[FreeRTOS] Queue Create

#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
#include "list.h"
#include "supporting_functions.h"


static void vSenderTask(void * pvParameters);
static void vReceiverTask(void * pvParameters);

QueueHandle_t xQueue;

int main()
{
    xQueue = xQueueCreate(5, sizeof(int32_t));

    if (xQueue != NULL)
    {
        xTaskCreate(vSenderTask, "Sender1", 1000, (void*)100, 1, NULL);
        xTaskCreate(vSenderTask, "Sender2", 1000, (void*)200, 1, NULL);

        xTaskCreate(vReceiverTask, "Receiver", 1000, NULL, 2, NULL);

        vTaskStartScheduler();
    }
    else
    {

    }

    for (;;);

    return 0;
}


static void vSenderTask(void * pvParameters)
{
    int32_t lValueToSend;
    BaseType_t xStatus;

    lValueToSend = (int32_t)pvParameters;

    for (;;)
    {
        xStatus = xQueueSendToBack(xQueue, &lValueToSend, 0);
        if (xStatus != pdPASS)
        {
            vPrintString("Could not send to the queue.\n");
        }
    }
}

static void vReceiverTask(void * pvParameters)
{
    int32_t lReceivedValue;
    BaseType_t xStatus;
    const TickType_t xTicksToWait = pdMS_TO_TICKS(100UL);

    for (;;)
    {
        UBaseType_t xItemNum = uxQueueMessagesWaiting(xQueue);
        printf("Queue item number = %d\n", xItemNum);

        xStatus = xQueueReceive(xQueue, &lReceivedValue, xTicksToWait);

        if (xStatus == pdPASS)
        {
            vPrintStringAndNumber("Received = ", lReceivedValue);
        }
        else
        {
            vPrintString("Could not receive from the queue.\n");
        }
    }
}