Experimental Physics and
Industrial Control System

"Liyu, Andrei" <[email protected]> · Tue, 30 Mar 2004 12:05:28 -0500

Hi,

I try to do simple client with couple thread.

============================
static void vFThreadFunction(){
	printf("Thread start\n");
	struct ca_client_context * pSca_client_context;
	pSca_client_context = ca_current_context();//*************
SECOND PLACE
	if( pSca_client_context == NULL){
		printf("No CA context.\n");
		return;
	}
}

main(){
	printf( "Initialize CA\n");
	iStatus = ca_context_create( ca_enable_preemptive_callback);
	if( iStatus != ECA_NORMAL) printf( "%s\n", ca_message( iStatus)
);

	struct ca_client_context * pSca_client_context;
	pSca_client_context = ca_current_context();//************* FIRST
PLACE

	aServerThreadId = epicsThreadCreate( "Auxualury thread",
epicsThreadPriorityMedium, 
			epicsThreadStackMedium, ( EPICSTHREADFUNC)
vFThreadFunction, NULL);
	if( aServerThreadId == 0) printf( "Thread couldn't start.\n");
	epicsThreadSleep( 10); 

	.....
====================================
In first place pSca_client_context != NULL.
In second place pSca_client_context = NULL.

So should I prepare pointer (pSca_client_context) in basic thread
and then auxiliary thread uses it?

Second question.
I open channel to PV in basic thread and have chid chidChannelToPV. I
can use it in auxiliary thread too. Am I right?

Thanks, Andrei.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System