线程同步与互斥

代码如下：

#include<stdio.h>
#include<stdlib.h>
#include<pthread.h>
#include<sys/time.h>
int a=10;
int b=20;
pthread_t thread[2];
pthread_mutex_t mux;
void addthread()
{
    printf("加线程\n");
    pthread_mutex_lock(&mux);
    printf("%d=a+1\n",++a);
    printf("%d=b+1\n",++b);
    pthread_mutex_unlock(&mux);
    printf("加操作结束\n");
    pthread_exit(NULL);
}
void subthread()
{
    printf("减线程\n");
    pthread_mutex_lock(&mux);
    printf("%d=a-1\n",--a);
    printf("%d=b-1\n",--b);
    pthread_mutex_unlock(&mux);
    printf("减操作结束\n");
    pthread_exit(NULL);
}
void thread_create(void)
{
    int temp;
    memset(&thread,0,sizeof(thread));//分配空间
    if((temp=pthread_create(&thread[0],NULL,addthread,NULL))!=0)
        printf("创建线程addthread失败\n");
    else
        printf("addthread创建成功\n");
    if((temp=pthread_create(&thread[1],NULL,subthread,NULL))!=0)
        printf("创建线程subthread失败\n");
    else
        printf("subthread创建成功\n");
}
void thread_wait(void)
{
    if(thread[0]!=0)
    {
        pthread_join(thread[0],NULL);
        printf("线程addthread已经结束\n");
    }
    if(thread[1]!=0)
    {
        pthread_join(thread[0],NULL);
        printf("线程subthread已经结束");
    }
}
int main()
{
    pthread_mutex_init(&mux,NULL);//初始化
    printf("主线程\n")
    thread_create();
    printf("等待线程完成任务\n");
    thread_wait();
    return 0;
}