From 57b69c40c630d8240cff989b5c35e449486aab8e Mon Sep 17 00:00:00 2001
From: Arnaud Giersch <arnaud.giersch@iut-bm.univ-fcomte.fr>
Date: Fri, 7 Jan 2011 09:20:22 +0100
Subject: [PATCH] Revise process::receive and get rid of WAIT_FOR_CLOSE.

Next step is to revise process::run...
---
 process.cpp | 27 +++++++++------------------
 process.h   |  9 +++++----
 2 files changed, 14 insertions(+), 22 deletions(-)

diff --git a/process.cpp b/process.cpp
index 5f393bd..338f20d 100644
--- a/process.cpp
+++ b/process.cpp
@@ -40,8 +40,6 @@ process::process(int argc, char* argv[])
 
     ctrl_close_pending = data_close_pending = neigh.size();
     close_received = false;
-    may_receive =  (neigh.size() > 0); // the same as (ctrl_close_pending ||
-                                       //              data_close_pending)
     finalizing = false;
 
     e_xbt_log_priority_t logp = xbt_log_priority_verbose;
@@ -104,17 +102,17 @@ int process::run()
 
         // block on receiving unless there is something to compute or
         // to send
-        bool recv_wait = (load == 0 &&
-                          ((opt::bookkeeping ? expected_load : load)
-                           == prev_load_broadcast));
-        receive(recv_wait? WAIT: NO_WAIT);
+        bool wait = (load == 0 &&
+                     ((opt::bookkeeping ? expected_load : load)
+                      == prev_load_broadcast));
+        receive(wait);
 
         // one of our neighbor is finalizing
         if (opt::exit_on_close && close_received)
             break;
 
         // have no load and cannot receive anything
-        if (load == 0.0 && !may_receive)
+        if (load == 0.0 && !may_receive())
             break;
 
         // fixme: this check should be implemented with a distributed
@@ -231,16 +229,12 @@ void process::send()
     }
 }
 
-void process::receive(recv_wait_mode wait)
+void process::receive(bool wait)
 {
     message* msg;
     m_host_t from;
 
-    DEBUG1("go for receive(%s)",
-           "NO_WAIT\0WAIT\0\0\0\0WAIT_FOR_CLOSE" + 8 * wait);
-
-    bool do_wait = (wait != NO_WAIT);
-    while (may_receive && comm.recv(msg, from, do_wait)) {
+    if (may_receive() && comm.recv(msg, from, wait)) {
         switch (msg->get_type()) {
         case message::INFO: {
             neighbor* n = rev_neigh[from];
@@ -259,18 +253,14 @@ void process::receive(recv_wait_mode wait)
         }
         case message::CTRL_CLOSE:
             ctrl_close_pending--;
-            DEBUG1("ctrl_close_pending = %d", ctrl_close_pending);
             close_received = true;
             break;
         case message::DATA_CLOSE:
             data_close_pending--;
-            DEBUG1("data_close_pending = %d", data_close_pending);
             close_received = true;
             break;
         }
         delete msg;
-        may_receive = (ctrl_close_pending || data_close_pending);
-        do_wait = (wait == WAIT_FOR_CLOSE);
     }
 }
 
@@ -295,7 +285,8 @@ void process::finalize()
 
     DEBUG2("wait for CLOSE from %lu neighbor%s",
            (unsigned long )neigh.size(), ESSE(neigh.size()));
-    receive(WAIT_FOR_CLOSE);
+    while (may_receive())
+        receive(true);
 
     comm.flush(true);
 }
diff --git a/process.h b/process.h
index 654237b..b15f982 100644
--- a/process.h
+++ b/process.h
@@ -66,7 +66,6 @@ private:
     int data_close_pending;     // number of "close" messages to wait
                                 // on data channel
     bool close_received;        // true if we received a "close" message
-    bool may_receive;           // true if there remains neighbors to listen for
     bool finalizing;            // true when finalize() is running
 
     unsigned lb_iter;           // counter of load-balancing iterations
@@ -91,9 +90,11 @@ private:
     void send1_bookkeeping(neighbor& nb);
     void send();
 
-    // Receive procedure: wait (or not) for a message to come.
-    enum recv_wait_mode { NO_WAIT = 0, WAIT, WAIT_FOR_CLOSE };
-    void receive(recv_wait_mode wait);
+    // Returns true if there remains neighbors to listen for
+    bool may_receive() { return ctrl_close_pending || data_close_pending; }
+
+    // Receive procedure: wait (or not) for a message to come
+    void receive(bool wait);
 
     // Finalize sends a "close" message to each neighbor and wait for
     // all of them to answer.
-- 
2.39.5