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glibc  2.9
timer_create.c
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00001 /* Copyright (C) 2003 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public License as
00007    published by the Free Software Foundation; either version 2.1 of the
00008    License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; see the file COPYING.LIB.  If not,
00017    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00018    Boston, MA 02111-1307, USA.  */
00019 
00020 #include <shlib-compat.h>
00021 #include "compat-timer.h"
00022 #include <atomic.h>
00023 
00024 
00025 #define timer_create_alias __timer_create_new
00026 #include "../timer_create.c"
00027 
00028 #undef timer_create
00029 versioned_symbol (librt, __timer_create_new, timer_create, GLIBC_2_3_3);
00030 
00031 
00032 #if SHLIB_COMPAT (librt, GLIBC_2_2, GLIBC_2_3_3)
00033 timer_t __compat_timer_list[OLD_TIMER_MAX] attribute_hidden;
00034 
00035 
00036 int
00037 __timer_create_old (clockid_t clock_id, struct sigevent *evp, int *timerid)
00038 {
00039   timer_t newp;
00040 
00041   int res = __timer_create_new (clock_id, evp, &newp);
00042   if (res == 0)
00043     {
00044       int i;
00045       for (i = 0; i < OLD_TIMER_MAX; ++i)
00046        if (__compat_timer_list[i] == NULL
00047            && ! atomic_compare_and_exchange_bool_acq (&__compat_timer_list[i],
00048                                                  newp, NULL))
00049          {
00050            *timerid = i;
00051            break;
00052          }
00053 
00054       if (__builtin_expect (i == OLD_TIMER_MAX, 0))
00055        {
00056          /* No free slot.  */
00057          (void) __timer_delete_new (newp);
00058          __set_errno (EINVAL);
00059          res = -1;
00060        }
00061     }
00062 
00063   return res;
00064 }
00065 compat_symbol (librt, __timer_create_old, timer_create, GLIBC_2_2);
00066 #endif