Date: Thu, 03 Jun 2010 21:15:17 +0200 From: =?UTF-8?B?VsOhY2xhdiBIYWlzbWFu?= <v.haisman@sh.cvut.cz> To: freebsd-hackers@freebsd.org Subject: Re: How to get a thread ID? Message-ID: <4C07FF45.5070703@sh.cvut.cz> In-Reply-To: <Pine.GSO.4.64.1006031045330.28157@sea.ntplx.net> References: <6e716c850fa84621482b71826dae55d5@shell.sh.cvut.cz> <Pine.GSO.4.64.1006031045330.28157@sea.ntplx.net>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig314A951EB8F701BE6C665A06 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Daniel Eischen wrote, On 3.6.2010 16:51: > On Thu, 3 Jun 2010, V=C3=A1clav Haisman wrote: >=20 >> >> Hi, >> is it possible to obtain some sort of a thread ID that identifies a th= read >> within a process other than pthread_self()? Something like gettid() on= >> Linux? Apparently, on FreeBSD the pthread_t is a pointer type and does= not >> identify the thread well enough. GDB on FreeBSD seems to know about th= reads >> and does not seem to use the same ID as is pthread_t. >=20 > "identifies a thread" well enough for what? pthread_t is suppose > to be opaque. Whether it is an int, pointer, or whatever, it is > implementation-defined and not suppose provide any more information > than available through the standard pthread interfaces. There are > some non-portable interfaces in <pthread_np.h> though. Exactly, pthread_t is opaque and it thus it is only by a chance that I ca= n print its value, it is a pointer on FreeBSD. It could as well be a struct= and then I could not possibly do anything to print the thread identity on scr= een. * 4 Thread 28426ec0 (LWP 100172) 0x0804b9f6 in TestThread::run () As shown above, GDB can show some sort of ID, the LWP bit. How does it ge= t it? Is it possible to get the LWP ID from inside the process without debugging it? --------------enig314A951EB8F701BE6C665A06 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEAREIAAYFAkwH/0wACgkQr2CghdezFMnIPACg3HRywOn0bVrX/U7RcXOBP7A8 dfYAn1L0ytWSeyeuuQiqW9x6QEOssOQM =HBhB -----END PGP SIGNATURE----- --------------enig314A951EB8F701BE6C665A06--
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