Seastar
High performance C++ framework for concurrent servers
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udp.hh
1/*
2 * This file is open source software, licensed to you under the terms
3 * of the Apache License, Version 2.0 (the "License"). See the NOTICE file
4 * distributed with this work for additional information regarding copyright
5 * ownership. You may not use this file except in compliance with the License.
6 *
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing,
12 * software distributed under the License is distributed on an
13 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14 * KIND, either express or implied. See the License for the
15 * specific language governing permissions and limitations
16 * under the License.
17 */
18/*
19 * Copyright (C) 2014 Cloudius Systems, Ltd.
20 *
21 */
22
23#pragma once
24
25#ifndef SEASTAR_MODULE
26#include <unordered_map>
27#include <assert.h>
28#endif
29
30#include <seastar/core/shared_ptr.hh>
31#include <seastar/net/api.hh>
32#include <seastar/net/const.hh>
33#include <seastar/net/net.hh>
34#include <seastar/util/modules.hh>
35
36namespace seastar {
37
38namespace net {
39
40struct udp_hdr {
41 packed<uint16_t> src_port;
42 packed<uint16_t> dst_port;
44 packed<uint16_t> cksum;
45
46 template<typename Adjuster>
47 auto adjust_endianness(Adjuster a) {
48 return a(src_port, dst_port, len, cksum);
49 }
50} __attribute__((packed));
51
53 queue<datagram> _queue;
54 // Limit number of data queued into send queue
55 semaphore _user_queue_space = {212992};
56 udp_channel_state(size_t queue_size) : _queue(queue_size) {}
57 future<> wait_for_send_buffer(size_t len) { return _user_queue_space.wait(len); }
58 void complete_send(size_t len) { _user_queue_space.signal(len); }
59};
60
61}
62
63}
future wait(size_t nr=1) noexcept
Definition: semaphore.hh:299
void signal(size_t nr=1) noexcept
Definition: semaphore.hh:396
A representation of a possibly not-yet-computed value.
Definition: future.hh:1240
Definition: queue.hh:44
Seastar API namespace.
Definition: abort_on_ebadf.hh:26
Definition: udp.hh:52
Definition: udp.hh:40
Definition: unaligned.hh:58