× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.



>
>I would not depend on using the timestamp as a unique key.  As you have
>found out, on a sufficiently fast enough machine you can get duplicates.
>The upshot of this is that even if it works today, when the next generation
>of CPUs come out it might fail.
>

Just wanted to point out that there is a unique timestamp available
on the system.  If you access the system Time of Day (TOD) clock then
the full 8-byte value will be unique.  This uniqueness is ensured by
the system so long as you do not set the system time backwards (which
means there currently is a small exposure for those systems that
observe Daylight Saving Time/Standard Time).  To access the TOD in RPG
use:

DMatTOD           PR                  EXTPROC('_MATTOD')
D                                8
DReceiver         s              8
C                   callp     MatTOD(Receiver)

Receiver can then be converted to a more readable format using the
Convert Date and Time (QWCCVTDT) API and format *DTS.  The *DTS format
itself measures time with 8-microsecond granularity, and uses bits beyond
bit 48 (base 0) to provide unique values for when multiple accesses to
the TOD may occur within the same 8-microsecond interval.

Bruce Vining



+---
| This is the RPG/400 Mailing List!
| To submit a new message, send your mail to RPG400-L@midrange.com.
| To subscribe to this list send email to RPG400-L-SUB@midrange.com.
| To unsubscribe from this list send email to RPG400-L-UNSUB@midrange.com.
| Questions should be directed to the list owner/operator: david@midrange.com
+---


As an Amazon Associate we earn from qualifying purchases.

This thread ...


Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.