Call Pause to make the current task nondispatchable. Once you pause a task, it remains nondispatchable until a Release service specifying the same PET is called. That is, the program issuing the Pause does not receive control back until after the Release occurs.
If a Release service specifying the same PET is called before Pause, the system returns control immediately to the calling program, and the task is not paused.
When you use Pause, it returns an updated PET; you use this updated PET to either deallocate or reuse the PE.
The requirements for the caller are:
| Environmental factor | Requirement |
|---|---|
| Minimum authorization: | Problem state and any PSW key. |
| Dispatchable unit mode: |
|
| Cross memory mode: |
|
| AMODE: | 31-bit addressing mode. |
| ASC mode: | Primary mode. |
| Interrupt status: | Enabled for I/O and external interrupts |
| Locks: | No locks held. |
| Control parameters: | Must be in the primary address space and addressable by the caller. |
Either link the calling program's object code with the linkable stub routine (IEACSS from SYS1.CSSLIB), or load the calling program and then call the service. The high-level language (HLL) definitions for the callable service are:
| HLL Definition | Description |
|---|---|
| IEAASM | 390 Assembler declarations |
| IEAC | C/390 and C++/390 declarations |
When the calling program is running auth_level=IEA_UNAUTHORIZED, the caller must be in task mode and can only pause another task in its home address space. All pause element tokens (PETs) used when auth_level=IEA_UNAUTHORIZED must have been obtained using an authorization level of IEA_UNAUTHORIZED.
Some callers depend on register contents remaining the same before and after issuing a service. If the system changes the contents of registers on which the caller depends, the caller must save them before issuing the service, and restore them after the system returns control.
None.
| Syntax | Description |
|---|---|
| CALL IEAVPSE | |
The parameters are explained as follows:
Contains the return code from the Pause service.
Indicates the maximum level that the specified pause element was allocated with. IEAASM and IEAC define constants IEA_UNAUTHORIZED and IEA_AUTHORIZED, which the calling program can use. The following levels are supported:
| Variable | Value (HEX) | Meaning |
|---|---|---|
| IEA_UNAUTHORIZED | 0 | The pause element being paused must have been allocated with auth_level=IEA_UNAUTHORIZED. |
| IEA_AUTHORIZED | 1 | The pause element being paused must have been allocated with auth_level=IEA_AUTHORIZED. |
A pause element token that identifies the pause element being used to pause the current task. You obtain the PET from the Allocate_Pause_Element service.
Once you use a PET in a call to the Pause service, you cannot reuse the PET on a second call to Pause or on a call to Transfer. The Pause service returns a new PET in updated_pause_element_token. The new PET now identifies the pause element used to Pause the task; use the new PET the next time you make a Pause request using the same Pause element.
A new pause element token that identifies the pause element originally identified by the PET specified in pause_element_token, which cannot be reused after a successful call to Pause.
The release code, specified by the issuer of the Release service. A Release that specified this code released the task from its paused condition.
| Abend Code | Reason Code | Description |
|---|---|---|
| AC7 | 001A0001 | This is an internal error. Contact IBM® support. |
When the service returns control to your program, GPR 15 contains one of the following return codes:
Return code in: |
Meaning and Action |
|---|---|
| 00 (00) IEA_SUCCESS |
Meaning: Successful completion. Action: None |
| 04 (04) | Meaning: Program error.
The specified pause element token is not valid. The system rejects
the service call. Action: Check the calling program for a probable coding error. Correct the program and rerun it. |
| 08 (08) IEA_PE_TOKEN_STALE |
Meaning: The specified pause
element token is stale; that is, it was valid but has been used on
the Pause or Transfer service. This service requires the updated PET
be returned on Pause or Transfer. Action: Check the calling program for a probable coding error. Correct the program and rerun it. |
| 12 (0C) IEA_DUPLICATE_PAUSE |
Meaning: The work unit has
already been paused using the specified pause element token. The
system rejects the service call. Action: Check the calling program for a probable coding error. Correct the program and rerun it. |
| 24 (18) IEA_LOCK_HELD |
Meaning: Program error.
The caller is holding one or more locks; no locks must be held. The
system rejects the service call. Action: Check the calling program for a probable coding error. Correct the program and rerun it. |
| 32 (20) IEA_PE_BAD_STATE |
Meaning: Program
error. The pause element associated with the pause element token
specified in the call is not in a valid state. The system rejects
the service call. Action: Check the calling program for a probable coding error, such as attempting to perform a Pause or Transfer using a pause element token that has already been used to Pause or Transfer by another unit of work. Correct the program and rerun it. |
| 36 (24) IEA_UNSUPPORTED_MVS_RELEASE |
Meaning: Environmental error.
The system release does not support this service. The system rejects
the service call. Action: Run the program on a system that supports the service. |
| 40 (28) IEA_INVALID_AUTHCODE |
Meaning: Program error.
The auth_level value specified in the call is not valid. The
system rejects the service call. Action: Check the calling program for a probable coding error. Correct the program and rerun it. |
| 44 (2C) IEA_INVALID_MODE |
Meaning: Program error.
The calling program is not in primary ASC mode, which this service
requires. The system rejects the service call. Action: Check the calling program for a probable coding error. Correct the program and rerun it. |
| 52 (34) IEA_ALREADY_SUSPENDED |
Meaning: The pause element
was already paused. Action: Check the calling program for a probable coding error and correct the program and rerun it. |
| 60 (3C) IEA_AUTH_TOKEN |
Meaning: Program error.
The caller specified auth_level=UNAUTHORIZED, but the pause element
token was allocated with auth_level=AUTHORIZED. The system rejects
the service call. rejects the service call. Action: Program error. The specified pause element token is not valid. The system rejects the service call. |
| 64 (40) IEA_PE_NOT_HOME |
Meaning: Program error.
The caller specified auth_level=UNAUTHORIZED, but the pause element
token was for a pause element allocated to another address. Action: Check the calling program for a probable coding error. Correct the program and rerun it. |
| 4095 (FFF) IEA_UNEXPECTED_ERROR |
Meaning: This service routine
encountered an unexpected error. The system rejects this service
request. Action: Contact IBM support. |