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