oncerun.c

来自「LINUX C编程实战这本书附带光盘的原代码」· C语言 代码 · 共 37 行

#include <stdio.h> 
#include <pthread.h> 

pthread_once_t once = PTHREAD_ONCE_INIT; 

void run(void) 
{ 
   printf("Fuction run is running in thread %d\n",pthread_self()); 
} 

void * thread1(void *arg) 
{ 
   pthread_t thid=pthread_self(); 
   printf("Current thread's ID is %d\n", thid); 
   pthread_once(&once,run); 
   printf("thread1 ends\n"); 
} 

void * thread2(void *arg) 
{ 
   pthread_t thid=pthread_self(); 
   printf("Current thread's ID is %d\n", thid); 
   pthread_once(&once, run); 
   printf("thread2 ends\n");  
} 

int main(void) 
{ 
   pthread_t thid1,thid2; 

   pthread_create(&thid1,NULL,thread1,NULL); 
   pthread_create(&thid2,NULL, thread2,NULL); 
   sleep(3); 
   printf("main thread exit! \n"); 
   exit(0);
}