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

   1 /* Copyright (C) 2003-2014 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
  17    not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include <shlib-compat.h>
  20 #include "compat-timer.h"
  21 #include <atomic.h>
  22
  23
  24 #define timer_create_alias __timer_create_new
  25 #include "../timer_create.c"
  26
  27 #undef timer_create
  28 versioned_symbol (librt, __timer_create_new, timer_create, GLIBC_2_3_3);
  29
  30
  31 #if SHLIB_COMPAT (librt, GLIBC_2_2, GLIBC_2_3_3)
  32 timer_t __compat_timer_list[OLD_TIMER_MAX] attribute_hidden;
  33
  34
  35 int
  36 __timer_create_old (clockid_t clock_id, struct sigevent *evp, int *timerid)
  37 {
  38   timer_t newp;
  39
  40   int res = __timer_create_new (clock_id, evp, &newp);
  41   if (res == 0)
  42     {
  43       int i;
  44       for (i = 0; i < OLD_TIMER_MAX; ++i)
  45         if (__compat_timer_list[i] == NULL
  46             && ! atomic_compare_and_exchange_bool_acq (&__compat_timer_list[i],
  47                                                        newp, NULL))
  48           {
  49             *timerid = i;
  50             break;
  51           }
  52
  53       if (__builtin_expect (i == OLD_TIMER_MAX, 0))
  54         {
  55           /* No free slot.  */
  56           (void) __timer_delete_new (newp);
  57           __set_errno (EINVAL);
  58           res = -1;
  59         }
  60     }
  61
  62   return res;
  63 }
  64 compat_symbol (librt, __timer_create_old, timer_create, GLIBC_2_2);
  65 #endif