Create and work with ordinary [mutex]es.

    :   '''[thread]::mutex create'''  ?'''-recursive'''? 
    :   '''[thread]::mutex destroy''' ''mutex''
    :   '''[thread]::mutex lock''' ''mutex''
    :   '''[thread]::mutex unlock''' ''mutex''

----
**See also**
   * [thread::rwmutex]
   * [thread::cond]
<<categories>>Command