pthread线程特定数据

• 举个栗子

  •  1 #include <stdio.h>
     2 #include <stdlib.h>
     3 #include <unistd.h>
     4 #include <sys/types.h>
     5 #include <pthread.h>
     6 #include <errno.h>
     7 #include <string.h>
     8 
     9 #define ERR_EXIT(m)\
    10     do\
    11     {\
    12         perror(m);\
    13         exit(EXIT_FAILURE);\
    14     }while(0)\
    15 
    16 typedef struct tsd
    17 {
    18     pthread_t tid;
    19     char* str;
    20 }tsd_t;
    21 
    22 pthread_key_t key_tsd;
    23 
    24 void destroy_routine(void* value)
    25 {
    26     free(value);
    27     printf("destroy...\n");
    28 }
    29 
    30 void* thread_routinne(void* arg)
    31 {
    32     tsd_t* value = (tsd_t*)malloc(sizeof(tsd_t));
    33     value->tid = pthread_self();
    34     value->str = (char*)arg;
    35 
    36     pthread_setspecific(key_tsd,value);
    37     
    38     printf("%s setspecific %p\n",(char*)arg,value);
    39 
    40     value = pthread_getspecific(key_tsd);
    41     printf("tid=0x%x str=%s\n",value->tid,value->str);
    42     sleep(2);
    43 
    44     value = pthread_getspecific(key_tsd);
    45     printf("tid=0x%x str=%s\n",value->tid,value->str);
    46     return NULL;
    47 }
    48 
    49 int main(void)
    50 {
    51     pthread_key_create(&key_tsd,destroy_routine);
    52     
    53     pthread_t tid1;
    54     pthread_t tid2;
    55     pthread_create(&tid1, NULL, thread_routinne, "thread1");
    56     pthread_create(&tid2, NULL, thread_routinne, "thread1");
    57 
    58     pthread_join(tid1,NULL);
    59     pthread_join(tid2,NULL);
    60 
    61     pthread_key_delete(key_tsd);
    62 
    63 
    64     return 0;
    65 }

  • 分析

    • 线程特定数据对每个线程都有一个独立的数据