Please help, im not sure how to fix my code so that it runs properly

Here is the instructions:

TODO:: Find a free pump and fill up using that pump, otherwise wait until a pump becomes

$//$ available.

$//$

$//1)$ You will be using a single mutex and a $32-$bit value to utilize up to $32$ different pumps.

$//$ Each bit in the $32-$bit 'freemask' will represent the status of a single pump $-$ in use

$//$ or not in use. Refer to the documentation if you need a refresher on how to set, check

$//$ and clear individual bits.

$//$

$//2)$ All accesses to shared memory must be thread safe and no two cars should even attempt to

$//$ access the same pump at the same time.

$//$

$//3)$ You will be using the 'fillTankUp' method of the 'Pump' class to simulate a car filling

$//$ up$.$ Filling up must be implemented in such a way that allows for other cars to

$//$ concurrently use the other pumps while a car fills up$.$

$//$

$//4)$ If a car fails to find an available pump it must wait until one becomes available.

$//$

$//5)$ After a car successfully fills up it either must wait for all other cars to fill up OR

$//$ wait until enough time has gone by for all other cars to fill up once. If you choose

$//$ to use the time based algorithm then you'll need to look into the function sleep$\_$for,

$//$ which is found in the std::this$\_$thread namespace. You will need to sleep for a value

$//$ based on the information available to you $($number of cars, number of pumps, how long

$//$ a single car takes to fill up$).$

$//$

$//$ NOTE: You may NOT modify any of the code outside of the TODOs or add any global or static

$//$ variables UNLESS it's required by your algorithm for #$5$ above.

Here is my code:

std::unique$\_$lock lock$(*$getstationMutex$())$;

while $($true$)$

$\{$

$//$iterate through the number of pumps in the station

for $($int i $=0$; i $<$ pumpsInStation; i$++)$

$\{$

$//$check if pump is available

if $($freeMask & $(1<<$ i$))$

$\{$

$//$mark pump as in use

freeMask &$=$ ~$(1<<$ i$)$;

$//$unlock mutex while filling up

lock.unlock$()$;

$//$fill up tank

pumps$[$i$].$fillTankUp$()$;

$//$lock mutex again

lock.lock$()$;

$//$mark pump as free

freeMask $|=(1<<$ i$)$;

$//$notify waiting cars

stationCondition$->$notify$\_$all$()$;

return $0$;

$\}$

$\}$

getStationCondition$()->$wait$($lock$)$;

$\}$

return $0$;