nscd_setup_thread.c

glibc 库, 不仅可以学习使用库函数,还可以学习函数的具体实现,是提高功力的好资料

/* Setup of nscd worker threads.  Linux verison.
   Copyright (C) 2004, 2005 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <[e-mail]>, 2004.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 2 as
   published by the Free Software Foundation.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include <string.h>
#include <unistd.h>
#include <nscd.h>
#include <sysdep.h>


void
setup_thread (struct database_dyn *db)
{
#ifdef __NR_set_tid_address
  /* Only supported when NPTL is used.  */
  char buf[100];
  if (confstr (_CS_GNU_LIBPTHREAD_VERSION, buf, sizeof (buf)) >= sizeof (buf)
      || strncmp (buf, "NPTL", 4) != 0)
    return;

  /* Do not try this at home, kids.  We play with the SETTID address
     even thought the process is multi-threaded.  This can only work
     since none of the threads ever terminates.  */
  INTERNAL_SYSCALL_DECL (err);
  int r = INTERNAL_SYSCALL (set_tid_address, err, 1,
			    &db->head->nscd_certainly_running);
  if (!INTERNAL_SYSCALL_ERROR_P (r, err))
    /* We know the kernel can reset this field when nscd terminates.
       So, set the field to a nonzero value which indicates that nscd
       is certainly running and clients can skip the test.  */
    db->head->nscd_certainly_running = 1;
#endif
}