linux 互斥锁

 1 #include<stdio.h>
 2 #include<pthread.h>
 3 #include<stdlib.h>
 4 #include<unistd.h>
 5 
 6 int num=0;
 7 pthread_mutex_t lock;
 8 pthread_t th;
 9 
10 
11 void* th_handler(void* p){
12     int i=0;
13     for(;i<10;i++){
14         pthread_mutex_lock(&lock);
15         num++;17         printf("sub num=%d\n",num);
18         pthread_mutex_unlock(&lock);
19         sleep(1);
20     }
21 }
22 
23 
2425 int main(){
26 
27     pthread_mutex_init(&lock,NULL);
28     pthread_create(&th,NULL,th_handler,(void*)0);
　　　　//pthread_detach(th);设置分离线程不需要pthread_join();
29     sleep(1);
30     int i=0;
31     for(;i<10;i++){
32         pthread_mutex_lock(&lock);
33         num++;35         printf("main num=%d\n",num);
36         pthread_mutex_unlock(&lock);
37         sleep(1);
38     }
39     pthread_mutex_destroy(&lock);
40     pthread_join(th,0);    
41 
42 }