Why memory management prevents runtime crashes in FreeRTOS - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to allocate memory safely in FreeRTOS.

FreeRTOS

void *ptr = pvPortMalloc([1]);

Drag options to blanks, or click blank then click option'

Asize

BNULL

C0

Dfree

Attempts:

3 left

💡 Hint

Common Mistakes

Passing NULL or zero causes no memory to be allocated.

Using size tells FreeRTOS how much memory to allocate, preventing errors.

2fill in blank

medium

Complete the code to check if memory allocation was successful.

FreeRTOS

if (ptr == [1]) {
    // handle error
}

Drag options to blanks, or click blank then click option'

Aptr

B0

CNULL

Dsize

Attempts:

3 left

💡 Hint

Common Mistakes

Checking against zero or the pointer itself instead of NULL.

FreeRTOS returns NULL if memory allocation fails, so checking for NULL prevents crashes.

3fill in blank

hard

Fix the error in the code to free allocated memory correctly.

FreeRTOS

vPortFree([1]);

Drag options to blanks, or click blank then click option'

Aptr

Bsize

Cfree

DNULL

Attempts:

3 left

💡 Hint

Common Mistakes

Passing NULL or size instead of the pointer.

You must pass the pointer returned by pvPortMalloc to vPortFree to release memory properly.

4fill in blank

hard

Fill both blanks to create a safe memory allocation and check.

FreeRTOS

void *ptr = pvPortMalloc([1]);
if (ptr == [2]) {
    // handle error
}

Drag options to blanks, or click blank then click option'

Asize

BNULL

C0

Dptr

Attempts:

3 left

💡 Hint

Common Mistakes

Using zero or ptr instead of size and NULL.

First, allocate memory with size. Then check if ptr is NULL to avoid crashes.

5fill in blank

hard

Fill all three blanks to allocate, check, and free memory safely.

FreeRTOS

void *ptr = pvPortMalloc([1]);
if (ptr == [2]) {
    // handle error
} else {
    vPortFree([3]);
}

Drag options to blanks, or click blank then click option'

Asize

BNULL

Cptr

Dfree

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up variables or forgetting to check for NULL.

Allocate memory with size, check if ptr is NULL, then free the allocated ptr to prevent leaks and crashes.