Re: [dpdk-dev] [PATCH 02/15] eal/tile: add atomic operations for TileGx

[Neil Horman <nhorman@tuxdriver.com>]

On Mon, Dec 08, 2014 at 04:59:25PM +0800, Zhigang Lu wrote:
> This patch adds architecture specific memory barrier operations for
> TileGx.
> 
> Signed-off-by: Zhigang Lu <zlu@ezchip.com>
> Signed-off-by: Cyril Chemparathy <cchemparathy@ezchip.com>
> ---
>  .../common/include/arch/tile/rte_atomic.h          | 62 ++++++++++++++++++++++
>  1 file changed, 62 insertions(+)
>  create mode 100644 lib/librte_eal/common/include/arch/tile/rte_atomic.h
> 
> diff --git a/lib/librte_eal/common/include/arch/tile/rte_atomic.h b/lib/librte_eal/common/include/arch/tile/rte_atomic.h
> new file mode 100644
> index 0000000..24c9b0a
> --- /dev/null
> +++ b/lib/librte_eal/common/include/arch/tile/rte_atomic.h
> @@ -0,0 +1,62 @@
> +/*-
> + *   BSD LICENSE
> + *
> + *   Copyright(c) 2014 Tilera Corporation. All rights reserved.
> + *   All rights reserved.
> + *
> + *   Redistribution and use in source and binary forms, with or without
> + *   modification, are permitted provided that the following conditions
> + *   are met:
> + *
> + *     * Redistributions of source code must retain the above copyright
> + *       notice, this list of conditions and the following disclaimer.
> + *     * Redistributions in binary form must reproduce the above copyright
> + *       notice, this list of conditions and the following disclaimer in
> + *       the documentation and/or other materials provided with the
> + *       distribution.
> + *     * Neither the name of Tilera Corporation nor the names of its
> + *       contributors may be used to endorse or promote products derived
> + *       from this software without specific prior written permission.
> + *
> + *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> + *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
> + *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
> + *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
> + *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
> + *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
> + *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
> + *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
> + *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
> + *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + */
> +
> +#ifndef _RTE_ATOMIC_TILE_H_
> +#define _RTE_ATOMIC_TILE_H_
> +
> +#ifdef __cplusplus
> +extern "C" {
> +#endif
> +
> +#include "generic/rte_atomic.h"
> +
> +static inline void rte_mb(void)
> +{
> +	__sync_synchronize();
> +}
> +
> +static inline void rte_wmb(void)
> +{
> +	__sync_synchronize();
> +}
> +
> +static inline void rte_rmb(void)
> +{
> +	__sync_synchronize();
I don't see __sync_synchronize defined anywhere.  Is that an intrinsic for gcc,
or a library call?

Neil