Rahul Dahiya / Mbed OS STM32F7 Ethernet

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mbed-os/features/netsocket/TCPServer.cpp@0:fb8047b156bb, 2020-01-15 (annotated)

Committer:
rahul_dahiya
Date:
Wed Jan 15 15:57:15 2020 +0530
Revision:
0:fb8047b156bb
STM32F7 LWIP

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rahul_dahiya 0:fb8047b156bb 1 /* Socket
rahul_dahiya 0:fb8047b156bb 2 * Copyright (c) 2015 ARM Limited
rahul_dahiya 0:fb8047b156bb 3 *
rahul_dahiya 0:fb8047b156bb 4 * Licensed under the Apache License, Version 2.0 (the "License");
rahul_dahiya 0:fb8047b156bb 5 * you may not use this file except in compliance with the License.
rahul_dahiya 0:fb8047b156bb 6 * You may obtain a copy of the License at
rahul_dahiya 0:fb8047b156bb 7 *
rahul_dahiya 0:fb8047b156bb 8 * http://www.apache.org/licenses/LICENSE-2.0
rahul_dahiya 0:fb8047b156bb 9 *
rahul_dahiya 0:fb8047b156bb 10 * Unless required by applicable law or agreed to in writing, software
rahul_dahiya 0:fb8047b156bb 11 * distributed under the License is distributed on an "AS IS" BASIS,
rahul_dahiya 0:fb8047b156bb 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
rahul_dahiya 0:fb8047b156bb 13 * See the License for the specific language governing permissions and
rahul_dahiya 0:fb8047b156bb 14 * limitations under the License.
rahul_dahiya 0:fb8047b156bb 15 */
rahul_dahiya 0:fb8047b156bb 16
rahul_dahiya 0:fb8047b156bb 17 #include "TCPServer.h"
rahul_dahiya 0:fb8047b156bb 18 #include "mbed.h"
rahul_dahiya 0:fb8047b156bb 19
rahul_dahiya 0:fb8047b156bb 20 TCPServer::TCPServer()
rahul_dahiya 0:fb8047b156bb 21 : _pending(0), _accept_sem(0)
rahul_dahiya 0:fb8047b156bb 22 {
rahul_dahiya 0:fb8047b156bb 23 }
rahul_dahiya 0:fb8047b156bb 24
rahul_dahiya 0:fb8047b156bb 25 TCPServer::~TCPServer()
rahul_dahiya 0:fb8047b156bb 26 {
rahul_dahiya 0:fb8047b156bb 27 close();
rahul_dahiya 0:fb8047b156bb 28 }
rahul_dahiya 0:fb8047b156bb 29
rahul_dahiya 0:fb8047b156bb 30 nsapi_protocol_t TCPServer::get_proto()
rahul_dahiya 0:fb8047b156bb 31 {
rahul_dahiya 0:fb8047b156bb 32 return NSAPI_TCP;
rahul_dahiya 0:fb8047b156bb 33 }
rahul_dahiya 0:fb8047b156bb 34
rahul_dahiya 0:fb8047b156bb 35 nsapi_error_t TCPServer::listen(int backlog)
rahul_dahiya 0:fb8047b156bb 36 {
rahul_dahiya 0:fb8047b156bb 37 _lock.lock();
rahul_dahiya 0:fb8047b156bb 38 nsapi_error_t ret;
rahul_dahiya 0:fb8047b156bb 39
rahul_dahiya 0:fb8047b156bb 40 if (!_socket) {
rahul_dahiya 0:fb8047b156bb 41 ret = NSAPI_ERROR_NO_SOCKET;
rahul_dahiya 0:fb8047b156bb 42 } else {
rahul_dahiya 0:fb8047b156bb 43 ret = _stack->socket_listen(_socket, backlog);
rahul_dahiya 0:fb8047b156bb 44 }
rahul_dahiya 0:fb8047b156bb 45
rahul_dahiya 0:fb8047b156bb 46 _lock.unlock();
rahul_dahiya 0:fb8047b156bb 47 return ret;
rahul_dahiya 0:fb8047b156bb 48 }
rahul_dahiya 0:fb8047b156bb 49
rahul_dahiya 0:fb8047b156bb 50 nsapi_error_t TCPServer::accept(TCPSocket *connection, SocketAddress *address)
rahul_dahiya 0:fb8047b156bb 51 {
rahul_dahiya 0:fb8047b156bb 52 _lock.lock();
rahul_dahiya 0:fb8047b156bb 53 nsapi_error_t ret;
rahul_dahiya 0:fb8047b156bb 54
rahul_dahiya 0:fb8047b156bb 55 while (true) {
rahul_dahiya 0:fb8047b156bb 56 if (!_socket) {
rahul_dahiya 0:fb8047b156bb 57 ret = NSAPI_ERROR_NO_SOCKET;
rahul_dahiya 0:fb8047b156bb 58 break;
rahul_dahiya 0:fb8047b156bb 59 }
rahul_dahiya 0:fb8047b156bb 60
rahul_dahiya 0:fb8047b156bb 61 _pending = 0;
rahul_dahiya 0:fb8047b156bb 62 void *socket;
rahul_dahiya 0:fb8047b156bb 63 ret = _stack->socket_accept(_socket, &socket, address);
rahul_dahiya 0:fb8047b156bb 64
rahul_dahiya 0:fb8047b156bb 65 if (0 == ret) {
rahul_dahiya 0:fb8047b156bb 66 connection->_lock.lock();
rahul_dahiya 0:fb8047b156bb 67
rahul_dahiya 0:fb8047b156bb 68 if (connection->_socket) {
rahul_dahiya 0:fb8047b156bb 69 connection->close();
rahul_dahiya 0:fb8047b156bb 70 }
rahul_dahiya 0:fb8047b156bb 71
rahul_dahiya 0:fb8047b156bb 72 connection->_stack = _stack;
rahul_dahiya 0:fb8047b156bb 73 connection->_socket = socket;
rahul_dahiya 0:fb8047b156bb 74 connection->_event = Callback<void()>(connection, &TCPSocket::event);
rahul_dahiya 0:fb8047b156bb 75 _stack->socket_attach(socket, &Callback<void()>::thunk, &connection->_event);
rahul_dahiya 0:fb8047b156bb 76
rahul_dahiya 0:fb8047b156bb 77 connection->_lock.unlock();
rahul_dahiya 0:fb8047b156bb 78 break;
rahul_dahiya 0:fb8047b156bb 79 } else if (NSAPI_ERROR_WOULD_BLOCK != ret) {
rahul_dahiya 0:fb8047b156bb 80 break;
rahul_dahiya 0:fb8047b156bb 81 } else {
rahul_dahiya 0:fb8047b156bb 82 int32_t count;
rahul_dahiya 0:fb8047b156bb 83
rahul_dahiya 0:fb8047b156bb 84 // Release lock before blocking so other threads
rahul_dahiya 0:fb8047b156bb 85 // accessing this object aren't blocked
rahul_dahiya 0:fb8047b156bb 86 _lock.unlock();
rahul_dahiya 0:fb8047b156bb 87 count = _accept_sem.wait(_timeout);
rahul_dahiya 0:fb8047b156bb 88 _lock.lock();
rahul_dahiya 0:fb8047b156bb 89
rahul_dahiya 0:fb8047b156bb 90 if (count < 1) {
rahul_dahiya 0:fb8047b156bb 91 // Semaphore wait timed out so break out and return
rahul_dahiya 0:fb8047b156bb 92 ret = NSAPI_ERROR_WOULD_BLOCK;
rahul_dahiya 0:fb8047b156bb 93 break;
rahul_dahiya 0:fb8047b156bb 94 }
rahul_dahiya 0:fb8047b156bb 95 }
rahul_dahiya 0:fb8047b156bb 96 }
rahul_dahiya 0:fb8047b156bb 97
rahul_dahiya 0:fb8047b156bb 98 _lock.unlock();
rahul_dahiya 0:fb8047b156bb 99 return ret;
rahul_dahiya 0:fb8047b156bb 100 }
rahul_dahiya 0:fb8047b156bb 101
rahul_dahiya 0:fb8047b156bb 102 void TCPServer::event()
rahul_dahiya 0:fb8047b156bb 103 {
rahul_dahiya 0:fb8047b156bb 104 int32_t acount = _accept_sem.wait(0);
rahul_dahiya 0:fb8047b156bb 105 if (acount <= 1) {
rahul_dahiya 0:fb8047b156bb 106 _accept_sem.release();
rahul_dahiya 0:fb8047b156bb 107 }
rahul_dahiya 0:fb8047b156bb 108
rahul_dahiya 0:fb8047b156bb 109 _pending += 1;
rahul_dahiya 0:fb8047b156bb 110 if (_callback && _pending == 1) {
rahul_dahiya 0:fb8047b156bb 111 _callback();
rahul_dahiya 0:fb8047b156bb 112 }
rahul_dahiya 0:fb8047b156bb 113 }