Participate in a group stop
bool task_participate_group_stop(struct task_struct * task);
task
task participating in a group stop
task has JOBCTL_STOP_PENDING set and is participating in a group stop. Group stop states are cleared and the group stop count is consumed if JOBCTL_STOP_CONSUME was set. If the consumption completes the group stop, the appropriate SIGNAL_* flags are set.
Must be called with task->sighand->siglock held.
true if group stop completion should be notified to the parent, false otherwise.