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67 lines
2.2 KiB
67 lines
2.2 KiB
#ifndef _DESINGLETON_H
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#define _DESINGLETON_H
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/*-------------------------------------------------------------------------
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* drawElements Thread Library
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* ---------------------------
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*
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* Copyright 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*//*!
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* \file
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* \brief Thread-safe singleton.
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*//*--------------------------------------------------------------------*/
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#include "deDefs.h"
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typedef enum deSingletonState_e
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{
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DE_SINGLETON_STATE_NOT_INITIALIZED = 0,
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DE_SINGLETON_STATE_INITIALIZING,
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DE_SINGLETON_STATE_INITIALIZED,
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DE_SINGLETON_STATE_LAST
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} deSingletonState;
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DE_BEGIN_EXTERN_C
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typedef void (*deSingletonConstructorFunc) (void* arg);
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/*--------------------------------------------------------------------*//*!
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* \brief Initialize singleton.
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*
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* This function ensures that singletonState = DE_SINGLETON_STATE_INITIALIZED
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* upon return.
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*
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* If current singleton state is DE_SINGLETON_NOT_INITIALIZED, constructor
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* function is called with the supplied argument (arg).
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*
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* It is guaranteed that constructor is called only once, even when multiple
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* concurrent calls are made to deInitSingleton().
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*
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* Note that singletonState memory location must be initialized to
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* DE_SINGLETON_STATE_NOT_INITIALIZED prior to any calls to deInitSingleton().
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*
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* \param singletonState Pointer to singleton state.
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* \param constructor Constructor function.
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* \param arg Generic arg pointer for constructor.
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*//*--------------------------------------------------------------------*/
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void deInitSingleton (volatile deSingletonState* singletonState, deSingletonConstructorFunc constructor, void* arg);
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void deSingleton_selfTest (void);
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DE_END_EXTERN_C
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#endif /* _DESINGLETON_H */
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