Workflow

1.
Enter a critical section to disable global interrupts.
```
system_interrupt_enter_critical_section();
```
Note: Critical sections may be nested if desired; if nested, global interrupts will only be re-enabled once the outer-most critical section has completed.
2.
Check a global shared flag and perform a response. This code may be any critical code that requires exclusive access to all resources without the possibility of interruption.
```
if (is_ready == true) {
    /* Do something in response to the global shared flag */
    is_ready = false;
}
```
3.
Exit the critical section to re-enable global interrupts.
```
system_interrupt_leave_critical_section();
```