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Diffstat (limited to 'c-user/rate-monotonic/background.rst')
| -rw-r--r-- | c-user/rate-monotonic/background.rst | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/c-user/rate-monotonic/background.rst b/c-user/rate-monotonic/background.rst index c81af4e..af54591 100644 --- a/c-user/rate-monotonic/background.rst +++ b/c-user/rate-monotonic/background.rst @@ -222,8 +222,9 @@ assumptions: - The execution time for each task without preemption or interruption is constant and does not vary. -- Any non-periodic tasks in the system are special. These tasks displace - periodic tasks while executing and do not have hard, critical deadlines. +- Any non-periodic tasks in the system are special. These tasks should not + displace periodic tasks while executing and do not have hard, critical + deadlines. Once the basic schedulability analysis is understood, some of the above assumptions can be relaxed and the side-effects accounted for. @@ -290,9 +291,9 @@ by the Processor Utilization Rule, they can still be guaranteed to meet all their deadlines by application of the First Deadline Rule. This rule can be stated as follows: -For a given set of independent periodic tasks, if each task meets its first -deadline when all tasks are started at the same time, then the deadlines will -always be met for any combination of start times. + For a given set of independent periodic tasks, if each task meets its first + deadline when all tasks are started at the same time, then the + deadlines will always be met for any combination of start times. A key point with this rule is that ALL periodic tasks are assumed to start at the exact same instant in time. Although this assumption may seem to be |