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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
*
* 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 */
/** */
/** Interrupt Preemption Processing Test */
/** */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* tm_interrupt_preemption_processing_test PORTABLE C */
/* 6.1.7 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This file defines the preemptive scheduling test. */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 10-15-2021 William E. Lamie Initial Version 6.1.7 */
/* */
/**************************************************************************/
#include "tm_api.h"
/* Define the counters used in the demo application... */
unsigned long tm_interrupt_preemption_thread_0_counter;
unsigned long tm_interrupt_preemption_thread_1_counter;
unsigned long tm_interrupt_preemption_handler_counter;
/* Define the test thread prototypes. */
void tm_interrupt_preemption_thread_0_entry(void);
void tm_interrupt_preemption_thread_1_entry(void);
void tm_interrupt_preemption_handler_entry(void);
/* Define the reporting thread prototype. */
void tm_interrupt_preemption_thread_report(void);
/* Define the interrupt handler. This must be called from the RTOS. */
void tm_interrupt_preemption_handler(void);
/* Define the initialization prototype. */
void tm_interrupt_preemption_processing_initialize(void);
/* Define main entry point. */
void tm_main()
{
/* Initialize the test. */
tm_initialize(tm_interrupt_preemption_processing_initialize);
}
/* Define the interrupt processing test initialization. */
void tm_interrupt_preemption_processing_initialize(void)
{
/* Create interrupt thread at priority 3. */
tm_thread_create(0, 3, tm_interrupt_preemption_thread_0_entry);
/* Create thread that generates the interrupt at priority 10. */
tm_thread_create(1, 10, tm_interrupt_preemption_thread_1_entry);
/* Resume just thread 1. */
tm_thread_resume(1);
/* Create the reporting thread. It will preempt the other
threads and print out the test results. */
tm_thread_create(5, 2, tm_interrupt_preemption_thread_report);
tm_thread_resume(5);
}
/* Define the interrupt thread. This thread is resumed from the
interrupt handler. It runs and suspends. */
void tm_interrupt_preemption_thread_0_entry(void)
{
while(1)
{
/* Increment this thread's counter. */
tm_interrupt_preemption_thread_0_counter++;
/* Suspend. This will allow the thread generating the
interrupt to run again. */
tm_thread_suspend(0);
}
}
/* Define the thread that generates the interrupt. */
void tm_interrupt_preemption_thread_1_entry(void)
{
while(1)
{
/* Force an interrupt. The underlying RTOS must see that the
the interrupt handler is called from the appropriate software
interrupt or trap. */
TM_CAUSE_INTERRUPT
/* We won't get back here until the interrupt processing is complete,
including the execution of the higher priority thread made ready
by the interrupt. */
/* Increment this thread's counter. */
tm_interrupt_preemption_thread_1_counter++;
}
}
/* Define the interrupt handler. This must be called from the RTOS trap handler.
To be fair, it must behave just like a processor interrupt, i.e. it must save
the full context of the interrupted thread during the preemption processing. */
void tm_interrupt_preemption_handler(void)
{
/* Increment the interrupt count. */
tm_interrupt_preemption_handler_counter++;
/* Resume the higher priority thread from the ISR. */
tm_thread_resume(0);
}
/* Define the interrupt test reporting thread. */
void tm_interrupt_preemption_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 Interrupt Preemption Processing Test **** Relative Time: %lu\n", relative_time);
/* Calculate the total of all the counters. */
total = tm_interrupt_preemption_thread_0_counter + tm_interrupt_preemption_thread_1_counter + tm_interrupt_preemption_handler_counter;
/* Calculate the average of all the counters. */
average = total/3;
/* See if there are any errors. */
if ((tm_interrupt_preemption_thread_0_counter < (average - 1)) ||
(tm_interrupt_preemption_thread_0_counter > (average + 1)) ||
(tm_interrupt_preemption_thread_1_counter < (average - 1)) ||
(tm_interrupt_preemption_thread_1_counter > (average + 1)) ||
(tm_interrupt_preemption_handler_counter < (average - 1)) ||
(tm_interrupt_preemption_handler_counter > (average + 1)))
{
printf("ERROR: Invalid counter value(s). Interrupt processing test has failed!\n");
}
/* Show the total interrupts for the time period. */
printf("Time Period Total: %lu\n\n", tm_interrupt_preemption_handler_counter - last_total);
/* Save the last total number of interrupts. */
last_total = tm_interrupt_preemption_handler_counter;
}
}
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