Log library for C++

Tracker: Feature Requests

5 Support real-time systems - ID: 2857715

Last Update: Comment added ( sroderick )

Details:

We are looking for a log4j-style, C++ logging package to use in soft- and
hard-realtime robotic systems. I was wondering if anyone has previously
considered using log4cpp in realtime systems?

Obviously, appenders that write to disc, etc, would be in non-real-time
parts of the system, but the ability to log from real-time tasks would be
extremely useful. The real killer here is dynamic memory allocation, which
log4cpp uses liberally. Without a O(c) allocator (few operating systems
provide this), it is unuseable in real-time. Reviewing the code, it would
require significant modifications to support real-time, however, this
appears to be much more doable than with log4cxx, etc, due to a decent
class design (and far less dependancies than APR!).

I was just wondering if it had ever been considered?

Cheers
Stephen

Submitted:

Stephen Roderick ( sroderick ) - 2009-09-12 20:08

Priority:

Status:

Open

Resolution:

None

Assigned:

Nobody/Anonymous

Category:

None

Group:

None

Visibility:

Public

Comments ( 2 )

Date: 2009-10-09 01:10 Sender: sroderick Thanks for the possible developer rights. I might take you up on that. The overall picture is that I'm looking at using log4cpp as the basis for a real-time logging system for the Orocos project: http://www.orocos.org/. If you are interested, message list traffic is at http://www.orocos.org/forum/rtt/rtt-dev/logging-replacement while a wiki page with more details is at http://www.orocos.org/wiki/rtt/rtt-20/real-time-logging We're still looking at the overall changes that are required on both the log4cpp and Orocos end of things, but so far the changes for log4cpp look like - being able to build log4cpp with std::string, or with real-time support - using a project-wide string type, which we can override to use a real-time allocatable string instead of std::string when building log4cpp with real-time support (this may only need to be in LoggingEvent, I'm not sure yet) - modifying the HierarchyMaintainer implementation to allow creation of objects derived from log4cpp::Category. Maybe just a factory here, not sure yet. Our derived Category class needs additional objects and information. I would definitely be looking for some suggestions from you, of how you would like these changes to be made. The second one, in particular, is pretty intrusive.
Date: 2009-09-25 18:20 Sender: waffel I don't know about any discussion related to realtime systems. But if you interested in changing log4cpp to have such real-time support you can simple join our development team. I can give you developer rights and support related to the toolchain and maintainance. Of corse you may also put your question in our developer and user maillinglist.

Date: 2009-10-09 01:10
Sender: sroderick

Thanks for the possible developer rights. I might take you up on that.

The overall picture is that I'm looking at using log4cpp as the basis for
a real-time logging system for the Orocos project: http://www.orocos.org/.
If you are interested, message list traffic is at
http://www.orocos.org/forum/rtt/rtt-dev/logging-replacement while a wiki
page with more details is at
http://www.orocos.org/wiki/rtt/rtt-20/real-time-logging

We're still looking at the overall changes that are required on both the
log4cpp and Orocos end of things, but so far the changes for log4cpp look
like
- being able to build log4cpp with std::string, or with real-time support
- using a project-wide string type, which we can override to use a
real-time allocatable string instead of std::string when building log4cpp
with real-time support (this may only need to be in LoggingEvent, I'm not
sure yet)
- modifying the HierarchyMaintainer implementation to allow creation of
objects derived from log4cpp::Category. Maybe just a factory here, not sure
yet. Our derived Category class needs additional objects and information.

I would definitely be looking for some suggestions from you, of how you
would like these changes to be made. The second one, in particular, is
pretty intrusive.

Date: 2009-09-25 18:20
Sender: waffel

I don't know about any discussion related to realtime systems. But if you
interested in changing log4cpp to have such real-time support you can
simple join our development team. I can give you developer rights and
support related to the toolchain and maintainance.

Of corse you may also put your question in our developer and user
maillinglist.

Log library for C++

Tracker: Feature Requests

Comments ( 2 )

Log in to comment.

Attached File

No Files Currently Attached

Change

No changes have been made to this artifact.

About SourceForge

Find Software

Develop Software

Community

Help