From: mquinson <mquinson@48e7efb5-ca39-0410-a469-dd3cf9ba447f>
Date: Fri, 16 May 2008 16:08:54 +0000 (+0000)
Subject: Sometimes, the time to wait is soo small that the increment does not change the globa... 
X-Git-Tag: v3.3~500
X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/commitdiff_plain/625fca10d205608488a33657f398f8355cc8575d?ds=sidebyside

Sometimes, the time to wait is soo small that the increment does not change the global clock (for example, 100000 + 10E-15=100000). Add an epsilon to the wait to avoid the issue. I'm still not completely sure that the fix is 100% effective (because 10E300 + 1 = 10E300), but I don't have any better idea

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/simgrid/simgrid/trunk@5436 48e7efb5-ca39-0410-a469-dd3cf9ba447f
---

diff --git a/src/gras/Msg/gras_msg_exchange.c b/src/gras/Msg/gras_msg_exchange.c
index bb894e03b3..0cafee709c 100644
--- a/src/gras/Msg/gras_msg_exchange.c
+++ b/src/gras/Msg/gras_msg_exchange.c
@@ -270,6 +270,7 @@ gras_msg_handleall(double period) {
 
   do {
     now=gras_os_time();
+          
     TRY{
       if (period - now + begin > 0)
 	gras_msg_handle(period - now + begin);
@@ -278,7 +279,8 @@ gras_msg_handleall(double period) {
 	RETHROW0("Error while waiting for messages: %s");
       xbt_ex_free(e);
     }
-  } while (now - begin < period);
+     /* Epsilon to avoid numerical stability issues were the waited interval is so small that the global clock cannot notice the increment */
+  } while (now - begin < period - 0.000001);
 }
 
 /** @brief Handle an incomming message or timer (or wait up to \a timeOut seconds)