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Now give loadable modules a chance to set up their shmem allocations

此版本暂无所选语言的定义，以下显示原始英文内容。

Interface type

shmem_startup_hook_type

Header

src/include/storage/ipc.h

Subsystem

Startup and shared memory

Initial value

NULL (no hook installed)

signature

typedef void (*shmem_startup_hook_type) (void); extern PGDLLIMPORT shmem_startup_hook_type shmem_startup_hook;