/* sem_post -- post to a POSIX semaphore.  Generic futex-using version.   Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc.   This file is part of the GNU C Library.   Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.   The GNU C Library is free software; you can redistribute it and/or   modify it under the terms of the GNU Lesser General Public   License as published by the Free Software Foundation; either   version 2.1 of the License, or (at your option) any later version.   The GNU C Library 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   Lesser General Public License for more details.   You should have received a copy of the GNU Lesser General Public   License along with the GNU C Library; if not, write to the Free   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA   02111-1307 USA.  */#include <errno.h>#include <sysdep.h>#include <lowlevellock.h>#include <internaltypes.h>#include <semaphore.h>#include <shlib-compat.h>int__new_sem_post (sem_t *sem){  struct new_sem *isem = (struct new_sem *) sem;  int nr = atomic_increment_val (&isem->value);  atomic_full_barrier ();  if (isem->nwaiters > 0)    {      int err = lll_futex_wake (&isem->value, 1,				isem->private ^ FUTEX_PRIVATE_FLAG);      if (__builtin_expect (err, 0) < 0)	{	  __set_errno (-err);	  return -1;	}    }  return 0;}versioned_symbol (libpthread, __new_sem_post, sem_post, GLIBC_2_1);#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1)intattribute_compat_text_section__old_sem_post (sem_t *sem){  int *futex = (int *) sem;  int nr = atomic_increment_val (futex);  /* We always have to assume it is a shared semaphore.  */  int err = lll_futex_wake (futex, 1, LLL_SHARED);  if (__builtin_expect (err, 0) < 0)    {      __set_errno (-err);      return -1;    }  return 0;}compat_symbol (libpthread, __old_sem_post, sem_post, GLIBC_2_0);#endif