Intermittent failures retrieving process exit codes
Denis Excoffier
cygwin@Denis-Excoffier.org
Fri Nov 15 18:53:00 GMT 2013
On 2013-11-14 05:01, Tom Honermann wrote:
> On 12/21/2012 01:30 AM, Tom Honermann wrote:
>>
>> The workaround I implemented within Cygwin was simple and sloppy. I
>> added a call to Sleep(1000) immediately before the call to ExitThread()
>> in wait_sig() in winsup/cygwin/sigproc.cc. Since this thread (probably)
>> doesn't exit until the process is exiting anyway, the call to Sleep()
>> does not adversely affect shutdown. The thread just gets terminated
>> while in the call to Sleep() instead of exiting before the process is
>> terminated or getting terminated while still in the call to
>> ExitThread(). A better solution might be to avoid the thread exiting at
>> all (so long as it can't get terminated while holding critical
>> resources), or to have the process exiting thread wait on it. Neither
>> of these is ideal. Orderly shutdown of multi-threaded processes is
>> really hard to do correctly on Windows.
I experience on Windows 7 (not on XP) some problems that may be related.
I would like to test your workaround, but sigproc.cc has much changed since
then, there is now an exit_thead function with the comment "Exit the current
thread very carefully.". I tried to insert Sleep(1000) at the end of
exit_thread, immediately before "ExitThread (0)", but this yielded no
change at all.
Could someone be kind enough to update the workaround for modern sigproc.cc?
Very briefly, my problem is that when i "tar xf —use-compress-program=xz", i
get:
tar: Unexpected EOF in archive
tar: Unexpected EOF in archive
tar: Error is not recoverable: exiting now
and the last file of the archive is truncated at some 512bytes block. This
occurs on Windows 7 (not on XP); with xz-5.1.3alpha (not with xz-5.1.2alpha or
xz-5.0.5); never on most tar.xz files; almost always on some (rare) tar.xz files
(one notable example is bc-1.06.95.tar.bz2 bunzip2’ed and then xz’ed); depends
on the .tar file itself, not on the option (like -9e, -0) used to create the
.tar.xz; never with "tar tf"; and with all tar’s i have tested. The return code
of all the involved xz -d commands is always zero though. Perhaps after all, this
is unrelated?
Thank you.
Regards,
Denis Excoffier.
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