Use our version of RWLOCKS on UNIXWARE 7

More DBUG info for replication
Better error messages from replication
Fixed bug in replication code when connecting to 'localhost' (time was not released properly)
Block ALARM signal on Linux for signal handler thread (Fixes problem with running mysqld with --debug)
Removed warning when setting an AUTO_INCREMENT field to NULL

sql/net_serv.cc

@@ -392,6 +392,9 @@ net_real_write(NET *net,const char *packet,ulong len)
 		    "%s: my_net_write: fcntl returned error %d, aborting thread\n",
 		    my_progname,vio_errno(net->vio));
 #endif /* EXTRA_DEBUG */
+#ifdef MYSQL_SERVER	    
+	    net->last_errno=ER_NET_ERROR_ON_WRITE;
+#endif
 	    net->error=2;                     /* Close socket */
 	    goto end;
 	  }