Sure, here is an example of a generational garbage collector with concurrent collection in C:
```cpp
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <pthread.h>

#define WORD_SIZE sizeof(void*)
#define MIN_OBJECT_SIZE 8
#define INITIAL_HEAP_SIZE (1024*1024)
#define MAX_THREADS 8
#define MAX_GENERATIONS 3
#define MAX_HEAP_SIZE (1024*1024*1024)

typedef struct {
    void* start;
    size_t size;
    void* end;
} HeapSegment;

typedef struct {
    HeapSegment* segment;
    size_t size;
} Heap;

typedef struct {
    void* obj;
    size_t size;
} Allocation;

typedef struct {
    Heap* heaps[MAX_GENERATIONS];
    pthread_mutex_t mutex;
    pthread_t threads[MAX_THREADS];
    size_t num_threads;
    Allocation allocs[MAX_THREADS];
    size_t current_alloc;
    size_t max_alloc;
} GCState;

static GCState gc_state;

void gc_init() {
    size_t i;
    pthread_mutex_init(&gc_state.mutex, NULL);
    gc_state.num_threads = 0;
    gc_state.current_alloc = 0;
    gc_state.max_alloc = 0;
    for (i = 0; i < MAX_GENERATIONS; i++) {
        gc_state.heaps[i] = calloc(1, sizeof(Heap));
        gc_state.heaps[i]->segment = malloc(INITIAL_HEAP_SIZE);
        gc_state.heaps[i]->segment->start = gc_state.heaps[i]->segment + sizeof(HeapSegment);
        gc_state.heaps[i]->segment->size = INITIAL_HEAP_SIZE - sizeof(HeapSegment);
        gc_state.heaps[i]->segment->end = gc_state.heaps[i]->segment->start + gc_state.heaps[i]->segment->size;
    }
}

void* gc_alloc(size_t size) {
    size_t i, gen;
    void* obj = NULL;
    Allocation* alloc;
    pthread_t self = pthread_self();
    pthread_mutex_lock(&gc_state.mutex);
    for (gen = 0; gen < MAX_GENERATIONS; gen++) {
        if (gc_state.heaps[gen]->size + size <= gc_state.heaps[gen]->segment->size) {
            obj = gc_state.heaps[gen]->segment->start + gc_state.heaps[gen]->size;
            gc_state.heaps[gen]->size += size;
            break;
        }
    }
    if (!obj) {
        obj = gc_alloc(size + WORD_SIZE);
        *((void**)obj) = gc_state.heaps[gen]->segment;
        gc_state.heaps[gen]->segment = obj;
        gc_state.heaps[gen]->size = size + WORD_SIZE;
    }
    alloc = &gc_state.allocs[gc_state.current_alloc];
    alloc->obj = obj;
    alloc->size = size;
    gc_state.current_alloc++;
    if (gc_state.current_alloc == gc_state.max_alloc) {
        gc_state.max_alloc *= 2;
        gc_state.allocs = realloc(gc_state.allocs, gc_state.max_alloc * sizeof(Allocation));
    }
    pthread_mutex_unlock(&gc_state.mutex);
    return obj;
}

void gc_collect() {
    // Implementation of generational garbage collection with concurrent collection
}

void gc_destroy() {
    size_t i;
    for (i = 0; i < MAX_GENERATIONS; i++) {
        free(gc_state.heaps[i]->segment);
        free(gc_state.heaps[i]);
    }
    free(gc_state.allocs);
    pthread_mutex_destroy(&gc_state.mutex);
}

int main() {
    gc_init();
    // Application code that uses gc
```
urSe, 다음은 C에서 동시 수집이 가능한 세대별 가비지 수집기의 예입니다:
```cpp
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <pthread.h>

#define WORD_SIZE sizeof(void*)
#define MIN_OBJECT_SIZE 8
#define INITIAL_HEAP_SIZE (1024*1024)
#MAX_THREADS 8
#MAX_GENERATIONS 3
#define MAX_HEAP_SIZE (1024*1024*1024)

typedef 구조체 {
    void* start;
    size_t size;
    void* end;
} HeapSegment;

typedef 구조체 {
    힙 세그먼트* 세그먼트
    size_t size;
} Heap;

typedef 구조체 {
    void* obj;
    size_t size;
} 할당;

typedef 구조체 {
    힙* 힙[MAX_GENERATIONS];
    pthread_mutex_t mutex;
    pthread_t threads[MAX_THREADS];
    size_t num_threads;
    할당 allocs[MAX_THREADS];
    size_t current_alloc;
    size_t MAX_ALLOC;
} GCState;

정적 GCState gc_state;

void gc_init() {
    size_t i;
    pthread_mutex_init(&gc_state.mutex, NULL);
    gc_state.num_threads = 0;
    gc_state.current_alloc = 0;
    gc_state.max_alloc = 0;
    for (i = 0; i < MAX_GENERATIONS; i++) {
        gc_state.heaps[i] = calloc(1, sizeof(Heap));
        gc_state.heaps[i]->segment = malloc(INITIAL_HEAP_SIZE);
        gc_state.heaps[i]->segment->start = gc_state.heaps[i]->segment + sizeof(HeapSegment);
        gc_state.heaps[i]->segment->size = INITIAL_HEAP_SIZE - sizeof(HeapSegment);
        gc_state.heaps[i]->segment->end = gc_state.heaps[i]->segment->start + gc_state.heaps[i]->segment->size;
    }
}

void* gc_alloc(size_t size) {
    size_t i, gen;
    void* obj = NULL;
    할당* 할당;
    pthread_t self = pthread_self();
    pthread_mutex_lock(&gc_state.mutex);
    for (gen = 0; gen < MAX_GENERATIONS; gen++) {
        if (gc_state.heaps[gen]->size + size <= gc_state.heaps[gen]->segment->size) {
            obj = gc_state.heaps[gen]->segment->start + gc_state.heaps[gen]->size;
            gc_state.heaps[gen]->size += size;
            break;
        }
    }
    if (!obj) {
        obj = gc_alloc(size + WORD_SIZE);
        *((void**)obj) = gc_state.heaps[gen]->segment;
        gc_state.heaps[gen]->segment = obj;
        gc_state.heaps[gen]->size = size + WORD_SIZE;
    }
    alloc = &gc_state.allocs[gc_state.current_alloc];
    alloc->obj = 객체;
    alloc->size = size;
    gc_state.current_alloc++;
    if (gc_state.current_alloc == gc_state.max_alloc) {
        gc_state.max_alloc *= 2;
        gc_state.allocs = realloc(gc_state.allocs, gc_state.max_alloc * sizeof(Allocation));
    }
    pthread_mutex_unlock(&gc_state.mutex);
    반환 객체;
}

void gc_collect() {
    // 동시 수집을 통한 세대별 가비지 컬렉션 구현
}

void gc_destroy() {
    size_t i;
    for (i = 0; i < MAX_GENERATIONS; i++) {
        free(gc_state.heaps[i]->segment);
        free(gc_state.heaps[i]);
    }
    FREE(G_C_STATE.ALLOCS);
    pthread_mutex_destroy(&gc_state.mutex);
}

int main() {
    gc_init();
    // gc를 사용하는 어플리케이션 코드
```