What is the lock function?

What is the lock function I see in CRT source files?

What do you mean by "CRT source files"? When I google I get lots of Cathode Ray Tube hits, but I don't think that's what you mean.

C runtime. like crt0.c

Where do you see lock() used? Maybe it locks the screen or something.

I really don't know what it does.

Code:

---

void __cdecl _lockexit (
        void
        )
{
        _mlock(_EXIT_LOCK1);
}

---

In crt0dat.c

It should has something to do with execution mechanism.

It locks memory pages.
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