Simon Cooksey / mbed-os

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features/netsocket/UDPSocket.cpp@0:fb7af294d5d9, 2016-11-17 (annotated)

Committer:
Simon Cooksey
Date:
Thu Nov 17 16:43:53 2016 +0000
Revision:
0:fb7af294d5d9
Initial commit

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Simon Cooksey 0:fb7af294d5d9 1 /* Socket
Simon Cooksey 0:fb7af294d5d9 2 * Copyright (c) 2015 ARM Limited
Simon Cooksey 0:fb7af294d5d9 3 *
Simon Cooksey 0:fb7af294d5d9 4 * Licensed under the Apache License, Version 2.0 (the "License");
Simon Cooksey 0:fb7af294d5d9 5 * you may not use this file except in compliance with the License.
Simon Cooksey 0:fb7af294d5d9 6 * You may obtain a copy of the License at
Simon Cooksey 0:fb7af294d5d9 7 *
Simon Cooksey 0:fb7af294d5d9 8 * http://www.apache.org/licenses/LICENSE-2.0
Simon Cooksey 0:fb7af294d5d9 9 *
Simon Cooksey 0:fb7af294d5d9 10 * Unless required by applicable law or agreed to in writing, software
Simon Cooksey 0:fb7af294d5d9 11 * distributed under the License is distributed on an "AS IS" BASIS,
Simon Cooksey 0:fb7af294d5d9 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Simon Cooksey 0:fb7af294d5d9 13 * See the License for the specific language governing permissions and
Simon Cooksey 0:fb7af294d5d9 14 * limitations under the License.
Simon Cooksey 0:fb7af294d5d9 15 */
Simon Cooksey 0:fb7af294d5d9 16
Simon Cooksey 0:fb7af294d5d9 17 #include "UDPSocket.h"
Simon Cooksey 0:fb7af294d5d9 18 #include "Timer.h"
Simon Cooksey 0:fb7af294d5d9 19 #include "mbed_assert.h"
Simon Cooksey 0:fb7af294d5d9 20
Simon Cooksey 0:fb7af294d5d9 21 UDPSocket::UDPSocket()
Simon Cooksey 0:fb7af294d5d9 22 : _pending(0), _read_sem(0), _write_sem(0),
Simon Cooksey 0:fb7af294d5d9 23 _read_in_progress(false), _write_in_progress(false)
Simon Cooksey 0:fb7af294d5d9 24 {
Simon Cooksey 0:fb7af294d5d9 25 }
Simon Cooksey 0:fb7af294d5d9 26
Simon Cooksey 0:fb7af294d5d9 27 UDPSocket::~UDPSocket()
Simon Cooksey 0:fb7af294d5d9 28 {
Simon Cooksey 0:fb7af294d5d9 29 close();
Simon Cooksey 0:fb7af294d5d9 30 }
Simon Cooksey 0:fb7af294d5d9 31
Simon Cooksey 0:fb7af294d5d9 32 nsapi_protocol_t UDPSocket::get_proto()
Simon Cooksey 0:fb7af294d5d9 33 {
Simon Cooksey 0:fb7af294d5d9 34 return NSAPI_UDP;
Simon Cooksey 0:fb7af294d5d9 35 }
Simon Cooksey 0:fb7af294d5d9 36
Simon Cooksey 0:fb7af294d5d9 37 int UDPSocket::sendto(const char *host, uint16_t port, const void *data, unsigned size)
Simon Cooksey 0:fb7af294d5d9 38 {
Simon Cooksey 0:fb7af294d5d9 39 SocketAddress address;
Simon Cooksey 0:fb7af294d5d9 40 int err = _stack->gethostbyname(host, &address);
Simon Cooksey 0:fb7af294d5d9 41 if (err) {
Simon Cooksey 0:fb7af294d5d9 42 return NSAPI_ERROR_DNS_FAILURE;
Simon Cooksey 0:fb7af294d5d9 43 }
Simon Cooksey 0:fb7af294d5d9 44
Simon Cooksey 0:fb7af294d5d9 45 address.set_port(port);
Simon Cooksey 0:fb7af294d5d9 46
Simon Cooksey 0:fb7af294d5d9 47 // sendto is thread safe
Simon Cooksey 0:fb7af294d5d9 48 return sendto(address, data, size);
Simon Cooksey 0:fb7af294d5d9 49 }
Simon Cooksey 0:fb7af294d5d9 50
Simon Cooksey 0:fb7af294d5d9 51 int UDPSocket::sendto(const SocketAddress &address, const void *data, unsigned size)
Simon Cooksey 0:fb7af294d5d9 52 {
Simon Cooksey 0:fb7af294d5d9 53 _lock.lock();
Simon Cooksey 0:fb7af294d5d9 54 int ret;
Simon Cooksey 0:fb7af294d5d9 55
Simon Cooksey 0:fb7af294d5d9 56 // If this assert is hit then there are two threads
Simon Cooksey 0:fb7af294d5d9 57 // performing a send at the same time which is undefined
Simon Cooksey 0:fb7af294d5d9 58 // behavior
Simon Cooksey 0:fb7af294d5d9 59 MBED_ASSERT(!_write_in_progress);
Simon Cooksey 0:fb7af294d5d9 60 _write_in_progress = true;
Simon Cooksey 0:fb7af294d5d9 61
Simon Cooksey 0:fb7af294d5d9 62 while (true) {
Simon Cooksey 0:fb7af294d5d9 63 if (!_socket) {
Simon Cooksey 0:fb7af294d5d9 64 ret = NSAPI_ERROR_NO_SOCKET;
Simon Cooksey 0:fb7af294d5d9 65 break;
Simon Cooksey 0:fb7af294d5d9 66 }
Simon Cooksey 0:fb7af294d5d9 67
Simon Cooksey 0:fb7af294d5d9 68 _pending = 0;
Simon Cooksey 0:fb7af294d5d9 69 int sent = _stack->socket_sendto(_socket, address, data, size);
Simon Cooksey 0:fb7af294d5d9 70 if ((0 == _timeout) || (NSAPI_ERROR_WOULD_BLOCK != sent)) {
Simon Cooksey 0:fb7af294d5d9 71 ret = sent;
Simon Cooksey 0:fb7af294d5d9 72 break;
Simon Cooksey 0:fb7af294d5d9 73 } else {
Simon Cooksey 0:fb7af294d5d9 74 int32_t count;
Simon Cooksey 0:fb7af294d5d9 75
Simon Cooksey 0:fb7af294d5d9 76 // Release lock before blocking so other threads
Simon Cooksey 0:fb7af294d5d9 77 // accessing this object aren't blocked
Simon Cooksey 0:fb7af294d5d9 78 _lock.unlock();
Simon Cooksey 0:fb7af294d5d9 79 count = _write_sem.wait(_timeout);
Simon Cooksey 0:fb7af294d5d9 80 _lock.lock();
Simon Cooksey 0:fb7af294d5d9 81
Simon Cooksey 0:fb7af294d5d9 82 if (count < 1) {
Simon Cooksey 0:fb7af294d5d9 83 // Semaphore wait timed out so break out and return
Simon Cooksey 0:fb7af294d5d9 84 ret = NSAPI_ERROR_WOULD_BLOCK;
Simon Cooksey 0:fb7af294d5d9 85 break;
Simon Cooksey 0:fb7af294d5d9 86 }
Simon Cooksey 0:fb7af294d5d9 87 }
Simon Cooksey 0:fb7af294d5d9 88 }
Simon Cooksey 0:fb7af294d5d9 89
Simon Cooksey 0:fb7af294d5d9 90 _write_in_progress = false;
Simon Cooksey 0:fb7af294d5d9 91 _lock.unlock();
Simon Cooksey 0:fb7af294d5d9 92 return ret;
Simon Cooksey 0:fb7af294d5d9 93 }
Simon Cooksey 0:fb7af294d5d9 94
Simon Cooksey 0:fb7af294d5d9 95 int UDPSocket::recvfrom(SocketAddress *address, void *buffer, unsigned size)
Simon Cooksey 0:fb7af294d5d9 96 {
Simon Cooksey 0:fb7af294d5d9 97 _lock.lock();
Simon Cooksey 0:fb7af294d5d9 98 int ret;
Simon Cooksey 0:fb7af294d5d9 99
Simon Cooksey 0:fb7af294d5d9 100 // If this assert is hit then there are two threads
Simon Cooksey 0:fb7af294d5d9 101 // performing a recv at the same time which is undefined
Simon Cooksey 0:fb7af294d5d9 102 // behavior
Simon Cooksey 0:fb7af294d5d9 103 MBED_ASSERT(!_read_in_progress);
Simon Cooksey 0:fb7af294d5d9 104 _read_in_progress = true;
Simon Cooksey 0:fb7af294d5d9 105
Simon Cooksey 0:fb7af294d5d9 106 while (true) {
Simon Cooksey 0:fb7af294d5d9 107 if (!_socket) {
Simon Cooksey 0:fb7af294d5d9 108 ret = NSAPI_ERROR_NO_SOCKET;
Simon Cooksey 0:fb7af294d5d9 109 break;
Simon Cooksey 0:fb7af294d5d9 110 }
Simon Cooksey 0:fb7af294d5d9 111
Simon Cooksey 0:fb7af294d5d9 112 _pending = 0;
Simon Cooksey 0:fb7af294d5d9 113 int recv = _stack->socket_recvfrom(_socket, address, buffer, size);
Simon Cooksey 0:fb7af294d5d9 114 if ((0 == _timeout) || (NSAPI_ERROR_WOULD_BLOCK != recv)) {
Simon Cooksey 0:fb7af294d5d9 115 ret = recv;
Simon Cooksey 0:fb7af294d5d9 116 break;
Simon Cooksey 0:fb7af294d5d9 117 } else {
Simon Cooksey 0:fb7af294d5d9 118 int32_t count;
Simon Cooksey 0:fb7af294d5d9 119
Simon Cooksey 0:fb7af294d5d9 120 // Release lock before blocking so other threads
Simon Cooksey 0:fb7af294d5d9 121 // accessing this object aren't blocked
Simon Cooksey 0:fb7af294d5d9 122 _lock.unlock();
Simon Cooksey 0:fb7af294d5d9 123 count = _read_sem.wait(_timeout);
Simon Cooksey 0:fb7af294d5d9 124 _lock.lock();
Simon Cooksey 0:fb7af294d5d9 125
Simon Cooksey 0:fb7af294d5d9 126 if (count < 1) {
Simon Cooksey 0:fb7af294d5d9 127 // Semaphore wait timed out so break out and return
Simon Cooksey 0:fb7af294d5d9 128 ret = NSAPI_ERROR_WOULD_BLOCK;
Simon Cooksey 0:fb7af294d5d9 129 break;
Simon Cooksey 0:fb7af294d5d9 130 }
Simon Cooksey 0:fb7af294d5d9 131 }
Simon Cooksey 0:fb7af294d5d9 132 }
Simon Cooksey 0:fb7af294d5d9 133
Simon Cooksey 0:fb7af294d5d9 134 _read_in_progress = false;
Simon Cooksey 0:fb7af294d5d9 135 _lock.unlock();
Simon Cooksey 0:fb7af294d5d9 136 return ret;
Simon Cooksey 0:fb7af294d5d9 137 }
Simon Cooksey 0:fb7af294d5d9 138
Simon Cooksey 0:fb7af294d5d9 139 void UDPSocket::event()
Simon Cooksey 0:fb7af294d5d9 140 {
Simon Cooksey 0:fb7af294d5d9 141 int32_t wcount = _write_sem.wait(0);
Simon Cooksey 0:fb7af294d5d9 142 if (wcount <= 1) {
Simon Cooksey 0:fb7af294d5d9 143 _write_sem.release();
Simon Cooksey 0:fb7af294d5d9 144 }
Simon Cooksey 0:fb7af294d5d9 145 int32_t rcount = _read_sem.wait(0);
Simon Cooksey 0:fb7af294d5d9 146 if (rcount <= 1) {
Simon Cooksey 0:fb7af294d5d9 147 _read_sem.release();
Simon Cooksey 0:fb7af294d5d9 148 }
Simon Cooksey 0:fb7af294d5d9 149
Simon Cooksey 0:fb7af294d5d9 150 _pending += 1;
Simon Cooksey 0:fb7af294d5d9 151 if (_callback && _pending == 1) {
Simon Cooksey 0:fb7af294d5d9 152 _callback();
Simon Cooksey 0:fb7af294d5d9 153 }
Simon Cooksey 0:fb7af294d5d9 154 }