Change Job Interrupt Status (QWCCJITP) API

The Change Job Interrupt Status (QWCCJITP) API will retrieve and optionally modify the job interrupt status of the current job. For additional information, see Usage Notes.

Authorities and Locks

None

Required Parameter Group

Current job interrupt status

OUTPUT; CHAR(1)

The variable that is used to return the current job interrupt status. The possible values are:

0	The current job is uninterruptible.
1	The current job is interruptible.

New job interrupt status

INPUT; CHAR(1)

The variable that is used to specify the new job interrupt status. The possible values are:

0	The current job is uninterruptible.
1	The current job is interruptible.
*	The job interrupt status is not modified.

Error code

I/O; CHAR(*)

The structure in which to return error information. For the format of the structure, see Error Code Parameter.

Usage Notes

Considerations for Thread Safety

The conditions under which this API is threadsafe are as follows:

• Changing the job interrupt status of the current job from the primary thread of the job.

The conditions under which this API is not threadsafe are as follows:

• Changing the job interrupt status of the current job from a secondary thread of the job. Invocations of this API from secondary threads run asynchronous to interruptions occurring in the primary thread and can interfere with the interruption control being manipulated by the primary thread.
  
  
• When multiple threads in the same job are concurrently retrieving and optionally modifying the job interrupt status, the results can be unpredictable.

Considerations for Job Interruptibility

For a job to be interrupted, the system must allow jobs to be interrupted. The Allow jobs to be interrupted (QALWJOBITP) system value determines if the system will allow jobs to be interrupted. For all new jobs becoming active, the QALWJOBITP system value is used to determine the initial value for the job interrupt status for that job.

The Change Job Interrupt Status (QWCCJITP) API will retrieve and optionally modify the job interrupt status of the current job. If the job is currently uninterruptible, any program called by the Call Job Interrupt Program (QWCJBITP) API will not be able to run in this job. When the job is modified to be interruptible, programs called by the QWCJBITP API will be able to interrupt and run in this job.

Error Messages