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984375c0b2
Simplify the ringbuffer code by using ideas from the portaudio ringbuffer implementation.
51 lines
1.7 KiB
C
51 lines
1.7 KiB
C
/* Simple Plugin API
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* Copyright (C) 2016 Wim Taymans <wim.taymans@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __SPA_BARRIER_H__
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#define __SPA_BARRIER_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <spa/defs.h>
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#if defined(__GNUC__)
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# if defined( __i386__ ) || defined( __i486__ ) || defined( __i586__ ) || defined( __i686__ ) || defined( __x86_64__ )
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# define spa_barrier_full() asm volatile("mfence":::"memory")
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# define spa_barrier_read() asm volatile("lfence":::"memory")
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# define spa_barrier_write() asm volatile("sfence":::"memory")
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# elif (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)
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# define spa_barrier_full() __sync_synchronize()
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# define spa_barrier_read() __sync_synchronize()
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# define spa_barrier_write() __sync_synchronize()
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# endif
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#else
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# warning no memory barriers support found
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# define spa_barrier_full()
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# define spa_barrier_read()
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# define spa_barrier_write()
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#endif
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* __SPA_BARRIER_H__ */
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