I want to write a big Apache Module in C with many lines of code and many dependencies to external libraries and compile it with APXS. Lets assume that the code segment of this C program consumes a huge chunk of memory: 100 MB.
What happens concerning the memory, when the module is called 5 times concurrently? Is the code segment of the C program shared between each invocation, similar to multi-threading, or is the code segment copied in memory?
If the answer is copy: Since I'm working on a Linux machine, does the "Copy-on-Write" mechanism reliably prevent the actual copy in memory?
At the end: Does the code segment of the 5 concurrent calls consume 100 MB or 500 MB?