Multiple access to members

A member can be read simultaneously by several users; it can, however, be written to by one user only. When the member has been opened for writing, no other access - including read access - to this member can be performed, but access to other members of the library is possible.

Figure 4: Multiple access to members

As a result of the multiple access options to a library a member may still exist while the directory is being listed, but be no longer in existence when it is subsequently accessed. Another user has deleted it in the meantime. A listing of the library’s directory (statement SHOW-ELEMENT-ATTRIBUTES) will therefore only show the current state of the input library.