To use global resource serialization latch manager services, you issue CALLs from high level language programs. Each service requires a set of parameters coded in a specific order on the CALL statement.

This topic describes the CALL statements that invoke latch manager services. Each description includes a syntax diagram, parameter descriptions, and return and reason code explanations with recommended actions. Return and reason codes are shown in hexadecimal and decimal, along with the associated equate symbol.

For information about the basic function of the latch manager, how to plan to use the latch manager, and how to use the latch manager callable services, see the serialization topic in z/OS MVS Programming: Authorized Assembler Services Guide.