extern_interface/include/event.h

#ifndef _INCLUDE_EVENT_H_
#define _INCLUDE_EVENT_H_

#define CONCAT_(prefix, suffix) prefix##suffix
/// Concatenate `prefix, suffix` into `prefixsuffix`
#define CONCAT(prefix, suffix) CONCAT_(prefix, suffix)

/// Register event handler
#define ON_EVENT_EX(name, func, data)                                       \
    static void func (const char* event_name, void *args, void* user_data); \
    int CONCAT(func, _register_ret) = etif_event_register(#name, func, data);\
    static void func (const char* event_name, void *args, void* user_data)
#define ON_EVENT(name) ON_EVENT_EX(name, CONCAT(_event_ ## name ## _handle_line_, __LINE__), NULL)

#ifdef __cplusplus
extern "C" {
#endif

typedef void (*event_callback)(const char*, void*, void*);

void etif_event(const char *event_name, void *args, size_t args_size);
int etif_event_register(const char *event_name, event_callback callback, void* user_data);
int etif_event_unregister(const char *event_name, event_callback callback, void* user_data);
void* etif_event_thread(void*);

#ifdef __cplusplus
}
#endif

#endif