HP UX 11i v1 I/O Cards manual Zqsze

ZCOM C I/F Library Routines

ZQSZE (3X)

	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	This routine may be called from a multi-threaded application using the
Considerations	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).

266 Chapter 4