Re: same pid ?

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On Thu, Feb 10, 2011 at 12:09 PM, ratheesh k <ratheesh.ksz@xxxxxxxxx> wrote:
> 2011/2/10 Michal Nazarewicz <mina86@xxxxxxxxxx>:
>> On Thu, 10 Feb 2011 12:37:25 +0100, ratheesh k <ratheesh.ksz@xxxxxxxxx>
>> 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: mnazarewicz@xxxxxxxxxx>--------ooO--(_)--Ooo--
>>
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