JPH07334377A - Information processor - Google Patents

Abstract

PURPOSE:To provide the information processor, with which the burden of a programmer required for signal setting can be reduced and exception processing can be surely and easily performed as intended, concerning the information processor composed of plural processing modules for processing a program to handle the exception processing. CONSTITUTION:A processor 1 stores the information on the exception processing to be executed while receiving a signal showing the necessity of exception processing during the execution and can receive the signal showing the necessity of exception processing. Since the contents of exception processing to be executed while receiving the same signal are sometimes made different for two modules, a signal reception setting device 5 stores the information on the stored contents of exception processing in a storage table 8 when moving from one module to the other module. When returning from the other module to one module, the information stored in the storage table 8 is read out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing apparatus configured to execute a program for handling exception handling, which is composed of a plurality of modules, and more particularly to setting of exception handling executed upon receiving a signal.

[0002]

2. Description of the Related Art In a certain type of program executed by an information processing apparatus, it is necessary to set an interrupt signal (signal) to a receivable state during execution of a certain processing module among the processing modules constituting the program. There is.

An example of the program is a text editor. After the user tells the text editor to print an entire very long file,
If you notice an error in the file, you need to interrupt the text editor to stop printing. To do so, it is necessary to set the state of the text editor so that the text editor can accept a signal to stop printing. With such a setting, when the user presses a specific key, the signal is sent to the editor, the editor receives the signal, and the process is switched from the process of executing printing to the process of canceling printing.

[0004] In this way, an exception is generated by causing an interrupt to be generated by sending a signal from the outside to a processing module that is operating normally and performing a specific processing. For example, in UNIX (a trademark of Bell Laboratories of AT & T Co., Ltd.), as exception processing for generating a signal, hardware such as illegal instruction or floating-point overflow is used in addition to the processing started by such key input. There are cases where processing is started due to the specific interrupt cause detected by. 31 kinds of such signals are defined in UNIX.

In order to enable the processing module being executed to perform exception processing, the procedure for receiving a signal in the module and the procedure for performing the processing determined when the signal is received are specified. I need to put it. This signal reception setting procedure is performed by designating the type of signal to be received to the operating system and further indicating how to handle the case when the signal is received.
After a signal is ready to be received, when the signal is issued to the executing module from outside the module, execution of the module is suspended, information about the contents of the execution state of the module is pushed onto the stack, and exception handling is performed. The module for is started.

In the conventional signal reception setting, since the procedure for receiving the signal is explicitly performed by using the system call prepared for that purpose, it is necessary for all programmers to know the setting state. . For example,
If the exception processing for the same type of signal differs from other sections only within a certain section of the program, a system call to change the signal reception setting at the beginning of the section Describe it in the program and the system call to restore the setting at the end of the section. In this way, the programmer manages the reception settings and changes the signal reception.

[0007]

Generally, a program is composed of a plurality of modules, and in some cases, some modules are present in each of the modules.
In the conventional signal reception setting method in which the programmer manages the signal setting state across a plurality of modules, the programmer sets the signal reception for each processing module. Therefore, when the program structure is complicated, there is a problem that the setting of signal reception becomes inaccurate due to a programmer's oversight, and the exception processing is not performed as intended. In addition, for a program created by another person, it may be troublesome for the programmer to clearly capture the signal reception setting, and there is a risk of causing a bug when the program is changed.

Therefore, it is effective to have an apparatus for automatically managing the signal reception range.

However, in the conventional signal reception setting method, there is only means for the programmer to consciously manage the signal reception range. That is, only one storage table that manages the signal setting information is set for the entire program, and as a result, when changing the signal setting information set in one module with the start of execution of another module, The programmer needs to confirm the information before the change. Then, when the processing of the other modules is completed and the processing returns to the original one module, it is necessary to correctly restore the signal setting information. When the program structure becomes complicated, it becomes difficult for the programmer to confirm.

An object of the present invention relates to an information processing apparatus which is composed of a plurality of processing modules and which processes a program for handling exception processing, reduces the load required by a programmer for signal setting, and ensures exception processing as intended. An object of the present invention is to provide an information processing device that can be easily and easily performed.

[0011]

[Means for Solving the Problems] In order to achieve the above object, a processing means for executing a program composed of a plurality of modules, and an exception processing required during execution of the above module are shown. A first storage means for storing information on the content of the exception handling executed in response to a signal, wherein at least two modules among the modules receive a signal indicating that exception handling is required. It is possible, and in the information processing device in which the contents of the exception processing for receiving and executing the same signal of at least one of the signals are different between the two modules, the exception processing stored in the first storage means. Second storage means for storing information about the contents of the module for saving, and execution of one of the above modules to another module. When the execution of the module is started, the setting means for storing the information about the content of the exception processing stored in the first storage means in the second storage means, and the execution of the other module from the execution of the one module When returning to the execution, there is provided a return means for returning the information stored in the second storage means to the first storage means.

Further, the second storage means is provided for each module.

The first storage means and the second storage means are provided for each process composed of a plurality of modules.

[0014]

When the control is transferred from one module to another module, the setting means causes the second storage means to store the information (signal setting information) regarding the content of the exception processing in the one module. When the control returns from another module, the restoring means reads the stored signal setting information of the one module and automatically resets it to the signal setting information before the control is transferred. This prevents the signal reception information set by other modules from reaching the one module.

Since a storage area for signal setting information is provided for each module, the signal setting information can be set in module units. As a result, the signal setting information can be managed in module units.

Since the signal setting information storage area is provided for each process, the signal setting information can be set in process units. As a result, the signal setting information can be managed (encapsulation) in process units. Encapsulation facilitates protecting the program from other programs.

[0017]

1 is a block diagram showing an embodiment of an information processing apparatus capable of handling exception handling according to the present invention. The information processing apparatus includes a processor 1 having a storage function.
In the processor 1, an operating system 2 and a program module 3 that handles exception processing and has an information processing service function are resident.

The operating system 2 provides a high level interface using the low level processing functions of the processor 1. The operating system 2 and the program module 3 are connected by a line 10 representing an interface. The operating system 2 performs a process (signal setting) for setting the correspondence between the signal and the processing content, which indicates what process is to be performed according to the signal. The program module 3 can request a service regarding signal setting through an interface shown by a line 10.

The program module 3 is the main module 4
And a slave module 6 and a signal reception setting device 5 placed between the two modules.
The main module 4 and the receiver module 6 are units constituting a program. In this embodiment, the module is a main routine or a subroutine, and a plurality of these modules are collected to form a process which is one execution unit. I am thinking about the case.

It is possible to consider modules other than processes as modules, and one module may correspond to one main routine, one subroutine, one object or the like. Further, the above-mentioned one main routine or the like may be divided into a plurality of parts, and each divided part may be used as a module.

Main module 4 and signal reception setting device 5
Is connected by a line 11 and the signal reception setting device 5 and the slave module 6 are connected by a line 12, and when there is a call from the main module 4 to the slave module 6, it goes through the signal reception setting device 5.

The signal reception setting device 5 has a signal setting processing unit 7 for acquiring and resetting the signal setting information, a signal setting information and a program counter (P
C) A storage table 8 for temporarily storing values. This storage table 8 is secured in a static storage area. Therefore, it is not affected by the update of the stack area related to the module switching. The storage table 8 is connected to the signal setting processing unit 7 by a line 13 representing an interface, and the signal setting processing unit 7
Access from.

Here, the program module 3 may be composed of one main module and several slave modules. That is, the master module may be connected to a plurality of slave modules, or the slave module may be connected to another slave module. In this case, one signal reception setting device may be arranged between all the modules, or one common signal reception setting device having a storage table equipped with a stack mechanism may be arranged. This embodiment is characterized in that the signal reception setting device 5 is provided between the modules whose execution is switched in the information processing device that handles exception processing.

FIG. 7 shows a general arrangement of storage areas in the execution environment of a program module that handles exception handling. This storage area is created for each process. FIG. 7 shows a storage area for one process. Storage area 7 used for executing program modules
Of 01, the data area 704 without initial value is a static area, is not affected by the update of the stack area 706, and can be accessed from any module. In this embodiment, an area 708 for the storage table 710 is secured in advance in this area, and a table management pointer 709 for managing this is provided. The storage table 710 is managed in a stack format, is generated to save the signal setting information of the calling module each time the module is called, and when the processing of the called module ends, the calling module Disappears as one of the processes to return to. This table management pointer 709 is stored in a specific address and can be accessed arbitrarily. If possible, it is desirable that a dedicated register is provided and stored in this register. The table management pointer 709 indicates the start address of the empty area of the storage table 710. On the other hand, the storage table 710 is provided for each module, but its size is a fixed length regardless of the module. Therefore, by adding or subtracting a number corresponding to the fixed size to the table management pointer 709, the storage table area 708. Can be created / disappeared according to the calling / termination of the module, and can be managed in a stack format.

The u area 711 in the storage area 701 is an area that can be accessed only by the operating system 2, and the signal setting information set by the above system call is stored here.

The storage format of the storage table 710 is, for example, as shown in FIG. 3, a signal number 301 and an address value 30 indicating operation designation information for the signal.
2 or the operation designation information itself can be stored. This field is prepared for the number of signals prepared by the system, and therefore the size of the storage table 710 is fixed.

FIG. 2 illustrates the signal reception setting method according to the present invention.

Generally, in the development of a program, a program module of an information processing service that handles exception handling is composed of a plurality of modules. Of these, the module that is executed first is called the main module, and the target module performs the intended processing while calling several slave modules. Here, another slave module may be called from the slave module and may have a nested structure. For example, the program module 3 of the information processing service which handles the exception handling shown in FIG. 1 is composed of one main module 4 and one slave module 6, and the slave module 6 is called during execution of the main module 4. The processing structure is such that when the processing in the slave module 6 is completed, the execution is restarted from the next portion called in the main module 4. The operation when the signal reception setting device 5 is installed between the main module 4 and the slave module 6 will be described with reference to FIG.

The information processing service that handles exception processing in this embodiment proceeds as follows. First, the execution of the process is started from the main module 4, and after the execution section A,
In step 202, the execution shifts to the slave module 6.
Conventionally, the execution control is switched to the slave module 6 as it is, but in the present embodiment, once the signal reception setting device 5 is executed.
After that, the slave module 6 is executed. In the signal reception setting device 5, first in step 203, the table management pointer 709 is increased by the fixed size of the storage table to acquire the storage table. Next step 20
In 4, the program counter (PC) value, which is the return address to the main module 4, is read and is temporarily recorded in the static storage area. Here, the storage location of the PC may be, for example, a portion 303 of the storage table secured in a static area as shown in FIG. Next, in step 205, a stack area required for the operation of saving the contents of the register of the main module is secured by operating the stack pointer, and the contents of the register are saved in this stack area. In step 206, the status of the signal set in the execution section A is recognized. The signal setting status is recognized by issuing a system call to the operating system 2. Eg POSI
X (Portable Operating System)
In a system call conforming to em Interface), three arguments are set: a signal number, a location where designated operation information is stored, and a location where current operation information for that signal is stored. POSIX is IEEE
It is a specification of UNIX OS which is being standardized by (American Institute of Electronics and Electrical Engineers). In the operating system equipped with this standard interface, in setting the arguments of the above system call, set the signal number for which you want to know the current specified operation information, and set the location where the specified operation information is stored to 0. For example, the current designated action information can be acquired. At step 206, designated operation information for all signal numbers is acquired, and at step 207
Then, the obtained designated operation information is recorded in the storage table for each signal number.

When the acquisition and recording of the signal setting information are completed as described above, the contents of the registers saved in the stack area are restored in step 208, and the stack area used for the work is released by operating the stack pointer. Then, in step 209, the return address is set to the current step and the process jumps to the slave module. Here, the stack area is once released so that the slave module 6 can correctly read the argument set by the main module 4 because the stack area is commonly used by all the modules.

When the execution control is switched to the slave module 6 and the execution section C is performed, the execution of the signal reception setting device 5 is resumed. In the signal reception setting device 5, first, in step 215, a stack area required for work is secured by operating the stack pointer, and the slave module 6
Save the register value of. If necessary here, the return value of the slave module is read and set in a register dedicated to the return value. Next, in step 216, the signal setting information is read in the order of the signal number based on the table management pointer 709, and in step 217, the signal designating operation is reset using the system call according to the setting information.

As a result, the signal setting status in the main module 4 before the control is transferred to the slave module 6 is restored. In step 218, the value of the register saved in the stack area is restored, and the stack area used for the work is released by operating the stack pointer. In step 219, the PC value 303 recorded in the storage table is read,
Prepare to return to main module 4. In step 220, the table management pointer 709 is decremented by a fixed size and the storage table is deleted. Finally, in step 221, the process jumps to the main module. Execution section B in main module 4
Is completed, and the information processing service that handles exception processing ends.

In the present invention, since the signal reception setting device 5 is connected between the main module 4 and the slave module 6,
A signal setting range is set for each processing module, and correct exception handling is performed when a signal is received. For example, in this embodiment, it is assumed that the instruction operation for the signal 1 is defined in step 201 in the execution section A of the main module 4. After that, the processing is switched to the slave module 6 and the execution section C is performed. Here, it is assumed that another instruction operation is defined for the signal 1 in step 210. Normally, the program is created in module units, so it is necessary to return the instruction operation for the signal 1 to the previous state by the time the processing of the slave module 6 ends and the processing returns to the main module 4. However, when there are several processing flows in the module, it is troublesome to complete the work of returning the instruction operation for the signal 1 to the previous state for each flow. Therefore, there is a problem that a signal resetting procedure is not performed due to an oversight. If this procedure is incomplete, after returning to the main module 4, when the signal 1 is received in the processing section B, the operation defined in the execution section A is not executed, and the exception processing different from the intended one is performed. There is a risk of doing.

When the signal reception setting device 5 of the present invention is applied, the signal setting information is recognized and recorded before the execution is switched to the slave module 6, and when the slave module 6 returns to the main module 4, this information is stored. It is reset to the previous setting status based on the above. Therefore, in the execution section B, the operation defined in the main module 4 is correctly performed, and there is no concern that an exception process different from the intended one will be activated when the signal is received.

In order to easily and surely set the signal reception on a module-by-module basis without the programmer being aware of it, in the present invention, the signal reception setting device 5 is connected between the modules whose execution is switched. However, in order to connect this device between modules, the linkage editor needs to perform the following operations. FIG. 4 is a block diagram illustrating a linkage editor used to connect the signal reception setting device 5 between two modules.

The main module 4 has been converted into a target program 401 by a compiler, and a text 406 corresponding to a machine language or work area and an external reference module control information 4 for the linkage editor 404 to process the text.
It is composed of 05. In this embodiment, since the slave module is called from the master module, the text 406 is an address constant 40 for indicating the address of the slave module.
Includes 7. The address constant 407 is connected to the linkage editor 404 by a line 422 representing an interface. This constant is written by the linkage editor 404 at the start address of the slave module when the slave module is connected to the master module. The external reference module control information 405 is connected to the linkage editor 404 by a line 421 representing an interface, and provides the linkage editor 404 with information about a module name called in the main module and where it is called.

The slave module 6 is converted into a target program 403 by a compiler, and is composed of text 412 corresponding to a machine language or a work area and module control information 411 for the linkage editor 404 to process the text. The module control information 411 is connected to the linkage editor 404 by a line 425 representing an interface, and tells the linkage editor 404 the start address where the text of the slave module starts.

The signal setting processing unit 7 in the signal reception setting device 5 is also converted into the object program 402, and the object program 402 is the text 409 corresponding to the machine language or the work area and the module control information for the linkage editor 404 to process the text. It is composed of 408. The text 409 contains an address constant 410 to the slave module that the master module is trying to call. The address constant 410 is the linkage editor 404.
And a line 424 representing the interface. This constant is written by the linkage editor 404 at the start address of the slave module when the slave modules are connected. The module control information 408 is connected to the linkage editor 404 by a line 423 representing an interface, and tells the linkage editor 404 the start address where the text of the signal setting processing unit starts.

In the conventional linkage editor, the main module and several slave modules are connected to generate one execution module. At this time, the linkage editor recognizes the slave module called from the main module by the external reference module control information of the main module, and reads the start address of the slave module from the module control information of the slave module. Then, write to the address constant in the main module text. Thereby, when the slave module is called from the main module, the execution can be switched to the processing of the slave module.

In the present invention, cancellation of signal setting,
Another feature is that the signal reception setting device 5 performs the resetting. In order for the programmer to effectively utilize this device without being aware of it, a means for automatically incorporating this device between modules is required. Therefore, in this embodiment, the linkage editor 404 is automatically incorporated. The linkage editor 404 connects the main module 4, the slave module 6, and the signal processing module 5 to generate the execution module 3. At this time, the linkage editor 404 reads the start address of the text 409 of the target program 402 of the signal setting processing unit from the module control information 408 and writes it in the address constant 407 in the main module text 406. Next, the external reference module control information 405 of the main module
Recognizes a slave module that is called from the main module, and module control information 411 of this slave module is recognized.
The read start address of the slave module text 412 is written into the address constant 410 of the text 409 of the signal setting processing unit. As a result, when the slave module 6 is called from the main module 4, it goes through the signal reception setting device 5 before execution is switched to the processing of the slave module 6, and the signal reception setting device 5 operates as the main module 4. It is possible to obtain the signal setting information of and store it. Furthermore, when returning from the slave module 6 to the main module 4, the signal reception setting device 5 is also used, so that the signal setting information of the main module 4 can be read and reset automatically by the signal reception setting device 5. It will be possible.

In the above embodiment, the module 3 may be composed of a main routine and a subroutine, or may be composed of a plurality of tasks, processes or objects. Further, the present invention may be applied to the module 3 as one main routine and each of a plurality of processing sections included therein as one module.

In the above embodiment, the means for incorporating the signal reception setting device by the linkage editor between the modules whose execution is switched is used. However, if a signal reception setting device is incorporated for each module whose execution is switched, the amount of the entire text becomes large and the storage area is unnecessarily consumed. Therefore, consider a case where a connection device that indirectly connects the modules is provided and the common signal reception setting device is called from this module.
Next, an example of this case will be described.

FIG. 5 is a block diagram showing another embodiment of the present invention in an information processing apparatus that handles exception handling. An information processing apparatus that handles exception processing is configured by a processor 501 having a storage capacity. An operating system 502 and a program module 503 of an information processing service that handles exception processing are resident in the processor 501.
The operating system 502 is a processor 501.
It provides a high-level functional interface using the low-level processing functions of. Operating system 502 and program module 503 are connected by a line 514 representing an interface.

The specific processing related to signal setting is performed by the operating system 502, and the program module 503 can request a service related to signal setting through the interface indicated by the line 514.

The program module 503 includes a main module 504 and a slave module 505, a connection device 507 and a signal reception setting device 5 that indirectly connect the two.
And 06. The connection device 507 is a module call processing unit 50 provided for each slave module.
8 and each module call processing unit 508 includes an address constant 511 indicating the start address of the slave module. In this embodiment, since it is composed of one slave module, the connection device 507 is composed of one module call processing unit 508 and an address constant 511 indicating the start address of the slave module 505. The main module 504 includes an address constant 510 for calling the slave module, but since the address is called indirectly, the start address of the module call processing unit 508 is stored in the address constant 510, and is connected by a line 515 representing an interface. Has been done.

The signal reception setting device 506 comprises a signal setting processing section 512 for acquiring and resetting the signal setting information and a table 513 for storing the signal setting information and the program counter value (PC). This storage table 513 is secured in a static storage area and is not affected by the update of the stack area related to module switching. The storage table 513 is connected to the signal setting processing unit 512 by a line 519 representing an interface, and receives access from the signal setting processing unit 512. The signal reception setting device 506 is connected to the module call processing unit 508 by a line 516 indicating an interface. The slave module 505 is connected by a line 517 indicating an interface. When indirectly calling the slave module 505 from the connection device 507, it goes through the signal reception setting device 506. The signal reception setting device 506 is line 5
The head address of the slave module 505 can be known from 16.

Here, the program module 503 of the information processing service which handles exception processing may be composed of one main module and a plurality of slave modules. That is, the master module may be connected to a plurality of slave modules, or the slave module may be connected to another slave module. In this case, the connection device 507 is provided with a module call processing unit for each slave module, but it suffices to arrange one common signal reception setting device, and the text of the program module handling exception processing increases unnecessarily. Can be prevented. This embodiment is characterized in that a common signal reception setting device is provided by indirectly calling a slave module in the previous embodiment.

FIG. 6 illustrates a signal reception setting method in the case where a common signal reception setting device is provided by indirectly calling subordinate modules.

First, the execution of the process is started from the main module 504, and after the execution section A has passed, the slave module 505 is called in step 602. In this embodiment, the slave device 505 is indirectly served by the connecting device 507.
Is called, the execution is first transferred to the module call processing unit 508 provided in the connection device 507, then the signal reception setting device 506 is passed, and then the slave module 505 is executed. Therefore, the connection device 50
In step 603, the module call processing unit 508 in No. 7 loads the address constant 511 of the slave module to the top of the stack or sets it in the register for arguments in order to deliver it to the signal reception setting device 505.

Next, at step 604, the common signal reception setting device 506 is jumped to.

In step 610, the signal reception setting device 506 first increases the table management pointer by the fixed size of the storage table to acquire the storage table. Next, in step 611, the main module 50
The program counter (PC), which is the return address to No. 4, is read and is temporarily recorded in the static storage area. Here, the storage location of the PC may be, for example, a portion 303 of the storage table secured in a static area as shown in FIG. Next, in step 612, a stack area required for the work is secured, and the contents of the register are saved in this stack area. In step 613,
The state of the signal set in the execution section A is recognized. The operating system 50 recognizes the signal setting status.
This is done by issuing a system call to 2. For example, in a system call conforming to the POSIX interface, three arguments are set: a signal number, a location where designated operation information is stored, and a location where current operation information for that signal is stored. In an operating system equipped with this standard interface, the location where the designated operation information is stored is 0 for a certain signal number.
If set to, the current designated motion information can be acquired. In step 613, designated operation information for all signal numbers is acquired, and in step 614, the obtained designated operation information is recorded in the storage table for each signal number.

When the acquisition and recording of the signal setting information are completed as described above, in step 609, the address constant for the slave module stored in step 603 is set in the register, and preparation is made to jump to the slave module appropriately. In step 615, the contents of the registers saved in the stack area are restored, and the stack area used for the work is released. Then, in step 616, the return address is set to the current PC, and the jump to the slave module is made based on the address constant in the register in step 609. Here, once the stack area is released, the argument set in the main module 504 is set to the sub module 5
This is because 05 can be read correctly. Now,
When the execution control is switched to the slave module 505 and the execution section C is performed, the signal reception setting device 506 is executed again.
Return to the bottom of execution. In the signal reception setting device 506, first, in step 621, the stack pointer is increased by the amount necessary for the work to secure the stack area, and the register value is saved. If necessary here, the return value of the slave module is read and set in a register dedicated to the return value. Next, in step 622, the signal setting information is read in the order of signal numbers based on the table management pointer, and in step 623, the signal designating operation is reset using a system call according to the setting information. As a result, the signal setting status in the main module 504 before the control is transferred to the slave module 505 is restored. In step 624, the value of the register saved in the stack area is restored, the stack pointer is reduced by the work area, and the used stack area is released. In step 625, the PC value 303 recorded in the storage table is read, and preparation for returning to the main module 504 is made. In step 626, the table management pointer is decremented by the unit table and the storage table is deleted. Finally, in step 627, the main module is jumped to. In the main module 504, the execution section B is completed, and the information processing service that handles exception processing ends.

In the above-described embodiments, the signal reception setting device is incorporated between the modules, and this device manages the signal reception so that the signal reception range can be handled for each processing module. In the embodiment shown below, a storage table having a stack function is provided in the operating system, and signal reception setting management is performed by a system call.

FIG. 8 is a block diagram showing an embodiment in which the present invention is realized by the function of an operating system in an information processing apparatus that handles exception handling. An information processing apparatus that handles exception processing is configured by a processor 801 having a storage capacity. In the processor 801, an operating system 802 and a program module 803 of an information processing service that handles exception processing are resident. The operating system 802 includes a storage table management device 80.
8 is installed to acquire a storage table set for each module and to perform initial setting and release. The operating system 802 and the program module 803 are connected by a line 810 representing an interface, and the specific processing relating to signal setting is performed by the operating system 8
02, program module 803 line 810
The service related to signal setting can be requested by the interface shown by.

The program module 803 is composed of a main module 804 and a slave module 806.

Here, the program module 803 of the information processing service which handles exception processing may be composed of one main module and a plurality of slave modules. That is, the master module may be connected to a plurality of slave modules, or the slave module may be connected to another slave module. This embodiment is characterized in that a processor 808 for managing a storage table is provided in the operating system.

FIG. 10 shows a general arrangement of storage areas in the execution environment of a program module that handles exception handling. Of the storage area 101 used for executing the program module, the u area 107 is a data area for use by the operating system, and a table 108 for preserving a storage table area 108 in this area and managing it. A management pointer 109 is provided. The table management pointer 109 is the storage table 110.
Indicates the start address of the empty area. On the other hand, the storage table 110 is provided for each module, but its size is a fixed length regardless of the module. Therefore, by adding or subtracting the number corresponding to the fixed size to the table management pointer 109, the storage table area 108 According to the calling / terminating of the module, create / disappear,
It can be managed in a stack format.

The storage format of the storage table 110 is, for example, as shown in FIG. 3, a signal number 301 and an address value 30 indicating operation designation information for the signal.
2 or the operation designation information itself can be stored. This field is prepared by the number of signals prepared by the system, and therefore the size of the storage table 110 is fixed.

In this embodiment, a storage table in the u area and a table management pointer 109 for managing the storage table so that the operating system can manage the signal reception setting information for each called processing module.
Is provided, and another reason for providing the storage table in the u area is to prevent the storage table from being destroyed due to a malfunction of the user program. In UNIX, since the u area is protected from other user programs, destruction can be prevented.

FIG. 9 illustrates a signal reception setting method using the operating system.

First, from the main module 804 to step 9
In 02, the slave module 806 is called. Then, control is transferred to the slave module, and at the beginning of the processing in the slave module, in step 903, the operating system 802 issues a command to acquire a storage table in the u area. Then, execution control is transferred to the storage table management device 808 in the operating system 802,
In step 911, the table management pointer is incremented by the unit table size, and in step 912, all the signal setting information in the main module is copied to this acquired area and the signal setting status of the calling module is inherited. This is because the setting value of the master module is used as the initial value of the signal setting information of the slave module. This is because when the setting of the signal is not newly made in the slave module, it should be considered that the setting value of the master module is inherited. Further, when changing the setting value in the slave module, there is no problem because the portion to be changed in this table is rewritten by the setting operation in the slave module.

Next, in step 913, the pointer pointing to the storage table used in the operating system is set to the current table management pointer 109 so that the operating system can access this table.
Same as the value of. With this, the storage table dedicated to this slave module is acquired in the u area, and the initial setting is completed.
After finishing the service in the operating system, it returns to the slave module 806. As a result, the storage table for managing the signal reception setting information dedicated to the slave module is set, and the signal operation instruction defined here does not reach the calling module, and as a result, the signal reception range is set to the module. Can be done in units.

Next, in the final processing in the slave module 806, an instruction to release the storage table set in the u area in step 904 is issued to the operating system 802. In response to this, the storage table management device 808 of the operating system decrements the table management pointer 109 by the unit table size in step 921, and then in step 922, the operating system detects the module (main module) of the called module (main module). The pointer that points to the storage table used in the operating system is made the same as the value of the table management pointer after subtraction so that the storage table can be accessed.

As described above, the storage table dedicated to the slave module is released from the u area, and the control is transferred from the operating system to the main module. By this,
It has been reset to the signal setting status of the calling module.

In the above embodiment, the information regarding the exception processing stored in the first storage means is provided for each of the plurality of modules.

[0066]

Since the present invention is configured as described above, signal reception can be set in processing module units, and the burden of setting management for signal reception on the programmer can be reduced.

Therefore, according to the present invention, it is possible to surely and easily perform the intended exception processing, and to improve the efficiency of creating a program for handling the exception processing.

Further, in the present invention, since the range of signal reception setting can be set in module units, encapsulation related to signal reception is possible, and there is an effect that it can be applied to program development based on object orientation.

[Brief description of drawings]

FIG. 1 is a block diagram of an information processing device according to the present invention.

FIG. 2 is a flowchart of processing of a signal reception setting device.

FIG. 3 is an explanatory diagram of a table for storing signal setting information and a PC.

FIG. 4 is an explanatory diagram of an operation of a linkage editor that connects a signal reception setting device between two program modules.

FIG. 5 is a block diagram showing another embodiment of the information processing apparatus according to the present invention.

FIG. 6 is a flowchart of processing of a common signal reception setting device by indirect connection of slave modules.

FIG. 7 is an explanatory diagram of arrangement of storage areas in a program module execution environment.

FIG. 8 is a block diagram showing an embodiment of an information processing device when the present invention is realized by using an operating system.

FIG. 9 is a flowchart of a signal reception setting method using an operating system.

FIG. 10 is an explanatory diagram of a storage area arrangement in a program module execution environment.

[Explanation of symbols]

1 ... Processor, 2 ... Operating system, 3 ...
Program module, 4 ... Main module, 5 ... Signal reception setting device, 6 ... Slave module, 7 ... Signal setting processing unit, 8 ... Storage table

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomoaki Nakamura 5-2-1 Omika-cho, Hitachi City, Ibaraki Prefecture Hitachi Ltd. Omika Plant, Ltd. (72) Inventor Akifumi Nakahashi 5-chome, Omika-cho, Hitachi City, Ibaraki Prefecture No. 2 No. 1 in Hiritsu Process Computer Engineering Co., Ltd.

Claims (8)

[Claims] 1. Processing means for executing a program composed of a plurality of modules, and when exception processing is required during execution of the module, the exception processing is executed by receiving a signal indicating that it is necessary. A first storage means for storing information about the content of the at least one of the modules, wherein at least two of the modules are capable of accepting a signal indicating that exception handling is required, and at least one of the signals. In an information processing device in which the contents of exceptional processing for receiving and executing one same signal are different between the two modules, the information regarding the contents of the exceptional processing stored in the first storage means is stored for saving. A second storage means for executing the above, and when the execution of one of the modules is changed to the execution of the other module, Setting means for storing in the second storage means the information related to the content of the exception processing stored in the first storage means; and, when returning from the execution of the other module to the execution of the one module, the second An information processing device, comprising: a return unit that returns the information stored in the storage unit to the first storage unit. 2. The information processing apparatus according to claim 1, wherein the second storage unit is provided for each module. 3. The information processing apparatus according to claim 1, wherein the first storage means and the second storage means are provided for each process including a plurality of modules. . 4. The information processing apparatus according to claim 1, 2 or 3, wherein the setting means and the restoring means are provided for each pair of modules to be executed. 5. The information processing apparatus according to claim 1, 2 or 3, wherein the setting means and the returning means are provided in common for a plurality of pairs of modules to be executed. apparatus. 6. When executing a program including a plurality of modules, when exception processing is required during execution of the module, the exception processing is executed by receiving a signal indicating the necessity. First information about contents
At least 2 of the modules stored in the storage means of
The two modules can receive a signal indicating that exception handling is required, and the content of the exception handling that receives and executes at least one of the same signals is different between the two modules. In the method, information about the content of the exception handling stored in the first storage means is stored in a second storage means for saving, and execution of one of the modules to execution of the other module. When the information about the content of the exception processing stored in the first storage means is stored in the second storage means and the execution of the other module returns to the execution of the one module. In the information processing method, the information stored in the second storage means is returned to the first storage means. 7. The information processing method according to claim 6, wherein the second storage means stores information regarding the content of the exception processing for each module. 8. The information processing method according to claim 6, wherein the first storage means and the second storage means store information regarding the content of the exception processing for each process composed of a plurality of modules. An information processing method comprising: