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  1. MariaDB Server
  2. MDEV-6712

THD specifics for plugins

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      Description

      This patch adds generic infrastructure for plugins to store
      things on a THD object (rather that polluting THD object with
      new member variables)

      The feature is modeled after pthread specifics hence
      the plugin shall at startup create a key, that can later be used
      by multiple thread in parallel wo/ locks (if access is made to different
      THD objects). The creation/destruction of a key is though mutex protected.
      The feature is similar to ha_data, but exists for any type of plugin.

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            Assignee:
            serg Sergei Golubchik
            Reporter:
            jonaso Jonas Oreland
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