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POSIX Threads, PTHREAD routines, pthread_setconcurrency, 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.
    [EAGAIN]    The value specified by new_level would cause a system
                resource to be exceeded.
    [EINVAL]    The value specified by new_level is negative.
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