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| /* | |
| * $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() | |
| * | |
| ****************/ | |
| /* 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. */ | |
| /* GCC >= 4.1 has built-in intrinsics. We'll use those */ | |
| /* 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. */ | |
| /* note that MSVC intrinsics _ReadWriteBarrier(), _ReadBarrier(), _WriteBarrier() are just compiler barriers *not* memory barriers */ | |