60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
#ifndef _BATCH_QUEUE_COMMON_COMM_H_
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#define _BATCH_QUEUE_COMMON_COMM_H_ 1
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#include <stdint.h>
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#include <unistd.h>
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/* Non standard include */
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#include <commtech.h>
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#ifndef BUF_SIZE
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#define BUF_SIZE (32 * CACHE_LINE_SIZE)
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#endif
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struct channel
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{
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/* buf must be the first field to allow the buf_mask test */
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void * volatile buf[2][BUF_SIZE / sizeof(void *)] __attribute__ ((aligned (CACHE_LINE_SIZE)));
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int unused[20] __attribute__ ((aligned (CACHE_LINE_SIZE)));
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volatile unsigned int state:1 __attribute__ ((aligned (CACHE_LINE_SIZE)));
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/* accesses to buf[0] and state */
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struct channel *mapping1 __attribute__ ((aligned (CACHE_LINE_SIZE)));
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/* accesses to buf[1] */
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struct channel *mapping2;
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void * volatile *buf_end1;
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void * volatile *buf_end2;
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void * volatile *sender_ptr __attribute__ ((aligned (CACHE_LINE_SIZE)));
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void * volatile *sender_ptr_end;
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void * volatile *receiver_ptr __attribute__ ((aligned (CACHE_LINE_SIZE)));
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};
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__BEGIN_DECLS
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static inline void send(struct channel *channel, void **addr)
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{
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*channel->sender_ptr++ = addr;
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if (unlikely(channel->sender_ptr == channel->sender_ptr_end))
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{
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while (channel->state);
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channel->state = 1;
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if (channel->sender_ptr_end == channel->buf_end1)
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{
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channel->sender_ptr = channel->mapping2->buf[1];
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channel->sender_ptr_end = channel->buf_end2;
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}
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else
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{
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channel->sender_ptr = channel->buf[0];
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channel->sender_ptr_end = channel->buf_end1;
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}
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}
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}
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__END_DECLS
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#endif
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