X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/a9af1b0795c4a75f8919d7a87491fe7ab041b272..778f65057da68465382593cd036b6ee59ada54e9:/src/gras/Transport/transport_private.h

diff --git a/src/gras/Transport/transport_private.h b/src/gras/Transport/transport_private.h
index 9b384ecc29..becb2627aa 100644
--- a/src/gras/Transport/transport_private.h
+++ b/src/gras/Transport/transport_private.h
@@ -26,6 +26,20 @@
 #include "gras/Virtu/virtu_interface.h" /* libdata management */
 
 extern int gras_trp_libdata_id; /* our libdata identifier */
+
+/* The function that select returned the last time we asked. We need this because the TCP read 
+   are greedy and try to get as much data in their buffer as possible (to avoid subsequent syscalls).
+   (measurement sockets are not buffered and thus not concerned).
+  
+   So, we can get more than one message in one shoot. And when this happens, we have to handle 
+   the same socket again afterward without select()ing at all. 
+ 
+   Then, this data is not a static of the TCP driver because we want to zero it when
+   it gets closed by the user. If not, we use an already freed pointer, which is bad.
+ 
+   It gets tricky since gras_socket_close is part of the common API, not only the RL one. */
+extern gras_socket_t _gras_lastly_selected_socket;
+
 /**
  * s_gras_socket:
  * 
@@ -44,7 +58,8 @@ typedef struct s_gras_socket  {
   int valid :1; /* false if a select returned that the peer quitted, forcing us to "close" the socket */
   int moredata :1; /* TCP socket use a buffer and read operation get as much data as possible. 
 		      It is possible that several messages are received in one shoot, and select won't catch them afterward again.
-		      This boolean indicates that this is the case, so that we don't call select in that case. */
+		      This boolean indicates that this is the case, so that we don't call select in that case. 
+		      Note that measurement sockets are not concerned since they use the TCP interface directly, with no buffer. */
 
   unsigned long int buf_size; /* what to say to the OS. field here to remember it when accepting */