/*
* Copyright (c) 2020 Red Hat, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* $Id: //eng/uds-releases/jasper/src/uds/threadOnce.h#1 $
*/
#ifndef THREAD_ONCE_H
#define THREAD_ONCE_H
#include "atomicDefs.h"
#define ONCE_STATE_INITIALIZER ATOMIC_INIT(0)
typedef atomic_t OnceState;
/**
* Thread safe once only initialization.
*
* @param onceState pointer to object to record that initialization
* has been performed
* @param initFunction called if onceState does not indicate
* initialization has been performed
*
* @return UDS_SUCCESS or error code
*
* @note Generally the following declaration of onceState is performed in
* at file scope:
*
* static OnceState onceState = ONCE_STATE_INITIALIZER;
**/
int performOnce(OnceState *onceState, void (*initFunction) (void));
#endif /* THREAD_ONCE_H */