SV platform dependency builds

/*

 * $Id: pa_memorybarrier.h 1240 2007-07-17 13:05:07Z bjornroche $

 * Portable Audio I/O Library

 * Memory barrier utilities

 *

 * Author: Bjorn Roche, XO Audio, LLC

 *

 * This program uses the PortAudio Portable Audio Library.

 * For more information see: http://www.portaudio.com

 * Copyright (c) 1999-2000 Ross Bencina and Phil Burk

 *

 * Permission is hereby granted, free of charge, to any person obtaining

 * a copy of this software and associated documentation files

 * (the "Software"), to deal in the Software without restriction,

 * including without limitation the rights to use, copy, modify, merge,

 * publish, distribute, sublicense, and/or sell copies of the Software,

 * and to permit persons to whom the Software is furnished to do so,

 * subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be

 * included in all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR

 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF

 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 */

/*

 * The text above constitutes the entire PortAudio license; however, 

 * the PortAudio community also makes the following non-binding requests:

 *

 * Any person wishing to distribute modifications to the Software is

 * requested to send the modifications to the original developer so that

 * they can be incorporated into the canonical version. It is also 

 * requested that these non-binding requests be included along with the 

 * license above.

 */

/**

 @file pa_memorybarrier.h

 @ingroup common_src

*/

/****************

 * Some memory barrier primitives based on the system.

 * right now only OS X, FreeBSD, and Linux are supported. In addition to providing

 * memory barriers, these functions should ensure that data cached in registers

 * is written out to cache where it can be snooped by other CPUs. (ie, the volatile

 * keyword should not be required)

 *

 * the primitives that must be defined are:

 *

 * PaUtil_FullMemoryBarrier()

 * PaUtil_ReadMemoryBarrier()

 * PaUtil_WriteMemoryBarrier()

 *

 ****************/

#if defined(__APPLE__)

#   include <libkern/OSAtomic.h>

    /* Here are the memory barrier functions. Mac OS X only provides

       full memory barriers, so the three types of barriers are the same,

       however, these barriers are superior to compiler-based ones. */

#   define PaUtil_FullMemoryBarrier()  OSMemoryBarrier()

#   define PaUtil_ReadMemoryBarrier()  OSMemoryBarrier()

#   define PaUtil_WriteMemoryBarrier() OSMemoryBarrier()

#elif defined(__GNUC__)

    /* GCC >= 4.1 has built-in intrinsics. We'll use those */

#   if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)

#      define PaUtil_FullMemoryBarrier()  __sync_synchronize()

#      define PaUtil_ReadMemoryBarrier()  __sync_synchronize()

#      define PaUtil_WriteMemoryBarrier() __sync_synchronize()

    /* as a fallback, GCC understands volatile asm and "memory" to mean it

     * should not reorder memory read/writes */

    /* Note that it is not clear that any compiler actually defines __PPC__,

     * it can probably removed safely. */

#   elif defined( __ppc__ ) || defined( __powerpc__) || defined( __PPC__ )

#      define PaUtil_FullMemoryBarrier()  asm volatile("sync":::"memory")

#      define PaUtil_ReadMemoryBarrier()  asm volatile("sync":::"memory")

#      define PaUtil_WriteMemoryBarrier() asm volatile("sync":::"memory")

#   elif defined( __i386__ ) || defined( __i486__ ) || defined( __i586__ ) || \

         defined( __i686__ ) || defined( __x86_64__ )

#      define PaUtil_FullMemoryBarrier()  asm volatile("mfence":::"memory")

#      define PaUtil_ReadMemoryBarrier()  asm volatile("lfence":::"memory")

#      define PaUtil_WriteMemoryBarrier() asm volatile("sfence":::"memory")

#   else

#      ifdef ALLOW_SMP_DANGERS

#         warning Memory barriers not defined on this system or system unknown

#         warning For SMP safety, you should fix this.

#         define PaUtil_FullMemoryBarrier()

#         define PaUtil_ReadMemoryBarrier()

#         define PaUtil_WriteMemoryBarrier()

#      else

#         error Memory barriers are not defined on this system. You can still compile by defining ALLOW_SMP_DANGERS, but SMP safety will not be guaranteed.

#      endif

#   endif

#elif (_MSC_VER >= 1400) && !defined(_WIN32_WCE)

#   include <intrin.h>

#   pragma intrinsic(_ReadWriteBarrier)

#   pragma intrinsic(_ReadBarrier)

#   pragma intrinsic(_WriteBarrier)

/* note that MSVC intrinsics _ReadWriteBarrier(), _ReadBarrier(), _WriteBarrier() are just compiler barriers *not* memory barriers */

#   define PaUtil_FullMemoryBarrier()  _ReadWriteBarrier()

#   define PaUtil_ReadMemoryBarrier()  _ReadBarrier()

#   define PaUtil_WriteMemoryBarrier() _WriteBarrier()

#elif defined(_WIN32_WCE)

#   define PaUtil_FullMemoryBarrier()

#   define PaUtil_ReadMemoryBarrier()

#   define PaUtil_WriteMemoryBarrier()

#elif defined(_MSC_VER) || defined(__BORLANDC__)

#   define PaUtil_FullMemoryBarrier()  _asm { lock add    [esp], 0 }

#   define PaUtil_ReadMemoryBarrier()  _asm { lock add    [esp], 0 }

#   define PaUtil_WriteMemoryBarrier() _asm { lock add    [esp], 0 }

#else

#   ifdef ALLOW_SMP_DANGERS

#      warning Memory barriers not defined on this system or system unknown

#      warning For SMP safety, you should fix this.

#      define PaUtil_FullMemoryBarrier()

#      define PaUtil_ReadMemoryBarrier()

#      define PaUtil_WriteMemoryBarrier()

#   else

#      error Memory barriers are not defined on this system. You can still compile by defining ALLOW_SMP_DANGERS, but SMP safety will not be guaranteed.

#   endif

#endif