linux 多线程编程-读写者问题

#include <cstdio>
#include <pthread.h>
#include <unistd.h>

int buffer[];
int i,j;

pthread_rwlock_t rwlock;

void *writefun(void *arg)
{
    int pid = pthread_self();
    printf("写者%d 进入等待状态 。。。。\n",pid);
    pthread_rwlock_wrlock(&rwlock);
    printf("写者%d 写>>>\n",pid);
    sleep();
    printf("写者%d 写结束\n",pid);
    pthread_rwlock_unlock(&rwlock);
    return NULL;
}

void *readfun(void *arg)
{
    int pid = pthread_self();
    printf("读者%d 进入等待状态。。。。\n",pid);
    pthread_rwlock_rdlock(&rwlock);
    printf("读者%d 读<<<\n",pid);
    sleep();
    printf("读者%d 读结束\n",pid);
    pthread_rwlock_unlock(&rwlock);
    return NULL;
}

int main()
{
    pthread_t pread[],pwrite;
    pthread_create(&pwrite,NULL,writefun,);
    for(int i=; i < ; i++)
        pthread_create(&pread[i],NULL,readfun,);

    pthread_join(pwrite,NULL);
    for(int i = ; i < ; i++)
        pthread_join(pread[i],NULL);
    return ;
}

编译选项

g++ -lpthread -o main main.cpp
./main