Open System Services System Calls Reference Manual (G06.29+, H06.08+, J06.03+)

SPT_WRITEUPDATEUNLOCKX(2) OSS System Calls Reference Manual
NAME
SPT_WRITEUPDATEUNLOCKX - Performs random processing of records in a disk file
LIBRARY
G-series native OSS processes: /G/system/sysnn/zsptsrl
H-series OSS processes: /G/system/zdllnnn/zsptdll
SYNOPSIS
[#include <cextdecs.h>]
#include <spthread.h>
short SPT_WRITEUPDATEUNLOCKX (
short filenum,
char *buffer,
unsigned short write_count,
[unsigned short *count_written],
[long tag ]
);
PARAMETERS
filenum specifies the file number of a Guardian file open instance that identifies the file to
be written.
buffer specifies an array in the application process in which the information to be writ-
ten to the file is stored before the call.
write_count specifies the number of bytes to be written.
count_written returns a count of the number of bytes written to the file from buffer.
tag is for nowait I/O only. The tag value you define uniquely identifies the operation
associated with this call.
This parameter is supported only for program compatibility; if you provide it, it
is ignored.
DESCRIPTION
The SPT_WRITEUPDATEUNLOCKX() function is the thread-aware version of the Guardian
WRITEUPDATEUNLOCKX procedure.
The SPT_WRITEUPDATEUNLOCKX() function performs random processing of records in a
Guardian disk file. SPT_WRITEUPDATEUNLOCKX() has two purposes:
• To alter, then unlock, the contents of the record at the current position
• To delete the record at the current position in a key-sequenced or relative file
A call to SPT_WRITEUPDATEUNLOCKX() is equivalent to a call to
SPT_WRITEUPDATEX() followed by a call to SPT_UNLOCKREC( ). However, the
SPT_WRITEUPDATEUNLOCKX() function requires less system processing than do the
separate calls to SPT_WRITEUPDATEX() and SPT_UNLOCKREC( ).
For programming information about the WRITEUPDATEUNLOCKX procedure, see the
Enscribe Programmer’s Guide and the Guardian Programmer’s Guide.
7−456 Hewlett-Packard Company 527186-023