tic toc in embedded matlab function showing strange results?

I have created a matlab function in Simulink (partially) containing the code below. The model has an input X. Based on this input a switch is operated by the output y. A value of 1 switches it on and a value of 0 switches it off. What I want the function to do is the following:

- If y = 0, and X is still within the threshold, at the first occurence of an outside value I want to start a real-time timer. If that timer reaches a value larger than t_init I want it to switch on.

- If y = 0, and X is already outside the threshold, I want the timer to keep counting till it reaches t_init.

- If y = 1, and X is outside the threshold, at the first occurence of an inside value I want to start a real-time timer. If that timer reaches a value larger than t_term I want it to switch off.

- If y = 1, and X is already inside the threshold, I want the timer to keep counting till it reached t_term.

I added coder.extrinsic(tic) and coder.extrinsic(toc). I also tried using clock in combination with etime but that didn't work either.

The problem for now is that the value for elapsedTime_init and elapsedTime_term keep switching between ~ 3.5*10^5 and 0. It might be something obvious but I can't seem to figure out what the problem is. Please help me, cause I'm seriously stuck.

t_term = 0;
t_init = 0;
elapsedTime_init = 0;
elapsedTime_term = 0;
t_start = tic;
elapsedTime_init = double(toc(t_start));
elapsedTime_term = double(toc(t_start));
k = zeros(10,1);
i = length(k);
y = 0;

for ii = 2:i
    k(ii,1) = k_old(ii-1,1); % remove 1 value and make space for new value at first row
end

if X <= Lower_threshold_value && X => Upper_threshold_value
    k(1) = 0;
    if sum(k_old) >= 7 && y_old == 1
        t_term = typecast(tic,'double');
    else
        t_term = t_term_old;
    end
    elapsedTime_term = toc(typecast(t_term,'uint64'));
    if elapsedTime_term >= Time_term
        y = 0;
    else
        y = y_old;
    end
else
    k(1) = 1;
    if sum(k_old) <= 3 && y_old == 0
        t_init = typecast(tic,'double');
    else
        t_init = t_init_old;
    end
    elapsedTime_init = toc(typecast(t_term,'uint64'));
    if elapsedTime_init >= Time_init
        y = 1;
    else
        y = y_old;
    end
end