Volatile Variable
// volatile
int flag; // global memory is part of "BSS" section, guaranteed to be zero (unless a bug in startup code)
void flag_setter_task(void *p) {
while (1) {
++flag;
vTaskDelay(1000);
}
}
void flag_checker_task(void *p) {
puts("Task entry");
while (1) {
flag = 0;
while (0 == flag) {
;
}
puts("flag has incremented away from value of 0");
vTaskDelay(1000);
}
}
Interview Questions
- What is a
volatile keyword?
- Given a code snippet, why you cannot set a breakpoint?
- Is
const opposite of volatile?
- What is the point of "
const volatile *variable" ?
- You as a programmer, cannot write a line of code to modify, but maybe DMA or a peripheral behind you can modify it
