From: Kevin Piotrkowski <kevin.piotrkowski@avature.net>
Date: Sat, 11 Aug 2018 22:16:21 +0000 (-0300)
Subject: Add method to check if a mailbox has a message ready to be consumed without having... 
X-Git-Tag: v3_21~259^2^2~1
X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/commitdiff_plain/1ed0e64dc405fbb627ff8a7d7b70ac4ff81cd489?hp=0dfec40ad0e228992ff3095af88609068979496e

Add method to check if a mailbox has a message ready to be consumed without having to wait
---

diff --git a/include/simgrid/s4u/Mailbox.hpp b/include/simgrid/s4u/Mailbox.hpp
index 8b4267a86f..6dd039475b 100644
--- a/include/simgrid/s4u/Mailbox.hpp
+++ b/include/simgrid/s4u/Mailbox.hpp
@@ -131,6 +131,9 @@ public:
   /** Check if there is a communication going on in a mailbox. */
   bool listen();
 
+  /** Check if there is a communication ready to be consumed from a mailbox. */
+  bool ready();
+
   /** Gets the first element in the queue (without dequeuing it), or nullptr if none is there */
   smx_activity_t front();
 
diff --git a/src/s4u/s4u_Mailbox.cpp b/src/s4u/s4u_Mailbox.cpp
index e33292eb30..b2b60de515 100644
--- a/src/s4u/s4u_Mailbox.cpp
+++ b/src/s4u/s4u_Mailbox.cpp
@@ -43,6 +43,18 @@ bool Mailbox::listen()
   return not this->empty() || (pimpl_->permanent_receiver_ && not pimpl_->done_comm_queue_.empty());
 }
 
+bool Mailbox::ready()
+{
+  bool comm_ready = false;
+  if (not pimpl_->comm_queue_.empty()) {
+    comm_ready = pimpl_->comm_queue_.front()->state_ == SIMIX_DONE;
+  }
+  if (!comm_ready && pimpl_->permanent_receiver_ && not pimpl_->done_comm_queue_.empty()) {
+    comm_ready = pimpl_->done_comm_queue_.front()->state_ == SIMIX_DONE;
+  }
+  return comm_ready;
+}
+
 smx_activity_t Mailbox::front()
 {
   return pimpl_->comm_queue_.empty() ? nullptr : pimpl_->comm_queue_.front();