Simon Cooksey / mbed-os

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features/netsocket/TCPSocket.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 "TCPSocket.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 TCPSocket::TCPSocket()
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 TCPSocket::~TCPSocket()
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 TCPSocket::get_proto()
Simon Cooksey 0:fb7af294d5d9 33 {
Simon Cooksey 0:fb7af294d5d9 34 return NSAPI_TCP;
Simon Cooksey 0:fb7af294d5d9 35 }
Simon Cooksey 0:fb7af294d5d9 36
Simon Cooksey 0:fb7af294d5d9 37 int TCPSocket::connect(const SocketAddress &address)
Simon Cooksey 0:fb7af294d5d9 38 {
Simon Cooksey 0:fb7af294d5d9 39 _lock.lock();
Simon Cooksey 0:fb7af294d5d9 40 int ret;
Simon Cooksey 0:fb7af294d5d9 41
Simon Cooksey 0:fb7af294d5d9 42 if (!_socket) {
Simon Cooksey 0:fb7af294d5d9 43 ret = NSAPI_ERROR_NO_SOCKET;
Simon Cooksey 0:fb7af294d5d9 44 } else {
Simon Cooksey 0:fb7af294d5d9 45 ret = _stack->socket_connect(_socket, address);
Simon Cooksey 0:fb7af294d5d9 46 }
Simon Cooksey 0:fb7af294d5d9 47
Simon Cooksey 0:fb7af294d5d9 48 _lock.unlock();
Simon Cooksey 0:fb7af294d5d9 49 return ret;
Simon Cooksey 0:fb7af294d5d9 50 }
Simon Cooksey 0:fb7af294d5d9 51
Simon Cooksey 0:fb7af294d5d9 52 int TCPSocket::connect(const char *host, uint16_t port)
Simon Cooksey 0:fb7af294d5d9 53 {
Simon Cooksey 0:fb7af294d5d9 54 SocketAddress address;
Simon Cooksey 0:fb7af294d5d9 55 int err = _stack->gethostbyname(host, &address);
Simon Cooksey 0:fb7af294d5d9 56 if (err) {
Simon Cooksey 0:fb7af294d5d9 57 return NSAPI_ERROR_DNS_FAILURE;
Simon Cooksey 0:fb7af294d5d9 58 }
Simon Cooksey 0:fb7af294d5d9 59
Simon Cooksey 0:fb7af294d5d9 60 address.set_port(port);
Simon Cooksey 0:fb7af294d5d9 61
Simon Cooksey 0:fb7af294d5d9 62 // connect is thread safe
Simon Cooksey 0:fb7af294d5d9 63 return connect(address);
Simon Cooksey 0:fb7af294d5d9 64 }
Simon Cooksey 0:fb7af294d5d9 65
Simon Cooksey 0:fb7af294d5d9 66 int TCPSocket::send(const void *data, unsigned size)
Simon Cooksey 0:fb7af294d5d9 67 {
Simon Cooksey 0:fb7af294d5d9 68 _lock.lock();
Simon Cooksey 0:fb7af294d5d9 69 int ret;
Simon Cooksey 0:fb7af294d5d9 70
Simon Cooksey 0:fb7af294d5d9 71 // If this assert is hit then there are two threads
Simon Cooksey 0:fb7af294d5d9 72 // performing a send at the same time which is undefined
Simon Cooksey 0:fb7af294d5d9 73 // behavior
Simon Cooksey 0:fb7af294d5d9 74 MBED_ASSERT(!_write_in_progress);
Simon Cooksey 0:fb7af294d5d9 75 _write_in_progress = true;
Simon Cooksey 0:fb7af294d5d9 76
Simon Cooksey 0:fb7af294d5d9 77 while (true) {
Simon Cooksey 0:fb7af294d5d9 78 if (!_socket) {
Simon Cooksey 0:fb7af294d5d9 79 ret = NSAPI_ERROR_NO_SOCKET;
Simon Cooksey 0:fb7af294d5d9 80 break;
Simon Cooksey 0:fb7af294d5d9 81 }
Simon Cooksey 0:fb7af294d5d9 82
Simon Cooksey 0:fb7af294d5d9 83 _pending = 0;
Simon Cooksey 0:fb7af294d5d9 84 int sent = _stack->socket_send(_socket, data, size);
Simon Cooksey 0:fb7af294d5d9 85 if ((0 == _timeout) || (NSAPI_ERROR_WOULD_BLOCK != sent)) {
Simon Cooksey 0:fb7af294d5d9 86 ret = sent;
Simon Cooksey 0:fb7af294d5d9 87 break;
Simon Cooksey 0:fb7af294d5d9 88 } else {
Simon Cooksey 0:fb7af294d5d9 89 int32_t count;
Simon Cooksey 0:fb7af294d5d9 90
Simon Cooksey 0:fb7af294d5d9 91 // Release lock before blocking so other threads
Simon Cooksey 0:fb7af294d5d9 92 // accessing this object aren't blocked
Simon Cooksey 0:fb7af294d5d9 93 _lock.unlock();
Simon Cooksey 0:fb7af294d5d9 94 count = _write_sem.wait(_timeout);
Simon Cooksey 0:fb7af294d5d9 95 _lock.lock();
Simon Cooksey 0:fb7af294d5d9 96
Simon Cooksey 0:fb7af294d5d9 97 if (count < 1) {
Simon Cooksey 0:fb7af294d5d9 98 // Semaphore wait timed out so break out and return
Simon Cooksey 0:fb7af294d5d9 99 ret = NSAPI_ERROR_WOULD_BLOCK;
Simon Cooksey 0:fb7af294d5d9 100 break;
Simon Cooksey 0:fb7af294d5d9 101 }
Simon Cooksey 0:fb7af294d5d9 102 }
Simon Cooksey 0:fb7af294d5d9 103 }
Simon Cooksey 0:fb7af294d5d9 104
Simon Cooksey 0:fb7af294d5d9 105 _write_in_progress = false;
Simon Cooksey 0:fb7af294d5d9 106 _lock.unlock();
Simon Cooksey 0:fb7af294d5d9 107 return ret;
Simon Cooksey 0:fb7af294d5d9 108 }
Simon Cooksey 0:fb7af294d5d9 109
Simon Cooksey 0:fb7af294d5d9 110 int TCPSocket::recv(void *data, unsigned size)
Simon Cooksey 0:fb7af294d5d9 111 {
Simon Cooksey 0:fb7af294d5d9 112 _lock.lock();
Simon Cooksey 0:fb7af294d5d9 113 int ret;
Simon Cooksey 0:fb7af294d5d9 114
Simon Cooksey 0:fb7af294d5d9 115 // If this assert is hit then there are two threads
Simon Cooksey 0:fb7af294d5d9 116 // performing a recv at the same time which is undefined
Simon Cooksey 0:fb7af294d5d9 117 // behavior
Simon Cooksey 0:fb7af294d5d9 118 MBED_ASSERT(!_read_in_progress);
Simon Cooksey 0:fb7af294d5d9 119 _read_in_progress = true;
Simon Cooksey 0:fb7af294d5d9 120
Simon Cooksey 0:fb7af294d5d9 121 while (true) {
Simon Cooksey 0:fb7af294d5d9 122 if (!_socket) {
Simon Cooksey 0:fb7af294d5d9 123 ret = NSAPI_ERROR_NO_SOCKET;
Simon Cooksey 0:fb7af294d5d9 124 break;
Simon Cooksey 0:fb7af294d5d9 125 }
Simon Cooksey 0:fb7af294d5d9 126
Simon Cooksey 0:fb7af294d5d9 127 _pending = 0;
Simon Cooksey 0:fb7af294d5d9 128 int recv = _stack->socket_recv(_socket, data, size);
Simon Cooksey 0:fb7af294d5d9 129 if ((0 == _timeout) || (NSAPI_ERROR_WOULD_BLOCK != recv)) {
Simon Cooksey 0:fb7af294d5d9 130 ret = recv;
Simon Cooksey 0:fb7af294d5d9 131 break;
Simon Cooksey 0:fb7af294d5d9 132 } else {
Simon Cooksey 0:fb7af294d5d9 133 int32_t count;
Simon Cooksey 0:fb7af294d5d9 134
Simon Cooksey 0:fb7af294d5d9 135 // Release lock before blocking so other threads
Simon Cooksey 0:fb7af294d5d9 136 // accessing this object aren't blocked
Simon Cooksey 0:fb7af294d5d9 137 _lock.unlock();
Simon Cooksey 0:fb7af294d5d9 138 count = _read_sem.wait(_timeout);
Simon Cooksey 0:fb7af294d5d9 139 _lock.lock();
Simon Cooksey 0:fb7af294d5d9 140
Simon Cooksey 0:fb7af294d5d9 141 if (count < 1) {
Simon Cooksey 0:fb7af294d5d9 142 // Semaphore wait timed out so break out and return
Simon Cooksey 0:fb7af294d5d9 143 ret = NSAPI_ERROR_WOULD_BLOCK;
Simon Cooksey 0:fb7af294d5d9 144 break;
Simon Cooksey 0:fb7af294d5d9 145 }
Simon Cooksey 0:fb7af294d5d9 146 }
Simon Cooksey 0:fb7af294d5d9 147 }
Simon Cooksey 0:fb7af294d5d9 148
Simon Cooksey 0:fb7af294d5d9 149 _read_in_progress = false;
Simon Cooksey 0:fb7af294d5d9 150 _lock.unlock();
Simon Cooksey 0:fb7af294d5d9 151 return ret;
Simon Cooksey 0:fb7af294d5d9 152 }
Simon Cooksey 0:fb7af294d5d9 153
Simon Cooksey 0:fb7af294d5d9 154 void TCPSocket::event()
Simon Cooksey 0:fb7af294d5d9 155 {
Simon Cooksey 0:fb7af294d5d9 156 int32_t wcount = _write_sem.wait(0);
Simon Cooksey 0:fb7af294d5d9 157 if (wcount <= 1) {
Simon Cooksey 0:fb7af294d5d9 158 _write_sem.release();
Simon Cooksey 0:fb7af294d5d9 159 }
Simon Cooksey 0:fb7af294d5d9 160 int32_t rcount = _read_sem.wait(0);
Simon Cooksey 0:fb7af294d5d9 161 if (rcount <= 1) {
Simon Cooksey 0:fb7af294d5d9 162 _read_sem.release();
Simon Cooksey 0:fb7af294d5d9 163 }
Simon Cooksey 0:fb7af294d5d9 164
Simon Cooksey 0:fb7af294d5d9 165 _pending += 1;
Simon Cooksey 0:fb7af294d5d9 166 if (_callback && _pending == 1) {
Simon Cooksey 0:fb7af294d5d9 167 _callback();
Simon Cooksey 0:fb7af294d5d9 168 }
Simon Cooksey 0:fb7af294d5d9 169 }