Janet B. Anderson
109 lines
2.8 KiB
C++
109 lines
2.8 KiB
C++
/*************************************************************************\
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* Copyright (c) 2002 The University of Chicago, as Operator of Argonne
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* National Laboratory.
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* Copyright (c) 2002 The Regents of the University of California, as
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* Operator of Los Alamos National Laboratory.
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* EPICS BASE Versions 3.13.7
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* and higher are distributed subject to a Software License Agreement found
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* in file LICENSE that is included with this distribution.
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\*************************************************************************/
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/*
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* $Id$
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*
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*
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* L O S A L A M O S
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* Los Alamos National Laboratory
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* Los Alamos, New Mexico 87545
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*
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* Copyright, 1986, The Regents of the University of California.
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*
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*
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* Author Jeff Hill
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* johill@lanl.gov
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* 505 665 1831
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*/
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#define epicsExportSharedSymbols
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#include "epicsMutex.h"
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#include "epicsSingleton.h"
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#include "epicsGuard.h"
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#include "epicsOnce.h"
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#include "tsFreeList.h"
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class epicsOnceImpl : public epicsOnce {
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public:
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epicsOnceImpl ( epicsOnceNotify & notifyIn );
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void * operator new ( size_t size );
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void operator delete ( void * pCadaver, size_t size );
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private:
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epicsOnceNotify & notify;
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bool onceFlag;
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void destroy ();
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void once ();
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static epicsSingleton < epicsMutex > pMutex;
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static epicsSingleton < tsFreeList < class epicsOnceImpl, 16 > > pFreeList;
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};
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#ifdef _MSC_VER
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# pragma warning ( push )
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# pragma warning ( disable:4660 )
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#endif
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template class epicsSingleton < epicsMutex >;
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template class tsFreeList < class epicsOnceImpl, 16 >;
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template class epicsSingleton < tsFreeList < class epicsOnceImpl, 16 > >;
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#ifdef _MSC_VER
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# pragma warning ( pop )
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#endif
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epicsSingleton < epicsMutex > epicsOnceImpl::pMutex;
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epicsSingleton < tsFreeList < class epicsOnceImpl, 16 > > epicsOnceImpl::pFreeList;
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inline void * epicsOnceImpl::operator new ( size_t size )
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{
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return epicsOnceImpl::pFreeList->allocate ( size );
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}
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inline void epicsOnceImpl::operator delete ( void *pCadaver, size_t size )
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{
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epicsOnceImpl::pFreeList->release ( pCadaver, size );
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}
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inline epicsOnceImpl::epicsOnceImpl ( epicsOnceNotify & notifyIn ) :
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notify ( notifyIn ), onceFlag ( false )
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{
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}
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void epicsOnceImpl::once ()
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{
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if ( ! this->onceFlag ) {
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epicsGuard < epicsMutex > guard ( *this->pMutex );
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if ( ! this->onceFlag ) {
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this->notify.initialize ();
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this->onceFlag = true;
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}
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}
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}
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void epicsOnceImpl::destroy ()
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{
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delete this;
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}
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epicsOnce & epicsOnce::create ( epicsOnceNotify & notifyIn )
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{
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// free list throws exception in no memory situation
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return * new epicsOnceImpl ( notifyIn );
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}
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epicsOnce::~epicsOnce ()
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{
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}
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epicsOnceNotify::~epicsOnceNotify ()
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{
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}
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