84 lines
2.3 KiB
C++
84 lines
2.3 KiB
C++
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/*
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* $Id$
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* Auther Jeff Hill
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*/
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#include "epicsMutex.h"
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#include "tsFreeList.h"
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#include "epicsSingleton.h"
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#include "cadef.h" // this can be eliminated when the callbacks use the new interface
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#include "db_access.h" // should be eliminated here in the future
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#define epicsExportSharedSymbols
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#include "db_access_routines.h"
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#include "dbCAC.h"
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dbServiceIOReadNotifyCache::dbServiceIOReadNotifyCache () :
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readNotifyCacheSize ( 0 ), pReadNotifyCache ( 0 )
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{
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}
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dbServiceIOReadNotifyCache::~dbServiceIOReadNotifyCache ()
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{
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delete this->pReadNotifyCache;
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}
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void dbServiceIOReadNotifyCache::show ( unsigned level ) const
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{
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if ( level > 0 ) {
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printf ( "\tget call back cache location %p, and its size %lu\n",
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static_cast <void *> ( this->pReadNotifyCache ),
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this->readNotifyCacheSize );
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}
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}
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// extra effort taken here to not hold the lock when caslling the callback
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void dbServiceIOReadNotifyCache::callReadNotify ( struct dbAddr &addr,
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unsigned type, unsigned long count, cacReadNotify ¬ify )
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{
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epicsGuard < epicsMutex > locker ( this->mutex );
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unsigned long size = dbr_size_n ( type, count );
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if ( type > INT_MAX ) {
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notify.exception ( ECA_BADTYPE,
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"type code out of range (high side)",
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type, count );
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return;
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}
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if ( count > static_cast<unsigned>(INT_MAX) ||
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count > static_cast<unsigned>(addr.no_elements) ) {
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notify.exception ( ECA_BADCOUNT,
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"element count out of range (high side)",
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type, count);
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return;
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}
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if ( this->readNotifyCacheSize < size) {
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char * pTmp = new char [size];
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if ( ! pTmp ) {
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notify.exception ( ECA_ALLOCMEM,
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"unable to allocate callback cache",
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type, count );
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return;
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}
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delete [] this->pReadNotifyCache;
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this->pReadNotifyCache = pTmp;
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this->readNotifyCacheSize = size;
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}
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int status = db_get_field ( &addr, static_cast <int> ( type ),
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this->pReadNotifyCache, static_cast <int> ( count ), 0 );
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if ( status ) {
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notify.exception ( ECA_GETFAIL,
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"db_get_field() completed unsuccessfuly",
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type, count);
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}
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else {
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notify.completion ( type, count, this->pReadNotifyCache );
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}
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}
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