#256 Programming error in QP/C++ posix port

[Anonymous]

It appears a bug in the posix port of QP/C++ was instroduced in version 6.7.0.

In version 6.6.0 the QActive::start function prototype included:

uint_fast16_t stkSize

But in version 6.7.0 it was changed to:

uint_fast16_t const stkSize

Later in the function we have the following:

// stack size not provided?
if (stkSize == 0U) {
    // set the allowed minimum
    stkSize = (uint_fast16_t)PTHREAD_STACK_MIN;
}

We get an error when compiling since we're trying to change a constant variable. Also it looks like this variable isn't actually used in the function. Maybe just a (void*)stkSize; at the top of the function?

[Quantum Leaps]

Yes, this bug has been introduced while trying to satisfy MISRA complance (parameter could be defined const). The bug will be fixed in the next upcoming QP/C++ 6.8.0.

For now, the recommended fix is to remove the code:

// stack size not provided?
if (stkSize == 0U) {
    // set the allowed minimum
    stkSize = (uint_fast16_t)PTHREAD_STACK_MIN;
}

And to add:

(void)stkSize; // unused parameter in the POSIX port

--MMS

[Anonymous]

Thanks! Really appreciate the help!

[Quantum Leaps]

Fixed in QP/C++ 6.8.0.
--MMS