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ABCs of z/OS System Programming: Volume 5 by Thomas Stoeckel, Valeria Sokal, Redelf Janssen, Andreas Horn, Luiz Fadel, Paola Bari, Alvaro Salla, Paul Rogers

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Global resource serialization (GRS)
In a multitasking, multiprocessing environment, resource serialization is the technique used to coordinate access to resources that are used by more than one application task. When multiple users share data, a way to control access to that data is needed. Users that update data, for example, need exclusive access to that data. If several users try to update the same data at the same time, the result is data corruption. In contrast, users who only read data can safely access the same data at the same time.
Global ...

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