D.1.3.1 Data Structures
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D.1.3.1 Data Structures

SRCU's data structures are shown in Figure , and are depicted schematically in Figure . The completed field is a count of the number of grace periods since the struct srcu was initialized, and as shown in the diagram, its low-order bit is used to index the struct srcu_struct_array. The per_cpu_ref field points to the array, and the mutex field is used to permit but one synchronize_srcu() at a time to proceed.

Figure: SRCU Data Structures

Figure: SRCU Data-Structure Diagram