Initial source commit

minorGems/system/semaphoreTest.cpp

@@ -0,0 +1,115 @@
+/*
+ * Modification History
+ *
+ * 2001-January-11		Jason Rohrer
+ * Created.
+ *
+ * 2001-January-27		Jason Rohrer
+ * Made printing in threads thread-safe. 
+ */
+ 
+#include "BinarySemaphore.h"
+#include "Semaphore.h"
+#include "Thread.h"
+#include "ThreadSafePrinter.h"
+
+#include <stdio.h>
+
+/**
+ * Thread that waits on a semaphore.
+ *
+ * @author Jason Rohrer
+ */
+class WaitingThread : public Thread {
+	
+	public:
+
+		WaitingThread( int inID, Semaphore *inSemaphore );
+		
+		// override the run method from PThread
+		void run();
+	
+	private:
+		Semaphore *mSemaphore;
+		int mID;
+	};
+
+
+inline WaitingThread::WaitingThread( int inID, Semaphore *inSemaphore ) 
+	: mID( inID ), mSemaphore( inSemaphore ) {
+	
+	}
+
+
+inline void WaitingThread::run() {
+	for( int i=0; i<10; i++ ) {
+		ThreadSafePrinter::printf( "%d waiting for signal %d...\n", mID, i );
+		mSemaphore->wait();
+		ThreadSafePrinter::printf( "%d received signal %d.\n", mID, i );
+		}
+	}
+ 
+ 
+/**
+ * Thread that signals on a semaphore.
+ *
+ * @author Jason Rohrer
+ */
+class SignalingThread : public Thread {
+	
+	public:
+
+		SignalingThread( Semaphore *inSemaphore );
+		
+		// override the run method from PThread
+		void run();
+	
+	private:
+		Semaphore *mSemaphore;
+	
+	};
+
+
+inline SignalingThread::SignalingThread( Semaphore *inSemaphore ) 
+	: mSemaphore( inSemaphore ) {
+	
+	}
+
+
+inline void SignalingThread::run() {
+	for( int i=0; i<5; i++ ) {
+		sleep( 5000 ); 
+		ThreadSafePrinter::printf( "Signaling 20 times\n" );
+		for( int j=0; j<20; j++ ) {
+			mSemaphore->signal();
+			}
+		}
+	} 
+ 
+ 
+ 
+int main() {
+	int i;
+	Semaphore *semph = new Semaphore();
+
+	SignalingThread *threadS = new SignalingThread( semph );
+	
+	WaitingThread **threadW = new WaitingThread*[10];
+	for( i=0; i<10; i++ ) {
+		threadW[i] = new WaitingThread( i, semph );
+		threadW[i]->start();
+		}
+
+	threadS->start();
+	
+	for( i=0; i<10; i++ ) {
+		threadW[i]->join();
+		delete threadW[i];
+		}
+	threadS->join();
+
+	delete semph;
+	delete threadS;
+	delete [] threadW;	
+	return 0;
+	}