path: root/spec/rtems/message/req/perf-send-preempt.yml

SPDX-License-Identifier: CC-BY-SA-4.0 OR BSD-2-Clause
copyrights:
- Copyright (C) 2021 embedded brains GmbH (http://www.embedded-brains.de)
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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: |
    Send a message.
  code: |
    uint64_t message;

    ctx->begin = T_tick();
    ctx->status = rtems_message_queue_send(
      ctx->queue_id,
      &message,
      sizeof( message )
    );
  description: null
test-cleanup: null
test-prepare: null
test-setup:
  brief: |
    Let the worker wait on the message queue.
  code: |
    Send( ctx, EVENT_RECEIVE | EVENT_RECEIVE_END );
  description: null
test-teardown:
  brief: |
    Set the measured runtime.  Discard samples interrupted by a clock tick.
  code: |
    T_quiet_rsc_success( ctx->status );

    *delta = ctx->end - ctx->begin;

    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/send:/name}
  which unblocks the waiting task V which does preempt the caller.  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 a message queue
  is empty, while only task V waits on the message queue, 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