为什么编译出错 ？

springzbz

#include <pthread.h>
#include "errors.h"

typedef struct tsd_tag{
    pthread_t thread_id ;
    char *string ;
}tsd_t ;

pthread_key_t tsd_key ;
pthread_once_t key_once = PTHREAD_ONCE_INIT ;

void once_routine(void)
{
    int status ;
    printf("initializing key\n") ;
    status = pthread_key_create(&tsd_key,NULL) ;
    if(status != 0)
        err_abort(status,"Create key") ;
        
}

void *thread_routine(void *arg)
{
    tsd_t *value ;
    int status ;
   
    status = pthread_once(&key_once,once_routine) ;
    if(status != 0)
        err_abort(status,"once_init") ;
    value = (tsd_t*)malloc(sizeof(tsd_t)) ;
    if(value ==NULL)
        errno_abort("allocate key value") ;
    status = pthread_setspecific(tsd_key,value) ;
    if(status != 0)
        err_abort(status,"set tsd") ;
    printf("%s set tsd value %p \n",arg,value) ;
    value->thread_id = pthread_self() ;
    value->string = (char *)arg ;
    value = (tsd_t*)pthread_getspecific(tsd_key) ;
    printf("%s starting...\n",value->string) ;
    sleep(2) ;
    value = (tsd_t*)pthread_getspecific(tsd_key) ;
    printf("%s done...\n",value->string) ;
    return NULL ;
   
}

void main(int argc,char *argv[])
{
   pthread_t thread1,thread2 ;
   int status ;
   status = pthread_create(&thread1,NULL,thread_routine,"thread1") ;
   if(status != 0)
       err_abort(status,"Create thread1") ;
   status = pthread_create(&thread2,NULL,thread_routine,"thread2") ;
   if(status != 0)
       err_abort(status,"Creat thread2") ;
   pthread_exit(NULL) ;
}

springzbz

[root@localhost tsd_once]# gcc tsd_once.c -o tsd_once
tsd_once.c: In function `main':
tsd_once.c:49: warning: return type of `main' is not `int'
/tmp/ccDl90rA.o(.text+0x21): In function `once_routine':
: undefined reference to `pthread_key_create'
/tmp/ccDl90rA.o(.text+0x7e): In function `thread_routine':
: undefined reference to `pthread_once'
/tmp/ccDl90rA.o(.text+0x127): In function `thread_routine':
: undefined reference to `pthread_setspecific'
/tmp/ccDl90rA.o(.text+0x1a0): In function `thread_routine':
: undefined reference to `pthread_getspecific'
/tmp/ccDl90rA.o(.text+0x1d7): In function `thread_routine':
: undefined reference to `pthread_getspecific'
/tmp/ccDl90rA.o(.text+0x222): In function `main':
: undefined reference to `pthread_create'
/tmp/ccDl90rA.o(.text+0x279): In function `main':
: undefined reference to `pthread_create'
collect2: ld returned 1 exit status

流氓无产者

need -lpthread

springzbz

果然要加-lpthread,谢谢,可是还是有错误
[root@localhost tsd_once]# gcc -lpthread tsd_once.c -o tsd_once
tsd_once.c: In function `main':
tsd_once.c:49: warning: return type of `main' is not `int'

MMMIX

原帖由 springzbz 于 2007-4-17 22:17 发表于 4楼  
果然要加-lpthread,谢谢,可是还是有错误
# gcc -lpthread tsd_once.c -o tsd_once
tsd_once.c: In function `main':
tsd_once.c:49: warning: return type of `main' is not `int'

看看这个帖子：
[转贴]为什么在类 Unix 系统下 "void main(void)" 是错误的

或者原文
void main(void) - the Wrong Thing

[ 本帖最后由 MMMIX 于 2007-4-18 14:50 编辑 ]