2 Copyright (C) 2009 Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 CrossThreadChannel::CrossThreadChannel (bool non_blocking)
30 if(WSAStartup(MAKEWORD(1,1),&wsaData) != 0) {
31 std::cerr << "CrossThreadChannel::CrossThreadChannel() Winsock initialization failed with error: " << WSAGetLastError() << std::endl;
35 struct sockaddr_in send_address;
38 send_socket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
39 send_address.sin_family = AF_INET;
40 send_address.sin_addr.s_addr = inet_addr("127.0.0.1");
41 send_address.sin_port = htons(0);
42 int status = bind(send_socket, (SOCKADDR*)&send_address,
43 sizeof(send_address));
46 std::cerr << "CrossThreadChannel::CrossThreadChannel() Send socket binding failed with error: " << WSAGetLastError() << std::endl;
50 // make the socket non-blockable if required
51 u_long mode = (u_long)non_blocking;
54 otp_result = ioctlsocket(send_socket, FIONBIO, &mode);
55 if (otp_result != NO_ERROR) {
56 std::cerr << "CrossThreadChannel::CrossThreadChannel() Send socket cannot be set to non blocking mode with error: " << WSAGetLastError() << std::endl;
59 // Create Receive Socket, this socket will be set to unblockable mode by IO channel
60 receive_socket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
61 recv_address.sin_family = AF_INET;
62 recv_address.sin_addr.s_addr = inet_addr("127.0.0.1");
63 recv_address.sin_port = htons(0);
64 status = bind(receive_socket, (SOCKADDR*)&recv_address,
65 sizeof(recv_address));
68 std::cerr << "CrossThreadChannel::CrossThreadChannel() Receive socket binding failed with error: " << WSAGetLastError() << std::endl;
72 // recieve socket will be made non-blocking by GSource which will use it
74 // get assigned port number for Receive Socket
75 int recv_addr_len = sizeof(recv_address);
76 status = getsockname(receive_socket, (SOCKADDR*)&recv_address, &recv_addr_len);
79 std::cerr << "CrossThreadChannel::CrossThreadChannel() Setting receive socket address to local failed with error: " << WSAGetLastError() << std::endl;
83 // construct IOChannel
84 receive_channel = g_io_channel_win32_new_socket((gint)receive_socket);
86 // set binary data type
87 GIOStatus g_status = g_io_channel_set_encoding (receive_channel, NULL, NULL);
88 if (G_IO_STATUS_NORMAL != g_status ) {
89 std::cerr << "CrossThreadChannel::CrossThreadChannel() Cannot set flag for IOChannel. " << g_status << std::endl;
93 // disable channel buffering
94 g_io_channel_set_buffered (receive_channel, false);
97 CrossThreadChannel::~CrossThreadChannel ()
101 if (receive_channel) {
102 g_io_channel_unref (receive_channel);
105 closesocket(send_socket);
106 closesocket(receive_socket);
111 CrossThreadChannel::wakeup ()
115 // write one byte to wake up a thread which is listening our IOS
116 sendto(send_socket, &c, sizeof(c), 0, (SOCKADDR*)&recv_address, sizeof(recv_address) );
120 CrossThreadChannel::drain ()
122 /* flush the buffer - empty the channel from all requests */
128 GIOStatus g_status = g_io_channel_read_chars (receive_channel, buffer, sizeof(buffer), &read, &g_error);
130 if (G_IO_STATUS_AGAIN == g_status) {
134 if (G_IO_STATUS_NORMAL != g_status) {
135 std::cerr << "CrossThreadChannel::CrossThreadChannel() Cannot drain from read buffer! " << g_status << std::endl;
138 std::cerr << "Error is Domain: " << g_error->domain << " Code: " << g_error->code << std::endl;
139 g_clear_error(&g_error);
141 std::cerr << "No error provided\n";
150 CrossThreadChannel::deliver (char msg)
153 // write one particular byte to wake up the thread which is listening our IOS
154 int status = sendto(send_socket, &msg, sizeof(msg), 0, (SOCKADDR*)&recv_address, sizeof(recv_address) );
156 if (SOCKET_ERROR == status) {
164 CrossThreadChannel::receive (char& msg)
169 // fetch the message from the channel.
170 GIOStatus g_status = g_io_channel_read_chars (receive_channel, &msg, sizeof(msg), &read, &g_error);
172 if (G_IO_STATUS_NORMAL != g_status) {