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floatingwoods

Turn a non reentrant C library into a library supporting several instances of itself

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Hello,

 

I am wondering how to handle following problem:

 

I have a C-language library that performs calculations on a mesh, but cannot be called several times (i.e. is not reentrant). I have the source code, and I am wondering how to "wrap" that library so as to be able to instanciate it several times.

 

I see two options:

 

1. Write a wrapper in C++. The problem with this approach is that I would have to heavily modify the C library. Knowing that the C library itself will evolve independently, I would have to constantly adapt my wrapper.

 

2. Not sure if this is possible, but somehow load the library into memory several time. E.g., if that library is compiled as a shared library, my application could dynamically load and use its exported functions. Is there a way or mode that allows to load a same shared library into several different memory locations?

 

Would there be another option?

 

Thanks for any insight!

 

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Not being reentrant means you can't call it recursively or from multiple threads simultaneously. Do you need to do that? You can get around having to use recursion by batching up a list of meshes to operate on (e.g. do a pass and enumerate all child meshes into a list, then do all the operations on the list one after the other). Rewriting it in C++ wont magically make it safe for reentrancy.
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Thanks edd and Paradigm Shifter,

 

The C code has to run on Windows, Mac OSX and Linux. I guess that makes it a bit more complicated for the solution where the library is loaded several times into memory.

I will go with your solution edd, even if a bit troublesome (since I have to touch the original code quite deeply).

 

Thanks at lot!!

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