source: rtems-central/spec/rtems/message/req/perf-send-other-cpu.yml @ 9d7f2a1

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: RTEMS_SMP
limits: {}
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:
  brief: |
    Move worker to scheduler A.
  code: |
    SetScheduler( ctx->worker_id, SCHEDULER_A_ID, PRIO_HIGH );
  description: null
test-prepare:
  brief: |
    Move worker to scheduler B.
  code: |
    SetScheduler( ctx->worker_id, SCHEDULER_B_ID, PRIO_NORMAL );
  description: null
test-setup:
  brief: |
    Let the worker wait on the message queue.
  code: |
    Send( ctx, EVENT_RECEIVE | EVENT_RECEIVE_END );
    WaitForNextTask( 1, ctx->worker_id );
  description: null
test-teardown:
  brief: |
    Set the measured runtime.  Make sure the worker waits for the next event.
    Discard samples interrupted by a clock tick.
  code: |
    T_quiet_rsc_success( ctx->status );

    *delta = ctx->end - ctx->begin;
    WaitForNextTask( 1, ctx->worker_id );

    return tic == toc;
  description: null
text: |
  Let ``U` and `V`` be two tasks with distinct home schedulers.  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 is scheduled on another
  processor.  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