If that's what is wanted, then the async_submit() API can detect the
syncronous completion soon, and drop a result inside the result-queue
immediately. It means that an immediately following async_wait() will find
some completions soon. Or:

struct async_submit {
        void *cookie;
        int sysc_nbr;
        int nargs;
        long args[ASYNC_MAX_ARGS];
};
struct async_result {
        void *cookie;
        long result:
};

int async_submit(struct async_submit *a, struct async_result *r, int n);

Where "r" will store the ones that completed syncronously. I mean, there
are really many ways to do this.

That interface (modifying async_submit to pass in the size of the
result array) would work great.
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