为什么会error: syntax error at end of input？？？

[清风伴月88]

编译提示如下错误： 没有语法错误啊，请问是为什么？
clone.c: In function `main':
clone.c:55: error: syntax error at end of input

#include <stdlib.h>
#include "semaphore.h"
#include "pthread.h"
int reader_function(int);
int writer_function(int);
char buffer[100];
sem_t product;
sem_t s;
pthread_mutex_t mutex;
main(){
pthread_t reader,writer;
pthread_mutex_init(&mutex,NULL);
char *stack;
int clone_flag,id,retval;
clone_flag=CLONE_VM|CLONE_SIGHAND|CLONE_FS|CLONE_FILES;
int i;
for(i=1;i<=2;i++){
id=i;
stack=(char *)malloc(4096);
retval=clone((void *)writer_function,&(stack[4095]),clone_flag,&id);
stack=(char *)malloc(4096);
retval=clone((void *)reader_function,&(stack[4095]),clone_flag,&id);
}
exit(1);
int write_function(id){
sem_wait(&s);
pthread_mutex_lock(&mutex);
if(id==1){
printf("write function1 is running!\n");
sprintf(buffer,"aaa\n",100); }
else{
printf("write function2 is runing!\n");
sprintf(buffer,"bbb\n",100);
} pthread_mutex_unlock(&mutex);
sem_post(&s);
} int read_function(id){
sem_wait(&product);
pthread_mutex_lock(&mutex);
if(id==1){
printf("buffer was read by reader 1!\n");
printf("%s\n",buffer);
} else {
printf("buffer was read by reader 2!\n");
printf("%s\n",buffer);
} pthread_mutex_unlock(&mutex);
sem_post(&product);
}

[x86]

很明显最后少一个大括号。看看是否这个问题。

[loveisbug]

底下又多出一个括号