/* Shared-memory state for a dynamic shared memory segment. */
typedef struct dsm_control_item
{
	dsm_handle handle;
	uint32 refcnt;				  /* 2+ = active, 1 = moribund, 0 = gone */
	void *impl_private_pm_handle; /* only needed on Windows */
	bool pinned;
} dsm_control_item;

/* Layout of the dynamic shared memory control segment. */
typedef struct dsm_control_header
{
	uint32 magic;
	uint32 nitems;
	uint32 maxitems;
	dsm_control_item item[FLEXIBLE_ARRAY_MEMBER];
} dsm_control_header;

static dsm_control_header *dsm_control;