pthread线程特定数据

• 举个栗子

  •  #include <stdio.h>
     #include <stdlib.h>
     #include <unistd.h>
     #include <sys/types.h>
     #include <pthread.h>
     #include <errno.h>
     #include <string.h>
    
     #define ERR_EXIT(m)\
         do\
         {\
             perror(m);\
             exit(EXIT_FAILURE);\
         }while()\
    
     typedef struct tsd
     {
         pthread_t tid;
         char* str;
     }tsd_t;
    
     pthread_key_t key_tsd;
    
     void destroy_routine(void* value)
     {
         free(value);
         printf("destroy...\n");
     }
    
     void* thread_routinne(void* arg)
     {
         tsd_t* value = (tsd_t*)malloc(sizeof(tsd_t));
         value->tid = pthread_self();
         value->str = (char*)arg;
    
         pthread_setspecific(key_tsd,value);
    
         printf("%s setspecific %p\n",(char*)arg,value);
    
         value = pthread_getspecific(key_tsd);
         printf("tid=0x%x str=%s\n",value->tid,value->str);
         sleep();
    
         value = pthread_getspecific(key_tsd);
         printf("tid=0x%x str=%s\n",value->tid,value->str);
         return NULL;
     }
    
     int main(void)
     {
         pthread_key_create(&key_tsd,destroy_routine);
    
         pthread_t tid1;
         pthread_t tid2;
         pthread_create(&tid1, NULL, thread_routinne, "thread1");
         pthread_create(&tid2, NULL, thread_routinne, "thread1");
    
         pthread_join(tid1,NULL);
         pthread_join(tid2,NULL);
    
         pthread_key_delete(key_tsd);
    
         return ;
     }

  • 分析

    • 线程特定数据对每个线程都有一个独立的数据