22.8.1.2.2 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();