/* Copyright (C) 2003, 2004, 2006, 2007 Free Software Foundation, Inc.   This file is part of the GNU C Library.   Contributed by Martin Schwidefsky <schwidefsky@de.ibm.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 <pthreadP.h>/* Wait on barrier.  */intpthread_barrier_wait (barrier)     pthread_barrier_t *barrier;{  union sparc_pthread_barrier *ibarrier    = (union sparc_pthread_barrier *) barrier;  int result = 0;  int private = ibarrier->s.pshared ? LLL_SHARED : LLL_PRIVATE;  /* Make sure we are alone.  */  lll_lock (ibarrier->b.lock, private);  /* One more arrival.  */  --ibarrier->b.left;  /* Are these all?  */  if (ibarrier->b.left == 0)    {      /* Yes. Increment the event counter to avoid invalid wake-ups and	 tell the current waiters that it is their turn.  */      ++ibarrier->b.curr_event;      /* Wake up everybody.  */      lll_futex_wake (&ibarrier->b.curr_event, INT_MAX, private);      /* This is the thread which finished the serialization.  */      result = PTHREAD_BARRIER_SERIAL_THREAD;    }  else    {      /* The number of the event we are waiting for.  The barrier's event	 number must be bumped before we continue.  */      unsigned int event = ibarrier->b.curr_event;      /* Before suspending, make the barrier available to others.  */      lll_unlock (ibarrier->b.lock, private);      /* Wait for the event counter of the barrier to change.  */      do	lll_futex_wait (&ibarrier->b.curr_event, event, private);      while (event == ibarrier->b.curr_event);    }  /* Make sure the init_count is stored locally or in a register.  */  unsigned int init_count = ibarrier->b.init_count;  /* If this was the last woken thread, unlock.  */  if (__atomic_is_v9 || ibarrier->s.pshared == 0)    {      if (atomic_increment_val (&ibarrier->b.left) == init_count)	/* We are done.  */	lll_unlock (ibarrier->b.lock, private);    }  else    {      unsigned int left;      /* Slightly more complicated.  On pre-v9 CPUs, atomic_increment_val	 is only atomic for threads within the same process, not for	 multiple processes.  */      __sparc32_atomic_do_lock24 (&ibarrier->s.left_lock);      left = ++ibarrier->b.left;      __sparc32_atomic_do_unlock24 (&ibarrier->s.left_lock);      if (left == init_count)        /* We are done.  */	lll_unlock (ibarrier->b.lock, private);    }  return result;}