1 files changed, 108 insertions, 0 deletions
diff --git a/host/lib/transport/zero_copy.cpp b/host/lib/transport/zero_copy.cpp
new file mode 100644
index 000000000..a5a864a04
--- /dev/null
+++ b/host/lib/transport/zero_copy.cpp
@@ -0,0 +1,108 @@
+//
+// Copyright 2010 Ettus Research LLC
+//
+// This program 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 of the License, or
+// (at your option) any later version.
+//
+// This program 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, see <http://www.gnu.org/licenses/>.
+//
+
+#include <uhd/transport/zero_copy.hpp>
+
+using namespace uhd::transport;
+
+/***********************************************************************
+ * Safe managed receive buffer
+ **********************************************************************/
+static void release_nop(void){
+    /* NOP */
+}
+
+class safe_managed_receive_buffer : public managed_recv_buffer{
+public:
+    safe_managed_receive_buffer(
+        const boost::asio::const_buffer &buff,
+        const release_fcn_t &release_fcn
+    ):
+        _buff(buff), _release_fcn(release_fcn)
+    {
+        /* NOP */
+    }
+
+    ~safe_managed_receive_buffer(void){
+        _release_fcn();
+    }
+
+    void release(void){
+        release_fcn_t release_fcn = _release_fcn;
+        _release_fcn = &release_nop;
+        return release_fcn();
+    }
+
+private:
+    const boost::asio::const_buffer &get(void) const{
+        return _buff;
+    }
+
+    const boost::asio::const_buffer _buff;
+    release_fcn_t _release_fcn;
+};
+
+managed_recv_buffer::sptr managed_recv_buffer::make_safe(
+    const boost::asio::const_buffer &buff,
+    const release_fcn_t &release_fcn
+){
+    return sptr(new safe_managed_receive_buffer(buff, release_fcn));
+}
+
+/***********************************************************************
+ * Safe managed send buffer
+ **********************************************************************/
+static void commit_nop(size_t){
+    /* NOP */
+}
+
+class safe_managed_send_buffer : public managed_send_buffer{
+public:
+    safe_managed_send_buffer(
+        const boost::asio::mutable_buffer &buff,
+        const commit_fcn_t &commit_fcn
+    ):
+        _buff(buff), _commit_fcn(commit_fcn)
+    {
+        /* NOP */
+    }
+
+    ~safe_managed_send_buffer(void){
+        _commit_fcn(0);
+    }
+
+    void commit(size_t num_bytes){
+        commit_fcn_t commit_fcn = _commit_fcn;
+        _commit_fcn = &commit_nop;
+        return commit_fcn(num_bytes);
+    }
+
+private:
+    const boost::asio::mutable_buffer &get(void) const{
+        return _buff;
+    }
+
+    const boost::asio::mutable_buffer _buff;
+    commit_fcn_t _commit_fcn;
+};
+
+safe_managed_send_buffer::sptr managed_send_buffer::make_safe(
+    const boost::asio::mutable_buffer &buff,
+    const commit_fcn_t &commit_fcn
+){
+    return sptr(new safe_managed_send_buffer(buff, commit_fcn));
+}