emerge -u world.... is reboot needed?

[TFo]

After upgrading packages on my system, do I need to reboot for the changes to take affect?

I noticed that if I am running say apache, and then upgrade apache while it is running, emerge doesn't restart apache.

Does this mean I need to start and stop services myself for the new verision to be used?

What about other programs/packages that are upgraded while they are running?

-Todd

[Vanquirius]

I may be wrong, but I believe that you have to restart every updated program for the upgrade to take effect, as opposed to the whole system (except for the kernel). There shouldn't be major issues w/upgrading programs while they're running, although it might be a good idea to shut them off before updating them, just in case. Not 100% sure about my statements though.
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Hello.

[rac]

You don't need to reboot unless you are changing either the kernel or the init program, which is part of baselayout.

You may need to manually stop and restart services for upgrades to take effect, as you have noted.

The worst thing I can think of that could happen as a result of upgrading packages while they are running is that shared libraries may change out from under running programs, which could cause the running programs to crash. Portage's dependency mechanism should largely shield you from this, and it would be quite a rare occurrence in any case.
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For every higher wall, there is a taller ladder

[TFo]

Hmmm, that is not quite the assurance I was looking for. Shouldn't emerge handle this for me?

I was thinking of making a script to update my system and mail me a log but I'm worried if I do an update and a service doesn't get restarted then it's not really upgraded.

-Todd

[rac]