Re: [Boost-users] [IPC Named Mutex]

Subject: Re: [Boost-users] [IPC Named Mutex]
From: Michael (mwpowellhtx_at_[hidden])
Date: 2015-05-28 15:02:20

On May 28, 2015 2:50:48 PM EDT, "Ion Gaztañaga" <igaztanaga_at_[hidden]> wrote:
>El 28/05/2015 a las 12:13, Niall Douglas escribió:
>> On 27 May 2015 at 18:00, Ion Gaztañaga wrote:
>>
>>>> Given that the failure was somewhere related to directory names,
>what's
>>>> probably happening is that it's trying to find the name of its
>shared
>>>> directory.  For that it evidently wants to use the boot time, as
>it's a
>>>> value that should be identical for all processes started since the
>last
>>>> reboot, but different between reboots (to avoid getting stale
>data).
>>>
>>> Yes, that's the idea. Obtaining this "unique" identifier between
>reboots
>>> that remains stable between all processes it's been incredibly
>>> difficult. Any alternative or suggestion is welcome.
>>
>> On Windows you can mark a filing system entry as always deleted on
>> close. Such an entry will be deleted on close no matter what,
>> including power loss and filesystem corruption (the chkdsk with
>> delete such still existing items).
>>
>> If you therefore need a synchronisation object to exist only for this
>> boot cycle and to always disappear in the next boot cycle, delete on
>> close is an excellent way of doing it. Why the Windows Temp files
>> don't default to delete on close is beyond me (you can also unset
>> delete on close at any time on an open file handle).
>
>Can you elaborate, please? What's a "filling system entry"?
>
>Delete-on-close would delete the resource when the last attached
>process 
>exits, so it would be deleted before system reboot a new processes
>could 
>not connect to the resource. Or am I missing something?

Wouldn't it be a moot point when all mutex consumers closed? Next one fires up and requests a brand new round of shared mutex.

>Thanks
>
>Ion
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