Op Code (Hex) | Operand 1 | Operand 2 | ||
---|---|---|---|---|
032E | Receiver | Record selection template |
Operand 2: Space pointer.
Bound program access |
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The locks currently allocated on the specified data space record are materialized.
The current lock status of the data space record identified by the template in operand 2 is materialized into the space identified by operand 1.
The record selection template identified by operand 2 must be
16-byte aligned. The format of the record selection template
is as follows.
Offset | |||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec | Hex |
| Field Name |
| Data Type and Length | ||||||||||||
0 | 0 |
| Record selection |
| Char(24) | ||||||||||||
0 | 0 |
| Data space identification |
| System pointer | ||||||||||||
16 | 10 |
| Record number |
| UBin(4) | ||||||||||||
20 | 14 |
| Reserved |
| Char(4) | ||||||||||||
24 | 18 |
| Lock selection |
| Char(1) | ||||||||||||
24 | 18 |
| Materialize data space locks held |
| Bit 0 | ||||||||||||
|
|
|
| ||||||||||||||
24 | 18 |
| Materialize data space locks waited for |
| Bit 1 | ||||||||||||
|
|
|
| ||||||||||||||
24 | 18 |
| Reserved |
| Bits 2-7 | ||||||||||||
25 | 19 |
| Template options |
| Char(1) | ||||||||||||
25 | 19 |
| Format for number of locks |
| Bit 0 | ||||||||||||
|
|
|
| ||||||||||||||
25 | 19 |
| Reserved |
| Bits 1-7 | ||||||||||||
26 | 1A |
| Reserved |
| Char(6) | ||||||||||||
32 | 20 |
| --- End --- |
|
|
The data space identification must be a system pointer to a data space.
The record number is a relative record number within that data space. If the record number is zero then all locks on the specified data space will be materialized. If the record number is not valid for the specified data space a template value invalid (hex 3801) exception is signaled.
Both of the fields specified under lock selection are bits which determine the locks to be materialized. If the materialize data space locks held is materialize, the current holders of the specified data space record lock are materialized. If the materialize data space locks waited for is materialize, process information is materialized for any thread contained in the process that is waiting to lock the specified data space record.
The format for number of locks bit determines the format of the number of locks held and number of locks waited for fields in the materialization template. If the bit is set to binary 1 then Bin(4) counts are used, else Bin(2) counts are used.
The materialization template identified by operand 1 must be 16-byte
aligned. The format of the materialization is as follows:
Offset | |||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec | Hex |
| Field Name |
| Data Type and Length | ||||||||||||||
0 | 0 |
| Materialization size specification |
| Char(8) | ||||||||||||||
0 | 0 |
| Number of bytes provided for materialization |
| Bin(4) | ||||||||||||||
4 | 4 |
| Number of bytes available for materialization |
| Bin(4) | ||||||||||||||
8 | 8 |
| Materialization data (2 possible formats) |
| Char(8) | ||||||||||||||
|
|
|
| ||||||||||||||||
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|
|
If format for number of locks bit=1
| ||||||||||||||||
8 | 8 |
| Number of lock held descriptions |
| Bin(4) | ||||||||||||||
12 | C |
| Number of lock waited for descriptions |
| Bin(4) | ||||||||||||||
16 | 10 |
| --- End of bit=1 --- |
|
| ||||||||||||||
|
|
|
If format for number of locks bit=0
| ||||||||||||||||
8 | 8 |
| Number of lock held descriptions |
| UBin(2) | ||||||||||||||
10 | A |
| Number of lock waited for descriptions |
| UBin(2) | ||||||||||||||
12 | C |
| Reserved |
| Char(4) | ||||||||||||||
16 | 10 |
| --- End of bit=0 --- |
|
| ||||||||||||||
16 | 10 |
| Lock held descriptions |
| [*] Char(32) | ||||||||||||||
|
|
|
(repeated number of lock held descriptions times)
| ||||||||||||||||
16 | 10 |
| Lock holder |
| System pointer | ||||||||||||||
32 | 20 |
| Record number |
| UBin(4) | ||||||||||||||
36 | 24 |
| Lock state |
| Char(1) | ||||||||||||||
|
|
|
All other values are reserved. | ||||||||||||||||
37 | 25 |
| Lock holder information |
| Char(1) | ||||||||||||||
37 | 25 |
| Lock scope object type |
| Bit 0 | ||||||||||||||
|
|
|
| ||||||||||||||||
37 | 25 |
| Lock scope |
| Bit 1 | ||||||||||||||
|
|
|
| ||||||||||||||||
37 | 25 |
| Reserved |
| Bits 2-7 | ||||||||||||||
38 | 26 |
| Reserved (binary 0) |
| Char(2) | ||||||||||||||
40 | 28 |
| Thread ID |
| Char(8) | ||||||||||||||
* | * |
| Lock waited for descriptions |
| [*] Char(32) | ||||||||||||||
|
|
|
(repeated number of lock waited for descriptions times)
| ||||||||||||||||
* | * |
| Process control space |
| System pointer | ||||||||||||||
* | * |
| Record number |
| UBin(4) | ||||||||||||||
* | * |
| Lock state requested |
| Char(1) | ||||||||||||||
|
|
|
All other values are reserved. | ||||||||||||||||
* | * |
| Lock waiter information |
| Char(1) | ||||||||||||||
* | * |
| Lock scope object type |
| Bit 0 | ||||||||||||||
|
|
|
| ||||||||||||||||
* | * |
| Lock scope |
| Bit 1 | ||||||||||||||
|
|
|
| ||||||||||||||||
* | * |
| Reserved |
| Bits 2-7 | ||||||||||||||
* | * |
| Reserved |
| Char(2) | ||||||||||||||
* | * |
| Thread ID |
| Char(8) | ||||||||||||||
* | * |
| --- End --- |
|
|
The first 4 bytes of the materialization identify the total number of bytes provided for use by the instruction. This value is supplied as input to the instruction and is not modified by the instruction. A value of less than 8 causes the materialization length invalid (hex 3803) exception to be signaled.
The second 4 bytes of the materialization identify the total number of bytes available to be materialized. The instruction materializes as many bytes as can be contained in the area specified as the receiver. If the byte area identified by the receiver is greater than that required to contain the information requested, the excess bytes are unchanged. No exceptions are signaled in the event that the receiver contains insufficient area for the materialization, other than the materialization length exception described previously.
The number of lock held descriptions contains the number of locks held. A system pointer to the lock holder (the object that holds the lock), the relative record number which is locked, and the lock state are materialized in the area identified as lock held descriptions. The lock holder can be either a process control space (PCS) or a transaction control structure. The object type is determined by the value of the lock scope object type field. When lock scope has a value of lock is scoped to the thread, the thread ID field identifies the thread that holds the lock. Otherwise it is set to binary 0. These fields contain data only if materialize data space locks held is materialize.
The number of lock waited for descriptions contains the number of locks being waited for. A system pointer to the process control space (PCS) for each thread waiting for a lock, the relative record number, and the lock state which the thread is waiting for are materialized in the area identified as lock waited for descriptions. The process control space and the thread ID fields will identify the thread that is waiting for the lock, regardless of the lock scope value. These fields contain data only if materialize data space locks waited for is materialize.
A database weak record lock is only acquired thread-scoped and it only conflicts with update record locks which are thread-scoped to a different thread. The weak record lock does not conflict in any other situation.
If UBin(2) fields are requested for the number of lock held descriptions and number of lock waited for descriptions, then the maximum number that can be returned in each count is 32,767. If the actual number is greater than 32,767 for a number then that number will be set to 32,767, only the first 32,767 locks will be materialized and no exception will be signaled.
06 Addressing
08 Argument/Parameter
0A Authorization
10 Damage Encountered
1A Lock State
1C Machine-Dependent
20 Machine Support
22 Object Access
24 Pointer Specification
2E Resource Control Limit
32 Scalar Specification
36 Space Management
38 Template Specification
44 Protection Violation