Re: same pid ?

ratheesh k <[email protected]> Thu, 10 Feb 2011 23:39:01 +0530

Newsgroups	org.kernel.vger.linux-c-programming
Message-ID	<[email protected]>

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.








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