By Mark Walmsley PhD, BSc (auth.)
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Example text
2 The EVENT Class The EVENT class encapsulates the functionality of an event as supported by the operating system in order to hide the variations which occur between different implementations: class EVENT public: EVENT(int = TRUE); -EVENT (void) ; void Signal(void); void Wait(void); void Reset(void); int Test (void) ; } ; Events 49 The constructor takes a single boolean parameter to indicate whether the event is 'automatic' or 'manual' - by default an automatic event is created. The difference in the two types of event is how the Wai t () function affects the internal state of the event - the following figure illustrates the point signalled non-signalled ~ I ---- ---------------------- I I I .
The solution, of course, is to serialize the printing of the various greetings and the first step is to derive a new action class from the ATOMIC ACTION base class: HELLO ACTION : pub1ic ATOMIC_ACTION pub1ic: virtua1 void Execute(void*); a~ass }; The HELLO_ACTION class must provide a definition of the Execute () function: void HELLO_ACTION::Execute(void* param) char letter = (char) (1onq)param; printf("%c",letter); The action specified is to print a single character - the HELLO class Run ( ) function can now build a list of such actions into an atomic operation.
Now only one thread at a time can execute the code between the Acquire () and Release () calls - a portion of code bracketed in this way is sometimes referred to as a 'critical region' or 'critical section' but in this book the term 'mutex (protected code) block' is applied. Now if simultaneous calls to GetID () are made by threads A and B then whilst thread A is executing the code within the mutex block thread B must wait in the Acquire () function. A typical sequence of events might be as follows: thread A thread B store 0 increment Counter store 1 increment Counter return 1 return 0 There is still some degree of unpredictability but now one thread will always obtain the value 0, the other thread will always obtain the value 1 and the final value of the E:ounter variable will always be 2.