nptl/sysdeps/unix/sysv/linux/x86_64/timer_create.c

   1 /* Copyright (C) 2003 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <shlib-compat.h>
  21 #include "compat-timer.h"
  22 #include <atomic.h>
  23
  24
  25 #define timer_create_alias __timer_create_new
  26 #include "../timer_create.c"
  27
  28 #undef timer_create
  29 versioned_symbol (librt, __timer_create_new, timer_create, GLIBC_2_3_3);
  30
  31
  32 #if SHLIB_COMPAT (librt, GLIBC_2_2, GLIBC_2_3_3)
  33 timer_t __compat_timer_list[OLD_TIMER_MAX] attribute_hidden;
  34
  35
  36 int
  37 __timer_create_old (clockid_t clock_id, struct sigevent *evp, int *timerid)
  38 {
  39   timer_t newp;
  40
  41   int res = __timer_create_new (clock_id, evp, &newp);
  42   if (res == 0)
  43     {
  44       int i;
  45       for (i = 0; i < OLD_TIMER_MAX; ++i)
  46         if (__compat_timer_list[i] == NULL
  47             && ! atomic_compare_and_exchange_bool_acq (&__compat_timer_list[i],
  48                                                        newp, NULL))
  49           {
  50             *timerid = i;
  51             break;
  52           }
  53
  54       if (__builtin_expect (i == OLD_TIMER_MAX, 0))
  55         {
  56           /* No free slot.  */
  57           (void) __timer_delete_new (newp);
  58           __set_errno (EINVAL);
  59           res = -1;
  60         }
  61     }
  62
  63   return res;
  64 }
  65 compat_symbol (librt, __timer_create_old, timer_create, GLIBC_2_2);
  66 #endif