/sys$common/syshlp/HELPLIB.HLB  —  CRTL  fputc_unlocked, Description
    See the putc_unlocked macro.

    Compiling with the __UNIX_PUTC macro defined enables an
    optimization that uses a faster, inlined version of this
    function.

    See also flockfile, ftrylockfile, and funlockfile.
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