Added sharedSynchronization library

engine/shared/library/sharedSynchronization/src/linux/InterlockedInteger.h

@@ -0,0 +1,63 @@
+// ======================================================================
+//
+// InterlockedInteger.h
+// Acy Stapp
+//
+// Copyright 6/19/2001 Sony Online Entertainment
+//
+// ======================================================================
+
+#ifndef INCLUDED_InterlockedInteger_h
+#define INCLUDED_InterlockedInteger_h
+
+// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+class InterlockedInteger
+{
+public:
+	explicit InterlockedInteger(int initialValue=0);
+	int operator =(int); // returns prior value (exchange)
+	int operator ++(); // returns new value
+	int operator --(); // returns new value
+	operator int() const { return value; }
+private:
+	InterlockedInteger(const InterlockedInteger &o);
+	InterlockedInteger &operator =(const InterlockedInteger &o);
+	pthread_mutex_t lock;
+	volatile int value;
+};
+
+inline InterlockedInteger::InterlockedInteger(int i_value)
+: value(i_value)
+{
+  pthread_mutex_init(&lock, 0);
+}
+
+inline int InterlockedInteger::operator =(int i_value)
+{
+	pthread_mutex_lock(&lock);
+	int oldvalue = value;
+	value = i_value;
+	pthread_mutex_unlock(&lock);
+	return oldvalue;
+}
+
+inline int InterlockedInteger::operator ++()
+{
+	pthread_mutex_lock(&lock);
+	int newvalue = value+1;
+	value = newvalue;
+	pthread_mutex_unlock(&lock);
+	return newvalue;
+}
+
+inline int InterlockedInteger::operator --()
+{
+	pthread_mutex_lock(&lock);
+	int newvalue = value-1;
+	value = newvalue;
+	pthread_mutex_unlock(&lock);
+	return newvalue;
+}
+
+#endif