Scenario 1:
SUSPEND RB=PREVIOUS
- Type 2 SVC routine receives control from a macro issuer.
- The SVC routine suspends (through SUSPEND) the macro issuer's RB.
- The process that will eventually issue the RESUME is started.
- The SVC completes processing and exits.
- Event completion occurs; process started in step 3 resumes (through RESUME) the issuer of the macro.
- The macro issuer's task resumes (at return from the SVC routine).