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/* Helper for simple message queues. */
#ifndef LIGHTNING_COMMON_MSG_QUEUE_H
#define LIGHTNING_COMMON_MSG_QUEUE_H
#include "config.h"
#include <ccan/io/io.h>
#include <ccan/short_types/short_types.h>
#include <ccan/take/take.h>
/* Reserved type used to indicate we're actually passing an fd. */
#define MSG_PASS_FD 0xFFFF
/* Allocate a new msg queue. */
struct msg_queue *msg_queue_new(const tal_t *ctx);
/* If add is taken(), freed after sending. msg_wake() implied. */
void msg_enqueue(struct msg_queue *q, const u8 *add TAKES);
/* Get current queue length */
size_t msg_queue_length(const struct msg_queue *q);
/* Fd is closed after sending. msg_wake() implied. */
void msg_enqueue_fd(struct msg_queue *q, int fd);
/* Explicitly wake up a msg_queue_wait */
void msg_wake(const struct msg_queue *q);
/* Returns NULL if nothing to do. */
const u8 *msg_dequeue(struct msg_queue *q);
/* Returns -1 if not an fd: close after sending. */
int msg_extract_fd(const u8 *msg);
#define msg_queue_wait(conn, q, next, arg) \
io_out_wait((conn), (q), (next), (arg))
#endif /* LIGHTNING_COMMON_MSG_QUEUE_H */