HP OpenVMS System Services Reference Manual

For print jobs, the system makes the string available to the symbiont, though the standard OpenVMS print symbiont does not use this information. By default, each of the eight parameters specifies a null string.

For function code SJC$_ALTER_JOB, if any SJC$_PARAMETER item is specified, the value of each unspecified item is the null string.

The SJC$_NO_PARAMETERS item code is a Boolean item code. It specifies that none of the SJC$_PARAMETER items are to be passed in the batch or print job. It is the default.

(Valid for SJC$_ALTER_JOB, SJC$_CREATE_JOB, SJC$_ENTER_FILE function codes)

SJC$_PASSALL

SJC$_NO_PASSALL

The SJC$_PASSALL item code is a Boolean item code. It is meaningful only for jobs submitted to output execution queues. It specifies that the symbiont is to print the file in PASSALL mode.

The SJC$_NO_PASSALL item code is a Boolean item code. It specifies that the symbiont is not to print the file in PASSALL mode. It is the default.

(Valid for SJC$_ADD_FILE, SJC$_ALTER_JOB, SJC$_ENTER_FILE function codes)

SJC$_PRINTER

Boolean item code. It is meaningful only for output queues. It specifies that the queue being created is a printer queue. The SJC$_BATCH, SJC$_PRINTER, SJC$_SERVER, and SJC$_TERMINAL item codes are mutually exclusive. If none of these item codes are specified, the default is SJC$_PRINTER.

(Valid for SJC$_CREATE_QUEUE function code)

SJC$_PRIORITY

Input value item code. The buffer must specify a longword value in the range 0 through 255. This value specifies the scheduling priority of the job in a queue relative to the scheduling priority of other jobs in the same queue.

By default, the scheduling priority of the job is the value of the system parameter DEFQUEPRI.

If you specify a value for SJC$_PRIORITY that is greater than the system parameter MAXQUEPRI and you do not have either ALTPRI or OPER privilege, the system uses the greater of the following two values: DEFQUEPRI or MAXQUEPRI. If you have either ALTPRI or OPER privilege, the system uses any value you specify for SJC$_PRIORITY, even if it is included in the range between MAXQUEPRI + 1 and 255.

(Valid for SJC$_ABORT_JOB, SJC$_ALTER_JOB, SJC$_CREATE_JOB, SJC$_ENTER_FILE function codes)

SJC$_PROCESSOR

SJC$_NO_PROCESSOR

The SJC$_PROCESSOR item code is an input value item code. The buffer must specify a valid OpenVMS RMS file name.

When specified for an output execution queue, SJC$_PROCESSOR specifies that the symbiont image to be executed is SYS$SYSTEM:name.EXE, where name is the RMS file name contained in the buffer.

When specified for a generic output queue, SJC$_PROCESSOR specifies that the generic queue can place jobs only in server queues that are executing the symbiont image SYS$SYSTEM:name.EXE, where name is the RMS file name contained in the buffer.

The SJC$_NO_PROCESSOR item code is a Boolean item code. It specifies that the symbiont image to be executed is SYS$SYSTEM:PRTSMB.EXE. It is the default.

(Valid for SJC$_CREATE_QUEUE, SJC$_START_QUEUE function codes)

SJC$_PROTECTION

Input value item code. It specifies the protection of a queue.

The buffer must specify a longword in the format shown in the following diagram:

Bits 0 through 15 specify the protection value: the four types of access (read, submit, manage, delete) to be granted to the four categories of user (System, Owner, Group, World). Set bits deny access and clear bits allow access.

Bits 16 through 31 specify the protection enable mask: they identify which part of the protection value (bits 0 through 15) is to be applied to queue protection. If all bits are set in the enable mask, it means that all of the protection values are to be applied. A value other than --1 in the protection enable mask means that only those bits set will affect the corresponding bits in the protection value. When a bit in the protection enable mask is clear, the corresponding bit in the existing queue protection value is unchanged.

By default, the queue protection is (S:M,O:D,G:R,W:S).

Note that on all system types you can assign ACLs to queues using the $SET_SECURITY system service.

(Valid for SJC$_ALTER_QUEUE, SJC$_CREATE_QUEUE, SJC$_START_QUEUE function codes)

SJC$_QUEUE

Input value item code. It specifies the queue to which the operation is directed. The buffer must specify the name of the queue.

The string can contain uppercase or lowercase characters (lowercase are converted to uppercase), numeric characters, dollar signs ($), and underscores (_). If the string is a logical name, SYS$SNDJBC translates it iteratively until the equivalence string is found or the maximum number of translations allowed by the system has been performed. The maximum length of the final character string is 31 characters; spaces, tabs, and null characters are ignored.

(The following function codes are valid for SJC$_QUEUE item code:

SJC$_ABORT_JOB
SJC$_ALTER_JOB
SJC$_ALTER_QUEUE
SJC$_CREATE_JOB
SJC$_CREATE_QUEUE
SJC$_DELETE_JOB
SJC$_DELETE_QUEUE
SJC$_ENTER_FILE
SJC$_START_QUEUE
SJC$_SYNCHRONIZE_JOB)

SJC$_QUEUE_DESCRIPTION

SJC$_NO_QUEUE_DESCRIPTION

The SJC$_QUEUE_DESCRIPTION item code is an input value item code. It provides operator-supplied information about the queue. The buffer must specify a string of no more than 255 characters.

The SJC$_NO_QUEUE_DESCRIPTION item code is a Boolean item code. It specifies that no description is associated with the queue.

(Valid for SJC$_ALTER_QUEUE, SJC$_CREATE_QUEUE, SJC$_START_QUEUE function codes)

SJC$_QUEUE_DIRECTORY

Input value item code. SJC$_QUEUE_DIRECTORY specifies the directory location that contains the system queue and journal files for the queue manager. The queue file has a file type of QMAN$QUEUES and contains queue definitions. The journal file has a file type of .QMAN$JOURNAL and contains job and other information allowing the queue manager to return to its last known state should a system be stopped unexpectedly. These files must reside together in the same directory.

The default location of the queue and journal files is SYS$COMMON:[SYSEXE]. The optional use of SJC$_QUEUE_DIRECTORY is for specifying an alternate location for the queue and journal files. The specification must include at least the device and directory name; wildcard characters are not allowed in the directory specification. The directory specified must be available to all nodes that can run the queue manager. If the directory specification is a concealed logical name, it must be defined identically on all nodes in the cluster.

The location of the queue and journal files is stored in the master file of the queue database. You do not have to respecify the directory location with subsequent use of SJC$_START_QUEUE_MANAGER.

For more information, see the HP OpenVMS System Manager's Manual.

(Valid for SJC$_START_QUEUE_MANAGER function code)

SJC$_QUEUE_MANAGER_NAME

Input value item code. It uniquely identifies the queue manager process that manages some segment of the queues and jobs in the system. If it is not present, a default name of SYS$QUEUE_MANAGER is used.

The maximum length of the final character string is 31 characters. As with queue names, this can be a logical and will be resolved by the system. Once resolved, the name provided will serve as the file name for the queue and journal files, the process name, and the user name for the active process. Only the first 15 and 12 characters of the name are used for the process and user names, respectively.

(Valid for SJC$_CREATE_QUEUE, SJC$_DELETE_QUEUE_MANAGER, SJC$_DISABLE_AUTOSTART, SJC$_ENABLE_AUTOSTART, SJC$_START_QUEUE_MANAGER, SJC$_STOP_ALL_QUEUES_ON_NODE, SJC$_STOP_QUEUE_MANAGER function codes)

SJC$_QUEUE_MANAGER_NODES

Input value item code. In an OpenVMS Cluster, SJC$_QUEUE_MANAGER_NODES specifies a list of nodes that can run the queue manager. It also gives the explicit order of failover if the node running the queue manager exits the cluster. The specified node list is stored in the queue database.

The default value for the node list is an asterisk (*); it specifies that all nodes in the cluster are eligible to run the queue manager. The asterisk can also be specified as an element of the list. For example, a list can be specified as nodes A, B, C, *. If the node on which the queue manager is running leaves the cluster, the queue manager automatically fails over to any available node in the cluster; that is, if nodes A, B, and C are unavailable, then the queue manager can run on any other node. When establishing the node list, there is no validation of the individual nodes. If, for example, a node name is misspelled, there is no error status returned.

Anytime the SJC$_START_QUEUE_MANAGER function code is used, the job controller checks the queue database to see if the node list is other than the default (*). If the node list is other than the default and the queue manager is running on a node other than the first available node of those specified, then the queue manager process is moved from its current node and restarted on the first available preferred node. When a current call includes the SJC$_QUEUE_MANAGER_NODES item code, the job controller also updates the node list stored in the database. Despite this transition, queues on the running nodes are not stopped, and all requests to the queuing system complete as expected.

Note that because the specified node list is saved in the database, it is used every time the SJC$_START_QUEUE_MANAGER function code is used, unless the node list has been changed by a more recent call to $SNDJBC with the SJC_$QUEUE_MANAGER_NODES item code.

For more information, see the HP OpenVMS System Manager's Manual.

(Valid for SJC$_START_QUEUE_MANAGER function code)

SJC$_RAD (Alpha and I64)

Input value item code used to specify a RAD number on which to create a batch process. The item accepts a 32-bit integer value as input. The input is validated to be within the range of 0 to SYI$_RAD_MAX_RADS.

Note: OpenVMS support for RADs is available only on the AlphaServer GS series systems. For more information about using RADs, see the HP OpenVMS Alpha Partitioning and Galaxy Guide.

(Valid for SJC$_ALTER_JOB, SJC$_ALTER_QUEUE, SJC$_CREATE_JOB, SJC$_CREATE_QUEUE, SJC$_ENTER_FILE, SJC$_START_QUEUE)

SJC$_RECORD_BLOCKING

SJC$_NO_RECORD_BLOCKING

The SJC$_RECORD_BLOCKING item code is a Boolean item code. It is meaningful only for output execution queues. It specifies that the symbiont can merge the output records it sends to the output device into a single I/O request. For the standard OpenVMS print symbiont, record blocking can have a significant performance advantage over single-record mode. It is the default.

The SJC$_NO_RECORD_BLOCKING item code is a Boolean item code. It specifies that the symbiont must send each record in a separate I/O request to the output device.

(Valid for SJC$_ALTER_QUEUE, SJC$_CREATE_QUEUE, SJC$_START_QUEUE function codes)

SJC$_RELATIVE_PAGE

Input value item code. It is meaningful only for output execution queues. The buffer must specify a signed longword integer. This item code specifies that printing should be resumed after spacing forward (if the buffer value is positive) or backward (if the buffer value is negative) the specified number of pages.

(Valid for SJC$_START_QUEUE function code)

SJC$_REQUEUE

Boolean item code. It specifies that a job is to be requeued. By default, the job is deleted.

(Valid for SJC$_ABORT_JOB function code)

SJC$_RESTART

SJC$_NO_RESTART

The SJC$_RESTART item code is a Boolean item code. It specifies that a job can restart after a system failure or can be requeued during execution. It is the default for print jobs.

The SJC$_NO_RESTART item code is a Boolean item code. It specifies that a job cannot restart after a system failure or after a requeue operation. It is the default for batch jobs.

(Valid for SJC$_ALTER_JOB, SJC$_CREATE_JOB, SJC$_ENTER_FILE function codes)

SJC$_RETAIN_ALL_JOBS

SJC$_RETAIN_ERROR_JOBS

SJC$_NO_RETAIN_JOBS

The SJC$_RETAIN_ALL_JOBS item code is a Boolean item code. It specifies that jobs are to be retained in the queue with a completion status after they have been executed.

The SJC$_RETAIN_ERROR_JOBS item code is a Boolean item code. It specifies that jobs are to be retained only if the job completed unsuccessfully (the job's completion status has the low bit clear).

The SJC$_NO_RETAIN_JOBS item code is a Boolean item code. It specifies that jobs are not to be retained in the queue after they have completed. It is the default.

(Valid for SJC$_ALTER_QUEUE, SJC$_CREATE_QUEUE, SJC$_START_QUEUE function codes)

SJC$_SCSNODE_NAME

Input value item code. It specifies the name of the node for which the command is to execute. The buffer must specify a 1- to 6-character string that matches the value of the system parameter SCSNODE in effect on the target node.

When used with the function codes of SJC$_STOP_ALL_QUEUES_ON_NODE, SJC$_DISABLE_AUTOSTART, and SJC$_ENABLE_AUTOSTART, this item code requests a function on a node other than the node from which the $SNDJBC request is sent.

SJC$_SCSNODE_NAME is meaningful only for execution queues in a cluster environment. By default, the queue executes on the node from which the queue is first started. For an output execution queue, you use the SJC$_DEVICE_NAME item code to specify the name of the device managed by the queue.

(Valid for SJC$_CREATE_QUEUE, SJC$_DISABLE_AUTOSTART, SJC$_ENABLE_AUTOSTART, SJC$_START_QUEUE, SJC$_STOP_ALL_QUEUES_ON_NODE function codes)

SJC$_SEARCH_STRING

Input value item code. It is meaningful only for output execution queues. The buffer must specify a string of no more than 63 characters. This item code specifies that printing is to resume at the page containing the first occurrence of the specified string. The search for the string proceeds in the forward direction.

(Valid for SJC$_START_QUEUE function code)

SJC$_SERVER

Boolean item code. It is meaningful only for output queues. It specifies that the queue being created is a server queue. The term server indicates that a user-modified or user-written symbiont process is controlling an output execution queue, or a generic queue has server execution queues as its targets.

The SJC$_BATCH, SJC$_PRINTER, SJC$_SERVER, and SJC$_TERMINAL item codes are mutually exclusive. If none of these item codes are specified, the default is SJC$_PRINTER.

(Valid for SJC$_CREATE_QUEUE function code)

SJC$_SWAP

SJC$_NO_SWAP

The SJC$_SWAP item code is a Boolean item code. It is meaningful only for batch execution queues. It specifies that jobs initiated from a queue can be swapped. It is the default.

The SJC$_NO_SWAP item code is a Boolean item code. It specifies that jobs in this queue cannot be swapped.

(Valid for SJC$_ALTER_QUEUE, SJC$_CREATE_QUEUE, SJC$_START_QUEUE function codes)

SJC$_TERMINAL

SJC$_NO_TERMINAL

The SJC$_TERMINAL item code is a Boolean item code. It is meaningful only for output queues. It specifies that the queue being created is a terminal queue.

The SJC$_BATCH, SJC$_PRINTER, SJC$_SERVER, and SJC$_TERMINAL item codes are mutually exclusive. If none of these item codes are specified, the default is SJC$_PRINTER.

The SJC$_NO_TERMINAL item code is a Boolean item code. It designates the queue type as printer rather than terminal. It is the default.

For the SJC$_START_QUEUE function code, SJC$_TERMINAL and SJC$_NO_TERMINAL are supported for compatibility with VAX VMS Version 4.n, but might not be supported in the future. For SJC$_CREATE_QUEUE, SJC$_NO_TERMINAL is supported for compatibility with VAX VMS Version 4.n, and might not be supported in the future.

(Valid for SJC$_CREATE_QUEUE, SJC$_START_QUEUE function codes)

SJC$_TOP_OF_FILE

Boolean item code. It is meaningful only for output queues. It specifies that printing is to be resumed at the beginning of the file.

(Valid for SJC$_START_QUEUE function code)

SJC$_UIC

Input value item code. This value specifies the 4-byte UIC of the user on behalf of whom the request is made. By default, the UIC is taken from the requesting process.

(Valid for SJC$_CREATE_JOB, SJC$_ENTER_FILE function codes)

SJC$_USERNAME

Input value item code. It specifies the user name of the user on behalf of whom the request is made. The buffer must specify a string from 1 to 12 characters. By default, the user name is taken from the requesting process.

You need CMKRNL privilege to use this item code.

(Valid for SJC$_CREATE_JOB, SJC$_ENTER_FILE function codes)

SJC$_WSDEFAULT

SJC$_NO_WSDEFAULT

The SJC$_WSDEFAULT item code is an input value item code. It is meaningful only for batch jobs and execution queues. It specifies, in pages (on VAX systems) or pagelets (on Alpha and I64 systems), the default working set size for batch jobs or jobs initiated from a batch queue, or the default working set size of a symbiont process connected to an output queue. A symbiont process can control several output queues; however, the default working set size of the symbiont process is established by the first queue to which it is connected. The buffer must contain a longword integer value in the range 1 through 65,535.

The SJC$_NO_WSDEFAULT item code is a Boolean item code. It specifies that the system is to determine the working set default. It is the default.

For batch jobs, the default working set size, working set quota, and working set extent (maximum size) are included in each user record in the system user authorization file (UAF). You can specify values for these items for individual jobs or for all jobs in a given queue, or for both. Table SYS-56 shows the action taken when you specify a value for SJC$_WSDEFAULT.

Table SYS-56 Working Set Decision Table
Value Specified
for Job? Value Specified
for Queue? Action Taken

No No Use UAF value

No Yes Use value for queue

Yes Yes Use lower of the two

Yes No Compare specified value with UAF value; use lower

**Table SYS-56 Working Set Decision Table**
Value Specified for Job?	Value Specified for Queue?	Action Taken
No	No	Use UAF value
No	Yes	Use value for queue
Yes	Yes	Use lower of the two
Yes	No	Compare specified value with UAF value; use lower

(Valid for SJC$_ALTER_JOB, SJC$_ALTER_QUEUE, SJC$_CREATE_JOB, SJC$_CREATE_QUEUE, SJC$_ENTER_FILE, SJC$_START_QUEUE function codes)

SJC$_WSEXTENT

SJC$_NO_WSEXTENT

The SJC$_WSEXTENT item code is an input value item code. It is meaningful only for batch jobs and execution queues. It specifies, in pages (on VAX systems) or pagelets (on Alpha and I64 systems), the working set extent for batch jobs or jobs initiated from a batch queue, or the working set extent of a symbiont process connected to an output queue. A symbiont process can control several output queues; however, the working set extent of the symbiont process is established by the first queue to which it is connected. The buffer must contain a longword integer value in the range 1 through 65,535.

The SJC$_NO_WSEXTENT item code is a Boolean item code. It specifies that the system determine the working set extent. It is the default.

For information about the action taken when you specify a value for SJC$_WSEXTENT for a batch job or batch queue, see the description of the SJC$_WSDEFAULT item code and to Table SYS-56.

(Valid for SJC$_ALTER_JOB, SJC$_ALTER_QUEUE, SJC$_CREATE_JOB, SJC$_CREATE_QUEUE, SJC$_ENTER_FILE, SJC$_START_QUEUE function codes)

SJC$_WSQUOTA

SJC$_NO_WSQUOTA

The SJC$_WSQUOTA item code is an input value item code. It is meaningful only for batch jobs and execution queues. It specifies, in pages (on VAX systems) or pagelets (on Alpha and I64 systems), the working set quota for batch jobs or default WSQUOTA for jobs initiated from a batch queue, or the working set quota of a symbiont process connected to an output queue. A symbiont process can control several output queues; however, the working set quota of the symbiont process is established by the first queue to which it is connected. The buffer must contain a longword integer value in the range 1 through 65,535.

The SJC$_NO_WSQUOTA item code is a Boolean item code. It specifies that the system is to determine the working set quota. It is the default.

For information about the action taken when you specify a value for SJC$_WSQUOTA for a batch job or batch queue, see the description of the SJC$_WSDEFAULT item code and to Table SYS-56.

(Valid for SJC$_ALTER_JOB, SJC$_ALTER_QUEUE, SJC$_CREATE_JOB, SJC$_CREATE_QUEUE, SJC$_ENTER_FILE, SJC$_START_QUEUE function codes)

Description

The Send to Job Controller service creates, stops, and manages queues and the batch and print jobs in those queues. The $SNDJBC and $GETQUI (Get Queue Information) services together provide the user interface to the queue manager and job controller processes. See the description of the $GETQUI service for a discussion of queues and jobs initiated from those queues.
$SNDJBC completes asynchronously; that is, it returns to the caller after queuing the request, without waiting for the operation to complete.
To synchronize the completion of most operations, you use the Send to Job Controller and Wait ($SNDJBCW) service. The $SNDJBCW service is identical to $SNDJBC in every way except that $SNDJBCW returns to the caller after the operation completes.
Types of Queues

The VMS batch and print queuing system supports several types of queues, which aid in the processing of batch and print jobs. The different types of queues can be divided into three major categories according to the way the system processes the jobs assigned to the queue. The three types of queues are execution, generic, and logical. Execution queues schedule jobs for execution; generic and logical queues transfer jobs to execution queues. Within these major classifications, queue type is further defined by the kinds of job the queues can accept for processing. Some types of execution and generic queues accept batch jobs; other types accept print jobs. Logical queues are restricted to print jobs.
You create a queue by making a call to $SNDJBC specifying the SJC$_CREATE_QUEUE function code. Item codes that you optionally specify in the call determine the type of queue you create. The following list describes the various types of execution, generic, and logical queues and indicates which item codes you need to specify to create them:

Execution queue. An execution queue schedules jobs for processing. In an OpenVMS Cluster environment, jobs are processed on the node that manages the execution queue. There are two types of execution queues:

Batch execution queue. A batch execution queue can schedule only batch jobs for execution. A batch job executes as a detached process that sequentially runs one or more command procedures; you define the list of command procedures as part of the initial job description. You create a batch execution queue by specifying the SJC$_BATCH item code in the call to the $SNDJBC service.
Output execution queue. An output execution queue schedules print jobs for processing by an independent symbiont process associated with the queue. The job controller sends the symbiont a list of files to process; you define this list of files as part of the initial job description. As the symbiont processes each file, it produces output for the device, such as a printer or terminal, that it controls.
The standard print symbiont image provided by the operating system is designed to print files on hardcopy devices. User-modified or user-written symbionts also can be designed for this or any other file processing activity managed by the batch and print queuing system. The symbiont image that executes jobs from an output queue is specified by the SJC$_PROCESSOR item code. If you omit this item code, the standard print symbiont image, PRTSMB, is associated with the queue.
There are three types of output execution queue:

Printer execution queue. This type of queue typically uses the standard print symbiont to direct output to a line printer. You can specify a user-provided symbiont in the SJC$_PROCESSOR item code. You create a printer execution queue by specifying the SJC$_PRINTER item code when you create the output execution queue. A printer execution queue is the default type of output execution queue.
Terminal execution queue. This type of queue typically uses the standard print symbiont to direct output to a terminal printer. You can specify a user-provided symbiont in the SJC$_PROCESSOR item code. You create a terminal execution queue by specifying the SJC$_TERMINAL item code when you create the output execution queue.
Server execution queue. This type of queue uses the user-modified or user-written symbiont you specify in the SJC$_PROCESSOR item code to process the files that belong to jobs in the queue. You create a server execution queue by specifying the SJC$_SERVER item code when you create the output execution queue.

When you create an output execution queue, you can initially mark it as either a printer, terminal, or server execution queue. However, when the queue is started, the symbiont process associated with the queue can change the queue type from the type designated at its creation to a printer, terminal, or server execution queue, as follows:

When an output execution queue associated with the standard print symbiont is started, the symbiont determines whether it is controlling a printer or terminal. It communicates this information to the job controller. If necessary, the job controller then changes the type designation of the output execution queue.
When an output execution queue associated with a user-modified or user-written symbiont is started, the symbiont has the option of identifying the queue to the job controller as a server queue. If the user-written or user-modified symbiont does not notify the job controller that it wants to change the queue type designation, the output execution queue retains the queue type designation it received when it was created.

Generic queue. A generic queue holds a job until an appropriate execution queue becomes available to initiate the job; the job controller then requeues the job to the available execution queue. In a cluster environment, a generic queue can direct jobs to execution queues that are located on other nodes in the cluster.
You create a generic queue by specifying the SJC$_GENERIC_QUEUE item code in the call to the $SNDJBC service. You designate each execution queue to which the generic queue can direct jobs by specifying the SJC$_GENERIC_TARGET item code. Because a generic queue can direct jobs to more than one execution queue, you can specify the SJC$_GENERIC_TARGET item code up to 124 times in a single call to $SNDJBC to define a complete set of execution queues for any generic queue. If you do not specify the SJC$_GENERIC_TARGET item code, the generic queue directs jobs to any execution queue that is the same type of queue as the generic queue; that is, a generic batch queue will direct a job to any available batch execution queue, and so on. There is one exception: a generic queue will not direct work to any execution queue that was created in a call to $SNDJBC that specified the SJC$_NO_GENERIC_SELECTION item code.
There are two types of generic queue:

Generic batch queue. A generic batch queue can direct jobs only to batch execution queues. You create a generic batch queue by specifying both the SJC$_GENERIC_QUEUE and SJC$_BATCH item codes in the call to the $SNDJBC service.
Generic output queue. A generic output queue can direct jobs to any of the three types of output execution queue: printer, terminal, or server. Creating a generic output queue that directs jobs to any combination of the three types of output execution queue is possible. Typically, however, when you create a generic output queue, you specify a list of type-specific target queues. This way, the generic output queue directs jobs to a single type of output execution queue. Thus, you can control whether the jobs submitted to the generic output execution queue are output on a line printer or a terminal printer or are sent to a server symbiont for processing. You create a generic output queue by specifying the SJC$_GENERIC_QUEUE item code in the call to the $SNDJBC service.

Logical queue. A logical queue performs the same function as a generic output queue, except that a logical queue can direct jobs to only a single printer, terminal, or server execution queue. A logical queue is only an output queue that has been assigned to transfer its jobs to one execution queue.
To change an output queue into a logical queue, you make a call to the $SNDJBC service while the output queue is in a stopped state. The call must specify the SJC$_ASSIGN_QUEUE function code and the SJC$_DESTINATION_QUEUE item code. You use the SJC$_DESTINATION_QUEUE item code to specify the execution queue to which the logical queue should direct jobs. When the logical queue is started, it automatically requeues its jobs to the specified execution queue as that execution queue becomes available. You can change a logical queue back to its original output queue definition by specifying the SJC$_DEASSIGN_QUEUE function code in a subsequent call to the $SNDJBC service.

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