Message-ID: <20030214033543.26042.qmail@web13803.mail.yahoo.com>
Date: Thu, 13 Feb 2003 19:35:43 -0800 (PST)
From: William Chow <lilbilchow@yahoo.com>
Subject: missing a wakeup from pending signal
To: linux-kernel@vger.kernel.org
Cc: lilbilchow@yahoo.com
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I am finding that my kernel thread will occasionally
fail to wake up eventhough it has a signal pending.
The thread is calling wait_event_interruptible and
waiting for SIGIO (from the sg driver). I only see it
fail to wake up when performing intensive sg activity.
>From kdb, the task shows the signal was delivered
(sigpending==1 and pending.signal.sig[0]==0x10000000).

So, I was just wondering if anyone was aware of a fix
(I'm using 2.4.18 on i386). A google search failed to
turn up anything obvious. My code is pretty basic
stuff but here the wait loop just in case:

for (;;) {
  gotsig = wait_event_interruptible();
  if (gotsig) {
    sigemptyset(&set);
    spin_lock_irq(&current->sigmask_lock);
    signum = dequeue_signal(&set, &info);
    spin_unlock_irq(&current->sigmask_lock);
    if (signum != SIGIO)
      break;
    process_io();
  }
}

Please CC me in the response. Thanks in advance.

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