From b89dabb5f10155bc54ae983a156d5cc5a810c9ed Mon Sep 17 00:00:00 2001
From: Augustin Degomme <degomme@idpann.imag.fr>
Date: Wed, 8 Aug 2012 11:18:40 +0200
Subject: [PATCH] Add a MSG_mailbox_set_async function to allow to set a
 mailbox to eagerly receive messages (the message is sent without waiting for
 the receive)

---
 include/msg/msg.h     |  3 +++
 src/msg/msg_mailbox.c |  8 ++++++++
 src/msg/msg_mailbox.h | 13 +++++++++++++
 3 files changed, 24 insertions(+)

diff --git a/include/msg/msg.h b/include/msg/msg.h
index e3b5ac1ce8..24bf774bb5 100644
--- a/include/msg/msg.h
+++ b/include/msg/msg.h
@@ -263,6 +263,9 @@ XBT_PUBLIC(msg_error_t)
     MSG_mailbox_put_with_timeout(msg_mailbox_t mailbox, msg_task_t task,
                              double timeout);
 
+void MSG_mailbox_set_async(const char *alias);
+
+
 /************************** Action handling **********************************/
 msg_error_t MSG_action_trace_run(char *path);
 
diff --git a/src/msg/msg_mailbox.c b/src/msg/msg_mailbox.c
index 8d1e7c9ed1..d8509ed30b 100644
--- a/src/msg/msg_mailbox.c
+++ b/src/msg/msg_mailbox.c
@@ -56,6 +56,14 @@ msg_mailbox_t MSG_mailbox_get_by_alias(const char *alias)
   return mailbox;
 }
 
+void MSG_mailbox_set_async(const char *alias){
+  msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
+
+  mailbox->permanent_receiver=SIMIX_process_self();
+  XBT_VERB("%s mailbox set to receive eagerly for process %p\n",alias, SIMIX_process_self());
+
+}
+
 msg_error_t
 MSG_mailbox_get_task_ext(msg_mailbox_t mailbox, msg_task_t * task,
                          msg_host_t host, double timeout)
diff --git a/src/msg/msg_mailbox.h b/src/msg/msg_mailbox.h
index ded6199e64..9f3f37915c 100644
--- a/src/msg/msg_mailbox.h
+++ b/src/msg/msg_mailbox.h
@@ -66,6 +66,19 @@ XBT_PUBLIC(msg_mailbox_t)
  */
 XBT_PUBLIC(int) MSG_mailbox_is_empty(msg_mailbox_t mailbox);
 
+/* \brief MSG_mailbox_set_async - set a mailbox as eager
+ *
+ * The function MSG_mailbox_set_async sets the mailbox to a permanent receiver mode
+ * Messages sent to this mailbox will then be sent just after the send is issued,
+ * without waiting for the corresponding receive.
+ *
+ * This call should be done before issuing any receive, and on the receiver's side only
+ *
+ * \param alias    The alias of the mailbox to modify.
+ *
+ */
+void MSG_mailbox_set_async(const char *alias);
+
 /*! \brief MSG_mailbox_get_head - get the task at the head of a mailbox.
  *
  * The MSG_mailbox_get_head returns the task at the head of the mailbox.
-- 
2.20.1