--- 25/include/linux/sched.h~1_SIGCONT_IMPL 2008-02-17 23:40:09.000000000 +0300 +++ 25/include/linux/sched.h 2008-03-03 13:40:14.000000000 +0300 @@ -555,6 +555,12 @@ struct signal_struct { #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ +/* + * Pending notifications to parent. + */ +#define SIGNAL_CLD_STOPPED 0x00000010 +#define SIGNAL_CLD_CONTINUED 0x00000020 +#define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) /* If true, all threads except ->group_exit_task have pending SIGKILL */ static inline int signal_group_exit(const struct signal_struct *sig) --- 25/kernel/signal.c~1_SIGCONT_IMPL 2008-02-17 23:40:09.000000000 +0300 +++ 25/kernel/signal.c 2008-03-03 13:51:55.000000000 +0300 @@ -595,10 +595,8 @@ static void handle_stop_signal(int sig, * the SIGCHLD was pending on entry to this kill. */ p->signal->group_stop_count = 0; - p->signal->flags = SIGNAL_STOP_CONTINUED; - spin_unlock(&p->sighand->siglock); - do_notify_parent_cldstop(p, CLD_STOPPED); - spin_lock(&p->sighand->siglock); + p->signal->flags = SIGNAL_STOP_CONTINUED | + SIGNAL_CLD_STOPPED; } rm_from_queue(SIG_KERNEL_STOP_MASK, &p->signal->shared_pending); t = p; @@ -635,25 +633,23 @@ static void handle_stop_signal(int sig, * We were in fact stopped, and are now continued. * Notify the parent with CLD_CONTINUED. */ - p->signal->flags = SIGNAL_STOP_CONTINUED; + p->signal->flags = SIGNAL_STOP_CONTINUED | + SIGNAL_CLD_CONTINUED; p->signal->group_exit_code = 0; - spin_unlock(&p->sighand->siglock); - do_notify_parent_cldstop(p, CLD_CONTINUED); - spin_lock(&p->sighand->siglock); } else { /* * We are not stopped, but there could be a stop * signal in the middle of being processed after * being removed from the queue. Clear that too. */ - p->signal->flags = 0; + p->signal->flags &= ~SIGNAL_STOP_DEQUEUED; } } else if (sig == SIGKILL) { /* * Make sure that any pending stop signal already dequeued * is undone by the wakeup for SIGKILL. */ - p->signal->flags = 0; + p->signal->flags &= ~SIGNAL_STOP_DEQUEUED; } } @@ -1761,6 +1757,19 @@ int get_signal_to_deliver(siginfo_t *inf relock: spin_lock_irq(¤t->sighand->siglock); + + if (unlikely(current->signal->flags & SIGNAL_CLD_MASK)) { + int why = (current->signal->flags & SIGNAL_STOP_CONTINUED) + ? CLD_CONTINUED : CLD_STOPPED; + current->signal->flags &= ~SIGNAL_CLD_MASK; + spin_unlock_irq(¤t->sighand->siglock); + + read_lock(&tasklist_lock); + do_notify_parent_cldstop(current->group_leader, why); + read_unlock(&tasklist_lock); + goto relock; + } + for (;;) { struct k_sigaction *ka;