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Message-ID: <20080308151022.GA25182@tv-sign.ru>
Date: Sat, 8 Mar 2008 18:10:22 +0300
From: Oleg Nesterov <oleg@...sign.ru>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Ingo Molnar <mingo@...e.hu>, Pavel Emelyanov <xemul@...nvz.org>,
Roland McGrath <roland@...hat.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH 2/6] signals: change send_signal/do_send_sigqueue to take "boolean group" parameter
send_signal() is used either with ->pending or with ->signal->shared_pending.
Change it to take "int group" instead, this argument will be re-used later.
Signed-off-by: Oleg Nesterov <oleg@...sign.ru>
--- 25/kernel/signal.c~2_SS_BOOL_GROUP 2008-03-08 16:16:52.000000000 +0300
+++ 25/kernel/signal.c 2008-03-08 16:26:43.000000000 +0300
@@ -754,18 +754,21 @@ static inline int legacy_queue(struct si
}
static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
- struct sigpending *signals)
+ int group)
{
+ struct sigpending *pending;
struct sigqueue *q;
assert_spin_locked(&t->sighand->siglock);
handle_stop_signal(sig, t);
+
+ pending = group ? &t->signal->shared_pending : &t->pending;
/*
* Short-circuit ignored signals and support queuing
* exactly one non-rt signal, so that we can get more
* detailed information about the cause of the signal.
*/
- if (sig_ignored(t, sig) || legacy_queue(signals, sig))
+ if (sig_ignored(t, sig) || legacy_queue(pending, sig))
return 0;
/*
@@ -793,7 +796,7 @@ static int send_signal(int sig, struct s
(is_si_special(info) ||
info->si_code >= 0)));
if (q) {
- list_add_tail(&q->list, &signals->list);
+ list_add_tail(&q->list, &pending->list);
switch ((unsigned long) info) {
case (unsigned long) SEND_SIG_NOINFO:
q->info.si_signo = sig;
@@ -823,7 +826,7 @@ static int send_signal(int sig, struct s
}
out_set:
- sigaddset(&signals->signal, sig);
+ sigaddset(&pending->signal, sig);
return 1;
}
@@ -864,7 +867,7 @@ specific_send_sig_info(int sig, struct s
{
int ret;
- ret = send_signal(sig, info, t, &t->pending);
+ ret = send_signal(sig, info, t, 0);
if (ret <= 0)
return ret;
@@ -923,7 +926,7 @@ __group_send_sig_info(int sig, struct si
* We always use the shared queue for process-wide signals,
* to avoid several races.
*/
- ret = send_signal(sig, info, p, &p->signal->shared_pending);
+ ret = send_signal(sig, info, p, 1);
if (ret <= 0)
return ret;
@@ -1258,8 +1261,10 @@ void sigqueue_free(struct sigqueue *q)
}
static int do_send_sigqueue(int sig, struct sigqueue *q, struct task_struct *t,
- struct sigpending *pending)
+ int group)
{
+ struct sigpending *pending;
+
handle_stop_signal(sig, t);
if (unlikely(!list_empty(&q->list))) {
@@ -1277,8 +1282,10 @@ static int do_send_sigqueue(int sig, str
return 1;
signalfd_notify(t, sig);
+ pending = group ? &t->signal->shared_pending : &t->pending;
list_add_tail(&q->list, &pending->list);
sigaddset(&pending->signal, sig);
+
return 0;
}
@@ -1300,7 +1307,7 @@ int send_sigqueue(int sig, struct sigque
if (!likely(lock_task_sighand(p, &flags)))
goto out_err;
- ret = do_send_sigqueue(sig, q, p, &p->pending);
+ ret = do_send_sigqueue(sig, q, p, 0);
if (!sigismember(&p->blocked, sig))
signal_wake_up(p, sig == SIGKILL);
@@ -1321,7 +1328,7 @@ send_group_sigqueue(int sig, struct sigq
/* Since it_lock is held, p->sighand cannot be NULL. */
spin_lock_irqsave(&p->sighand->siglock, flags);
- ret = do_send_sigqueue(sig, q, p, &p->signal->shared_pending);
+ ret = do_send_sigqueue(sig, q, p, 1);
__group_complete_signal(sig, p);
--
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