Merged r9433:9527 from features/gr-usrp2 into trunk. Adds usrp2 and gr-usrp2 top...

[debian/gnuradio] / usrp2 / host / lib / ring.h

diff --git a/usrp2/host/lib/ring.h b/usrp2/host/lib/ring.h
new file mode 100644 (file)
index 0000000..2f4346c
--- /dev/null
+++ b/usrp2/host/lib/ring.h
@@ -0,0 +1,83 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2008 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 3, 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 this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#ifndef INCLUDED_RING_H
+#define INCLUDED_RING_H
+
+#include <omnithread.h>
+#include <stddef.h>
+#include <vector>
+#include <boost/shared_ptr.hpp>
+
+namespace usrp2 {
+
+  class ring;
+  typedef boost::shared_ptr<ring> ring_sptr;
+
+  class ring
+  {
+  private:
+ 
+    size_t d_max;
+    size_t d_read_ind;
+    size_t d_write_ind;
+
+    struct ring_desc
+    {
+      void *d_base;
+      size_t d_len;
+    };
+    std::vector<ring_desc> d_ring;
+
+    omni_mutex d_mutex;
+    omni_condition d_not_empty;
+
+    void inc_read_ind()
+    {
+      if (d_read_ind + 1 >= d_max)
+       d_read_ind = 0;
+      else
+       d_read_ind = d_read_ind + 1;
+    }
+
+    void inc_write_ind()
+    {
+      if (d_write_ind + 1 >= d_max)
+       d_write_ind = 0;
+      else
+       d_write_ind = d_write_ind + 1;
+    }
+        
+    bool empty() const { return d_read_ind == d_write_ind; }
+    bool full() const { return (d_write_ind+1)%d_max == d_read_ind; }
+
+  public:
+    
+    ring(unsigned int entries);
+
+    void wait_for_not_empty();
+
+    bool enqueue(void *p, size_t len);
+    bool dequeue(void **p, size_t *len);
+  };
+
+}  // namespace usrp2
+
+#endif /* INCLUDED_RING_H */