79 lines
1.8 KiB
C++
79 lines
1.8 KiB
C++
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#include "cadef.h"
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#include <stdio.h>
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#include <limits.h>
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#include "cadef.h"
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#include "dbDefs.h"
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#include "tsStamp.h"
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/*
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* event_handler()
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*/
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void eventCallBack ( struct event_handler_args args )
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{
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unsigned *pCount = static_cast < unsigned * > ( args.usr );
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(*pCount)++;
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}
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/*
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* cam ()
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*/
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void caEventRate ( const char *pName )
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{
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static const double initialSamplePeriod = 1.0;
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static const double maxSamplePeriod = 60.0;
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chid chan;
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int status = ca_search ( pName, &chan );
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SEVCHK(status, NULL);
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unsigned eventCount = 0u;
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status = ca_add_event ( DBR_FLOAT, chan, eventCallBack, &eventCount, NULL);
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SEVCHK ( status, __FILE__ );
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status = ca_pend_io ( 10.0 );
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if ( status != ECA_NORMAL ) {
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printf ( "%s not found\n", pName );
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return;
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}
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// let the first one go by
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while ( eventCount < 1u ) {
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status = ca_pend_event ( 0.01 );
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if ( status != ECA_TIMEOUT ) {
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SEVCHK ( status, NULL );
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}
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}
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double samplePeriod = initialSamplePeriod;
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while ( true ) {
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unsigned nEvents, lastEventCount, curEventCount;
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lastEventCount = eventCount;
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status = ca_pend_event ( samplePeriod );
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curEventCount = eventCount;
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if ( status != ECA_TIMEOUT ) {
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SEVCHK ( status, NULL );
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}
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if ( curEventCount >= lastEventCount ) {
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nEvents = curEventCount - lastEventCount;
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}
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else {
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nEvents = ( UINT_MAX - lastEventCount ) + curEventCount +1u;
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}
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printf ( "CA Channel \"%s\" is producing %g subscription update events per second.\n",
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pName, nEvents / samplePeriod );
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if ( samplePeriod < maxSamplePeriod ) {
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samplePeriod += samplePeriod;
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}
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}
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}
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