Add SWAP support

src/pipe.hpp

@@ -26,6 +26,7 @@
 #include "i_endpoint.hpp"
 #include "yarray_item.hpp"
 #include "ypipe.hpp"
+#include "msg_store.hpp"
 #include "config.hpp"
 #include "object.hpp"
 
@@ -36,8 +37,7 @@ namespace zmq
     {
     public:
 
-        reader_t (class object_t *parent_,
-            uint64_t hwm_, uint64_t lwm_);
+        reader_t (class object_t *parent_, uint64_t lwm_);
         ~reader_t ();
 
         void set_pipe (class pipe_t *pipe_);
@@ -64,8 +64,7 @@ namespace zmq
         //  Pipe writer associated with the other side of the pipe.
         class writer_t *peer;
 
-        //  High and low watermarks for in-memory storage (in bytes).
-        uint64_t hwm;
+        //  Low watermark for in-memory storage (in bytes).
         uint64_t lwm;
 
         //  Number of messages read so far.
@@ -82,8 +81,7 @@ namespace zmq
     {
     public:
 
-        writer_t (class object_t *parent_,
-            uint64_t hwm_, uint64_t lwm_);
+        writer_t (class object_t *parent_, uint64_t hwm_, int64_t swap_size_);
         ~writer_t ();
 
         void set_pipe (class pipe_t *pipe_);
@@ -117,15 +115,18 @@ namespace zmq
         //  Tests whether the pipe is already full.
         bool pipe_full ();
 
+        //  Write special message to the pipe so that the reader
+        //  can find out we are finished.
+        void write_delimiter ();
+
         //  The underlying pipe.
         class pipe_t *pipe;
 
         //  Pipe reader associated with the other side of the pipe.
         class reader_t *peer;
 
-        //  High and low watermarks for in-memory storage (in bytes).
+        //  High watermark for in-memory storage (in bytes).
         uint64_t hwm;
-        uint64_t lwm;
 
         //  Last confirmed number of messages read from the pipe.
         //  The actual number can be higher.
@@ -134,9 +135,19 @@ namespace zmq
         //  Number of messages we have written so far.
         uint64_t msgs_written;
 
+        //  Pointer to backing store. If NULL, messages are always
+        //  kept in main memory.
+        msg_store_t *msg_store;
+
+        bool extra_msg_flag;
+
+        zmq_msg_t extra_msg;
+
         //  True iff the last attempt to write a message has failed.
         bool stalled;
 
+        bool pending_close;
+
         //  Endpoint (either session or socket) the pipe is attached to.
         i_endpoint *endpoint;
 
@@ -150,7 +161,7 @@ namespace zmq
     public:
 
         pipe_t (object_t *reader_parent_, object_t *writer_parent_,
-            uint64_t hwm_);
+            uint64_t hwm_, int64_t swap_size_);
         ~pipe_t ();
 
         reader_t reader;