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SPDX-License-Identifier: CC-BY-SA-4.0
copyrights:
- Copyright (C) 2021 embedded brains GmbH (http://www.embedded-brains.de)
enabled-by: true
glossary-type: term
links:
- role: glossary-member
uid: /glossary-requirements
term: interval
text: |
The current interval starts with the last return from a successful call to
${../if/period:/name} which does not use ${../if/period-status-define:/name}
as value for parameter ${../if/period:/params[1]/name}. The current
interval ends with the return from the next successful call to
${../if/period:/name} which does not use ${../if/period-status-define:/name}
as value for parameter ${../if/period:/params[1]/name}. See also
start/end ${../glossary/deadline:/term}.
The parameter ${../if/period:/params[1]/name} of that call specifies the
interval length of the period.
**Warning**: All calls to ${../if/period:/name} for the same period must
provide the same value for parameter ${../if/period:/params[1]/name}. That
is, the intervals of a period must have a strictly regular length. If that
is not the case and the period enters ${../glossary/expired:/term}
${../glossary/state:/term}, future period ${../glossary/deadline:/term} are
set arbitrarily because the use of ${../glossary/postponedjob:/plural}
implicitly assumes a fixed time length for future
${../glossary/job:/plural}.
Note, an interval denotes a time while ${../glossary/job:/term} denotes code.
Note also, if a first call to ${../if/period:/name} which does not use
${../if/period-status-define:/name} returned and a second
${../if/period:/name} which does not use ${../if/period-status-define:/name}
is invoked but did not yet return, the current interval is still the one of
the first call.
type: glossary
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