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* Copyright (c) 2017 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <ztest.h>
#include "test_sched.h"
/* nrf 51 has lower ram, so creating less number of threads */
#if CONFIG_SRAM_SIZE <= 24
#define NUM_THREAD 2
#elif (CONFIG_SRAM_SIZE <= 32) \
|| defined(CONFIG_SOC_EMSK_EM7D)
#define NUM_THREAD 3
#else
#define NUM_THREAD 10
#endif
#define ITRERATION_COUNT 5
#define BASE_PRIORITY 1
BUILD_ASSERT(NUM_THREAD <= MAX_NUM_THREAD);
/* Semaphore on which Ztest thread wait*/
static K_SEM_DEFINE(sema2, 0, NUM_THREAD);
/* Semaphore on which application threads wait*/
static K_SEM_DEFINE(sema3, 0, NUM_THREAD);
static int thread_idx;
static struct k_thread t[NUM_THREAD];
/* Application thread */
static void thread_tslice(void *p1, void *p2, void *p3)
{
int idx = POINTER_TO_INT(p1);
/* Print New line for last thread */
int thread_parameter = (idx == (NUM_THREAD - 1)) ? '\n' :
(idx + 'A');
while (1) {
/* Prining alphabet corresponding to thread*/
TC_PRINT("%c", thread_parameter);
/* Testing if threads are execueted as per priority*/
zassert_true((idx == thread_idx), NULL);
thread_idx = (thread_idx + 1) % (NUM_THREAD);
/* Realease CPU and give chance to Ztest thread to run*/
k_sem_give(&sema2);
/*Wait for relase of semaphore from Ztest thread*/
k_sem_take(&sema3, K_FOREVER);
}
}
/*test cases*/
/**
*
* @brief Check the behavior of preemptive threads with different priorities
*
* @details Create multiple threads of different priorities - all are preemptive,
* current thread is also made preemptive. Check how the threads get chance to
* execute based on their priorities
*
* @ingroup kernel_sched_tests
*/
void test_priority_scheduling(void)
{
k_tid_t tid[NUM_THREAD];
int old_prio = k_thread_priority_get(k_current_get());
int count = 0;
/* update priority for current thread*/
k_thread_priority_set(k_current_get(),
K_PRIO_PREEMPT(BASE_PRIORITY - 1));
/* Create Threads with different Priority*/
for (int i = 0; i < NUM_THREAD; i++) {
tid[i] = k_thread_create(&t[i], tstacks[i], STACK_SIZE,
thread_tslice, INT_TO_POINTER(i), NULL, NULL,
K_PRIO_PREEMPT(BASE_PRIORITY + i), 0,
K_NO_WAIT);
}
while (count < ITRERATION_COUNT) {
/* Wait for each thread to complete */
for (int i = 0; i < NUM_THREAD; i++) {
k_sem_take(&sema2, K_FOREVER);
}
/* Delay to give chance to last thread to run */
k_sleep(K_MSEC(1));
/* Giving Chance to other threads to run */
for (int i = 0; i < NUM_THREAD; i++) {
k_sem_give(&sema3);
}
count++;
}
/* test case teardown*/
for (int i = 0; i < NUM_THREAD; i++) {
k_thread_abort(tid[i]);
}
/* Set priority of Main thread to its old value */
k_thread_priority_set(k_current_get(), old_prio);
}
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