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81d65fcf7d
Previous version uses OSMemoryBarrier() on Apple but this is deprecated in macOS 10.12. Also, modify PRESUBMIT.py so that this patch is not blocked by CheckLongLines. Bug: chromium:1322548 Change-Id: I02c6b7682730abf718e88fc7f1bd4dcd7d347da6 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/256580 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Daniel.L (Byoungchan) Lee <daniel.l@hpcnt.com> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Artem Titov <titovartem@webrtc.org> Cr-Commit-Position: refs/heads/main@{#36873}
144 lines
6.2 KiB
C
144 lines
6.2 KiB
C
/*
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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
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*providing memory barriers, these functions should ensure that data cached in
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*registers is written out to cache where it can be snooped by other CPUs. (ie,
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*the volatile 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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#ifndef MODULES_THIRD_PARTY_PORTAUDIO_PA_MEMORYBARRIER_H_
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#define MODULES_THIRD_PARTY_PORTAUDIO_PA_MEMORYBARRIER_H_
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#if defined(__APPLE__)
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/* Support for the atomic library was added in C11.
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*/
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#if (__STDC_VERSION__ < 201112L) || defined(__STDC_NO_ATOMICS__)
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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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These were deprecated in MacOS 10.12. */
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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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#else
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#include <stdatomic.h>
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#define PaUtil_FullMemoryBarrier() atomic_thread_fence(memory_order_seq_cst)
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#define PaUtil_ReadMemoryBarrier() atomic_thread_fence(memory_order_acquire)
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#define PaUtil_WriteMemoryBarrier() atomic_thread_fence(memory_order_release)
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#endif
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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(),
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* _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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#endif /* MODULES_THIRD_PARTY_PORTAUDIO_PA_MEMORYBARRIER_H_ */
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