Bug 1044

Summary:	Seconds (1e-9) creates Time that is not IsPositive ()
Product:	ns-3	Reporter:	Artem Krasilov <krasilov>
Component:	core	Assignee:	Mathieu Lacage <mathieu.lacage>
Status:	RESOLVED FIXED
Severity:	normal	CC:	mathieu.lacage, ns-bugs
Priority:	P5
Version:	ns-3-dev
Hardware:	All
OS:	All
Attachments:	simpe program showing the problem

Description Artem Krasilov 2011-01-17 04:48:14 UTC

I'm trying to schedule a method in a small amount of time (~1e-9 sec).
To achieve this I have to instantiate Time object which turns out to be non-positive (IsPositive() returns false).
Non-positive Time leads to assert failure in DefaultSimulatorImpl::Schedule():

assert failed. cond="tAbsolute >= TimeStep (m_currentTs)", file=../src/simulator/default-simulator-impl.cc, line=193

This is not very surprising by itself but this also leads to random (depending on RngRun) crashes if the scheduling amount is taken from RandomVariable.
This can cause corrupted simulation results.

Example to reproduce this bug is in the attachment.
It's worth to mention, that the same example works fine in mathieu/ns-3-time repository.

Comment 1 Artem Krasilov 2011-01-17 04:50:20 UTC

Created attachment 1025 [details]
simpe program showing the problem

Comment 2 Mathieu Lacage 2011-04-17 08:34:28 UTC

merged ns-3-time