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Re: New bug: flock not implemented -> sem fails


From: Ole Tange
Subject: Re: New bug: flock not implemented -> sem fails
Date: Tue, 15 Nov 2011 01:47:30 +0100

On Tue, Nov 15, 2011 at 1:25 AM,  <address@hidden> wrote:
> On Tue, 15 Nov 2011 00:47:35 +0100
> Ole Tange <address@hidden> wrote:
>
>> On Mon, Nov 14, 2011 at 6:48 PM,  <address@hidden> wrote:
>>
>> > I have emailed the admin on that system, and apparently they
>> > normally do have flock enabled, but after their latest reboot that
>> > flag was not set for some reason.  They'll fix that manually.
>> >
>> > I'll see what would work for a flock replacement, but I may not be
>> > able to do it (time pressure).  In the meantime, could parallel be
>> > modified to not enter an infinite loop when flock returns ENOSYS?
>>
>> As you are the only one I know of who has this problem, it is probably
>> easier for you to change and test the code. It is in the while loop
>> around line 4900 where you should test if the return value is ENOSYS,
>> print a warning and leave the while loop.
>
> See attached patch 'parallel-20110802.enosys.patch'.

Thanks.

>> > Also, if you make each of the html files depend on a previous html
>> > file, then 'make -j' will serialize them and the pod2html problem
>> > goes away. This unfortunately means that someone who just wants to
>> > build one html file may get more than they want, but that's a
>> > smaller group than the group of people who type 'make -j'
>> > indiscriminately. :-)
>>
>> The actual program 'parallel' is a single, very portable perl script.
>> You should be able to copy that to any UNIX-like machine and it will
>> run. So you should have no problem installing GNU Parallel on another
>> machine and simply copy the 'parallel' program to the target machine.
>
> See attached patch 'parallel-20110802.pod2html.patch'.

Thanks.

Both are implemented in adapted versions in current git version.

/Ole



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