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In the single level store: The individual pages within a segment are contiguous addresses. This includes user spaces. It is the segment identifiers themselves are discontiguous. The system ensures that one cannot address outside of the boundaries of one's current segment. Thus, if one loads an MI space pointer, it cannot be made to address some unrelated segment. It can reference any valid byte in its own segment, one way or another. Think of the segement identifier of the space pointer as an unmodifiable token and the offset as a more-or-less standard virtual address. The thing that makes single level store what it is is: 1) the unmodifiable token is more-or-less visible to the problem state program in the MI pointer, 2) an MI pointer can be passed between jobs and used identically in both. In general and in practice, one cannot allocate multiple segments (e.g. multiple user spaces) and expect the segment identifiers that result to be numerically adjacent. Even if they were (and, they won't be), the system will behave in a manner to make any adjacency of segment number irrelevant. The "token" aspect of the segment identifier is virulently enforced, as you would expect. Larry W. Loen - Senior Java and iSeries Performance Analyst Dept HP4, Rochester MN +--- | This is the MI Programmers Mailing List! | To submit a new message, send your mail to MI400@midrange.com. | To subscribe to this list send email to MI400-SUB@midrange.com. | To unsubscribe from this list send email to MI400-UNSUB@midrange.com. | Questions should be directed to the list owner/operator: dr2@cssas400.com +---
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