1.5 ACP-QIO Attributes Statistics Block
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Figure 1-6 shows the format of the attributes statistics block. Table 1-10 lists the contents of this block.
Table 1-10 Contents of the Statistics Block
Field | Subfields | Meaning |
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SBK$L_STLBN | Contains the starting LBN of the file if the file is contiguous. If the file is not contiguous, this field contains a value of 0. The LBN appears as an inverted longword (the high- and low-order 16 bits are transposed for PDP-11 compatibility). The following subfields are defined: | |
SBK$W_STLBNH | Starting LBN (high-order 16 bits) | |
SBK$W_STLBNL | Starting LBN (low-order 16 bits) | |
SBK$L_FILESIZE | Contains the size of the file in blocks. The file size appears as an inverted longword (the high- and low-order 16 bits are transposed for PDP-11 compatibility). The following subfields are defined: | |
SBK$W_FILESIZH | File size (high-order 16 bits) | |
SBK$W_FILESIZL | File size (low-order 16 bits) | |
SBK$B_ACNT[1] | Access count (low byte). Field is for PDP-11 compatibility. | |
SBK$B_LCNT[1] | Lock count (low byte). Field is for PDP-11 compatibility. | |
SBK$L_FCB | System pool address of the file's file control block. | |
SBK$W_ACNT[1] | Access count (number of channels with file open currently). | |
SBK$W_LCNT[1] | Lock count (the number of access operations that have locked the file against writers). | |
SBK$W_WCN[1] | Writer count (the number of channels that currently have the file open for write). | |
SBK$W_TCNT[1] | Truncate lock count (the number of access operations that have locked the file against truncation). | |
SBK$L_READS | Number of read operations executed for the file on this channel. | |
SBK$L_WRITES | Number of write operations executed for the file on this channel. | |
[1] Accesses from processes on the local node in a cluster are counted. | ||