File: atomic.h

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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
 *                         University Research and Technology
 *                         Corporation.  All rights reserved.
 * Copyright (c) 2004-2013 The University of Tennessee and The University
 *                         of Tennessee Research Foundation.  All rights
 *                         reserved.
 * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart, 
 *                         University of Stuttgart.  All rights reserved.
 * Copyright (c) 2004-2005 The Regents of the University of California.
 *                         All rights reserved.
 * Copyright (c) 2011      Sandia National Laboratories. All rights reserved.
 * Copyright (c) 2014      Los Alamos National Security, LLC. All rights
 *                         reserved.
 * $COPYRIGHT$
 * 
 * Additional copyrights may follow
 * 
 * $HEADER$
 */

#ifndef OPAL_SYS_ARCH_ATOMIC_H
#define OPAL_SYS_ARCH_ATOMIC_H 1

/**********************************************************************
 *
 * Memory Barriers
 *
 *********************************************************************/
#define OPAL_HAVE_ATOMIC_MEM_BARRIER 1

static inline void opal_atomic_mb(void)
{
    __sync_synchronize();
}

static inline void opal_atomic_rmb(void)
{
    __sync_synchronize();
}

static inline void opal_atomic_wmb(void)
{
    __sync_synchronize();
}

#if OPAL_WANT_SMP_LOCKS
#define MB() opal_atomic_mb()
#else
#define MB()
#endif

/**********************************************************************
 *
 * Atomic math operations
 *
 *********************************************************************/

#define OPAL_HAVE_ATOMIC_CMPSET_32 1
static inline int opal_atomic_cmpset_acq_32( volatile int32_t *addr,
                                             int32_t oldval, int32_t newval)
{
    return __sync_bool_compare_and_swap(addr, oldval, newval);
}


static inline int opal_atomic_cmpset_rel_32( volatile int32_t *addr,
                                             int32_t oldval, int32_t newval)
{
    return __sync_bool_compare_and_swap(addr, oldval, newval);}

static inline int opal_atomic_cmpset_32( volatile int32_t *addr,
                                         int32_t oldval, int32_t newval)
{
    return __sync_bool_compare_and_swap(addr, oldval, newval);
}

#define OPAL_HAVE_ATOMIC_MATH_32 1

#define OPAL_HAVE_ATOMIC_ADD_32 1
static inline int32_t opal_atomic_add_32(volatile int32_t *addr, int32_t delta)
{
    return __sync_add_and_fetch(addr, delta);
}

#define OPAL_HAVE_ATOMIC_SUB_32 1
static inline int32_t opal_atomic_sub_32(volatile int32_t *addr, int32_t delta)
{
    return __sync_sub_and_fetch(addr, delta);
}

#define OPAL_HAVE_ATOMIC_CMPSET_64 0

#endif /* ! OPAL_SYS_ARCH_ATOMIC_H */