StrangeMutex.c

#include "FreeRTOS.h"
#include "task.h"
#include "semphr.h"

#include "Console.h"
#include "config.h"

static SemaphoreHandle_t mutex = NULL;

static void taskStrangeMutexDemo(void * params);

void initStrangeMutexDemo() {
    configASSERT(mutex == NULL);    /* should be called only once */
    configASSERT(mutex = xSemaphoreCreateMutex());
    xTaskCreate(
        taskStrangeMutexDemo, "Strange0", configMINIMAL_STACK_SIZE, NULL, BASE_TASK_PRIO, NULL);
    xTaskCreate(
        taskStrangeMutexDemo, "Strange1", configMINIMAL_STACK_SIZE, NULL, BASE_TASK_PRIO, NULL);
}

static void guardedMethod() {
    con_printf("Task %s is taking the mutex.\n", pcTaskGetTaskName(NULL));
    configASSERT(
        xSemaphoreTake(mutex, portMAX_DELAY));
    con_printf("Task %s has taken the mutex.\n", pcTaskGetTaskName(NULL));
    vTaskDelay(pdMS_TO_TICKS(1000));
    configASSERT(
        xSemaphoreGive(mutex));
    con_printf("Task %s has released the mutex.\n", pcTaskGetTaskName(NULL));
}

static void taskStrangeMutexDemo(void * params) {
    while (1) {
        guardedMethod();
    }
}