/* Copyright (C) 2006, 2007 Free Software Foundation, Inc.   This file is part of the GNU C Library.   Contributed by Jakub Jelinek <jakub@redhat.com>, 2006.   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 <sys/time.h>#include <pthreadP.h>int__lll_robust_lock_wait (int *futex, int private){  int oldval = *futex;  int tid = THREAD_GETMEM (THREAD_SELF, tid);  /* If the futex changed meanwhile try locking again.  */  if (oldval == 0)    goto try;  do    {      if (__builtin_expect (oldval & FUTEX_OWNER_DIED, 0))	return oldval;      int newval = oldval | FUTEX_WAITERS;      if (oldval != newval	  && atomic_compare_and_exchange_bool_acq (futex, newval, oldval))	continue;      lll_futex_wait (futex, newval, private);    try:      ;    }  while ((oldval = atomic_compare_and_exchange_val_acq (futex,							tid | FUTEX_WAITERS,							0)) != 0);  return 0;}int__lll_robust_timedlock_wait (int *futex, const struct timespec *abstime,			     int private){  /* Reject invalid timeouts.  */  if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)    return EINVAL;  int tid = THREAD_GETMEM (THREAD_SELF, tid);  int oldval = *futex;  /* If the futex changed meanwhile try locking again.  */  if (oldval == 0)    goto try;  do    {      struct timeval tv;      struct timespec rt;      /* Get the current time.  */      (void) __gettimeofday (&tv, NULL);      /* Compute relative timeout.  */      rt.tv_sec = abstime->tv_sec - tv.tv_sec;      rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000;      if (rt.tv_nsec < 0)	{	  rt.tv_nsec += 1000000000;	  --rt.tv_sec;	}      /* Already timed out?  */      if (rt.tv_sec < 0)	return ETIMEDOUT;      /* Wait.  */      if (__builtin_expect (oldval & FUTEX_OWNER_DIED, 0))	return oldval;      int newval = oldval | FUTEX_WAITERS;      if (oldval != newval	  && atomic_compare_and_exchange_bool_acq (futex, newval, oldval))	continue;      lll_futex_timed_wait (futex, newval, &rt, private);    try:      ;    }  while ((oldval = atomic_compare_and_exchange_val_acq (futex,							tid | FUTEX_WAITERS,							0)) != 0);  return 0;}