95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
/*
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* Copyright (C) 2012 Thomas Preud'homme <thomas.preud-homme@lip6.fr>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* 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, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef _MCRINGBUFFER_COMMON_H_
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#define _MCRINGBUFFER_COMMON_H_ 1
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/* Non standard include */
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#include <commtech.h>
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#ifndef SHARED_SPACE_SIZE
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#define SHARED_SPACE_SIZE (250 * CACHE_LINE_SIZE) // Check with batchSize
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#endif
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#define SHARED_SPACE_VOIDPTR (SHARED_SPACE_SIZE / sizeof(void *))
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struct control
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{
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volatile unsigned int read;
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volatile unsigned int write;
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};
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struct cons
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{
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unsigned int localWrite;
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unsigned int nextRead;
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unsigned int rBatch;
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};
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struct prod
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{
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unsigned int localRead;
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unsigned int nextWrite;
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unsigned int wBatch;
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};
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struct channel
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{
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struct control ctrl __attribute__ ((aligned (CACHE_LINE_SIZE)));
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struct prod prod __attribute__ ((aligned (CACHE_LINE_SIZE)));
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struct cons cons __attribute__ ((aligned (CACHE_LINE_SIZE)));
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void * volatile *shared_space __attribute__ ((aligned (CACHE_LINE_SIZE))); // Align only to isolate cons on its cache line
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};
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__BEGIN_DECLS
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extern const unsigned int batchSize;
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static inline void send(struct channel *channel, void **addr)
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{
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while (1)
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{
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unsigned int afterNextWrite;
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afterNextWrite = (channel->prod.nextWrite + 1) % SHARED_SPACE_VOIDPTR;
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if (afterNextWrite == channel->prod.localRead)
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{
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if (afterNextWrite == channel->ctrl.read)
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continue;
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channel->prod.localRead = channel->ctrl.read;
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}
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channel->shared_space[channel->prod.nextWrite] = addr;
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channel->prod.nextWrite = afterNextWrite;
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channel->prod.wBatch++;
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if (channel->prod.wBatch >= batchSize)
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{
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channel->ctrl.write = channel->prod.nextWrite;
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channel->prod.wBatch = 0;
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}
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break;
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}
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}
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__END_DECLS
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#endif
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