Reference Guide

ZCOM C I/F Library Routines
ZSETQL (3X)
Chapter 4316
ZSETQL (3X)
NAME zsetql – Set buffer queue limit
SYNOPSIS
#include <zcom/zcomsys.h>
#include <zcom/zcomcall.h> /* if compiled with ANSI C (recommended) */
int32 zsetql (zap, mode, qnum, limit)
zaddr_type *zap;
uint32 mode;
uint32 qnum;
uint32 limit;
DESCRIPTION Routine zsetql changes the pre-set queue limit of a buffer queue (the
pre-set value is configured in the TTGEN configuration file). This allows
the caller to adjust the input/output characteristics of some of the ZLUs
in the ZCOM subsystem without restarting the ZCOM subsystem or
affecting other ZLUs.
The libraries libzcom_c.a and libpthread.a must be linked into the calling
program by giving the options “-lzcom_c -lpthread” to cc(1) or ld(1).
Threads
Considerations
This routine may be called from a multi-threaded application using the
POSIX (1003.1c) kernel threads API package. This routine has the
following characteristics when called by a multi-threaded application:
cancellation point Thread cancellation can occur when a thread
calls this routine.
async-cancel unsafe The calling thread’s cancelability type must be
PTHREAD_CANCEL_DEFERRED if
cancellation is enabled.
async-signal unsafe It cannot be called from a signal handler.
fork unsafe It cannot be called by a child process after
fork(2) but before exec(2).