Added optional "timeout" feature to MemoryPoW.compute2(), to give up after a specified amount of time.

src/main/java/org/qortal/crypto/MemoryPoW.java

@@ -1,10 +1,25 @@
 package org.qortal.crypto;
 
+import org.qortal.utils.NTP;
+
 import java.nio.ByteBuffer;
+import java.util.concurrent.TimeoutException;
 
 public class MemoryPoW {
 
 	public static Integer compute2(byte[] data, int workBufferLength, long difficulty) {
+		try {
+			return MemoryPoW.compute2(data, workBufferLength, difficulty, null);
+
+		} catch (TimeoutException e) {
+			// This won't happen, because above timeout is null
+			return null;
+		}
+	}
+
+	public static Integer compute2(byte[] data, int workBufferLength, long difficulty, Long timeout) throws TimeoutException {
+		long startTime = NTP.getTime();
+
 		// Hash data with SHA256
 		byte[] hash = Crypto.digest(data);
 
@@ -33,6 +48,13 @@ public class MemoryPoW {
 			if (Thread.currentThread().isInterrupted())
 				return -1;
 
+			if (timeout != null) {
+				long now = NTP.getTime();
+				if (now > startTime + timeout) {
+					throw new TimeoutException("Timeout reached");
+				}
+			}
+
 			seed *= seedMultiplier; // per nonce
 
 			state[0] = longHash[0] ^ seed;