JOBCTL_STOPPED
#define task_is_stopped(task) ((READ_ONCE(task->jobctl) & JOBCTL_STOPPED) != 0)
#define task_is_stopped_or_traced(task) ((READ_ONCE(task->jobctl) & (JOBCTL_STOPPED | JOBCTL_TRACED)) != 0)
current->jobctl |= JOBCTL_STOPPED;
t->jobctl &= ~(JOBCTL_STOPPED | JOBCTL_TRACED);
task->jobctl &= ~JOBCTL_STOPPED;
current->jobctl |= JOBCTL_STOPPED;
t->jobctl &= ~JOBCTL_STOPPED;