blob: d4afde4ab81f9440174eaf093e1bfcd064348c8c [file] [log] [blame]
/* main.c - Hello World demo */
/*
* Copyright (c) 2012-2014 Wind River Systems, Inc.
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/kernel.h>
#include <zephyr/sys/printk.h>
/*
* The hello world demo has two threads that utilize semaphores and sleeping
* to take turns printing a greeting message at a controlled rate. The demo
* shows both the static and dynamic approaches for spawning a thread; a real
* world application would likely use the static approach for both threads.
*/
#define PIN_THREADS (IS_ENABLED(CONFIG_SMP) && IS_ENABLED(CONFIG_SCHED_CPU_MASK))
/* size of stack area used by each thread */
#define STACKSIZE 1024
/* scheduling priority used by each thread */
#define PRIORITY 7
/* delay between greetings (in ms) */
#define SLEEPTIME 500
/*
* @param my_name thread identification string
* @param my_sem thread's own semaphore
* @param other_sem other thread's semaphore
*/
void helloLoop(const char *my_name,
struct k_sem *my_sem, struct k_sem *other_sem)
{
const char *tname;
uint8_t cpu;
struct k_thread *current_thread;
while (1) {
/* take my semaphore */
k_sem_take(my_sem, K_FOREVER);
current_thread = k_current_get();
tname = k_thread_name_get(current_thread);
#if CONFIG_SMP
cpu = arch_curr_cpu()->id;
#else
cpu = 0;
#endif
/* say "hello" */
if (tname == NULL) {
printk("%s: Hello World from cpu %d on %s!\n",
my_name, cpu, CONFIG_BOARD);
} else {
printk("%s: Hello World from cpu %d on %s!\n",
tname, cpu, CONFIG_BOARD);
}
/* wait a while, then let other thread have a turn */
k_busy_wait(100000);
k_msleep(SLEEPTIME);
k_sem_give(other_sem);
}
}
/* define semaphores */
K_SEM_DEFINE(threadA_sem, 1, 1); /* starts off "available" */
K_SEM_DEFINE(threadB_sem, 0, 1); /* starts off "not available" */
/* threadB is a dynamic thread that is spawned by threadA */
void threadB(void *dummy1, void *dummy2, void *dummy3)
{
ARG_UNUSED(dummy1);
ARG_UNUSED(dummy2);
ARG_UNUSED(dummy3);
/* invoke routine to ping-pong hello messages with threadA */
helloLoop(__func__, &threadB_sem, &threadA_sem);
}
K_THREAD_STACK_DEFINE(threadA_stack_area, STACKSIZE);
static struct k_thread threadA_data;
K_THREAD_STACK_DEFINE(threadB_stack_area, STACKSIZE);
static struct k_thread threadB_data;
/* threadA is a static thread that is spawned automatically */
void threadA(void *dummy1, void *dummy2, void *dummy3)
{
ARG_UNUSED(dummy1);
ARG_UNUSED(dummy2);
ARG_UNUSED(dummy3);
/* invoke routine to ping-pong hello messages with threadB */
helloLoop(__func__, &threadA_sem, &threadB_sem);
}
void main(void)
{
k_thread_create(&threadA_data, threadA_stack_area,
K_THREAD_STACK_SIZEOF(threadA_stack_area),
threadA, NULL, NULL, NULL,
PRIORITY, 0, K_FOREVER);
k_thread_name_set(&threadA_data, "thread_a");
#if PIN_THREADS
if (arch_num_cpus() > 1) {
k_thread_cpu_pin(&threadA_data, 0);
}
#endif
k_thread_create(&threadB_data, threadB_stack_area,
K_THREAD_STACK_SIZEOF(threadB_stack_area),
threadB, NULL, NULL, NULL,
PRIORITY, 0, K_FOREVER);
k_thread_name_set(&threadB_data, "thread_b");
#if PIN_THREADS
if (arch_num_cpus() > 1) {
k_thread_cpu_pin(&threadB_data, 1);
}
#endif
k_thread_start(&threadA_data);
k_thread_start(&threadB_data);
}