Reference Guide

ZCOM C I/F Library Routines
ZQSZE (3X)
Chapter 4292
ZQSZE (3X)
NAME zqsze – Read ZLU input queue size
SYNOPSIS
#include <zcom/zcomsys.h>
#include <zcom/zcomcall.h> /* if compiled with ANSI C (recommended) */
int32 zqsze (zap, zqhdp)
zaddr_type *zap;
zqhd_type *zqhdp;
DESCRIPTION Routine zqsze will return the queue header information, which includes
the number of messages, i.e., the number of buffers (zqhd_type->qnmsg)
queued to the specified program ZLU. An error is returned if the ZLU is
not a program ZLU.
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).