----------------------------------
|                                |
|  available operations          |
|  defined inside the monitor    |
|                                |
|  ---  ---  ---     ---         |
|  | |  | |  | | ... | |         | <==== queue of calls to an operation
|  ---  ---  ---     ---         |       in the monitor
|                                |
|                                |
|  global data and local data    |
|  all internal to the monitor   |
|  i.e. inaccessible outside     |
|  the monitor                   |
|                                |
|  procedures implementing the   |
|  operations i.e. the details   |
|  of the data structures        |
|  making up the object          |
|                                | <=== queue of processes blocked on cond_1
|  condition variables           | <=== queue of processes blocked on cond_2
|    cond_1, cond_2, ...         | <=== ...
|                                |
----------------------------------