61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
/*************************************************************************\
|
|
* Copyright (c) 2002 The University of Chicago, as Operator of Argonne
|
|
* National Laboratory.
|
|
* Copyright (c) 2002 The Regents of the University of California, as
|
|
* Operator of Los Alamos National Laboratory.
|
|
* EPICS BASE Versions 3.13.7
|
|
* and higher are distributed subject to a Software License Agreement found
|
|
* in file LICENSE that is included with this distribution.
|
|
\*************************************************************************/
|
|
/*
|
|
* $Id$
|
|
*
|
|
* Author: Jeffrey O. Hill
|
|
*
|
|
*/
|
|
|
|
#include <new>
|
|
|
|
#define epicsExportSharedSymbols
|
|
#include "epicsMutex.h"
|
|
#include "epicsGuard.h"
|
|
#include "epicsThread.h"
|
|
#include "epicsSingleton.h"
|
|
|
|
static epicsThreadOnceId epicsSingletonOnceId = EPICS_THREAD_ONCE_INIT;
|
|
static epicsMutex *pSingletonBaseMutexEPICS;
|
|
|
|
static void epicsSingletonCleanup ()
|
|
{
|
|
delete pSingletonBaseMutexEPICS;
|
|
}
|
|
|
|
static void epicsSingletonOnce ( void * )
|
|
{
|
|
pSingletonBaseMutexEPICS = new epicsMutex;
|
|
atexit ( epicsSingletonCleanup );
|
|
}
|
|
|
|
epicsSingletonBase::epicsSingletonBase () : pSingleton ( 0 )
|
|
{
|
|
}
|
|
|
|
void * epicsSingletonBase::singletonPointer () const
|
|
{
|
|
return this->pSingleton;
|
|
}
|
|
|
|
epicsSingletonBase::~epicsSingletonBase ()
|
|
{
|
|
}
|
|
|
|
void epicsSingletonBase::lockedFactory ()
|
|
{
|
|
if ( ! this->pSingleton ) {
|
|
epicsThreadOnce ( & epicsSingletonOnceId, epicsSingletonOnce, 0 );
|
|
epicsGuard < epicsMutex > guard ( *pSingletonBaseMutexEPICS );
|
|
if ( ! this->pSingleton ) {
|
|
this->pSingleton = this->factory ();
|
|
}
|
|
}
|
|
} |