Reference Guide

ZCOM Tables and Data Structures
ZCOM Kernel Data
Chapter 3 133
LINFO
The LINFO structure (Lock Information, struct zlinfo) contains the
ZCOM locks used globally in the ZCOM subsystem. It is initialized by
the LDM during system bootup. The locks are used to provide exclusive
access to the sharable data structures in the ZCOM subsystem. The
fields are described in Table 3-51.
ZC_GLOCK - Global spinlock
This is the highest lock order in the ZCOM subsystem. It protects the
ZCOM system header zheader_type in global memory (with some
exception, see ZC_RLOCK below), and the LDM static data such as the
interface request queue and ZCOM message log buffer.
ZC_MLOCK - Memory pool spinlock
This protects the ZCOM buffer pool. Used in buffer management
routines, such as buffer allocation and buffer freeing.
ZC_RLOCK - Remote ZLU spinlock
This lock protects the following ZCOM system header data fields. They
are connected with remote nodes or remote API processing:
hrdataq, hpntbl, hndpid, hndsig, hndmax, hnidle, hnhigh, hnlow, hnwait
Table 3-51 LINFO Structure Fields
Field Name Field Description Field Type
Size
(Bytes)
ZC_GLOCK Global spinlock struct 16
ZC_MLOCK Memory spinlock struct 16
ZC_RLOCK Remote ZLU spinlock struct 16
ZC_SLOCK Super IFT spinlock struct 16