init.h

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#ifndef ZTH_INIT_H
#define ZTH_INIT_H
/*
 * SPDX-FileCopyrightText: 2019-2026 Jochem Rutgers
 *
 * SPDX-License-Identifier: MPL-2.0
 */
 
#include <libzth/macros.h>
 
#include <stdlib.h>
 
struct zth_init_entry {
#ifdef __cplusplus
        zth_init_entry(void (*f_)(void), zth_init_entry const* next_) noexcept
                : f(f_)
                , next(next_)
        {}
#endif // C++
        void (*f)(void);
        struct zth_init_entry const* next;
};
 
extern struct zth_init_entry const* zth_init_head;
extern struct zth_init_entry* zth_init_tail;
EXTERN_C ZTH_EXPORT void zth_init();
EXTERN_C ZTH_EXPORT void zth_preinit();
EXTERN_C ZTH_EXPORT int zth_postdeinit();
 
#ifdef __cplusplus
#  ifndef ZTH_INIT_CALL
#    define ZTH_INIT_CALL_(f, ...)                              \
            struct f##__init : public zth_init_entry {          \
                    f##__init() noexcept                        \
                            : zth_init_entry(&exec, nullptr)    \
                    {                                           \
                            if(zth_init_tail)                   \
                                    zth_init_tail->next = this; \
                            zth_init_tail = this;               \
                            if(!zth_init_head)                  \
                                    zth_init_head = this;       \
                    }                                           \
                    static void exec() { __VA_ARGS__ };         \
            };
#    define ZTH_INIT_CALL(f)        \
            ZTH_INIT_CALL_(f, f();) \
            static f##__init const f##__init_;
#  endif
 
#  ifndef ZTH_DEINIT_CALL
#    ifdef ZTH_OS_BAREMETAL
#      define ZTH_DEINIT_CALL(...) // Don't bother doing any cleanup during shutdown.
#    else
#      define ZTH_DEINIT_CALL(f)            \
              ZTH_INIT_CALL_(f, atexit(f);) \
              static f##__init f##__deinit_;
#    endif
#  endif
 
#endif // __cplusplus
#endif // ZTH_INIT_H