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PROSA  Formally Proven Schedulability Analysis
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Vedant Chavda
PROSA  Formally Proven Schedulability Analysis
Commits
6929caa1
Commit
6929caa1
authored
Jul 24, 2020
by
Vedant Chavda
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29
analysis/facts/model/offset.v
analysis/facts/model/offset.v
+1
1
analysis/facts/model/task_arrivals.v
analysis/facts/model/task_arrivals.v
+3
2
analysis/facts/periodic/arrival_separation.v
analysis/facts/periodic/arrival_separation.v
+5
5
analysis/facts/periodic/sporadic.v
analysis/facts/periodic/sporadic.v
+7
2
analysis/facts/sporadic.v
analysis/facts/sporadic.v
+13
11
model/task/arrival/task_max_inter_arrival.v
model/task/arrival/task_max_inter_arrival.v
+7
6
util/list.v
util/list.v
+2
2
No files found.
analysis/facts/model/offset.v
View file @
6929caa1
...
...
@@ 13,7 +13,7 @@ Section OffsetLemmas.
Context
`
{
JobTask
Job
Task
}.
Context
`
{
JobArrival
Job
}.
(** Consider any
unique arrival sequence with consistent
arrivals, ... *)
(** Consider any
arrival sequence with consistent and nonduplicate
arrivals, ... *)
Variable
arr_seq
:
arrival_sequence
Job
.
Hypothesis
H_consistent_arrivals
:
consistent_arrival_times
arr_seq
.
Hypothesis
H_uniq_arr_seq
:
arrival_sequence_uniq
arr_seq
.
...
...
analysis/facts/model/task_arrivals.v
View file @
6929caa1
...
...
@@ 103,7 +103,7 @@ Section TaskArrivals.
now
rewrite

filter_cat

arrivals_between_cat
.
Qed
.
(** We observe that for any job [j], task arrivals up to [job_arrival j] can be split
(** We observe that for any job [j], task arrivals up to [job_arrival j] can be split
into task arrivals before [job_arrival j] and task arrivals at [job_arrival j]. *)
Lemma
task_arrivals_up_to_cat
:
forall
j
,
...
...
@@ 133,7 +133,8 @@ Section TaskArrivals.
now
apply
arrived_between_implies_in_arrivals
.
Qed
.
(** Unique arrival sequence leads to unique task arrivals. *)
(** An arrival sequence with nonduplicate arrivals implies that the
task arrivals also contain nonduplicate arrivals. *)
Lemma
uniq_task_arrivals
:
forall
j
,
arrives_in
arr_seq
j
>
...
...
analysis/facts/periodic/arrival_separation.v
View file @
6929caa1
...
...
@@ 41,9 +41,9 @@ Section JobArrivalSeparation.
Hypothesis
H_j2_of_task
:
job_task
j2
=
tsk
.
Hypothesis
H_consecutive_jobs
:
job_index
arr_seq
j2
=
job_index
arr_seq
j1
+
1
.
(** We show that if
[j2] is the next job to arrive after [j1]
(i.e., [job_index j2] is one greater than [job_index j1]) then
[j2] arrives one [task_period] after [j1]
. *)
(** We show that if
job [j1] and [j2] are consecutive jobs with [j2]
arriving after [j1], then their arrival times are separated by
their task's period
. *)
Lemma
consecutive_job_separation
:
job_arrival
j2
=
job_arrival
j1
+
task_period
tsk
.
Proof
.
...
...
@@ 60,7 +60,7 @@ Section JobArrivalSeparation.
(** In this section we show that for two unequal jobs of a task,
there exists a nonzero multiple of their task's period which separates
their arrival times. *)
Section
ArrivalSeparation
OfJobs
.
Section
ArrivalSeparation
WithGivenIndexDifference
.
(** Consider any two _consecutive_ jobs [j1] and [j2] of task [tsk]
that stem from the arrival sequence. *)
...
...
@@ 117,7 +117,7 @@ Section JobArrivalSeparation.
}
Qed
.
End
ArrivalSeparation
OfJobs
.
End
ArrivalSeparation
WithGivenIndexDifference
.
(** Consider any two _distinct_ jobs [j1] and [j2] of task [tsk]
that stem from the arrival sequence. *)
...
...
analysis/facts/periodic/sporadic.v
View file @
6929caa1
...
...
@@ 16,8 +16,8 @@ Section PeriodicTasksAsSporadicTasks.
(** Any type of periodic tasks ... *)
Context
{
Task
:
TaskType
}
`
{
PeriodicModel
Task
}.
(** ... and their corresponding jobs from a consistent
and unique arrival sequence
... *)
(** ... and their corresponding jobs from a consistent
arrival sequence with
nonduplicate arrivals
... *)
Context
{
Job
:
JobType
}
`
{
JobTask
Job
Task
}
`
{
JobArrival
Job
}.
Variable
arr_seq
:
arrival_sequence
Job
.
...
...
@@ 62,10 +62,15 @@ Section PeriodicTasksAsSporadicTasks.
(** For convenience, we state these obvious correspondences also at the level
of entire task sets. *)
(** First, we show that all tasks in a task set with valid periods
also have valid min interarrival times. *)
Remark
valid_periods_are_valid_inter_arrival_times
:
forall
ts
,
valid_periods
ts
>
valid_taskset_inter_arrival_times
ts
.
Proof
.
trivial
.
Qed
.
(** Second, we show that each task in a periodic task set respects
the sporadic task model. *)
Remark
periodic_task_sets_respect_sporadic_task_model
:
forall
ts
,
valid_periods
ts
>
...
...
analysis/facts/sporadic.v
View file @
6929caa1
...
...
@@ 137,8 +137,8 @@ Section SporadicArrivals.
Hypothesis
H_j1_task
:
job_task
j1
=
tsk
.
Hypothesis
H_j2_task
:
job_task
j2
=
tsk
.
(** We show that a sporadic task with valid
[task_min_inter_arrival_time]
cannot
have more than one job arriving at any time. *)
(** We show that a sporadic task with valid
min interarrival time
cannot
have more than one job arriving at any time. *)
Lemma
size_task_arrivals_at_leq_one
:
(
exists
j
,
size
(
task_arrivals_at_job_arrival
arr_seq
j
)
>
1
/\
...
...
@@ 159,8 +159,9 @@ Section SporadicArrivals.
now
ssromega
.
Qed
.
(** No job of task [tsk] arrives at [job_arrival j1] other
than [j1] itself. *)
(** We show that no jobs of the task [tsk] other than [j1] arrive at
the same time as [j1], and thus the task arrivals at [job arrival j1]
consists only of job [j1]. *)
Lemma
only_j_in_task_arrivals_at_j
:
task_arrivals_at_job_arrival
arr_seq
j1
=
[
::
j1
].
Proof
.
...
...
@@ 180,9 +181,9 @@ Section SporadicArrivals.
now
repeat
split
=>
//
;
try
rewrite
H_j1_task
.
Qed
.
(**
Index of any job [j] in the sequence
[task_arrivals_at arr_seq (job_task j) (job_arrival j)]
i
s zero.
*)
(**
We show that a job [j1] is the first job that arrives
in task arrivals at [job_arrival j1] by showing that the
i
ndex of job [j1] in [task_arrivals_at_job_arrival arr_seq j1] is 0.
*)
Lemma
index_j_in_task_arrivals_at
:
index
j1
(
task_arrivals_at_job_arrival
arr_seq
j1
)
=
0
.
Proof
.
...
...
@@ 207,8 +208,8 @@ Section SporadicArrivals.
now
ssromega
.
Qed
.
(** We show that
[task_arrivals_at_job_arrival arr_seq j1] can be
written in terms of [task_arrivals_between
]. *)
(** We show that
task arrivals at [job_arrival j1] can be written as
task arrivals between [job_arrival j1] and [job_arrival j1 + 1
]. *)
Lemma
task_arrivals_at_as_task_arrivals_between
:
task_arrivals_at_job_arrival
arr_seq
j1
=
task_arrivals_between
arr_seq
tsk
(
job_arrival
j1
)
(
job_arrival
j1
).+
1
.
Proof
.
...
...
@@ 216,8 +217,9 @@ Section SporadicArrivals.
now
rewrite
big_nat1
H_j1_task
.
Qed
.
(** The sequence [task_arrivals_up_to_job_arrival arr_seq j] can be written as a concatenation
of [task_arrivals_up_to_job_arrival arr_seq (prev_job j)] and [::j]. *)
(** We show that the task arrivals up to the previous job [j1] concatenated with
the sequence [::j1] (the sequence containing only the job [j1]) is same as
task arrivals up to [job_arrival j1]. *)
Lemma
prev_job_cat
:
job_index
arr_seq
j1
>
0
>
task_arrivals_up_to_job_arrival
arr_seq
(
prev_job
arr_seq
j1
)
++
[
::
j1
]
=
task_arrivals_up_to_job_arrival
arr_seq
j1
.
...
...
model/task/arrival/task_max_inter_arrival.v
View file @
6929caa1
Require
Export
prosa
.
model
.
task
.
concept
.
Require
Export
prosa
.
model
.
task
.
arrivals
.
(** * Task Max Inter
Arrival *)
(** * Task Max Inter

Arrival *)
(** We define a taskmodel parameter [task_max_inter_arrival_time] as
the maximum time difference between the arrivals of consecutive jobs. *)
...
...
@@ 9,7 +9,7 @@ Class TaskMaxInterArrival (Task : TaskType) :=
task_max_inter_arrival_time
:
Task
>
duration
.
(** In the following section, we define two properties that a task must satisfy
for its max interarrival time to be valid. *)
for its max
imum
interarrival time to be valid. *)
Section
ValidTaskMaxInterArrival
.
(** Consider any type of tasks, ... *)
...
...
@@ 24,13 +24,14 @@ Section ValidTaskMaxInterArrival.
(** ... and any arrival sequence. *)
Variable
arr_seq
:
arrival_sequence
Job
.
(** Firstly, the task max interarrival time for a task is positive. *)
(** Firstly, the task max
imum
interarrival time for a task is positive. *)
Definition
positive_task_max_inter_arrival_time
(
tsk
:
Task
)
:
=
task_max_inter_arrival_time
tsk
>
0
.
(** Secondly, for any job [j] of a task [tsk] except the first one, there exists
a job [j'] of task [tsk] that arrives before [j] with the arrival
separation between [j] and [j'] being at most [task_max_inter_arrival_time tsk]. *)
(** Secondly, for any job [j] (with a positive [job_index]) of a task [tsk],
there exists a job [j'] of task [tsk] that arrives before [j]
with [j] not arriving any later than the task maximum interarrival
time of [tsk] after [j']. *)
Definition
arr_sep_task_max_inter_arrival
(
tsk
:
Task
)
:
=
forall
(
j
:
Job
),
arrives_in
arr_seq
j
>
...
...
util/list.v
View file @
6929caa1
...
...
@@ 426,8 +426,8 @@ Section AdditionalLemmas.
now
rewrite

EQ_a

EQ_b
EQ
.
Qed
.
(** We
prove that the element given by [nth d xs n] in a sequence [xs] either
lies in [xs] or is equal to [d]
. *)
(** We
show that the nth element in a sequence lies in the
sequence or is the default element
. *)
Lemma
default_or_in
:
forall
(
T
:
eqType
)
(
n
:
nat
)
(
d
:
T
)
(
xs
:
seq
T
),
nth
d
xs
n
=
d
\/
nth
d
xs
n
\
in
xs
.
...
...
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