SilcBool silc_thread_wait(SilcThread thread, void **exit_value);

    Waits until the thread indicated by `thread' finishes. This blocks
    the execution of the current thread. The thread is finished if it
    calls silc_thread_exit or is destroyed naturally. When the thread
    exits its exit value is saved to `exit_value' and TRUE is returned.
    If the `thread' is not waitable this will return immediately with
    FALSE value.