* Fixed race that (maybe) caused the problems reported by aum on

<http://dev.i2p.net/pipermail/i2p/2004-April/000214.html>;
* slightly revised locking;
* made accept() throw a ConnectException when the I2PServerSocket is closed.
(human)

apps/ministreaming/java/src/net/i2p/client/streaming/I2PServerSocket.java

@@ -1,5 +1,7 @@
 package net.i2p.client.streaming;
 
+import java.net.ConnectException;
+
 import net.i2p.I2PException;
 
 /**
@@ -17,10 +19,13 @@ public interface I2PServerSocket {
      * connection and the local application wasn't .accept()ing new connections,
      * they should get refused (if .accept() doesnt occur in some small period)
      *
+     * @return a connected I2PSocket
+     *
      * @throws I2PException if there is a problem with reading a new socket
      *         from the data available (aka the I2PSession closed, etc)
+     * @throws ConnectException if the I2PServerSocket is closed
      */
-    public I2PSocket accept() throws I2PException;
+    public I2PSocket accept() throws I2PException, ConnectException;
 
     /**
      * Access the manager which is coordinating the server socket

apps/ministreaming/java/src/net/i2p/client/streaming/I2PServerSocketImpl.java

@@ -1,5 +1,7 @@
 package net.i2p.client.streaming;
 
+import java.net.ConnectException;
+
 import net.i2p.I2PException;
 import net.i2p.util.Log;
 
@@ -12,42 +14,61 @@ class I2PServerSocketImpl implements I2PServerSocket {
     private I2PSocketManager mgr;
     private I2PSocket cached = null; // buffer one socket here
 
+    private boolean closing = false; // Are we being closed?
+
+    private Object acceptLock = new Object();
+
     public I2PServerSocketImpl(I2PSocketManager mgr) {
         this.mgr = mgr;
     }
 
-    public synchronized I2PSocket accept() throws I2PException {
-        while (cached == null) {
+    public synchronized I2PSocket accept() throws I2PException, ConnectException {
+	I2PSocket ret;
+	
+	synchronized (acceptLock) {
+	    while ((cached == null) && !closing) {
 		myWait();
 	    }
-        I2PSocket ret = cached;
+
+	    if (closing) {
+		throw new ConnectException("I2PServerSocket closed");
+	    }
+
+	    ret = cached;
 	    cached = null;
-        notifyAll();
+	    acceptLock.notifyAll();
+	}
+	
         _log.debug("TIMING: handed out accept result " + ret.hashCode());
         return ret;
     }
 
-    public synchronized boolean getNewSocket(I2PSocket s) {
+    public boolean getNewSocket(I2PSocket s) {
+	synchronized (acceptLock) {
 	    while (cached != null) {
 		myWait();
 	    }
 	    cached = s;
-        notifyAll();
+	    acceptLock.notifyAll();
+	}
+
         return true;
     }
 
     public void close() throws I2PException {
-        //noop
-    }
-
-    private void myWait() {
-        try {
-            wait();
-        } catch (InterruptedException ex) {
+	synchronized (acceptLock) {
+	    closing = true;
+	    acceptLock.notifyAll();
 	}
     }
 
     public I2PSocketManager getManager() {
         return mgr;
     }
+
+    private void myWait() {
+	try {
+	    acceptLock.wait();
+	} catch (InterruptedException ex) {}
+    }
 }