From c3aba869402fd6e57bd6c70dde801e6995037d99 Mon Sep 17 00:00:00 2001
From: Martin Quinson <martin.quinson@ens-rennes.fr>
Date: Sat, 19 Mar 2022 20:12:48 +0100
Subject: [PATCH] Give users a way to debug their barriers

---
 include/simgrid/s4u/Barrier.hpp     | 2 ++
 src/kernel/activity/BarrierImpl.hpp | 5 +++++
 src/s4u/s4u_Barrier.cpp             | 5 +++++
 3 files changed, 12 insertions(+)

diff --git a/include/simgrid/s4u/Barrier.hpp b/include/simgrid/s4u/Barrier.hpp
index 1e5e589f75..547f5d82d4 100644
--- a/include/simgrid/s4u/Barrier.hpp
+++ b/include/simgrid/s4u/Barrier.hpp
@@ -34,6 +34,8 @@ public:
   static BarrierPtr create(unsigned int expected_actors);
   /** Blocks into the barrier. Every waiting actors will be unlocked once the expected amount of actors reaches the barrier */
   int wait();
+  /** Returns some debug information about the barrier */
+  std::string to_string();
 
 #ifndef DOXYGEN
   /* refcounting */
diff --git a/src/kernel/activity/BarrierImpl.hpp b/src/kernel/activity/BarrierImpl.hpp
index e34ba73ac6..b214e5f161 100644
--- a/src/kernel/activity/BarrierImpl.hpp
+++ b/src/kernel/activity/BarrierImpl.hpp
@@ -74,6 +74,11 @@ public:
   }
 
   s4u::Barrier& get_iface() { return piface_; }
+
+  std::string to_string()
+  {
+    return xbt::string_printf("Barrier %d: %zu of %u", id_, ongoing_acquisitions_.size(), expected_actors_);
+  }
 };
 } // namespace activity
 } // namespace kernel
diff --git a/src/s4u/s4u_Barrier.cpp b/src/s4u/s4u_Barrier.cpp
index 8aa46d2392..297109e115 100644
--- a/src/s4u/s4u_Barrier.cpp
+++ b/src/s4u/s4u_Barrier.cpp
@@ -53,6 +53,11 @@ int Barrier::wait()
   }
 }
 
+std::string Barrier::to_string()
+{
+  return pimpl_->to_string();
+}
+
 void intrusive_ptr_add_ref(Barrier* barrier)
 {
   intrusive_ptr_add_ref(barrier->pimpl_);
-- 
2.20.1