CN112631815B - Inter-process communication method and system based on COM cross-process calling and shared memory - Google Patents
Inter-process communication method and system based on COM cross-process calling and shared memory Download PDFInfo
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- CN112631815B CN112631815B CN202110257312.0A CN202110257312A CN112631815B CN 112631815 B CN112631815 B CN 112631815B CN 202110257312 A CN202110257312 A CN 202110257312A CN 112631815 B CN112631815 B CN 112631815B
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- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/54—Interprogram communication
- G06F9/544—Buffers; Shared memory; Pipes
Abstract
The method and the system for interprocess communication based on COM cross-process calling and shared memory combine the COM cross-process calling technology and the shared memory technology, firstly, a calling end process dynamically allocates a continuous memory space in the shared memory, puts data into the memory space according to a specific format, and then transmits the initial offset of the memory as a parameter to a corresponding COM interface; and the COM informs the called process, the called process acquires the offset and accesses a corresponding position in the shared memory, data is acquired according to the same format, a result is still put into the shared memory after certain logic is executed, the control right is returned to the COM, and the calling end acquires an output result from the shared memory again. The invention realizes the function of cross-process communication for efficiently transmitting a large amount of data.
Description
Technical Field
The invention belongs to the technical field of interprocess communication and message transmission, and relates to an interprocess communication method and system based on COM (component object model) cross-process calling and shared memory.
Background
The inter-process communication is to transmit or exchange information among different processes, and is not only applied to the fields of operating systems, application software and the like, but also applied to the fields of industrial internet of things, real-time databases and the like.
The existing interprocess communication method comprises the following steps: pipes, message queues, etc.; however, the anonymous pipeline only supports one-way communication and can only be on a local machine, and the named pipeline cannot realize multi-process communication; when the message queue copies the message, it needs to consume extra time of the CPU, which is not suitable for the situation with large amount of information or frequent operation.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a method and a system for interprocess communication based on COM cross-process calling and shared memory, which not only solve the cross-network cross-process calling, but also solve the problem of mass data transmission among processes.
The invention adopts the following technical scheme:
the inter-process communication method based on COM cross-process calling and shared memory comprises the following steps:
step 1, a calling end dynamically allocates a continuous memory space in a shared memory, preset data to be transmitted among processes is put into the memory space according to a set format, and then the initial offset of the memory space is used as a parameter to be transmitted to a corresponding COM interface;
step 2, the called end obtains the initial position of the shared memory through the parameters of the COM interface, after finding the corresponding position, the memory space is explained according to the same format to obtain the data in the memory space, then the calling is carried out, the output parameters are still placed in the shared memory after the calling is finished and returned to the calling end,
the shared memory is a memory space in the same block accessed by a preset number of processes, and is also an inter-process communication mode;
step 3, after the calling end finishes calling, a return value is obtained from the COM interface, and an output parameter is obtained in the shared memory;
wherein, COM is a serial communication port.
In step 1, a shared memory is used to reduce the performance overhead of data replication during COM transfer.
In step 1, the calling end includes a memory offset unit, and the memory offset unit is configured to calibrate different initial offsets of the shared memory when the shared memory is loaded in each process.
In step 1, the COM interface adopts a macro mechanism to uniformly process formats in the shared memory, specifically:
automatically calculating the total space occupied by the format memory through the class constructor and dynamically allocating the shared memory;
automatically calculating the offset according to the length of the field, and automatically moving the position of the pointer according to the offset;
when exiting the scope, the allocated shared memory is automatically released through the destructor of the class.
The macro definition in the macro mechanism depends on the number of preset data fields, and the number of macro definitions is several due to the different number of the data fields; the same macro can be reused for the same number of data fields.
Because the output parameter is located in the shared memory, the recovery and release of the shared memory are performed after the call end sends the reply message.
In step 1, the set format is that the data are sequentially and continuously arranged in sequence.
In step 2, the called end adopts the corresponding macro definition for explaining the memory.
In step 3, the output parameter is located in the shared memory, and the recovery and release of the shared memory are performed after the reply message is sent.
The interprocess communication system of the interprocess communication method based on COM cross-process calling and shared memory comprises a dynamic allocation module, a format interpretation module and an output parameter module,
a calling end in the dynamic allocation module dynamically allocates a continuous memory space in a shared memory, puts data to be transmitted between processes into the memory space according to a set format, and then transmits the initial offset of the memory as a parameter to a corresponding COM interface;
the called end in the format interpretation module obtains the initial position of the shared memory through the parameters of the COM interface, after finding the corresponding position, the called end interprets the memory according to the same format to obtain data, then calls the memory, and after calling is finished, the output parameters are still placed in the shared memory and returned to the calling end;
and after the calling end in the output parameter module finishes calling, a return value is obtained from the COM interface, and an output parameter is obtained in the shared memory.
Compared with the prior art, the invention has the beneficial effects that:
the COM technology adopted by the invention realizes cross-process communication; the adopted shared memory technology realizes the function of transmitting a large amount of data required or returned during COM calling, and reduces the performance overhead of data copying in the COM transmission process. The invention provides a method for efficient interprocess communication and large-amount data transmission.
Drawings
FIG. 1 is a schematic flow diagram of an interprocess communication method based on COM cross-process calling and shared memory according to the present invention;
FIG. 2 is a schematic flow chart of an embodiment of inter-process communication based on COM cross-process invocation and shared memory according to the present invention;
fig. 3 is a schematic diagram of a specific structure of the inter-process communication system based on COM cross-process invocation and shared memory according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described herein are only some embodiments of the invention, and not all embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step on the basis of the spirit of the present invention are within the scope of protection of the present invention.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, a method for inter-process communication based on COM cross-process invocation and shared memory combines COM cross-process invocation technology and shared memory technology.
Step 1, a calling end dynamically allocates a continuous memory space in a shared memory, puts data to be transmitted between processes into the memory space according to a set format, and then transmits the initial offset of the memory as a parameter to a corresponding COM interface;
step 2, the called end obtains the initial position of the shared memory through the parameter of the COM interface, after finding the corresponding position, explain this block of memory according to the same format, obtain the data stated in step 1, then call, place the output parameter in this shared memory still after the call is finished, return to the calling end;
step 3, after the calling end finishes calling, a return value is obtained from the COM interface, and an output parameter is obtained in the shared memory;
wherein, COM is a serial communication port; the shared memory is a same internal memory space that can be accessed by a plurality of processes, and is also a communication mode among the processes.
The COM interface adopts a macro mechanism to uniformly process formats in the shared memory, and the macro needs to realize the following three functions:
firstly, automatically calculating the total space occupied by the format memory and dynamically allocating the shared memory, wherein the function can be completed through a class constructor;
secondly, automatically calculating the offset according to the length of the field, and automatically moving the position of the pointer according to the offset;
third, when exiting the scope, the allocated shared memory is automatically released, which can be accomplished through a class destructor.
And the COM informs the called process, the called process acquires the offset and accesses a corresponding position in the shared memory, data is acquired according to the same format, a result is still put into the shared memory after certain logic is executed, the control right is returned to the COM, and the calling end acquires an output result from the shared memory again and returns the output result to the client.
As shown in fig. 2, taking a snapshot-on-write call process of a real-time database as an example (putsanpshots), first, a network service process (server) dynamically allocates a continuous memory space (offset is position) in a shared memory, puts data into the memory space according to a specific format (for example, values of count, ids, dates, ms, values, states, qualities, and errors are sequentially and continuously put into the memory space), and then calls a COM interface with the offset position as a parameter; after being notified, the snapshot service process (snapshot) obtains the offset, accesses a corresponding position in the shared memory, obtains data in the same format, executes the snapshot writing logic, then puts the result (ecode, count, errors) into the shared memory, and returns the control right to the calling thread, and the network service process (server) obtains the output result from the shared memory again, wherein the sequence numbers in fig. 2 illustrate the sequence of various calls.
The application also discloses an interprocess communication system based on the COM cross-process calling and shared memory interprocess communication method, the specific structure is shown in figure 3, which comprises a dynamic allocation module, a format interpretation module and an output parameter module,
a calling end in a dynamic allocation module dynamically allocates a continuous memory space in a shared memory, data to be transmitted between processes is put into the memory space according to a set format, and then initial offset of the memory is taken as a parameter to be transmitted to a corresponding COM interface;
the called end in the format interpretation module obtains the initial position of the shared memory through the parameters of the COM interface, after finding the corresponding position, the called end interprets the memory according to the same format to obtain data, then calls the memory, and after calling is finished, the output parameters are still placed in the shared memory and returned to the calling end;
and after the calling end in the output parameter module finishes calling, a return value is obtained from the COM interface, and an output parameter is obtained in the shared memory.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (8)
1. An interprocess communication method based on COM cross-process calling and shared memory is characterized by comprising the following steps:
step 1, a calling end dynamically allocates a continuous memory space in a shared memory, preset data to be transmitted among processes is put into the memory space according to a set format, and then the initial offset of the memory space is used as a parameter to be transmitted to a corresponding COM interface; in step 1, the COM interface adopts a macro mechanism to uniformly process formats in the shared memory, automatically calculates the total occupied space of the format memory through a class constructor and dynamically allocates the shared memory; automatically calculating the offset according to the length of the field, and automatically moving the position of the pointer according to the offset; when exiting the scope, automatically releasing the allocated shared memory through the destructor of the class; the calling end comprises a memory offset unit, and the memory offset unit is used for calibrating different initial offsets of the shared memory when the shared memory is loaded in each process;
step 2, the called end obtains the initial position of the shared memory through the parameters of the COM interface, after finding the corresponding position, the memory space is explained according to the same format to obtain the data in the memory space, then the calling is carried out, the output parameters are still placed in the shared memory after the calling is finished and returned to the calling end,
the shared memory is a memory space in the same block accessed by a preset number of processes, and is also an inter-process communication mode;
step 3, after the calling end finishes calling, a return value is obtained from the COM interface, and an output parameter is obtained in the shared memory;
wherein, COM is a serial communication port.
2. The COM-based cross-process call and shared-memory interprocess communication method according to claim 1,
in step 1, the shared memory is used to reduce the performance overhead of data replication in the COM transmission process.
3. The COM-based cross-process call and shared-memory interprocess communication method according to claim 1,
the macro definition in the macro mechanism depends on the number of preset data fields, and when the number of the data fields is different, the number of the macro definitions is multiple; when the number of data fields is the same, the same macro may be reused.
4. The COM-based cross-process call and shared-memory interprocess communication method according to claim 1,
because the output parameter is located in the shared memory, the recovery and release of the shared memory are performed after the call end sends the reply message.
5. The COM-based cross-process call and shared-memory interprocess communication method according to claim 1,
in step 1, the set format is that the data are sequentially and continuously arranged in sequence.
6. The COM-based cross-process call and shared-memory interprocess communication method according to claim 1,
in step 2, the called end adopts the corresponding macro definition for explaining the memory.
7. The COM-based cross-process call and shared-memory interprocess communication method according to claim 1,
in step 3, the output parameter is located in the shared memory, and the recovery and release of the shared memory are performed after the reply message is sent.
8. An interprocess communication system using the COM cross-process call and shared memory based interprocess communication method of any claim 1-7, the system includes a dynamic allocation module, a format interpretation module and an output parameter module, characterized in that:
a calling end in the dynamic allocation module dynamically allocates a continuous memory space in a shared memory, puts data to be transmitted between processes into the memory space according to a set format, and then transmits the initial offset of the memory as a parameter to a corresponding COM interface;
the called end in the format interpretation module obtains the initial position of the shared memory through the parameters of the COM interface, after finding the corresponding position, the called end interprets the memory according to the same format to obtain data, then calls the memory, and after calling is finished, the output parameters are still placed in the shared memory and returned to the calling end;
and after the calling end in the output parameter module finishes calling, a return value is obtained from the COM interface, and an output parameter is obtained in the shared memory.
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| KR100252084B1 (en) * | 1997-11-05 | 2000-04-15 | 윤종용 | Method for writing/reading data and data access apparatus in multi-process system |
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