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diff --git a/gnuradio-core/src/lib/io/gri_logger.h b/gnuradio-core/src/lib/io/gri_logger.h
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+++ b/gnuradio-core/src/lib/io/gri_logger.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2006 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+#ifndef INCLUDED_GRI_LOGGER_H
+#define INCLUDED_GRI_LOGGER_H
+
+#include <stddef.h>
+#include <omnithread.h>
+#include <gr_buffer.h>
+
+class gri_log_poster;
+class gri_logger;
+typedef boost::shared_ptr<gri_logger> gri_logger_sptr;
+
+
+/*!
+ * \brief non-blocking logging to a file.
+ *
+ * In reality, this may block, but only for a bounded time.
+ * Trust me, it's safe to use from portaudio and JACK callbacks.
+ */
+class gri_logger
+{
+  gri_log_poster	*d_poster;
+  omni_mutex		 d_write_mutex;
+
+public:
+  static gri_logger_sptr singleton();
+
+  gri_logger(const char *filename);
+  ~gri_logger();
+
+  void write(const void *buf, size_t count);
+  void printf(const char *format, ...);
+};
+
+#endif /* INCLUDED_GRI_LOGGER_H */