rt_benchs/communication_techniques/include/fast_forward_comm.h

#ifndef _SPECIFIC_COMM_H_
#define _SPECIFIC_COMM_H_ 1

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

#define SHARED_SPACE_SIZE (16 * BUF_SIZE)
#define SHARED_SPACE_VOIDPTR (SHARED_SPACE_SIZE / sizeof(void *))

#ifndef BUF_SIZE
#define BUF_SIZE CACHE_LINE_SIZE
#endif

#define DANGER (2 * BUF_SIZE / sizeof(void *))
#define GOOD (6 * BUF_SIZE / sizeof(void *))
#define ADJUST_FREQ 64

struct channel
{
	void * volatile *shared_space;
	unsigned int head __attribute__ ((aligned (CACHE_LINE_SIZE)));
	unsigned int tail __attribute__ ((aligned (CACHE_LINE_SIZE)));
};

__BEGIN_DECLS

extern int adjust_slip(struct channel *channel);

static inline void send(struct channel *channel, void **addr)
{
	static __thread unsigned int nb_iter = 0;

	assert(addr != NULL);
	if (nb_iter == ADJUST_FREQ)
	{
		adjust_slip(channel);
		nb_iter = 0;
	}
	while (1)
	{
		if (channel->shared_space[channel->head] != NULL)
			continue;
		channel->shared_space[channel->head] = addr;
		channel->head = (channel->head + 1) % SHARED_SPACE_VOIDPTR;
		break;
	}
}

__END_DECLS

#endif