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SPDX-License-Identifier: CC-BY-SA-4.0 OR BSD-2-Clause
copyrights:
- Copyright (C) 2021 embedded brains GmbH (http://www.embedded-brains.de)
enabled-by: true
links:
- role: requirement-refinement
uid: perf-runtime
- role: runtime-measurement-request
uid: ../val/perf
non-functional-type: performance-runtime
params: {}
rationale: null
references: []
requirement-type: non-functional
test-body:
brief: |
Obtain the unavailable mutex and wait forever.
code: |
ctx->begin = T_tick();
ctx->status = rtems_semaphore_obtain(
ctx->mutex_id,
RTEMS_WAIT,
RTEMS_NO_TIMEOUT
);
description: null
test-cleanup: null
test-prepare: null
test-setup:
brief: |
Make the mutex unavailable.
code: |
Send( ctx, EVENT_OBTAIN );
SetPriority( ctx->worker_id, PRIO_LOW );
Send( ctx, EVENT_END | EVENT_RELEASE );
description: null
test-teardown:
brief: |
Set the measured runtime. Restore the worker priority. Release the mutex.
Discard samples interrupted by a clock tick.
code: |
T_quiet_rsc( ctx->status, RTEMS_SUCCESSFUL );
*delta = ctx->end - ctx->begin;
SetPriority( ctx->worker_id, PRIO_HIGH );
ReleaseMutex( ctx->mutex_id );
return tic == toc;
description: null
text: |
Let U and V be two tasks with the same home scheduler. Let :math:`B`
be a time point measured by U right before a call to
${../if/obtain:/name} which blocks on the mutex with no timeout. Let
:math:`E` be a time point measured by V right after the first context
switch after :math:`B`.
While the execution environment is ${.:/environment}, while the semaphore is
a priority inheritance mutex, while the measurement sample is :math:`E - B`,
when exactly ${../val/perf:/params/sample-count} samples are collected, the
${.:/limit-kind} shall be ${.:/limit-condition}.
type: requirement
|
