65 lines
3.1 KiB
C
65 lines
3.1 KiB
C
/** \file global.h
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License.
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* Kinect For Azure SDK.
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*/
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#ifndef GLOBAL_H
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#define GLOBAL_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef void *k4a_init_once_t;
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#define K4A_INIT_ONCE \
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{ \
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0 \
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}
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typedef void(k4a_init_once_function_t)(void);
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void global_init_once(k4a_init_once_t *init_once, k4a_init_once_function_t *init_function);
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#ifdef __cplusplus
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#define DEFAULT_INIT(type, field) field = type()
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#else
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#define DEFAULT_INIT(type, field) memset(&field, 0, sizeof(field))
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#endif
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/** Declares an initialized global context
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*
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* \param _global_type_
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* The structure type of the global context
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*
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* \param _init_function_
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* An initialization function that returns void and takes a pointer to a _global_type_ structure.
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* This function will be called once to initialize the global structure.
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*
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* \remarks
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* This macro creates a new function with the name of the global type followed by _get(). This function
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* returns a pointer to an initialized singleton instance of the global structure. Initialization will only
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* happen once per module and is safe across multiple threads attempting to initialize at the same time.
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*
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*/
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#define K4A_DECLARE_GLOBAL(_global_type_, _init_function_) \
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static k4a_init_once_t g_##_global_type_##_init_once = K4A_INIT_ONCE; \
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static _global_type_ _##_global_type_##_private; \
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static void fn_##_global_type_##_init_function(void) \
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{ \
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DEFAULT_INIT(_global_type_, _##_global_type_##_private); \
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_init_function_(&_##_global_type_##_private); \
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return; \
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} \
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static _global_type_ *_global_type_##_get() \
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{ \
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global_init_once(&g_##_global_type_##_init_once, &fn_##_global_type_##_init_function); \
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return &_##_global_type_##_private; \
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* GLOBAL_H */
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