diff --git a/Makefile b/Makefile
index 06885e8..7af948d 100644
--- a/Makefile
+++ b/Makefile
@@ -1,16 +1,16 @@
-#CC=cc
-CFLAGS=-g -Wall
-#CFLAGS=-O2 -Wall
-RANLIB=ranlib
-
 INCLUDES=-I.
 VNCSERVERLIB=-L. -lvncserver -L/usr/local/lib -lz -ljpeg
 
-# These two lines enable useage of PThreads
-CFLAGS += -DHAVE_PTHREADS
-VNCSERVERLIB += -lpthread
+# Uncomment these two lines to enable use of PThreads
+PTHREADDEF = -DHAVE_PTHREADS
+PTHREADLIB = -lpthread
+
+#CC=cc
+CFLAGS=-g -Wall $(PTHREADDEF)
+#CFLAGS=-O2 -Wall
+RANLIB=ranlib
 
-LIBS=$(LDFLAGS) $(VNCSERVERLIB)
+LIBS=$(LDFLAGS) $(VNCSERVERLIB) $(PTHREADLIB)
 
 # for Mac OS X
 OSX_LIBS = -framework ApplicationServices -framework Carbon
diff --git a/cursor.c b/cursor.c
index 39346b9..c86e377 100644
--- a/cursor.c
+++ b/cursor.c
@@ -337,19 +337,38 @@ void rfbUndrawCursor(rfbClientPtr cl)
    rfbCursorPtr c=s->cursor;
    int j,x1,x2,y1,y2,bpp=s->rfbServerFormat.bitsPerPixel/8,
      rowstride=s->paddedWidthInBytes;
-   if(!s->cursorIsDrawn)
+
+#ifdef HAVE_PTHREADS
+   pthread_mutex_lock(&c->mutex);
+#endif
+   if(!s->cursorIsDrawn) {
+#ifdef HAVE_PTHREADS
+     pthread_mutex_unlock(&c->mutex);
+#endif
      return;
+   }
+   
    /* restore what is under the cursor */
    x1=s->cursorX-c->xhot;
    x2=x1+c->width;
    if(x1<0) x1=0;
    if(x2>=s->width) x2=s->width-1;
-   x2-=x1; if(x2<=0) return;
+   x2-=x1; if(x2<=0) {
+#ifdef HAVE_PTHREADS
+     pthread_mutex_unlock(&c->mutex);
+#endif
+     return;
+   }
    y1=s->cursorY-c->yhot;
    y2=y1+c->height;
    if(y1<0) y1=0;
    if(y2>=s->height) y2=s->height-1;
-   y2-=y1; if(y2<=0) return;
+   y2-=y1; if(y2<=0) {
+#ifdef HAVE_PTHREADS
+     pthread_mutex_unlock(&c->mutex);
+#endif
+     return;
+   }
    for(j=0;j<y2;j++)
      memcpy(s->frameBuffer+(y1+j)*rowstride+x1*bpp,
 	    s->underCursorBuffer+j*x2*bpp,
@@ -357,6 +376,9 @@ void rfbUndrawCursor(rfbClientPtr cl)
    
    rfbMarkRectAsModified(s,x1,y1,x1+x2,y1+y2);
    s->cursorIsDrawn = FALSE;
+#ifdef HAVE_PTHREADS
+   pthread_mutex_unlock(&c->mutex);
+#endif
 }
 
 void rfbDrawCursor(rfbClientPtr cl)
@@ -367,10 +389,18 @@ void rfbDrawCursor(rfbClientPtr cl)
      rowstride=s->paddedWidthInBytes,
      bufSize,w;
    if(!c) return;
+#ifdef HAVE_PTHREADS
+   pthread_mutex_lock(&c->mutex);
+#endif
+   if(s->cursorIsDrawn) {
+     /* is already drawn */
+#ifdef HAVE_PTHREADS
+     pthread_mutex_unlock(&c->mutex);
+#endif
+     return;
+   }
    bufSize=c->width*c->height*bpp;
    w=(c->width+7)/8;
-   if(s->cursorIsDrawn)
-     rfbUndrawCursor(cl);
    if(s->underCursorBufferLen<bufSize) {
       if(s->underCursorBuffer!=NULL)
 	free(s->underCursorBuffer);
@@ -383,12 +413,22 @@ void rfbDrawCursor(rfbClientPtr cl)
    x2=x1+c->width;
    if(x1<0) { i1=-x1; x1=0; }
    if(x2>=s->width) x2=s->width-1;
-   x2-=x1; if(x2<=0) return; /* nothing to do */
+   x2-=x1; if(x2<=0) {
+#ifdef HAVE_PTHREADS
+     pthread_mutex_unlock(&c->mutex);
+#endif
+     return; /* nothing to do */
+   }
    y1=s->cursorY-c->yhot;
    y2=y1+c->height;
    if(y1<0) { j1=-y1; y1=0; }
    if(y2>=s->height) y2=s->height-1;
-   y2-=y1; if(y2<=0) return; /* nothing to do */
+   y2-=y1; if(y2<=0) {
+#ifdef HAVE_PTHREADS
+     pthread_mutex_unlock(&c->mutex);
+#endif
+     return; /* nothing to do */
+   }
    for(j=0;j<y2;j++)
      memcpy(s->underCursorBuffer+j*x2*bpp,
 	    s->frameBuffer+(y1+j)*rowstride+x1*bpp,
@@ -406,6 +446,9 @@ void rfbDrawCursor(rfbClientPtr cl)
 
    rfbMarkRectAsModified(s,x1,y1,x1+x2,y1+y2);
    s->cursorIsDrawn = TRUE;
+#ifdef HAVE_PTHREADS
+   pthread_mutex_unlock(&c->mutex);
+#endif
 }
 
 /* for debugging */
diff --git a/main.c b/main.c
index 54ad19a..d547a8c 100644
--- a/main.c
+++ b/main.c
@@ -72,10 +72,15 @@ void rfbMarkRegionAsModified(rfbScreenInfoPtr rfbScreen,sraRegionPtr modRegion)
 {
    rfbClientIteratorPtr iterator;
    rfbClientPtr cl;
+   
    iterator=rfbGetClientIterator(rfbScreen);
-   while((cl=rfbClientIteratorNext(iterator)))
+   while((cl=rfbClientIteratorNext(iterator))) {
+     pthread_mutex_lock(&cl->updateMutex);
      sraRgnOr(cl->modifiedRegion,modRegion);
-  
+     pthread_cond_signal(&cl->updateCond);
+     pthread_mutex_unlock(&cl->updateMutex);
+   }
+
    rfbReleaseClientIterator(iterator);
 }
 
@@ -98,7 +103,7 @@ void rfbMarkRectAsModified(rfbScreenInfoPtr rfbScreen,int x1,int y1,int x2,int y
    sraRgnDestroy(region);
 }
 
-int rfbDeferUpdateTime = 40; /* ms */
+int rfbDeferUpdateTime = 400; /* ms */
 
 #ifdef HAVE_PTHREADS
 static void *
@@ -180,37 +185,14 @@ void*
 listenerRun(void *data)
 {
     rfbScreenInfoPtr rfbScreen=(rfbScreenInfoPtr)data;
-    int listen_fd, client_fd;
-    struct sockaddr_in sin, peer;
+    int client_fd;
+    struct sockaddr_in peer;
     pthread_t client_thread;
     rfbClientPtr cl;
-    int len, value;
-
-    sin.sin_family = AF_INET;
-    sin.sin_addr.s_addr = INADDR_ANY;
-    sin.sin_port = htons(rfbScreen->rfbPort ? rfbScreen->rfbPort : 5901);
-
-    if ((listen_fd = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
-        return NULL;
-    }
-    value = 1;
-    if (setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, 
-                   &value, sizeof(value)) < 0) {
-        rfbLog("setsockopt SO_REUSEADDR failed\n");
-    }
-                                                                   
-    if (bind(listen_fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
-        rfbLog("failed to bind socket\n");
-        exit(1);
-    }
-
-    if (listen(listen_fd, 5) < 0) {
-        rfbLog("listen failed\n");
-        exit(1);
-    }
+    int len;
 
     len = sizeof(peer);
-    while ((client_fd = accept(listen_fd, 
+    while ((client_fd = accept(rfbScreen->rfbListenSock, 
                                (struct sockaddr *)&peer, &len)) >= 0) {
         cl = rfbNewClient(rfbScreen,client_fd);
 
diff --git a/rfb.h b/rfb.h
index 2864adf..8842de4 100644
--- a/rfb.h
+++ b/rfb.h
@@ -599,6 +599,9 @@ typedef struct rfbCursor {
     unsigned short foreRed, foreGreen, foreBlue; /* device-independent color */
     unsigned short backRed, backGreen, backBlue; /* device-independent color */
     unsigned char *richSource; /* source bytes for a rich cursor */
+#ifdef HAVE_PTHREADS
+    pthread_mutex_t mutex;
+#endif
 } rfbCursor, *rfbCursorPtr;
 
 extern Bool rfbSendCursorShape(rfbClientPtr cl/*, rfbScreenInfoPtr pScreen*/);
diff --git a/rfbserver.c b/rfbserver.c
index 64fa670..2d68e08 100644
--- a/rfbserver.c
+++ b/rfbserver.c
@@ -260,7 +260,10 @@ rfbClientConnectionGone(cl)
      rfbClientPtr cl;
 {
     int i;
+
 #ifdef HAVE_PTHREADS
+    pthread_mutex_lock(&cl->updateMutex);
+    pthread_mutex_lock(&cl->outputMutex);
     pthread_mutex_lock(&rfbClientListMutex);
 #endif
 
@@ -289,16 +292,16 @@ rfbClientConnectionGone(cl)
     if (cl->next)
         cl->next->prev = cl->prev;
 
-#ifdef HAVE_PTHREADS
-    pthread_mutex_unlock(&rfbClientListMutex);
-#endif
-
     sraRgnDestroy(cl->modifiedRegion);
 
     rfbPrintStats(cl);
 
     if (cl->translateLookupTable) free(cl->translateLookupTable);
 
+#ifdef HAVE_PTHREADS
+    pthread_mutex_unlock(&rfbClientListMutex);
+#endif
+
 #ifdef HAVE_PTHREADS
     pthread_cond_destroy(&cl->updateCond);
     pthread_mutex_destroy(&cl->updateMutex);
@@ -839,8 +842,9 @@ rfbSendFramebufferUpdate(cl, updateRegion)
       if (!cl->screen->cursorIsDrawn && cl->cursorWasChanged)
 	sendCursorShape = TRUE;
     } else {
-      if (!cl->screen->cursorIsDrawn)
+      if (!cl->screen->cursorIsDrawn) {
 	rfbDrawCursor(cl);
+      }
     }
    
     /*
diff --git a/sockets.c b/sockets.c
index fe20c49..9721110 100644
--- a/sockets.c
+++ b/sockets.c
@@ -252,10 +252,14 @@ void
 rfbCloseClient(cl)
      rfbClientPtr cl;
 {
+    pthread_mutex_lock(&cl->updateMutex);
     FD_CLR(cl->sock,&(cl->screen->allFds));
-    rfbClientConnectionGone(cl);
     close(cl->sock);
     cl->sock = -1;
+    pthread_cond_signal(&cl->updateCond);
+    pthread_mutex_lock(&cl->updateMutex);
+    rfbClientConnectionGone(cl);
+    pthread_mutex_unlock(&cl->updateMutex);
 }