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/* Copyright (C) 2010-2016 Free Software Foundation, Inc.
This file is part of the UPC runtime Library.
Written by Gary Funck <gary@intrepid.com>
and Nenad Vukicevic <nenad@intrepid.com>
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC 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 General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "upc_config.h"
#include "upc_sysdep.h"
#include "upc_defs.h"
/* On some 32 bit targets 64 bit CSWAP is not available. */
#if !defined (__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8)
/* Use OS spin lock to protect the critical section. */
unsigned char
__sync_bool_compare_and_swap_8 (long long *addr, long long exp, long long val)
{
unsigned char result = 0;
upc_info_p u = __upc_info;
__upc_acquire_lock (&u->lock);
if (*addr == exp)
{
*addr = val;
result = 1;
}
__upc_release_lock (&u->lock);
return result;
}
#endif
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