Daniel F. Savarese wrote:

In message <20060911172413.74527.qmail@web57207.mail.re3.yahoo.com>, smith smit hson writes:

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This is regarding the boost serialization library. Is it possible to append to a pre-existing archive file?

I don't think anyone's answered this yet. The answer is yes.

Hmmm - that would surprise me.

While on the topic of boost serialization, I'll add an unrelated note that you cannot safely serialize objects from different threads when using separate archive instances in each thread. Boost serialization uses local static variables in places like boost:archive::detail::oserializer::instantiate(), so even though you're using separate archive instances, there's only a single serializer for a given archive type/object type pair.

True - but this should be no problem since the the static object never changes. That is all the functions on this static object ar "const" so they should be re-entrant. Therefore, if you concurrently

serialize the same type of object with separate instances of the same archive type, you can segfault.

I don't see this.

The solution of course is to use critical sections or delegate all serialization to a single thread. But you wouldn't expect to have to do so when using separate instances because the global behavior is not obvious to the API user.

I don't think this should be necessary. If it is, then it is contraty to my intentation. Robert Ramey