linux-kernel - Re: Which function returns LWP in Linux.

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Message-ID: <AANLkTik2OcSBGdkRQKFl6xh06PEr7Al6xaUsmMGGC6jo@mail.gmail.com>
Date:	Mon, 17 May 2010 13:03:14 +0530
From:	Jaswinder Singh Rajput <jaswinderlinux@...il.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Srinivas Nayak <sinu.nayak2001@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Which function returns LWP in Linux.

Hello KOSAKI-san,

On Mon, May 17, 2010 at 12:33 PM, KOSAKI Motohiro
<kosaki.motohiro@...fujitsu.com> wrote:
>> Hi,
>>
>> For a process, we have different PIDs. For threads under a single
>> processes, we have different LWP id, but same PID in Linux.
>> ex.
>>
>> root@pc:/home/srinivas# ps -eLf
>> UID        PID  PPID     LWP  C STIME       TIME     CMD
>> root       100     1     100  0 May13       00:00:02 ./a.out
>> root       100     1     102  0 May13       00:00:00 ./a.out
>>
>> getpid() function returns PID of a process.
>> Which function retuns LWP id for thread?
>
> gettid()
>

gettid() is linux specific and not supported in glibc. Normally
application do not use gettid(), even procps is not using it, that why
I suggested Srinivas to check procps source to find the best solution
for it.

Thanks,
--
Jaswinder Singh.
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