From 61c63b5df9b55aec7c072edb5b392569b215cb83 Mon Sep 17 00:00:00 2001
From: Arnaud Giersch <arnaud.giersch@iut-bm.univ-fcomte.fr>
Date: Wed, 26 Jan 2011 13:38:09 +0100
Subject: [PATCH 1/1] Synchronize the processes before exiting.

The goal is to circumvent a limitation in SimGrid (at least in
version 3.5): a process must be alive when another one destroys
a communication they had together.
---
 main.cpp | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/main.cpp b/main.cpp
index 67af3fe..fc42d75 100644
--- a/main.cpp
+++ b/main.cpp
@@ -34,6 +34,10 @@ namespace {
         EXIT_FAILURE_CLEAN = 0x08,  // error at cleanup
     };
 
+    xbt_mutex_t proc_mutex;
+    xbt_cond_t proc_cond;
+    unsigned proc_counter;
+
     struct statistics comps;
     struct statistics loads;
 
@@ -45,9 +49,28 @@ static int simulation_main(int argc, char* argv[])
     process* proc;
     try {
         proc = opt::loba_algorithms.new_instance(opt::loba_algo, argc, argv);
+
+        xbt_mutex_acquire(proc_mutex);
+        ++proc_counter;
+        xbt_mutex_release(proc_mutex);
+
         result = proc->run();
+
+        xbt_mutex_acquire(proc_mutex);
         comps.push(proc->get_comp());
         loads.push(proc->get_real_load());
+
+        // Synchronization barrier...
+        // The goal is to circumvent a limitation in SimGrid (at least
+        // in version 3.5): a process must be alive when another one
+        // destroys a communication they had together.
+
+        --proc_counter;
+        xbt_cond_broadcast(proc_cond);
+        while (proc_counter > 0)
+            xbt_cond_wait(proc_cond, proc_mutex);
+        xbt_mutex_release(proc_mutex);
+
         delete proc;
     }
     catch (std::invalid_argument& e) {
@@ -167,11 +190,19 @@ int main(int argc, char* argv[])
 
         exit_status = EXIT_FAILURE_SIMU; // =====
 
+        proc_mutex = xbt_mutex_init();
+        proc_cond = xbt_cond_init();
+        proc_counter = 0;
+
         // Launch the MSG simulation.
         INFO1("Starting simulation at %f...", MSG_get_clock());
         res = MSG_main();
         simulated_time = MSG_get_clock();
         INFO1("Simulation ended at %f.", simulated_time);
+
+        xbt_cond_destroy(proc_cond);
+        xbt_mutex_destroy(proc_mutex);
+
         if (res != MSG_OK)
             THROW1(0, 0, "MSG_main() failed with status %#x", res);
 
-- 
2.39.5