Linux C线程学习简单示例

#include"stdio.h"
#include"pthread.h"
 
/*
void *thr_fn(void *arg)
{
    int j = 0;
    for(j=0;j<1000;j++)
    {
       sleep(1);
	   printf("new thread: \n");
    }
}

int main()
{
	int err;
	int i = 0;
	pthread_t tid;
	err=pthread_create(&tid,NULL,thr_fn,NULL);
	if(err=0)
      printf("can’t create thread:%s\n",strerror(err));
    for(i=0; i<100; i++)
	 {
	   sleep(1);
	   printf("main thread: \n"); 
	 }
    sleep(10);
*/

/*
int g_inum;
pthread_mutex_t testlock;

void *thr_fn(void *arg)
{
    int j;
   // pthread_mutex_lock(&testlock);
    for(j=0;j<10000000;j++)
    {  
       pthread_mutex_lock(&testlock);
       g_inum++;   
       pthread_mutex_lock(&testlock);
    }
   // pthread_mutex_unlock(&testlock);
}

int main()
{
	int err;
	int i = 0;
	pthread_t tid;
	
	pthread_mutex_init(&testlock, NULL);
    printf("Main init lock \n");
	
	for(i=0;i<10;i++)
	{
	  err=pthread_create(&tid,NULL,thr_fn,NULL);
	  if(err=0)
        printf("can’t create thread:%s\n",strerror(err));
    }
    
    sleep(10); 
    
    pthread_mutex_destroy(&testlock);
    printf("main destroy lock \n");
    printf("the result is %d\n",g_inum);   
*/     
	return 0;
}