Date: Fri, 26 Feb 2010 13:23:36 +0200 From: Kostik Belousov <kostikbel@gmail.com> To: Peter Steele <psteele@maxiscale.com> Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, freebsd-python@freebsd.org Subject: Re: ntpd hangs under FBSD 8 Message-ID: <20100226112336.GF2489@deviant.kiev.zoral.com.ua> In-Reply-To: <7B9397B189EB6E46A5EE7B4C8A4BB7CB39E95991@MBX03.exg5.exghost.com> References: <7B9397B189EB6E46A5EE7B4C8A4BB7CB39E95389@MBX03.exg5.exghost.com> <20100224190035.GA5026@wep4035.physik.uni-wuerzburg.de> <7B9397B189EB6E46A5EE7B4C8A4BB7CB39E95522@MBX03.exg5.exghost.com> <20100225125838.13cd6c0e.ray@dlink.ua> <7B9397B189EB6E46A5EE7B4C8A4BB7CB39E95689@MBX03.exg5.exghost.com> <20100225151828.GA2489@deviant.kiev.zoral.com.ua> <7B9397B189EB6E46A5EE7B4C8A4BB7CB39E95703@MBX03.exg5.exghost.com> <20100225164514.GB2489@deviant.kiev.zoral.com.ua> <7B9397B189EB6E46A5EE7B4C8A4BB7CB39E95765@MBX03.exg5.exghost.com> <7B9397B189EB6E46A5EE7B4C8A4BB7CB39E95991@MBX03.exg5.exghost.com>
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On Thu, Feb 25, 2010 at 04:26:22PM -0600, Peter Steele wrote:
> > We'll likely go with this solution instead of downgrading Python and the related libraries.
>
> In fact I came up with another solution. I realized that since the problem was related to the process signal mask, instead of called ntpd directly, wrap it up in a C app that resets the signal mask to something that works. I have the following code:
>
> sigset_t set, oset;
> sigemptyset(&set);
> pthread_sigmask(SIG_SETMASK, &set, &oset);
> system("/usr/sbin/ntpd -g -q");
> pthread_sigmask(SIG_SETMASK, &oset, NULL);
>
> I wrapped this up into a standalone app and call this from Python instead of calling ntpd directly. This solved the problem--no more hang. Thanks very much to Kostik Belousov for his "wild guess" that this was related to the process signal mask. His guess was dead on.
So this is arguably a Python bug. Did you contacted anybody who
cares about the Python ?
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