#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>

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


__thread struct comm_channel channel;

void init_thread_comm(struct thread_comm *comm)
{
	comm->receiver_idx = 0;
	comm->channel = &channel;
	comm->channel->state = 0;
	comm->channel->idx = 0;
}

char *dstr="buffer transition\n";

void _swap_buffer()
{
	asm volatile(".globl swap_buffer\n\t"
		"swap_buffer:\n\t"

		"1:\n\t"
		"testl $1,   %%gs:channel@NTPOFF + 2 *" toString(BUF_SIZE) "\n\t"
		"jnz 1b\n\t"
		"movl  $1,   %%gs:channel@NTPOFF + 2 *" toString(BUF_SIZE) "\n\t"
		"jmp  *%%eax\n\t"
		: : "m"(dstr));
}

void reception(void (*on_receive)(void *))
{
	wait_initialization();
	/* printf("Activate the consumer...\n"); */
	while (cont)
	{
		int i;

		for (i = 0; i < nb_prod; i++)
		{
			if(tcomms[i].channel->state)
			{
				int j, n;
				/* 
				 * cur->receiver_idx point to the last cache
				 * line we have read. We go to the next cache
				 * line "+ (CACHE_LINE_SIZE >> 2)" (because
				 * the line is full of integer (2^2 octets)
				 * and then if we are after the second cache
				 * line we correct the pointer to point to
				 * the first one (this is done by the modulo)
				 */
				j = tcomms[i].receiver_idx;
				n = tcomms[i].receiver_idx + (BUF_SIZE / sizeof(void *));
				tcomms[i].receiver_idx = n % ((2 * BUF_SIZE) / sizeof(void *));
				for(; j<n; j++)
				{
					/* 
					 * The behaviour of this is not documented but we know
					 * the values inside buf won't change during this affectation
					 */
					on_receive((void *) tcomms[i].channel->buf[j]);
				}
				tcomms[i].channel->state = 0;
			}
		}
	}
}