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signals: document CLD_CONTINUED notification mechanics

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A couple of small comments about how CLD_CONTINUED notification works.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2008-04-30 00:53:00 -07:00 committed by Linus Torvalds
parent 7e695a5ef5
commit 021e1ae3d8
1 changed files with 10 additions and 1 deletions
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11
kernel/signal.c
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@ -633,6 +633,11 @@ static int prepare_signal(int sig, struct task_struct *p)
why |= SIGNAL_CLD_STOPPED;
if (why) {
/*
* The first thread which returns from finish_stop()
* will take ->siglock, notice SIGNAL_CLD_MASK, and
* notify its parent. See get_signal_to_deliver().
*/
signal->flags = why | SIGNAL_STOP_CONTINUED;
signal->group_stop_count = 0;
signal->group_exit_code = 0;
@ -1694,7 +1699,11 @@ int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka,
try_to_freeze();
spin_lock_irq(&sighand->siglock);
/*
* Every stopped thread goes here after wakeup. Check to see if
* we should notify the parent, prepare_signal(SIGCONT) encodes
* the CLD_ si_code into SIGNAL_CLD_MASK bits.
*/
if (unlikely(signal->flags & SIGNAL_CLD_MASK)) {
int why = (signal->flags & SIGNAL_STOP_CONTINUED)
? CLD_CONTINUED : CLD_STOPPED;