/* sem_timedwait -- wait on a semaphore.  Generic futex-using version.   Copyright (C) 2003, 2007 Free Software Foundation, Inc.   This file is part of the GNU C Library.   Contributed by Paul Mackerras <paulus@au.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 <internaltypes.h>#include <semaphore.h>#include <pthreadP.h>#include <shlib-compat.h>extern void __sem_wait_cleanup (void *arg) attribute_hidden;intsem_timedwait (sem_t *sem, const struct timespec *abstime){  struct sparc_new_sem *isem = (struct sparc_new_sem *) sem;  int err;  if (atomic_decrement_if_positive (&isem->value) > 0)    return 0;  if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)    {      __set_errno (EINVAL);      return -1;    }  atomic_increment (&isem->nwaiters);  pthread_cleanup_push (__sem_wait_cleanup, isem);  while (1)    {      struct timeval tv;      struct timespec rt;      int sec, nsec;      /* Get the current time.  */      __gettimeofday (&tv, NULL);      /* Compute relative timeout.  */      sec = abstime->tv_sec - tv.tv_sec;      nsec = abstime->tv_nsec - tv.tv_usec * 1000;      if (nsec < 0)	{	  nsec += 1000000000;	  --sec;	}      /* Already timed out?  */      err = -ETIMEDOUT;      if (sec < 0)	{	  __set_errno (ETIMEDOUT);	  err = -1;	  break;	}      /* Do wait.  */      rt.tv_sec = sec;      rt.tv_nsec = nsec;      /* Enable asynchronous cancellation.  Required by the standard.  */      int oldtype = __pthread_enable_asynccancel ();      err = lll_futex_timed_wait (&isem->value, 0, &rt,				  isem->private ^ FUTEX_PRIVATE_FLAG);      /* Disable asynchronous cancellation.  */      __pthread_disable_asynccancel (oldtype);      if (err != 0 && err != -EWOULDBLOCK)	{	  __set_errno (-err);	  err = -1;	  break;	}      if (atomic_decrement_if_positive (&isem->value) > 0)	{	  err = 0;	  break;	}    }  pthread_cleanup_pop (0);  atomic_decrement (&isem->nwaiters);  return err;}