Apache C++ module persistent global objects

Question

I want to keep some global objects in an Apache C++ module persistent across Apache child process invocations. How do I do this?

Answer 1

I can't tell you exactly how to do this, but the following article may help you along the way: http://www.apachetutor.org/dev/pools

Answer 2

You must use some form of storage external to the Apache processes.

Basic choices:

• A database.
• Shared memory (OS dependent).
• Another process and use an IPC mechanism (eg. a socket)
• A file.

Which one is appropriate depends on your requirements, and you might combine them. For example, "a database" is actually implemented as another process that makes things persistent in a file and it deals with concurrency issues in a known way.

In general, a database is probably the first thing to try and only go to other alternatives if you have specific issues that can be solved by taking a different approach.