Re: same pid ?

>On Fri, Feb 11, 2011 at 4:56 AM, Jonathan Isom <[email protected]> wrote:
> Newer distros use Native POSIX Thread Library (NPTL).  They return the same pid.
>
>

if linux treats every thing as task (both thread and process ) and
CLONE_PID flag is obsolete, i expected unique pid.

-ratheesh



On Fri, Feb 11, 2011 at 4:56 AM, Jonathan Isom <[email protected]> wrote:
> On Thu, Feb 10, 2011 at 12:09 PM, ratheesh k <[email protected]> wrote:
>> 2011/2/10 Michal Nazarewicz <[email protected]>:
>>> On Thu, 10 Feb 2011 12:37:25 +0100, ratheesh k <[email protected]>
>>> wrote:
>>>>
>>>> i created two threads with pthread library. But both threads returns
>>>> same pid with getpid() function. ???
>>>
>>> PID is a Process ID.  All threads in given process have the same PID.
>>>
>>
>> pthread uses clone system call. doen't it ? if so, please see - man clone
>>
>>
>>  CLONE_PID (obsolete)
>>             If  CLONE_PID is set, the child process is created with the same
>>             process ID as the calling process.  This is good for hacking the
>>             system,  but  otherwise of not much use.  Since 2.3.21 this flag
>>             can be specified only by the system boot process  (PID  0).   It
>>             disappeared in Linux 2.5.16.
>>
>>
>
> Newer distros use Native POSIX Thread Library (NPTL).  They return the same pid.
>
>
>>
>>
>>
>>
>>
>>> --
>>> Best regards,                                       _     _
>>> .o. | Liege of Serenly Enlightened Majesty of     o' \,=./ `o
>>> ..o | Computer Science,  Michal "mina86" Nazarewicz  (o o)
>>> ooo +-<email/jid: [email protected]>--------ooO--(_)--Ooo--
>>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
>> the body of a message to [email protected]
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>
>
>
>
> --
> ASUS M4A78 PRO motherboard
> Athlon II X4 640 Processor
> 4 Gigabytes of DDR2-800
> Galaxy GTX 465 Graphics adapter
> KWorld ATSC 110 TV Capture Card
> KWorld ATSC 115 TV Capture Card
>
--
To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html