rt_benchs/communication_techniques/include/mcringbuffer_comm.h

#ifndef _SPECIFIC_COMM_H_
#define _SPECIFIC_COMM_H_ 1

/* Non standard include */
#include <commtech.h>

#define SHARED_SPACE_SIZE (250 * CACHE_LINE_SIZE) // Check with batchSize
#define SHARED_SPACE_VOIDPTR (SHARED_SPACE_SIZE / sizeof(void *))

struct control
{
	volatile unsigned int read;
	volatile unsigned int write;
};

struct cons
{
	unsigned int localWrite;
	unsigned int nextRead;
	unsigned int rBatch;
};

struct prod
{
	unsigned int localRead;
	unsigned int nextWrite;
	unsigned int wBatch;
};


struct channel
{
	struct control ctrl __attribute__ ((aligned (CACHE_LINE_SIZE)));
	struct prod prod __attribute__ ((aligned (CACHE_LINE_SIZE)));
	struct cons cons __attribute__ ((aligned (CACHE_LINE_SIZE)));
	void * volatile *shared_space __attribute__ ((aligned (CACHE_LINE_SIZE))); // Align only to isolate cons on its cache line
};

__BEGIN_DECLS

extern const unsigned int batchSize;

static inline void send(struct channel *channel, void **addr)
{
	while (1)
	{
		unsigned int afterNextWrite;

		afterNextWrite = (channel->prod.nextWrite + 1) % SHARED_SPACE_VOIDPTR;
		if (afterNextWrite == channel->prod.localRead)
		{
			if (afterNextWrite == channel->ctrl.read)
				continue;
			channel->prod.localRead = channel->ctrl.read;
		}
		channel->shared_space[channel->prod.nextWrite] = addr;
		channel->prod.nextWrite = afterNextWrite;
		channel->prod.wBatch++;
		if (channel->prod.wBatch >= batchSize)
		{
			channel->ctrl.write = channel->prod.nextWrite;
			channel->prod.wBatch = 0;
		}
		break;
	}
}

__END_DECLS

#endif