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* Software License Agreement (BSD License)                                                               *
* Author: Sebastien Decugis <sdecugis@freediameter.net>							 *
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#include "fdcore-internal.h"

/* The global message queues */
struct fifo * fd_g_incoming = NULL;
struct fifo * fd_g_outgoing = NULL;
struct fifo * fd_g_local = NULL;

/* Initialize the message queues. */
#define FD_MSG_QUEUE_SIZE	2048

int fd_queues_init(void)
{
	TRACE_ENTRY();
	CHECK_FCT( fd_fifo_new ( &fd_g_incoming, FD_MSG_QUEUE_SIZE ) );
	CHECK_FCT( fd_fifo_new ( &fd_g_outgoing, FD_MSG_QUEUE_SIZE ) );
	CHECK_FCT( fd_fifo_new ( &fd_g_local, FD_MSG_QUEUE_SIZE ) );
	return 0;
}

/* Destroy a queue after emptying it (and dumping the content) */
int fd_queues_fini(struct fifo ** queue)
{
	struct msg * msg;
	int ret = 0;
	
	TRACE_ENTRY("%p", queue);
	
	/* Note : the threads that post into this queue should already been stopped before this !!! */
	
	CHECK_PARAMS(queue);
	if (*queue == NULL)
		return 0; /* the queue was not already initialized */

	/* Empty all contents */
	while (1) {
		/* Check if there is a message in the queue */
		ret = fd_fifo_tryget(*queue, &msg);
		if (ret == EWOULDBLOCK)
			break;
		CHECK_FCT(ret);
		
		/* We got one! */
		fd_hook_call(HOOK_MESSAGE_DROPPED, msg, NULL, "Message lost because framework is terminating.", fd_msg_pmdl_get(msg));
		fd_msg_free(msg);
	}
	
	/* Now, delete the empty queue */
	CHECK_FCT( fd_fifo_del ( queue ) );
	
	return 0;
}
