리눅스로 큐를 구현하는데 세그멘테이션 오류가 뜹니다

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include <pthread.h>
#include <assert.h>
typedef struct _node_t{
    int value;
    struct _node_t *next;
} node_t;
typedef struct _queue_t{
    node_t *head;
    node_t *tail;
    pthread_mutex_t headLock;
    pthread_mutex_t tailLock;
}queue_t;
void Queue_Iint(queue_t *q){
    node_t *tmp = malloc(sizeof(node_t));
    tmp->next = NULL;
    q->head = q-> tail =tmp;
    pthread_mutex_init(&q->headLock, NULL);
    pthread_mutex_init(&q->tailLock,NULL);
}
void Queue_Enqueue(queue_t *q, int value){
    node_t *tmp = malloc(sizeof(node_t));
    assert(tmp !=NULL);
    tmp->value =value;
    tmp -> next = NULL;
    pthread_mutex_lock(&q->tailLock);
    q->tail->next = tmp;
    q->tail=tmp;
    pthread_mutex_unlock(&q->tailLock);
}
int Queue_Dequeue(queue_t *q, int *value){
    pthread_mutex_lock(&q->headLock);
    node_t *tmp = q->head;
    node_t *newHead =tmp->next;
    if(newHead ==NULL){
        pthread_mutex_unlock(&q->headLock);
        return -1;
    }
    *value = newHead->value;
    q->head = newHead;
    pthread_mutex_unlock(&q->headLock);
    int re=tmp->value;
    free(tmp);
    return re;
}
int main(){
    node_t n;
    queue_t q;
    Queue_Enqueue(&q,3);
 
}