Halt condition routine

The halt condition routine, IRXHLT, lets you query or reset the halt condition. Using IRXHLT, you can determine whether a halt condition has been set, for example, with the HI immediate command. You can also reset the halt condition.

A program can access IRXHLT using either the CALL or LINK macro instructions, specifying IRXHLT as the entry point name. You can obtain the address of the IRXHLT routine from the REXX vector of external entry points. Format of the REXX vector of external entry points describes the vector.

If a program uses IRXHLT, it must create a parameter list and pass the address of the parameter list in register 1.

Environment Customization Considerations: If you use the IRXINIT initialization routine to initialize language processor environments, you can specify the environment in which you want IRXHLT to run. On the call to IRXHLT, you can optionally specify the address of the environment block for the environment in either the parameter list or in register 0.

For more information about specifying environments and how routines determine the environment in which to run, see Specifying the address of the environment block.