CN103841148A - Master-slave communication method and system adopting reliable and unreliable networks in monitoring program - Google Patents
Master-slave communication method and system adopting reliable and unreliable networks in monitoring program Download PDFInfo
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Abstract
The invention discloses a master-slave communication method and system adopting reliable and unreliable networks in a monitoring program. The method comprises the following steps: a communication thread is established for the monitoring program, and sockets of the communication thread and message types corresponding to the sockets are set, wherein the message types comprise a message type based on the TCP reliable network protocol and a message type based on the UDP unreliable network protocol; the IP address of a target board is bound with the port of each socket; the operating state of each socket is polled, and when the ports of the sockets are detected to be ready, data is read from the ports of the sockets to acquire an application layer data packet; and the application layer data packet is processed, and the processing result is written into the descriptors of the sockets for information interaction. By adopting the method and the system of the invention, the communication reliability can be ensured, and at the same time, a network interface communication mode except the conventional serial port mode is provided for a monitoring system to improve the network communication efficiency.
Description
Technical field
The present invention relates to the network communications technology, particularly relate to the master-slave communication method and system of utilizing reliable and unreliable network in monitoring program.
Background technology
At present, DPD(Digital Pre-Distortion, digital pre-distortion) power amplifier moves in engineering, must keep the power amplifier can be normal with main-machine communication, could play control to power amplifier like this, and then play the Center by OMC(Operations & Maintenance, operation maintenance center) monitor the object of long-range slave.If adopt traditional RS485 serial communication mode, be limited on the one hand speed, to be the time-consuming work of effort again if download monitoring program, on the other hand, along with monitoring content increases, monitoring objective code increases gradually, for guaranteeing communication quality, reliability requirement is also more and more higher, utilizes the conventional art of serial ports to be improved and to improve.
Along with the development of Internet technology, the tcp/ip communication technology based on network interface is more and more ripe at present.In order to improve the restriction of serial ports to speed bottle-neck in communication process, effectively improve throughput and the robustness of communication task, be necessary to introduce TCP/IP technology in supervisory control system.
But generally all larger data traffic is processed in the network service based on network interface, adopt general server/client structure to bring unnecessary burden to system monitoring task, hinder the raising of communication efficiency.
Summary of the invention
Based on this, be necessary for the problems referred to above, the master-slave communication method and system of utilizing reliable and unreliable network in a kind of monitoring program are provided, when can guaranteeing communication reliability, improve the efficiency of communication.
A master-slave communication method of utilizing reliable and unreliable network in monitoring program, comprising:
For monitoring program builds communication thread, the socket of described communication thread and the type of message corresponding with this socket are set, wherein, described type of message comprises type of message based on TCP reliable network agreement and the type of message based on UDP unreliable network agreement;
The IP address of Target Board and the port of each socket are bound;
The mode of operation of each socket of poll, in the time that the port that socket detected is ready, fetches data from the port reads of this socket, obtains application layer data bag;
Process this application layer data bag, and the result of processing is write in the descriptor of this socket and carry out information interaction.
Correspondingly, in a kind of monitoring program, utilize the master-slave communication system of reliable and unreliable network, comprising:
Threading building module, be used to monitoring program to build communication thread, the socket of described communication thread and the type of message corresponding with this socket are set, wherein, described type of message comprises type of message based on TCP reliable network agreement and the type of message based on UDP unreliable network agreement;
The port binding module being connected with described threading building module, for binding the IP address of Target Board and the port of each socket;
The port polling module being connected with described port binding module, for the mode of operation of each socket of poll;
The port read module being connected with described port polling module, in the time that the port that socket detected is ready, fetches data from the port reads of this socket, obtains application layer data bag;
The port writing module being connected with described port polling module, for processing after this application layer data bag, writes the result of processing in the descriptor of this socket and carries out information interaction.
Implement the present invention, there is following beneficial effect:
The present invention is that monitoring program builds communication thread, is provided with the socket based on Transmission Control Protocol and the socket based on udp protocol, has improved the reliability of communication task in supervisory control system.Realize by serial ports RS485 with respect to existing system communication, because the communication mode agreement of serial ports is simple, and on link, there is no a complexity verifying function accurately, the present invention utilizes communication that network interface carries out to be based upon on reliable ICP/IP protocol basis to carry out, no matter be connection-oriented Transmission Control Protocol or user datagram udp protocol, can both reduce the probability that data are made mistakes in transmitting procedure.In addition, the serial communication mode that data transmission efficiency of the present invention is more traditional is greatly improved, communication mode peak transfer rate based on serial ports only has 11Kbyte/s, and hardware is hundred Broadcoms under this monitor supervision platform, transmission rate is ideally 10Mbyte/s, and speed has promoted about 1000 times.
Accompanying drawing explanation
Fig. 1 is the flow chart that utilizes the master-slave communication method of reliable and unreliable network in monitoring program of the present invention;
Fig. 2 is the embodiment schematic diagram that utilizes the master-slave communication method of reliable and unreliable network in monitoring program of the present invention;
Fig. 3 is the embodiment flow chart that utilizes the master-slave communication method of reliable and unreliable network in monitoring program of the present invention;
Fig. 4 is the schematic diagram that utilizes the master-slave communication system of reliable and unreliable network in monitoring program of the present invention;
Fig. 5 is the embodiment schematic diagram that utilizes the master-slave communication system of reliable and unreliable network in monitoring program of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail.
Fig. 1 is the flow chart that utilizes the master-slave communication method of reliable and unreliable network in monitoring program of the present invention, comprising:
S101: for monitoring program builds communication thread, the socket of described communication thread and the type of message corresponding with this socket are set.Wherein, described type of message comprises type of message based on TCP reliable network agreement and the type of message based on UDP unreliable network agreement;
S102: the IP address of Target Board and the port of each socket are bound;
S103: the mode of operation of each socket of poll, in the time that the port that socket detected is ready, fetch data from the port reads of this socket, obtain application layer data bag;
S104: process this application layer data bag, and the result of processing is write in the descriptor of this socket and carry out information interaction.
The present invention is that monitoring program builds communication thread, and is these communication thread setting at least two class sockets, and a class is the socket of the type of message based on TCP reliable network agreement, hereinafter to be referred as TCP socket; An other class is the socket of the type of message based on UDP unreliable network agreement, hereinafter to be referred as UDP socket.Because the communication that utilizes network interface to carry out is to be based upon on the basis of reliable TCP/IP technology to carry out, no matter be connection-oriented Transmission Control Protocol or user datagram udp protocol, can both reduce the probability that data are made mistakes in transmitting procedure.Than the serial communication mode that there is no verifying function in conventional art, the present invention can improve the reliability of communication task.
Except the above-mentioned software protocol that utilizes improves communication reliability, from combined with hardware efficiency, after os starting, the IP address of number of targets letter stencil network interface card is set to the pre-stored IP address at configuration file, this IP address be artificial arrange so that Target Board and graphic user interface (GUI) with or distance host communicate by letter.When monitoring program creates after communication service thread, the socket of communication service thread and this IP address are bound together by calling bind system function, classification through ICP/IP protocol to data, communication thread only need to be processed the data that arrive bound socket, and the communication service thread of for example this monitoring program only accepts to bind the data of TCP socket port and the data of UDP socket port.Under this monitor supervision platform, hardware is hundred Broadcoms, and transmission rate is ideally 10Mbyte/s, data transmission bauds than serial communication improved efficiency about 1000 times.
Fig. 2 is the embodiment schematic diagram that utilizes the master-slave communication method of reliable and unreliable network in monitoring program of the present invention.As shown in Figure 2, it is no longer the man-to-man connection of traditional serial mode, but the connected mode of one-to-many, communication service thread (server) is connected with multiple external programs (GUI/OMC/OMT).Also be readset by the readset(of poll socket), detect the communication connection of the mould tune instrument of multiple human-computer interaction interface software or network management center at synchronization.
It should be added that, although external program (GUI/OMC/OMT) has multiple, as Fig. 2 given example has five (GUI_1 to GUI_5), but, this communication task only has a thread, this communication service thread adopts the strategy of multiplexed port, does not increase sub-thread, reduces the expense that communication task is brought to whole system as far as possible.In the time that the port that socket detected is ready, fetch data from the port reads of this socket, obtain application layer data bag.Process this application layer data bag, and the result of processing is write in the descriptor of this socket and carry out information interaction.
Fig. 3 is the embodiment flow chart that utilizes the master-slave communication method of reliable and unreliable network in monitoring program of the present invention.Compared to Figure 1, Fig. 3's is preferred embodiment of the present invention schematic diagram.
S201: the SIGPIPE signal sending for kernel is described communication thread configuration process call back function.Avoid this thread to close because of described SIGPIPE signal.
S202: for monitoring program builds communication thread, the socket of described communication thread and the type of message corresponding with this socket are set.Wherein, described type of message comprises type of message based on TCP reliable network agreement and the type of message based on UDP unreliable network agreement.
S203: be SO_REUSEADDR by the describing word setup of attribute of the socket based on Transmission Control Protocol.
S204: by the poll pattern of the socket based on Transmission Control Protocol, and the poll pattern of the socket based on udp protocol is all set to unblock form.
S205: the IP address of Target Board and the port of each socket are bound.
Socket descriptor is written in readset, adopts each socket of select order poll.
S206: the mode of operation of each socket of poll, in the time that the port that socket detected is ready, fetch data from the port reads of this socket, obtain application layer data bag.
S207: process this application layer data bag, and the result of processing is write in the descriptor of this socket and carry out information interaction.
S208: the descriptor set that this socket is set is read operation.Again the mode of operation of each socket of poll.
Below in conjunction with ARM9 hardware platform, and load linux system as basis, the embodiment of the present invention is launched to explanation.Linux is as a multiple task operating system, and monitoring program is the application program operating in this system, and communication service thread is a thread of described monitoring program.Therefore implementation of the present invention is not limited to above-mentioned hardware platform or basis of software, only as example.
In implementation, Ethernet in physical layer based on network interface, write the NIC driver of Ethernet by Ethernet protocol, communication data is transferred to linux kernel, protocol stack ICP/IP protocol in linux kernel guarantees the reliability of data in IP layer and transport layer, data pass to the CLIENT PROGRAM of application layer after processing through linux kernel, in this case the communication service thread of monitoring program process is processed.
Another advantage of the present invention is, this communication service thread both can have been processed the packet based on Transmission Control Protocol, can process again the packet based on udp protocol.Like this, on the one hand in order to guarantee the reliability of communication task, exceed again on the other hand the expense of increase system, therefore here without the sub-thread that creates real deal with data by similar fork () function, but only have a main thread---communication service thread, not only realize the reception of data but also realized the processing of data.For the communication service thread being created under monitoring program, the raw data packets of receiving is resolved the application layer data bag obtaining by ICP/IP protocol, more for example, according to related protocol (CSP3 agreement) this application layer data bag is resolved.The multiplexed port technology of utilizing ICP/IP protocol to provide, can realize the mould of multiple human-computer interaction interface software or network management center and adjust instrument to connect the communication thread of supervisory control system by network interface, the function of monitoring program is inquired about or is arranged monitoring parameter and controlled in realization by communication task.The embodiment step of Fig. 3 is the refinement of above-mentioned implementation, wherein, and the initialization step that S201 to S205 is communication thread.
In the time that communication thread is confiscated the socket that can carry out " write operation ", linux kernel can send a SIGPIPE signal to this process, adopt the behavior of system default if do not catch this signal, process can stop automatically so, communication thread for fear of monitoring process stops, and then affect the control function of monitoring process to whole platform, be necessary that SIGPIPE signal setting is processed to call back function ignores this signal.
For the describing word of TCP socket, be SO_REUSEADDR by its setup of attribute, this socket option notice kernel, if port is busy, but tcp state is positioned at TIME_WAIT, can reuse port.If port is busy, and tcp state is positioned at other states, still obtains an error message while reusing port, indicates " address used in ".If think to restart immediately after your service routine stops, and new socket still uses same port, and now SO_REUSEADDR option is very useful.The attribute that utilizes IP address multiplex again to be restarted supervisory control system and can be realized the object that network communication can normally be used in order to reach in the situation that operating system is not restarted.In addition, for connection-oriented Transmission Control Protocol, because linux kernel is that any one given monitoring socket is safeguarded two queues, one has been connection queue, and another is completed connection queue.In order to reduce the expense of the webserver in supervisory control system, need to arrange the maximum connection number of monitoring socket, if the linking number of communication thread connects number more than the maximum arranging, communication thread will be abandoned some connection requests, and this function can realize by listen () system function.
TCP socket and UDP socket all obtain ready with the form of unblock., this thread must be put into sleep when asked I/O operation and just can complete with respect to obstruction form about the form of unblock, not put into sleep, but return to a mistake, without wait.In the time of system call executive communication thread, judge whether that ready socket is so that executing data obtains operation.Take such mode, can further reduce the expense of server, reduce the load of server.
After communication thread initialization, utilize I/O multiplexed port technology, pacify the TCP socket/UDP socket setting by poll, realize same communication service thread and both can realize connection-oriented TCP reliable communication, also can realize user datagram UDP communication, and by select function, the operation of I/O system call will itself should be blocked in, be blocked in this system call, but the implementation of this monitoring communications thread is: be all to adopt the pattern of unblock for the two, wait for that next time poll calls inspection and whether has socket ready.
If TCP socket is ready, return to the first socket descriptor of completed connection queue.Now ought there is socket ready, so just can know that having had the mould of human-computer interaction interface software or network management center to adjust tool software to be connected to supervisory control system starts inquiry or monitoring parameter is set, now just need to data be read out from socket descriptor, for example, resolve according to related protocol (CSP3 agreement) data of obtaining from socket again, and the order of communication is inquired about respectively or arranged, again the result of processing is write in socket descriptor, complete this data-bag interacting Processing tasks.
After a current data content of socket is disposed, reset descriptor set for " " (readset), poll is processed TCP/UDP descriptor set and obtained off-the-shelf connection and carry out data communication again in read operation.
So far,, when adopting the present invention to guarantee communication reliability, provide supervisory control system except traditional serial mode, to utilize the mode of network interface communication to increase the efficiency of network service.
Fig. 4 is the schematic diagram that utilizes the master-slave communication system of reliable and unreliable network in monitoring program of the present invention, comprising:
Threading building module, be used to monitoring program to build communication thread, the socket of described communication thread and the type of message corresponding with this socket are set, wherein, described type of message comprises type of message based on TCP reliable network agreement and the type of message based on UDP unreliable network agreement;
The port binding module being connected with described threading building module, for binding the IP address of Target Board and the port of each socket;
The port polling module being connected with described port binding module, for the mode of operation of each socket of poll;
The port read module being connected with described port polling module, in the time that the port that socket detected is ready, fetches data from the port reads of this socket, obtains application layer data bag;
The port writing module being connected with described port polling module, for processing after this application layer data bag, writes the result of processing in the descriptor of this socket and carries out information interaction.
Fig. 4 is corresponding with Fig. 1, identical with method of the operational mode of modules in figure.
Fig. 5 is the embodiment schematic diagram that utilizes the master-slave communication system of reliable and unreliable network in monitoring program of the present invention.
As shown in Figure 5, described threading building module, comprising:
Signal shielding unit, for the SIGPIPE signal sending for kernel, is described communication thread configuration process call back function, avoids this thread to close because of described SIGPIPE signal.
Setup of attribute unit, for being SO_REUSEADDR by the describing word setup of attribute of the socket based on Transmission Control Protocol.
As shown in Figure 5, described port polling module, comprising:
Mode setting unit, for by the poll pattern of the socket based on Transmission Control Protocol, and is all set to unblock form by the poll pattern of the socket based on udp protocol.
In the middle of an embodiment, the present invention, also comprises therein:
Being connected to the operation switch unit between described port writing module and described port polling module, is read operation for the descriptor set of this socket is set, the mode of operation of each socket of poll again.
Fig. 5 is corresponding with Fig. 3, identical with method of the operational mode of unit in figure.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a master-slave communication method of utilizing reliable and unreliable network in monitoring program, is characterized in that, comprising:
For monitoring program builds communication thread, the socket of described communication thread and the type of message corresponding with this socket are set, wherein, described type of message comprises type of message based on TCP reliable network agreement and the type of message based on UDP unreliable network agreement;
The IP address of Target Board and the port of each socket are bound;
The mode of operation of each socket of poll, in the time that the port that socket detected is ready, fetches data from the port reads of this socket, obtains application layer data bag;
Process this application layer data bag, and the result of processing is write in the descriptor of this socket and carry out information interaction.
2. the master-slave communication method of utilizing reliable and unreliable network in monitoring program according to claim 1, is characterized in that, before the step for monitoring program structure communication thread, comprising:
The SIGPIPE signal sending for kernel, is described communication thread configuration process call back function, avoids this thread to close because of described SIGPIPE signal.
3. the master-slave communication method of utilizing reliable and unreliable network in monitoring program according to claim 1 and 2, is characterized in that:
Be SO_REUSEADDR by the describing word setup of attribute of the socket based on Transmission Control Protocol.
4. according to the master-slave communication method of utilizing reliable and unreliable network in the monitoring program described in claims 1 to 3 any one, it is characterized in that:
By the poll pattern of the socket based on Transmission Control Protocol, and the poll pattern of the socket based on udp protocol is all set to unblock form.
5. the master-slave communication method of utilizing reliable and unreliable network in monitoring program according to claim 4, is characterized in that, after the result of processing is write carrying out the step of information interaction in the descriptor of this socket, also comprises:
The descriptor set that this socket is set is read operation, again the mode of operation of each socket of poll.
6. a master-slave communication system of utilizing reliable and unreliable network in monitoring program, is characterized in that, comprising:
Threading building module, be used to monitoring program to build communication thread, the socket of described communication thread and the type of message corresponding with this socket are set, wherein, described type of message comprises type of message based on TCP reliable network agreement and the type of message based on UDP unreliable network agreement;
The port binding module being connected with described threading building module, for binding the IP address of Target Board and the port of each socket;
The port polling module being connected with described port binding module, for the mode of operation of each socket of poll;
The port read module being connected with described port polling module, in the time that the port that socket detected is ready, fetches data from the port reads of this socket, obtains application layer data bag;
The port writing module being connected with described port polling module, for processing after this application layer data bag, writes the result of processing in the descriptor of this socket and carries out information interaction.
7. the master-slave communication system of utilizing reliable and unreliable network in monitoring program according to claim 6, is characterized in that, described threading building module, comprising:
Signal shielding unit, for the SIGPIPE signal sending for kernel, is described communication thread configuration process call back function, avoids this thread to close because of described SIGPIPE signal.
8. according to the master-slave communication system of utilizing reliable and unreliable network in the monitoring program described in claim 6 or 7, it is characterized in that, described threading building module, comprising:
Setup of attribute unit, for being SO_REUSEADDR by the describing word setup of attribute of the socket based on Transmission Control Protocol.
9. according to the master-slave communication system of utilizing reliable and unreliable network in the monitoring program described in claim 6 to 8 any one, it is characterized in that, described port polling module, comprising:
Mode setting unit, for by the poll pattern of the socket based on Transmission Control Protocol, and is all set to unblock form by the poll pattern of the socket based on udp protocol.
10. the master-slave communication system of utilizing reliable and unreliable network in monitoring program according to claim 9, is characterized in that, also comprises:
Being connected to the operation switch unit between described port writing module and described port polling module, is read operation for the descriptor set of this socket is set, the mode of operation of each socket of poll again.
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