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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** Thread-Metric Component */
/** */
/** Preemptive Scheduling Test */
/** */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* tm_preemptive_scheduling_test PORTABLE C */
/* 6.1.7 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This file defines the preemptive scheduling test. */
/* */
/**************************************************************************/
#include "tm_api.h"
/* Define the counters used in the demo application... */
unsigned long tm_preemptive_thread_0_counter;
unsigned long tm_preemptive_thread_1_counter;
unsigned long tm_preemptive_thread_2_counter;
unsigned long tm_preemptive_thread_3_counter;
unsigned long tm_preemptive_thread_4_counter;
/* Define the test thread prototypes. */
void tm_preemptive_thread_0_entry(void);
void tm_preemptive_thread_1_entry(void);
void tm_preemptive_thread_2_entry(void);
void tm_preemptive_thread_3_entry(void);
void tm_preemptive_thread_4_entry(void);
/* Define the reporting thread prototype. */
void tm_preemptive_thread_report(void);
/* Define the initialization prototype. */
void tm_preemptive_scheduling_initialize(void);
/* Define main entry point. */
void tm_main()
{
/* Initialize the test. */
tm_initialize(tm_preemptive_scheduling_initialize);
}
/* Define the preemptive scheduling test initialization. */
void tm_preemptive_scheduling_initialize(void)
{
/* Create thread 0 at priority 10. */
tm_thread_create(0, 10, tm_preemptive_thread_0_entry);
/* Create thread 1 at priority 9. */
tm_thread_create(1, 9, tm_preemptive_thread_1_entry);
/* Create thread 2 at priority 8. */
tm_thread_create(2, 8, tm_preemptive_thread_2_entry);
/* Create thread 3 at priority 7. */
tm_thread_create(3, 7, tm_preemptive_thread_3_entry);
/* Create thread 4 at priority 6. */
tm_thread_create(4, 6, tm_preemptive_thread_4_entry);
/* Resume just thread 0. */
tm_thread_resume(0);
/* Create the reporting thread. It will preempt the other
threads and print out the test results. */
tm_thread_create(5, 2, tm_preemptive_thread_report);
tm_thread_resume(5);
}
/* Define the first preemptive thread. */
void tm_preemptive_thread_0_entry(void)
{
while(1)
{
/* Resume thread 1. */
tm_thread_resume(1);
/* We won't get back here until threads 1, 2, 3, and 4 all execute and
self-suspend. */
/* Increment this thread's counter. */
tm_preemptive_thread_0_counter++;
}
}
/* Define the second preemptive thread. */
void tm_preemptive_thread_1_entry(void)
{
while(1)
{
/* Resume thread 2. */
tm_thread_resume(2);
/* We won't get back here until threads 2, 3, and 4 all execute and
self-suspend. */
/* Increment this thread's counter. */
tm_preemptive_thread_1_counter++;
/* Suspend self! */
tm_thread_suspend(1);
}
}
/* Define the third preemptive thread. */
void tm_preemptive_thread_2_entry(void)
{
while(1)
{
/* Resume thread 3. */
tm_thread_resume(3);
/* We won't get back here until threads 3 and 4 execute and
self-suspend. */
/* Increment this thread's counter. */
tm_preemptive_thread_2_counter++;
/* Suspend self! */
tm_thread_suspend(2);
}
}
/* Define the fourth preemptive thread. */
void tm_preemptive_thread_3_entry(void)
{
while(1)
{
/* Resume thread 4. */
tm_thread_resume(4);
/* We won't get back here until thread 4 executes and
self-suspends. */
/* Increment this thread's counter. */
tm_preemptive_thread_3_counter++;
/* Suspend self! */
tm_thread_suspend(3);
}
}
/* Define the fifth preemptive thread. */
void tm_preemptive_thread_4_entry(void)
{
while(1)
{
/* Increment this thread's counter. */
tm_preemptive_thread_4_counter++;
/* Self suspend thread 4. */
tm_thread_suspend(4);
}
}
/* Define the preemptive test reporting thread. */
void tm_preemptive_thread_report(void)
{
unsigned long total;
unsigned long relative_time;
unsigned long last_total;
unsigned long average;
/* Initialize the last total. */
last_total = 0;
/* Initialize the relative time. */
relative_time = 0;
while(1)
{
/* Sleep to allow the test to run. */
tm_thread_sleep(TM_TEST_DURATION);
/* Increment the relative time. */
relative_time = relative_time + TM_TEST_DURATION;
/* Print results to the stdio window. */
printf("**** Thread-Metric Preemptive Scheduling Test **** Relative Time: %lu\n", relative_time);
/* Calculate the total of all the counters. */
total = tm_preemptive_thread_0_counter + tm_preemptive_thread_1_counter + tm_preemptive_thread_2_counter
+ tm_preemptive_thread_3_counter + tm_preemptive_thread_4_counter;
/* Calculate the average of all the counters. */
average = total/5;
/* See if there are any errors. */
if ((tm_preemptive_thread_0_counter < (average - 1)) ||
(tm_preemptive_thread_0_counter > (average + 1)) ||
(tm_preemptive_thread_1_counter < (average - 1)) ||
(tm_preemptive_thread_1_counter > (average + 1)) ||
(tm_preemptive_thread_2_counter < (average - 1)) ||
(tm_preemptive_thread_2_counter > (average + 1)) ||
(tm_preemptive_thread_3_counter < (average - 1)) ||
(tm_preemptive_thread_3_counter > (average + 1)) ||
(tm_preemptive_thread_4_counter < (average - 1)) ||
(tm_preemptive_thread_4_counter > (average + 1)))
{
printf("ERROR: Invalid counter value(s). Preemptive counters should not be more that 1 different than the average!\n");
}
/* Show the time period total. */
printf("Time Period Total: %lu\n\n", total - last_total);
/* Save the last total. */
last_total = total;
}
}
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