application on the Apress

website (http://www.apress.com).

if if if if if }

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