:   '''[thread]::eval''' ?'''-lock''' ''mutex''? ''arg'' ?''arg ...''?

This command [concat]enates the ''arg''s and evaluates the resulting script under the protection of a mutex. If '''-lock''' is given, the ''mutex'' named will be used, otherwise an internal unnamed global mutex will be used.

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**See also**
   * [thread::mutex]
   * [thread::rwmutex]

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