1 /* Setup of nscd worker threads. Linux verison.
2 Copyright (C) 2004 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@redhat.com>, 2004.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
28 setup_thread (struct database_dyn
*db
)
30 #ifdef __NR_set_tid_address
31 /* Only supported when NPTL is used. */
33 if (confstr (_CS_GNU_LIBPTHREAD_VERSION
, buf
, sizeof (buf
)) >= sizeof (buf
)
34 || strncmp (buf
, "NPTL", 4) != 0)
37 /* Do not try this at home, kids. We play with the SETTID address
38 even thought the process is multi-threaded. This can only work
39 since none of the threads ever terminates. */
40 INTERNAL_SYSCALL_DECL (err
);
41 int r
= INTERNAL_SYSCALL (set_tid_address
, err
, 1,
42 &db
->head
->nscd_certainly_running
);
43 if (!INTERNAL_SYSCALL_ERROR_P (r
, err
))
44 /* We know the kernel can reset this field when nscd terminates.
45 So, set the field to a nonzero value which indicates that nscd
46 is certainly running and clients can skip the test. */
47 db
->head
->nscd_certainly_running
= 1;