Is c lib a static in c++ program?

I have a c lib, algo.lib, which I need to call in my c++ program. I realise that the variables in algo.lib is static, which creates problem for my c++ program, when I call algo.lib multiple times, or use threads to call algo开发者_如何学JAVA.lib concurrently.

For example, in algo.lib, there is a int a which is initiall set to 0. When I call algo.lib the first time, a will be set to 1000. But when I call algo.lib another time, I want the variables in algo.lib to be in the initial state, that is, a = 0 and not a = 1000.

Is it possible to make algo.lib to become object-oriented, so that when I call its function, it is created as an object and is set to its initial state? And after finish running algo.lib, this object is destroyed?

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Yes, it is possible. If you rewrite it. If you only have the binary - then you cannot change this behavior. You can solve it by creating a separate executable that will do what you want with it and then exit, and pass the results back to the main program through some IPC. Basically - wrap it with your own implementation that will effectively initialize the library for each separate call.