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POSIX Threads, PTHREAD routines, sched_yield, Return Values
 *Conan The Librarian 

    If an error condition occurs, this routine returns an integer
    value indicating the type of error. Possible return values are as
    follows:

    Return      Description

    0           Successful completion.
    [ENOSYS]    The routine sched_yield()  is not supported by this
                implementation.
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