Re: singleton for script with shebang

[Ole Tange]

On Fri, Jan 2, 2015 at 8:53 PM, Bradley Asztalos <brad@customweather.com> wrote:
> On Fri, Jan 2, 2015 at 7:35 AM, Ole Tange <ole@tange.dk> wrote:
>> On Fri, Jan 2, 2015 at 10:51 AM, Bradley Asztalos
>> <brad@customweather.com> wrote:
:
>> So that is almost the opposite of --semaphoretimeout
>>
>> Maybe it should be able to take a negative value: If you cannot get
>> the semaphore within 2 seconds, give up.
>>
>> sem --semaphoretimeout -2 do_stuff

> That would work.
>
> Does --semaphoretimeout 0 mean never give up?

Yes: Just as if the option had not been given.

> If so then -0 could mean give up immediately.

-0 = 0, so no.

It is implemented in the git version.

> By the way the note on the sem man page says that sem --timeout is not
> implemented.

I have updated the man page.

--timeout is for timing out the running of the command.

--semaphoretimeout is for timing out on getting the semaphore.


/Ole