using System;
using System.Threading;

public class InterlockTest
{
	public int test;
	public int add;
	public int rem;

	static int s_test;
	
	public static int Main() {
		int a,b;

		InterlockTest it = new InterlockTest ();

		it.test = 0;
		int c = Interlocked.Exchange (ref it.test, 1);
		if (c != 0)
			return 1;

		if (it.test != 1)
			return 2;

		it.test = -2;
		c = Interlocked.CompareExchange (ref it.test, 1, -2);
		if (c != -2)
			return 3;

		if (it.test != 1)
			return 4;

		a = 10;
		c = Interlocked.Exchange (ref a, 5);
		if (c != 10)
			return 5;
		if (a != 5)
			return 5;

		a = 1;
		b = Interlocked.Increment (ref a);
		if (a != 2)
			return 5;
		if (b != 2)
			return 6;

		a = 2;
		b = Interlocked.Decrement (ref a);
		if (b != 1)
			return 7;
		if (a != 1)
			return 8;

		string s = IncTest ();
		if (s != "A1")
			return 9;

		s = IncTest ();
		if (s != "A2")
			return 10;

		Thread.MemoryBarrier ();

		interlocked_regalloc1 ();

		Console.WriteLine ("done!");

		return 0;
	}

	public static object[] buckets;
	public static object segmentCache;

	public static int interlocked_regalloc1 () {
	   int segment = 0;
	   buckets = new object [10];

	   if (buckets[segment] == null) {
		   object newSegment = new Object ();
		   segmentCache = Interlocked.CompareExchange (ref buckets[segment], newSegment, null) == null ? null : newSegment;
	   }
	   return 0;
	}

	public static string IncTest () {
		return "A" + Interlocked.Increment (ref s_test);
	}
}