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Andrew Gundersen
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src/pa_memorybarrier.h
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src/pa_memorybarrier.h
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/*
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* $Id: pa_memorybarrier.h 1240 2007-07-17 13:05:07Z bjornroche $
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* Portable Audio I/O Library
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* Memory barrier utilities
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*
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* Author: Bjorn Roche, XO Audio, LLC
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*
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* This program uses the PortAudio Portable Audio Library.
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* For more information see: http://www.portaudio.com
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* Copyright (c) 1999-2000 Ross Bencina and Phil Burk
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* The text above constitutes the entire PortAudio license; however,
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* the PortAudio community also makes the following non-binding requests:
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*
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* Any person wishing to distribute modifications to the Software is
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* requested to send the modifications to the original developer so that
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* they can be incorporated into the canonical version. It is also
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* requested that these non-binding requests be included along with the
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* license above.
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*/
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/**
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@file pa_memorybarrier.h
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@ingroup common_src
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*/
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/****************
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* Some memory barrier primitives based on the system.
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* right now only OS X, FreeBSD, and Linux are supported. In addition to providing
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* memory barriers, these functions should ensure that data cached in registers
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* is written out to cache where it can be snooped by other CPUs. (ie, the volatile
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* keyword should not be required)
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*
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* the primitives that must be defined are:
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*
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* PaUtil_FullMemoryBarrier()
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* PaUtil_ReadMemoryBarrier()
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* PaUtil_WriteMemoryBarrier()
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*
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****************/
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#if defined(__APPLE__)
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# include <libkern/OSAtomic.h>
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/* Here are the memory barrier functions. Mac OS X only provides
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full memory barriers, so the three types of barriers are the same,
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however, these barriers are superior to compiler-based ones. */
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# define PaUtil_FullMemoryBarrier() OSMemoryBarrier()
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# define PaUtil_ReadMemoryBarrier() OSMemoryBarrier()
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# define PaUtil_WriteMemoryBarrier() OSMemoryBarrier()
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#elif defined(__GNUC__)
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/* GCC >= 4.1 has built-in intrinsics. We'll use those */
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# if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)
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# define PaUtil_FullMemoryBarrier() __sync_synchronize()
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# define PaUtil_ReadMemoryBarrier() __sync_synchronize()
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# define PaUtil_WriteMemoryBarrier() __sync_synchronize()
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/* as a fallback, GCC understands volatile asm and "memory" to mean it
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* should not reorder memory read/writes */
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/* Note that it is not clear that any compiler actually defines __PPC__,
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* it can probably removed safely. */
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# elif defined( __ppc__ ) || defined( __powerpc__) || defined( __PPC__ )
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# define PaUtil_FullMemoryBarrier() asm volatile("sync":::"memory")
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# define PaUtil_ReadMemoryBarrier() asm volatile("sync":::"memory")
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# define PaUtil_WriteMemoryBarrier() asm volatile("sync":::"memory")
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# elif defined( __i386__ ) || defined( __i486__ ) || defined( __i586__ ) || \
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defined( __i686__ ) || defined( __x86_64__ )
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# define PaUtil_FullMemoryBarrier() asm volatile("mfence":::"memory")
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# define PaUtil_ReadMemoryBarrier() asm volatile("lfence":::"memory")
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# define PaUtil_WriteMemoryBarrier() asm volatile("sfence":::"memory")
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# else
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# ifdef ALLOW_SMP_DANGERS
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# warning Memory barriers not defined on this system or system unknown
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# warning For SMP safety, you should fix this.
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# define PaUtil_FullMemoryBarrier()
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# define PaUtil_ReadMemoryBarrier()
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# define PaUtil_WriteMemoryBarrier()
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# else
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# 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.
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# endif
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# endif
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#elif (_MSC_VER >= 1400) && !defined(_WIN32_WCE)
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# include <intrin.h>
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# pragma intrinsic(_ReadWriteBarrier)
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# pragma intrinsic(_ReadBarrier)
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# pragma intrinsic(_WriteBarrier)
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/* note that MSVC intrinsics _ReadWriteBarrier(), _ReadBarrier(), _WriteBarrier() are just compiler barriers *not* memory barriers */
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# define PaUtil_FullMemoryBarrier() _ReadWriteBarrier()
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# define PaUtil_ReadMemoryBarrier() _ReadBarrier()
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# define PaUtil_WriteMemoryBarrier() _WriteBarrier()
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#elif defined(_WIN32_WCE)
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# define PaUtil_FullMemoryBarrier()
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# define PaUtil_ReadMemoryBarrier()
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# define PaUtil_WriteMemoryBarrier()
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#elif defined(_MSC_VER) || defined(__BORLANDC__)
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# define PaUtil_FullMemoryBarrier() _asm { lock add [esp], 0 }
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# define PaUtil_ReadMemoryBarrier() _asm { lock add [esp], 0 }
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# define PaUtil_WriteMemoryBarrier() _asm { lock add [esp], 0 }
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#else
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# ifdef ALLOW_SMP_DANGERS
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# warning Memory barriers not defined on this system or system unknown
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# warning For SMP safety, you should fix this.
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# define PaUtil_FullMemoryBarrier()
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# define PaUtil_ReadMemoryBarrier()
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# define PaUtil_WriteMemoryBarrier()
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# else
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# 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.
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# endif
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#endif
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