2002-09-17 Robert Collins <rbtcollins@hotmail.com>

        This work inspires by Thomas Pfaff's pthread_fork patch (1).
        * fork.cc (fork_child): Remove MTinterface fixup call, it's
        adsorbed by pthread::atforkchild.
        Rename __pthread_atforkchild to pthread::atforkchild to give
        access to private members.
        (fork_parent): Rename __pthread_atforkparent to
        pthread::atforkparent to give it access to private members.
        Ditto for __pthread_atforkprepare.
        * thread.cc: Fix some formatting problems throughout.
        (MTinterface::fixup_before_fork): Implement.
        (MTinterface::fixup_after_fork): Fix pthread_keys.
        (pthread_key::keys): Implement.
        (pthread_key::fixup_before_fork): Ditto.
        (pthread_key::fixup_after_fork): Ditto.
        (pthread_key::pthread_key): Add to pthread_key::keys.
        (pthread_key::~pthread_key): Remove from pthread_key::keys.
        (pthread_key::saveKeyToBuffer): Implement.
        (pthread_key::recreateKeyFromBuffer): Ditto.
        (pthread::atforkprepare): Prepare all MT classes for fork.
        (pthread::atforkchild): And fix them up afterwards.
        * thread.h (pthread_key): Buffer the key value during
        fork in fork_buf.
        List the keys needing to be fixed up in a linked list with
        head pthread_key::keys.
        (pthread): Move atfork cygwin internal calls into the class.
        (MTInterface): Provide a fixup_before_fork for objecst that
        need to save state.
        (__pthread_atforkprepare): Remove.
        (__pthread_atforkparent): Remove.
        (__pthread_atforkchild): Remove.

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