nptl/sem_init.c

   1 /* Copyright (C) 2002, 2007 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   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
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <semaphore.h>
  22 #include <lowlevellock.h>
  23 #include <shlib-compat.h>
  24 #include "semaphoreP.h"
  25 #include <kernel-features.h>
  26
  27
  28 int
  29 __new_sem_init (sem, pshared, value)
  30      sem_t *sem;
  31      int pshared;
  32      unsigned int value;
  33 {
  34   /* Parameter sanity check.  */
  35   if (__builtin_expect (value > SEM_VALUE_MAX, 0))
  36     {
  37       __set_errno (EINVAL);
  38       return -1;
  39     }
  40
  41   /* Map to the internal type.  */
  42   struct new_sem *isem = (struct new_sem *) sem;
  43
  44   /* Use the values the user provided.  */
  45   isem->value = value;
  46 #ifdef __ASSUME_PRIVATE_FUTEX
  47   isem->private = pshared ? 0 : FUTEX_PRIVATE_FLAG;
  48 #else
  49   isem->private = pshared ? 0 : THREAD_GETMEM (THREAD_SELF,
  50                                                header.private_futex);
  51 #endif
  52
  53   isem->nwaiters = 0;
  54
  55   return 0;
  56 }
  57 versioned_symbol (libpthread, __new_sem_init, sem_init, GLIBC_2_1);
  58
  59
  60
  61 #if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1)
  62 int
  63 attribute_compat_text_section
  64 __old_sem_init (sem, pshared, value)
  65      sem_t *sem;
  66      int pshared;
  67      unsigned int value;
  68 {
  69   /* Parameter sanity check.  */
  70   if (__builtin_expect (value > SEM_VALUE_MAX, 0))
  71     {
  72       __set_errno (EINVAL);
  73       return -1;
  74     }
  75
  76   /* Map to the internal type.  */
  77   struct old_sem *isem = (struct old_sem *) sem;
  78
  79   /* Use the value the user provided.  */
  80   isem->value = value;
  81
  82   /* We cannot store the PSHARED attribute.  So we always use the
  83      operations needed for shared semaphores.  */
  84
  85   return 0;
  86 }
  87 compat_symbol (libpthread, __old_sem_init, sem_init, GLIBC_2_0);
  88 #endif