Create and work with read-write [mutex]es.

    :   '''[thread]::rwmutex create'''
    :   '''[thread]::rwmutex destroy''' ''mutex''
    :   '''[thread]::rwmutex rlock''' ''mutex''
    :   '''[thread]::rwmutex wlock''' ''mutex''
    :   '''[thread]::rwmutex unlock''' ''mutex''
                  
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**See also**
   * [thread::mutex]
   * [thread::cond]
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