mirror of https://github.com/postgres/postgres
Add WSACancelBlockingCall TODO.detail item.
This commit is contained in:
Bruce Momjian
parent
e166574a1d
commit
07408e841d
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@ -0,0 +1,535 @@
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From pgsql-bugs-owner+M14436@postgresql.org Tue Feb 21 22:21:37 2006
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Subject: [BUGS] FATAL: semctl(1672698088, 12, SETVAL, 0) failed
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Date: Wed, 22 Feb 2006 11:17:51 +0800
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Status: ORr
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I encountered an error when I fast shutdown 8.1.1 on Win2k:
|
||||
|
||||
FATAL: semctl(1672698088, 12, SETVAL, 0) failed: A blocking operation
|
||||
was interrupted by a call to WSACancelBlockingCall.
|
||||
|
||||
A similar error on 8.1/win2003 was reported on pgsql-general (sorry, I can't
|
||||
dig out the
|
||||
original post from our web archives):
|
||||
|
||||
From: Niederland
|
||||
Date: Tues, Dec 13 2005 9:49 am
|
||||
|
||||
2005-12-12 20:30:00 FATAL: semctl(50884184, 15, SETVAL, 0) failed: A
|
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non-blocking socket operation could not be completed immediately.
|
||||
|
||||
---
|
||||
|
||||
There are two problems here:
|
||||
|
||||
(1) Why a socket error?
|
||||
In port/win32.h, we have
|
||||
|
||||
#undef EAGAIN
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#undef EINTR
|
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#define EINTR WSAEINTR
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#define EAGAIN WSAEWOULDBLOCK
|
||||
|
||||
What's the rationale of doing so?
|
||||
|
||||
(2) What's happened here?
|
||||
It may come from PGSemaphoreReset(), and win32 semop() looks like this:
|
||||
|
||||
ret = WaitForMultipleObjectsEx(2, wh, FALSE, (sops[0].sem_flg &
|
||||
IPC_NOWAIT) ? 0 : INFINITE, TRUE);
|
||||
...
|
||||
else if (ret == WAIT_OBJECT_0 + 1 || ret == WAIT_IO_COMPLETION)
|
||||
{
|
||||
pgwin32_dispatch_queued_signals();
|
||||
errno = EINTR;
|
||||
}
|
||||
else if (ret == WAIT_TIMEOUT)
|
||||
errno = EAGAIN;
|
||||
|
||||
So it seems the EINTR is caused by an incoming signal, the EAGAIN is caused
|
||||
by a TIMEOUT ... any ideas?
|
||||
|
||||
Regards,
|
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Qingqing
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From pgsql-bugs-owner+M14482@postgresql.org Tue Feb 28 14:05:23 2006
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From: Bruce Momjian <pgman@candle.pha.pa.us>
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Message-ID: <200602281905.k1SJ52b19021@candle.pha.pa.us>
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Subject: Re: [BUGS] FATAL: semctl(1672698088, 12, SETVAL, 0) failed
|
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In-Reply-To: <dtglar$15tv$1@news.hub.org>
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To: Qingqing Zhou <zhouqq@cs.toronto.edu>
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Date: Tue, 28 Feb 2006 14:05:02 -0500 (EST)
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Status: OR
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Qingqing Zhou wrote:
|
||||
> I encountered an error when I fast shutdown 8.1.1 on Win2k:
|
||||
>
|
||||
> FATAL: semctl(1672698088, 12, SETVAL, 0) failed: A blocking operation
|
||||
> was interrupted by a call to WSACancelBlockingCall.
|
||||
>
|
||||
> A similar error on 8.1/win2003 was reported on pgsql-general (sorry, I can't
|
||||
> dig out the
|
||||
> original post from our web archives):
|
||||
>
|
||||
> From: Niederland
|
||||
> Date: Tues, Dec 13 2005 9:49 am
|
||||
>
|
||||
> 2005-12-12 20:30:00 FATAL: semctl(50884184, 15, SETVAL, 0) failed: A
|
||||
> non-blocking socket operation could not be completed immediately.
|
||||
>
|
||||
> ---
|
||||
>
|
||||
> There are two problems here:
|
||||
>
|
||||
> (1) Why a socket error?
|
||||
> In port/win32.h, we have
|
||||
>
|
||||
> #undef EAGAIN
|
||||
> #undef EINTR
|
||||
> #define EINTR WSAEINTR
|
||||
> #define EAGAIN WSAEWOULDBLOCK
|
||||
>
|
||||
> What's the rationale of doing so?
|
||||
|
||||
We did this so that our code could refer to EINTR/EAGAIN without
|
||||
port-specific tests.
|
||||
|
||||
> (2) What's happened here?
|
||||
> It may come from PGSemaphoreReset(), and win32 semop() looks like this:
|
||||
>
|
||||
> ret = WaitForMultipleObjectsEx(2, wh, FALSE, (sops[0].sem_flg &
|
||||
> IPC_NOWAIT) ? 0 : INFINITE, TRUE);
|
||||
> ...
|
||||
> else if (ret == WAIT_OBJECT_0 + 1 || ret == WAIT_IO_COMPLETION)
|
||||
> {
|
||||
> pgwin32_dispatch_queued_signals();
|
||||
> errno = EINTR;
|
||||
> }
|
||||
> else if (ret == WAIT_TIMEOUT)
|
||||
> errno = EAGAIN;
|
||||
>
|
||||
> So it seems the EINTR is caused by an incoming signal, the EAGAIN is caused
|
||||
> by a TIMEOUT ... any ideas?
|
||||
|
||||
I looked at the documentation for the function:
|
||||
|
||||
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/base/waitformultipleobjectsex.asp
|
||||
|
||||
and it isn't clear what return failure values it has. We certainly
|
||||
could loop on WSAEINTR. Can you test it?
|
||||
|
||||
--
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Bruce Momjian http://candle.pha.pa.us
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SRA OSS, Inc. http://www.sraoss.com
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+ If your life is a hard drive, Christ can be your backup. +
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From pgsql-bugs-owner+M14483@postgresql.org Tue Feb 28 21:12:39 2006
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id 6A8CA30BA5; Wed, 1 Mar 2006 03:12:19 +0100 (MET)
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From: "Qingqing Zhou" <zhouqq@cs.toronto.edu>
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X-Newsgroups: pgsql.bugs
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Subject: Re: [BUGS] FATAL: semctl(1672698088, 12, SETVAL, 0) failed
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Date: Wed, 1 Mar 2006 10:08:58 +0800
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Status: ORr
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"Bruce Momjian" <pgman@candle.pha.pa.us> wrote
|
||||
> > In port/win32.h, we have
|
||||
> >
|
||||
> > #undef EAGAIN
|
||||
> > #undef EINTR
|
||||
> > #define EINTR WSAEINTR
|
||||
> > #define EAGAIN WSAEWOULDBLOCK
|
||||
> >
|
||||
> > What's the rationale of doing so?
|
||||
>
|
||||
> We did this so that our code could refer to EINTR/EAGAIN without
|
||||
> port-specific tests.
|
||||
>
|
||||
|
||||
AFAICS, by doing so, the EINTR/EAGAIN will be translated into
|
||||
WSAINTR/WSAEWOULDBLOCK through *all* the backend code. That's seems not
|
||||
appropriate for the code not involving any socket stuff ... I think we need
|
||||
a fix here.
|
||||
|
||||
> > (2) What's happened here?
|
||||
> > It may come from PGSemaphoreReset(), and win32 semop() looks like this:
|
||||
> >
|
||||
> > ret = WaitForMultipleObjectsEx(2, wh, FALSE, (sops[0].sem_flg &
|
||||
> > IPC_NOWAIT) ? 0 : INFINITE, TRUE);
|
||||
> > ...
|
||||
> > else if (ret == WAIT_OBJECT_0 + 1 || ret == WAIT_IO_COMPLETION)
|
||||
> > {
|
||||
> > pgwin32_dispatch_queued_signals();
|
||||
> > errno = EINTR;
|
||||
> > }
|
||||
> > else if (ret == WAIT_TIMEOUT)
|
||||
> > errno = EAGAIN;
|
||||
> >
|
||||
> > So it seems the EINTR is caused by an incoming signal, the EAGAIN is
|
||||
caused
|
||||
> > by a TIMEOUT ... any ideas?
|
||||
>
|
||||
> I looked at the documentation for the function:
|
||||
>
|
||||
>
|
||||
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/base/waitformultipleobjectsex.asp
|
||||
>
|
||||
> and it isn't clear what return failure values it has. We certainly
|
||||
> could loop on WSAEINTR. Can you test it?
|
||||
>
|
||||
|
||||
Yeah, looking at other code of using semop(), we could plug in a loop in the
|
||||
win32 semctl():
|
||||
|
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/* Quickly lock/unlock the semaphore (if we can) */
|
||||
+ do
|
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+ {
|
||||
+ errStatus = semop(semId, &sops, 1);
|
||||
+ } while (errStatus < 0 && errno == EINTR);
|
||||
|
||||
if (semop(semId, &sops, 1) < 0)
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||||
return -1;
|
||||
|
||||
But:
|
||||
(1) The EINTR problem happens rather rare, so testing it is difficult;
|
||||
(2) I would rather not doing the above changes before we understand what's
|
||||
happened here, especially when we have seen a EAGAIN reported here.
|
||||
|
||||
Regards,
|
||||
Qingqing
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Tue, 28 Feb 2006 22:08:37 -0500 (EST)
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From: Bruce Momjian <pgman@candle.pha.pa.us>
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Message-ID: <200603010308.k2138bO09022@candle.pha.pa.us>
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Subject: Re: [BUGS] FATAL: semctl(1672698088, 12, SETVAL, 0) failed
|
||||
In-Reply-To: <du2vtq$eu3$1@news.hub.org>
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To: Qingqing Zhou <zhouqq@cs.toronto.edu>
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Date: Tue, 28 Feb 2006 22:08:37 -0500 (EST)
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Status: OR
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Qingqing Zhou wrote:
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||||
>
|
||||
> "Bruce Momjian" <pgman@candle.pha.pa.us> wrote
|
||||
> > > In port/win32.h, we have
|
||||
> > >
|
||||
> > > #undef EAGAIN
|
||||
> > > #undef EINTR
|
||||
> > > #define EINTR WSAEINTR
|
||||
> > > #define EAGAIN WSAEWOULDBLOCK
|
||||
> > >
|
||||
> > > What's the rationale of doing so?
|
||||
> >
|
||||
> > We did this so that our code could refer to EINTR/EAGAIN without
|
||||
> > port-specific tests.
|
||||
> >
|
||||
>
|
||||
> AFAICS, by doing so, the EINTR/EAGAIN will be translated into
|
||||
> WSAINTR/WSAEWOULDBLOCK through *all* the backend code. That's seems not
|
||||
> appropriate for the code not involving any socket stuff ... I think we need
|
||||
> a fix here.
|
||||
|
||||
Uh, how do we handle it now? I thought we did just that.
|
||||
|
||||
> http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/base/waitformultipleobjectsex.asp
|
||||
> >
|
||||
> > and it isn't clear what return failure values it has. We certainly
|
||||
> > could loop on WSAEINTR. Can you test it?
|
||||
> >
|
||||
>
|
||||
> Yeah, looking at other code of using semop(), we could plug in a loop in the
|
||||
> win32 semctl():
|
||||
>
|
||||
> /* Quickly lock/unlock the semaphore (if we can) */
|
||||
> + do
|
||||
> + {
|
||||
> + errStatus = semop(semId, &sops, 1);
|
||||
> + } while (errStatus < 0 && errno == EINTR);
|
||||
>
|
||||
> if (semop(semId, &sops, 1) < 0)
|
||||
> return -1;
|
||||
>
|
||||
> But:
|
||||
> (1) The EINTR problem happens rather rare, so testing it is difficult;
|
||||
> (2) I would rather not doing the above changes before we understand what's
|
||||
> happened here, especially when we have seen a EAGAIN reported here.
|
||||
|
||||
OK, so how do we find the answer?
|
||||
|
||||
--
|
||||
Bruce Momjian http://candle.pha.pa.us
|
||||
SRA OSS, Inc. http://www.sraoss.com
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|
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+ If your life is a hard drive, Christ can be your backup. +
|
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|
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---------------------------(end of broadcast)---------------------------
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TIP 2: Don't 'kill -9' the postmaster
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From pgsql-bugs-owner+M14486@postgresql.org Tue Feb 28 22:21:21 2006
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Subject: Re: [BUGS] FATAL: semctl(1672698088, 12, SETVAL, 0) failed
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On Tue, 28 Feb 2006, Bruce Momjian wrote:
|
||||
|
||||
>
|
||||
> Uh, how do we handle it now? I thought we did just that.
|
||||
>
|
||||
> OK, so how do we find the answer?
|
||||
>
|
||||
|
||||
For both problems, I am uncertain (or I've sent a patch already :-(). Call
|
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more artillery support here ...
|
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|
||||
Regards,
|
||||
Qingqing
|
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TIP 5: don't forget to increase your free space map settings
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