Diff: mbed-os/features/netsocket/TCPServer.cpp

Revision:

0:9b3d4731edbb

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os/features/netsocket/TCPServer.cpp	Thu Jun 21 13:51:43 2018 +0000
@@ -0,0 +1,113 @@
+/* Socket
+ * Copyright (c) 2015 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "TCPServer.h"
+#include "mbed.h"
+
+TCPServer::TCPServer()
+    : _pending(0), _accept_sem(0)
+{
+}
+
+TCPServer::~TCPServer()
+{
+    close();
+}
+
+nsapi_protocol_t TCPServer::get_proto()
+{
+    return NSAPI_TCP;
+}
+
+nsapi_error_t TCPServer::listen(int backlog)
+{
+    _lock.lock();
+    nsapi_error_t ret;
+
+    if (!_socket) {
+        ret = NSAPI_ERROR_NO_SOCKET;
+    } else {
+        ret = _stack->socket_listen(_socket, backlog);
+    }
+
+    _lock.unlock();
+    return ret;
+}
+
+nsapi_error_t TCPServer::accept(TCPSocket *connection, SocketAddress *address)
+{
+    _lock.lock();
+    nsapi_error_t ret;
+
+    while (true) {
+        if (!_socket) {
+            ret = NSAPI_ERROR_NO_SOCKET;
+            break;
+        } 
+
+        _pending = 0;
+        void *socket;
+        ret = _stack->socket_accept(_socket, &socket, address);
+
+        if (0 == ret) {
+            connection->_lock.lock();
+
+            if (connection->_socket) {
+                connection->close();
+            }
+
+            connection->_stack = _stack;
+            connection->_socket = socket;
+            connection->_event = Callback<void()>(connection, &TCPSocket::event);
+            _stack->socket_attach(socket, &Callback<void()>::thunk, &connection->_event);
+
+            connection->_lock.unlock();
+            break;
+        } else if (NSAPI_ERROR_WOULD_BLOCK != ret) {
+            break;
+        } else {
+            int32_t count;
+
+            // Release lock before blocking so other threads
+            // accessing this object aren't blocked
+            _lock.unlock();
+            count = _accept_sem.wait(_timeout);
+            _lock.lock();
+
+            if (count < 1) {
+                // Semaphore wait timed out so break out and return
+                ret = NSAPI_ERROR_WOULD_BLOCK;
+                break;
+            }
+        }
+    }
+
+    _lock.unlock();
+    return ret;
+}
+
+void TCPServer::event()
+{
+    int32_t acount = _accept_sem.wait(0);
+    if (acount <= 1) {
+        _accept_sem.release();
+    }
+
+    _pending += 1;
+    if (_callback && _pending == 1) {
+        _callback();
+    }
+}