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lightningd/msg_queue: helper for queues of messages/

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Since they're short, we use a simple array.  This can be replaced later.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2017-03-10 21:14:40 +10:30
parent 5277787db5
commit cd62b74b1c
3 changed files with 53 additions and 1 deletions
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3
lightningd/Makefile
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@ -46,7 +46,8 @@ LIGHTNINGD_LIB_SRC := \
lightningd/funding_tx.c \
lightningd/htlc_tx.c \
lightningd/key_derive.c \
lightningd/peer_failed.c \
lightningd/msg_queue.c \
lightningd/peer_failed.c \
lightningd/utxo.c
LIGHTNINGD_LIB_OBJS := $(LIGHTNINGD_LIB_SRC:.c=.o)

30
lightningd/msg_queue.c Normal file
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@ -0,0 +1,30 @@
#include <lightningd/msg_queue.h>
void msg_queue_init(struct msg_queue *q, const tal_t *ctx)
{
q->q = tal_arr(ctx, const u8 *, 0);
}
void msg_enqueue(struct msg_queue *q, const u8 *add)
{
size_t n = tal_count(q->q);
tal_resize(&q->q, n+1);
q->q[n] = add;
/* In case someone is waiting */
io_wake(q);
}
const u8 *msg_dequeue(struct msg_queue *q)
{
size_t n = tal_count(q->q);
const u8 *msg;
if (!n)
return NULL;
msg = q->q[0];
memmove(q->q, q->q + 1, sizeof(*q->q) * (n-1));
tal_resize(&q->q, n-1);
return msg;
}

21
lightningd/msg_queue.h Normal file
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@ -0,0 +1,21 @@
/* Helper for simple message queues. */
#ifndef LIGHTNING_LIGHTNINGD_MSG_QUEUE_H
#define LIGHTNING_LIGHTNINGD_MSG_QUEUE_H
#include "config.h"
#include <ccan/io/io.h>
#include <ccan/short_types/short_types.h>
struct msg_queue {
const u8 **q;
};
void msg_queue_init(struct msg_queue *q, const tal_t *ctx);
void msg_enqueue(struct msg_queue *q, const u8 *add);
const u8 *msg_dequeue(struct msg_queue *q);
#define msg_queue_wait(conn, q, next, arg) \
io_out_wait((conn), (q), (next), (arg))
#endif /* LIGHTNING_LIGHTNINGD_MSG_QUEUE_H */