shmem_startup_hook

中文定义与说明

此时允许可加载模块设置其共享内存分配。

以下中文为本站依据所列 PostgreSQL 源码注释编译的说明。

接口声明

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

调用位置

• src/backend/storage/ipc/ipci.c:191
• src/backend/storage/ipc/ipci.c:249

核心调用上下文：src/backend/storage/ipc/ipci.c:185–199

	CreateOrAttachShmemStructs();

	/*
	 * Now give loadable modules a chance to set up their shmem allocations
	 */
	if (shmem_startup_hook)
		shmem_startup_hook();
}
#endif

/*
 * CreateSharedMemoryAndSemaphores
 *		Creates and initializes shared memory and semaphores.
 */
void

核心调用上下文：src/backend/storage/ipc/ipci.c:243–257

	dsm_postmaster_startup(shim);

	/*
	 * Now give loadable modules a chance to set up their shmem allocations
	 */
	if (shmem_startup_hook)
		shmem_startup_hook();
}

/*
 * Initialize various subsystems, setting up their data structures in
 * shared memory.
 *
 * This is called by the postmaster or by a standalone backend.
 * It is also called by a backend forked from the postmaster in the