JPH0760392B2 - Abend exit routine management method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormal termination exit routine management system in an electronic computer.

[0002]

2. Description of the Related Art When a program terminates abnormally, post-processing may be required because the processing has not been completed.
For such processing, conventionally, an abnormal termination exit routine is called at the time of abnormal termination of a program, and various processing is performed by this routine.

By the way, during execution of the abnormal termination exit routine, the user is instructed to terminate the execution of the program by K.
Conventionally, there are the following two methods regarding how to execute a program when a forced termination request is generated due to a J command input or a termination request from a system program.

One of them is, for example, "ACOS Software ACOS-4 / XVP Supervisor Manual" (1
9th of November 992 2nd edition, published by NEC Corporation)
Page 5, 3.6.1.4 “Setting the abnormal termination exit routine”
As can be seen from the above, even if the abnormal termination exit routine is in the middle of execution, if the user issues a forced termination request by the KJ command during execution of the abnormal termination exit routine or the system issues a forced termination request. This is a method of interrupting the routine and forcibly ending the program.

The other is, for example, Japanese Patent Laid-Open No. 2-182323.
As disclosed in Japanese Patent No. 0, when the forced termination request is issued, if the abnormal termination exit routine is being executed, the routine is continued and the program is not forcedly terminated.

[0006]

As described above, there are the above-described two methods as the handling method when the forced termination request is issued during the execution of the abnormal termination exit routine. There has not been a combined method, that is, a method in which the user can arbitrarily specify whether or not to forcibly terminate the program when a forced termination request is issued during execution of the abnormal termination exit routine. Therefore, there are the following problems.

There are two types of abnormal termination exit routines, an abnormal termination exit routine defined by the user and a system-defined abnormal termination exit routine prepared in advance by the system. The former user-defined abend exit routine has the advantage that it can be created by the user and can describe the process that meets the user's needs. There is a high possibility of falling into an infinite loop. On the other hand, the system-defined abend exit routine tends to be unable to accurately meet the needs of individual users, but its reliability is almost guaranteed because it is carefully inspected by the manufacturer before shipment. Since it is provided as a part of the system program, there is an advantage that it is possible to describe the processing that goes into the operation of the system resource.

Therefore, under the environment in which the user can use an arbitrary abnormal termination exit routine from the above two types of abnormal termination exit routines, when a user-defined abnormal termination exit routine is used, an error occurs. It is desirable to be able to select a method for forcibly terminating the program when there is a forced termination request during execution of the termination exit routine. Because,
If a program cannot be killed by a forced termination request while the abend exit routine is running, it will not be possible to exit the infinite loop caused by the buggy user-defined abend exit routine and eventually halt the entire system. Because it will not be possible.

On the other hand, when the system-defined abend exit routine is used, its reliability is high and the possibility of falling into an infinite loop is extremely low. Since the system resource may be manipulated, the routine is interrupted when interrupted. The system resources secured by are not released and the management of the system resources becomes illegal, and it is not desirable that the system-defined routine be interrupted by a KJ command entered by a user error. Considering the above, it is desirable to be able to select a method in which the program is not forcibly terminated by the forced termination request during execution of the abnormal termination exit routine.

However, in the prior art, when a forced termination request is issued during execution of an abnormal termination exit routine, it is fixedly decided whether or not to forcibly terminate the program. Routine and user-defined abend exit routine In an environment where the user can select an arbitrary routine from two types of routines, it is said that the process at the time of a forced termination request cannot be controlled in the optimal method for the selected routine. There's a problem.

The present invention has been made in view of such circumstances, and an object thereof is to forcibly terminate a program or not when a forced termination request is issued during execution of an abnormal termination exit routine. Is to provide an abend exit routine management method that can be set according to the type of the abend exit routine.

[0012]

In order to achieve the above object, an abnormal termination exit routine management system of the present invention has an exit address storage area and a system exit registration flag provided in a load module and a load module creation. Occasionally, an exit address registration means for setting an address of an abnormal termination exit routine in the created exit address storage area in the load module, and an abnormal termination of the address set in the exit address storage area in the load module by the exit address registration means System exit registration means that turns on the system exit registration flag in the load module when the exit routine is a system-defined abend exit routine, and turns it off when it is another abend exit routine, and at program load Exit in the load module to be loaded Address loading means for loading the contents set in the address storage area to the exit address storage area in the execution space corresponding to the program, and the contents of the system exit registration flag in the load module to be loaded when loading the program in the execution space System exit registration flag loading means for loading the system exit registration flag of the above, and when the program ends abnormally, the system exit registration flag on the execution space corresponding to the abnormally terminated program is referred to and the execution space The system exit executing flag setting means for turning on the above system exit executing flag, and the abnormal termination exit by referring to the contents of the exit address storage area in the execution space after the processing of the system exit executing flag setting means Exit routine executing means for passing control to the routine, and the above abnormality A system outlet in progress flag cancellation means to turn off the system outlet execution flag on the execution space after completion execution of completion exit,
Program forced termination means for performing forced termination processing of a program and system exit executing flag for referencing the system exit executing flag in the execution space at the time of forced termination request and passing control to the program forced termination means only when it is OFF And a determining means.

[0013]

When the load module is created, the exit address registration means sets the address of the system-defined or user-defined abnormal termination exit routine in the exit address storage area in the created load module, and the system exit registration means Turns on the system exit registration flag in the load module when the abend exit routine is a system-defined abend exit routine, and turns it off when it is another user-defined abend exit routine.

When loading a program, the exit address loading means loads the contents set in the exit address storage area in the load module to be loaded into the exit address storage area in the execution space (virtual storage space) corresponding to the program. Together with the system exit registration flag loading means,
The contents of the system exit registration flag in the load module to be loaded are loaded into the system exit registration flag on the execution space. Of course, at this time, the load module body to be loaded and the designated abnormal termination exit routine are also loaded.

After that, when execution of the program is started and abnormally ended, the system exit in-execution flag setting means refers to the system exit registration flag in the execution space corresponding to the abnormally ended program, and if it is on, the execution space The above system exit executing flag is turned on, and then the exit routine executing means refers to the contents of the exit address storage area on the execution space and passes control to the abnormal termination exit routine. As a result, the system-defined abend exit routine or the user-defined abend exit routine specified when the load module was created is executed.

When the execution of the abnormal termination exit routine ends without delay, the system exit executing flag canceling means turns off the system exit executing flag in the execution space.

During execution of the abnormal termination exit routine,
If there is a forced termination request, the system exit executing determination means refers to the system exit executing flag in the execution space, and only when it is off, that is, only when the system-defined abnormal termination exit routine is not executing, Pass control to the program forced termination means. The program forced termination means performs a program forced termination process.

[0018]

Embodiments of the present invention will now be described in detail with reference to the drawings.

Referring to FIG. 1, an embodiment of the abnormal termination exit routine management system of the present invention is provided with an exit address storage area 1 and a system exit registration flag 2 in a load module LM created by a user. An exit address storage area 3, a system exit registration flag 4, a system exit in-execution flag 5 and an execution priority storage area 6 are provided on an execution space (virtual storage space) MM corresponding to a program in which LM is loaded, and a load module is further created. Exit address registration means 11 that sometimes operates
Also, the system exit registration means 12, the exit address loading means 21 and the system exit registration flag loading means 22 that operate when the program is loaded, the priority changing means 31, the system exit executing flag setting means 32, and the exit routine that operate when the program ends abnormally. Execution means 33, system exit in-progress flag releasing means 34 and priority restoring means 35, execution program selecting means 51 operating during dispatcher operation, system exit in-execution determining means 41 operating during forced termination request, special forced termination request determination It has means 42, system resource releasing means 43, and program forced termination means 44.

The exit address storage area 1 in the load module LM is an area for storing the address of an abnormal termination exit routine that is specified when the load module is created and is called when the program terminates abnormally.

The system exit registration flag 2 in the load module LM indicates whether the abnormal termination exit routine registered in the load module LM is an abnormal termination exit routine prepared in advance by the system, in other words, the abnormal termination exit routine. Is registered as a system exit, it indicates that a system-defined abend exit routine was registered in the ON state, and other user-defined abend exit routines were registered in the OFF state. Indicates that.

Exit address storage area 3 in execution space MM
Is an area for storing the address of the abnormal termination exit routine of the program loaded in the execution space MM.

The system exit registration flag 4 in the execution space MM is a flag indicating whether or not the abnormal termination exit routine of the program loaded in the execution space MM is a system-defined abnormal termination exit routine. The abnormal termination exit routine is shown, and the abnormal termination exit routine in the OFF state is shown.

The system exit executing flag 5 in the execution space MM indicates whether the program loaded in the execution space MM is executing the system exit, that is, whether the system-defined abend exit routine is being executed. It is a flag indicating whether or not it is in the on state, indicating that it is executing, and in the off state, indicating that it is not executing.

The execution priority storage area 6 is an area for storing an execution priority which is a criterion for allocating a CPU to a program loaded in the execution space MM.

If there is a request for registration of an abnormal termination exit routine when creating the load module LM, the exit address registration means 11 stores the address of the abnormal termination exit routine requested for registration in the exit address storage area 1 in the load module LM. It is a means of setting.

The system exit registration means 12 executes the registered abnormal termination exit routine when the exit address registration means 11 registers the address when a request for registration of the abnormal termination exit routine is made when the load module LM is created. Whether or not it is a system-defined abend exit routine is recognized based on, for example, the specification from the user, and when it is a system-defined abend exit routine, the load module LM
System exit registration flag 2 is turned on for all other abnormal termination exit routines, and system exit registration flag 2
Is a means to turn off. FIG. 2 shows the flow of processing of such a system exit registration means 12.

The exit address loading means 21 is means for loading the contents of the exit address storage area 1 of the load module LM into the exit address storage area 3 of the execution space MM when the load module LM is loaded into the execution space MM.

System exit registration flag loading means 22
Is a system exit registration flag 2 of the load module LM when the load module LM is loaded into the execution space MM.
Is loaded into the system exit registration flag 4 of the execution space MM.

The priority changing means 31 checks the system exit registration flag 4 of the execution space MM when the program loaded in the execution space MM ends abnormally, and if this flag 4 is on, stores the execution priority of the execution space MM. This is means for saving the current execution priority stored in the area 6 and setting the execution priority for the system program in the execution priority storage area 6 instead. For example, a computer that has 16 levels of execution priority from 0 to 15 with the highest execution priority, of which 8 levels from 0 to 7 are used for the system program and 8 levels from 8 to 15 are used for the user program, At the execution stage of the user's program loaded in the execution space MM, any of the execution priorities 8 to 15 is set in the execution priority storage area 6, and the priority changing means 31 replaces such a low execution priority. , A higher execution priority indicating, for example, 7 out of 0 to 7 is set in the execution priority storage area 6. FIG. 3 shows a flow of a processing example of the priority changing means 31.

System exit in-execution flag setting means 32
Is a means for checking the system exit registration flag 4 after the operation of the priority changing means 31 and turning on the system exit executing flag 5 if it is in the ON state. The flow of the processing is shown in FIG. Show.

The exit routine executing means 33 refers to the exit address storage area 3 of the execution space MM to obtain the address of the abnormal termination exit routine to be executed after the operation of the system exit in-progress flag setting means 32 is completed. It is a means of passing control to the appropriate abend exit routine using the address. Although not shown in FIG. 1, the abnormal termination exit routine is placed in the execution space MM.

System exit executing flag canceling means 34
Is a means for turning off the system exit in-execution flag 5 of the execution space MM after the execution of the exit routine executing means 33, that is, after the execution of the abnormal termination exit routine.

The priority restoring means 35 is means for setting the original execution priority saved by the priority changing means 31 in the execution priority storage area 6 of the execution space MM after the operation of the system exit in-execution flag releasing means 34 is completed. is there.

The execution program selection means 51 is means for determining a program to be executed by referring to the execution priority set in the execution priority storage area 6 of the execution space MM during the dispatcher operation.

The system exit executing determination means 41 refers to the system exit executing flag 5 of the execution space MM at the time of the forced termination request, passes control to the program forced termination means 44 when it is off, and when it is on. Is a means for transferring control to the special forced termination request judging means 42.

There are two types of forced termination requests, one is a special forced termination request, and the other is a normal forced termination request. The special forced termination request is automatically issued inside the system when a serious event occurs, for example, when there is no more stack due to stack overflow. On the other hand, the normal forced termination request is
For example, it is a request generated by inputting a KJ command from the user.

The system-exit-in-execution judging means 41 performs the above-mentioned operation when there is a request for either normal forced termination request or special forced termination request. FIG. 5 shows a processing example of the system exit executing determination means 41.

Upon receiving the control from the system exit in-execution judging means 41, the special forced termination request judging means 42 judges whether or not the forced termination request issued this time is a special forced termination request. For example, it is a means for passing control to the system resource releasing means 43 and ending the processing at the time of the forced termination request if it is the normal forced termination request instead of the special forced termination request. FIG. 6 shows such special forced termination request judging means 42.
The processing example of is shown.

Upon receiving the control from the special forced termination request judging means 42, the system resource releasing means 43 releases the system resources secured by the system-defined abnormal termination exit routine (for example, a table shared by all system programs). Is released), and the control is passed to the program forced termination means 44 after the release.

The program forced termination means 44 is means for forcibly terminating a program which is being executed (in a running state, a ready state, a wait state) or suspended in execution by receiving the control. is there. Specifically, for example, the execution of the task at that time is interrupted, the termination processing of each function for each interrupted task is performed, and the job scheduler is notified that the execution of the job is terminated.

The operation of the abnormal termination exit routine management system of the present embodiment configured as described above will be described below.

"When creating load module" When the user creates a load module LM by linking several compilation units, if the command specifies an abnormal termination exit routine to be linked, the load module LM
The same abend exit routine is linked to all the tasks inside. At this time, the exit address registration means 11 sets the address of the designated abnormal termination exit routine in the exit address storage area 1 of the load module LM.

At the same time, the system exit registration means 12 determines whether or not the designated abnormal termination exit routine is designated as an abnormal termination exit routine of the system program, that is, the abnormal termination exit routine requested by the user to be linked. It is judged whether or not it is a system-defined abnormal termination exit routine (201 in FIG. 2), and if it is a system-defined one, the system exit registration flag 2 of the load module LM is turned on (202), otherwise it is a user-defined one. If so, the system exit registration flag 2 is turned off (203).

[At Program Loading] When the created load module LM is loaded into the execution space MM, the exit address loading means 21 reads the contents of the exit address storage area 1 of the load module LM and reads the exit address of the execution space MM. Stored in the storage area 3, the system exit registration flag loading means 22 reads the content of the system exit registration flag 2 of the load module LM and stores it in the system exit registration flag 4 of the execution space MM. Through the above processing, the system exit registration flag 4 of the execution space MM is turned on when the system-defined abend exit routine is used, and turned off when the user-defined abend exit routine is used. The state of the abnormal termination exit routine used is stored in the exit address storage area 3 of the execution space MM.

At this point, the system exit executing flag 5 of the execution space MM is initialized to OFF. Further, in the execution priority storage area 6, the execution priority for the user program designated by the user is set when the program is started.

"At the time of abnormal termination of program" The execution program selection means 51 refers to the execution priority stored in the execution priority storage area 6 of the execution space MM and allocates the CPU. The execution program selecting means 51 dispatches the program in the execution space MM, whereby the execution of the program in the execution space MM is started.

When the program that has started execution abnormally terminates due to an exception or the like, control is passed from the system termination processing to the priority changing means 31.

The priority changing means 31 first checks whether or not the system exit registration flag 4 of the execution space MM corresponding to the abnormally terminated program is in the ON state (301 in FIG. 3). If it is in the ON state, the abnormal termination exit routine used is a system-defined one, so the execution priority for the user stored in the execution priority storage area 6 is stored in a work area (not shown) (30
2) Alternatively, the high execution priority of the system (for example, the execution priority of 7 as described above) is stored in the execution priority storage area 6 (303). Then, the control is passed to the system exit executing flag setting means 32.

On the other hand, when the system exit registration flag 4 is off, the priority change 31 does not change the priority because the abnormal termination exit routine used is a user-defined one. It is passed to the setting means 32.

System exit in-execution flag setting means 32
Checks whether the system exit registration flag 4 on the execution space MM is in the on state (401 in FIG. 4), and if it is on, turns on the system exit executing flag 5 (40
2), if it is off, system exit executing flag 5
Is turned off (403). Then, the control is passed to the exit routine executing means 33.

The exit routine executing means 33 has an execution space M.
The address stored in the exit address storage area 3 of M is taken out, and the abnormal termination exit routine at the address destination is called. As a result, the system-defined abend exit routine or the user-defined abend exit routine specified by the user is executed.

When the execution of the called abnormal termination exit routine is completed normally, the control is transferred from the exit routine executing means 33 to the system exit executing flag canceling means 34, and the system exit executing flag canceling means 34 executes the execution space MM.
The upper system exit executing flag 5 is turned off. After that, the priority returning means 35 operates to store the original execution priority stored in the work area by the priority changing means 31 in the execution priority storage area 6 of the execution space MM, and the processing upon abnormal termination of the program ends.

"At the time of forced termination request" When a normal forced termination request is issued by inputting a KJ command, or when a special forced termination request is issued inside the system, the system exit execution judging means 41 operates.

The system exit execution judging means 41 checks whether or not the system exit execution flag 5 of the execution space MM is on (501 in FIG. 5), and if it is off, the system-defined abnormal termination exit routine. Is not running
Control is passed to the program forced termination means 44 (503),
The program forced termination means 44 forcibly terminates the program. As a result, when the forced termination request is issued while the user-defined abnormal termination exit routine is being executed, the execution of the abnormal termination exit routine is interrupted.

On the other hand, if the system exit in-execution flag 5 is on, it means that the system-defined abnormal termination exit routine is being executed, so the system exit in-execution judging means 41 passes control to the special forced termination request judging means 42 ( 502).

When the special forced termination request judging means 42 takes over the control, it judges whether or not the forced termination request generated this time is the special forced termination request (601 in FIG. 6). The processing at the time of the termination request is completed. Therefore, even if a normal forced termination request is issued during execution of the system-defined abend exit routine, the program is not forcibly terminated and the system-defined abend exit routine is not interrupted during processing.

However, if the request is a special forced termination request instead of a normal forced termination request, the special forced termination request judgment means 42.
Transfers control to the system resource releasing means 43 (602).
When the system resource releasing means 43 takes control, it releases the system resources, and then passes control to the program forced termination means 44, and the program forced termination means 44 forces the program to terminate. Therefore, even if the system-defined abnormal termination exit routine is being executed, the program will be forced to abnormally terminate if a special forced termination request is made. At this time, the processing of the abnormal termination exit routine is interrupted midway, but since the system resource secured by it is released by the system resource releasing means 43, the system resource remains occupied. There is no.

[0059]

According to the abnormal termination exit routine management system of the present invention described above, the following effects can be obtained.

If there is a forced termination request during execution of the abnormal termination exit routine, the program is forced to terminate, or
The user can freely set whether or not to allow it when creating the load module. Therefore, the system-defined abend exit routine, the user-defined abend exit routine, etc.
In an environment in which the user can select an arbitrary abend exit routine from among different types of abend exit routines, it is possible to control the processing at the time of a forced termination request by the optimum method according to the selected abend exit routine. Become.

When a system-defined abend exit routine is used, a predetermined execution priority for the system is set during execution of the routine, so that the system-defined abend exit routine has a lower execution priority. Run on. As a result, the system-defined abnormal termination exit routine is preferentially executed in the multi-job execution environment, which enables swift occupation and release of system resources to improve the throughput of the entire system.

Even if the system-defined abnormal termination exit routine is used, if the forced termination request is a special forced termination request, the program can be forcibly terminated. Even if the routine does not finish due to it, it can be forcibly terminated.

Since the system resource is released at the time of the special forced termination request, it is possible to prevent the system resource from being left occupied by the abnormal termination exit routine which has been forced to terminate.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing example of a system exit registration means.

FIG. 3 is a flowchart showing a processing example of a priority changing unit.

FIG. 4 is a flowchart showing a processing example of a system exit in-execution flag setting means.

FIG. 5 is a flowchart showing a processing example of a system exit executing determination means.

FIG. 6 is a flowchart showing a processing example of a special forced termination request determination means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Exit address storage area 2 ... System exit registration flag 3 ... Exit address storage area 4 ... System exit registration flag 5 ... System exit executing flag 6 ... Execution priority storage area 11 ... Exit address registration means 12 ... System exit registration means 21 ... exit address loading means 22 ... system exit registration flag loading means 31 ... priority changing means 32 ... system exit executing flag setting means 33 ... exit routine executing means 34 ... system exit executing flag releasing means 35 ... priority returning means 41 ... system Exit executing determination means 42 ... Special forced termination request determination means 43 ... System resource release means 44 ... Program abnormal termination means 51 ... Execution program selection means LM ... Load module MM ... Execution space

Claims (4)

[Claims] 1. An exit address storage area and a system exit registration flag provided in a load module, and an exit for setting an address of an abnormal termination exit routine in the created exit address storage area in the load module when the load module is created. Address registration means and a system exit registration flag in the load module when the abnormal termination exit routine of the address set in the exit address storage area in the load module by the exit address registration means is a system-defined abnormal termination exit routine On the execution space corresponding to the program, and the system exit registration means for turning on and turning it off for other abnormal termination exit routines, and the contents set in the exit address storage area in the load module to be loaded when the program is loaded. Exit address storage area Area, an exit address loading means for loading into the area, a system exit registration flag loading means for loading the contents of the system exit registration flag in the load module to be loaded into the system exit registration flag in the execution space when the program is loaded, and the program abnormal termination. And a system exit executing flag setting means for turning on a system exit executing flag in the execution space when it is turned on by referring to the system exit registration flag corresponding to the abnormally terminated program. An exit routine executing means for passing control to an abnormal termination exit routine by referring to the contents of the exit address storage area in the execution space after the processing by the system exit executing flag setting means, and an execution termination of the abnormal termination exit routine Later turn off the system exit running flag on the execution space System exit executing flag canceling means, program forcible ending means for forcibly ending the program, and the system exit executing flag in the execution space when a forced termination request is made, and the program is forced only when it is off An abnormal termination exit routine management system, comprising: a system exit execution determining means for transferring control to the termination means. 2. An execution program selecting means for determining a program to be executed by referring to an execution priority storage area in the execution space when the dispatcher operates, and an abnormal termination exit routine executed by the exit routine executing means when the program terminates abnormally. Prior to the execution, the priority changing means for saving the execution priority for the user set in the execution priority storage area on the execution space and setting the execution priority for the system instead, and the system exit in-execution flag releasing means 2. The abnormal termination exit routine management method according to claim 1, further comprising: priority returning means for returning the saved execution priority to the execution priority storage area in the execution space after the processing of. 3. When a forced termination request is made, it is judged whether or not the request is a special forced termination request, and since it is a special forced termination request, even if the system exit executing flag in the execution space is ON, 3. The abnormal termination exit routine management system according to claim 1, further comprising special forced termination request determination means for transferring control to the program forced termination means. 4. The abnormal termination exit routine management method according to claim 3, further comprising: system resource releasing means for releasing system resources prior to execution of the program forced ending means at the time of special forced termination request. .