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線程異常：undefined reference to 'pthread_create' 處理

源碼：

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


void *producter_f (void *arg);
void *consumer_f (void *arg);




int buffer_has_item=0;
pthread_mutex_t mutex;


int running =1 ;


int main (void)
{
pthread_t consumer_t;
pthread_t producter_t;

pthread_mutex_init (&mutex,NULL);

pthread_create(&producter_t, NULL,(void*)producter_f, NULL );
pthread_create(&consumer_t, NULL, (void *)consumer_f, NULL);
usleep(1);
running =0;
pthread_join(consumer_t,NULL);
pthread_join(producter_t,NULL);
pthread_mutex_destroy(&mutex);

return 0;
}


void *producter_f (void *arg)
{
while(running)
{
pthread_mutex_lock (&mutex);
buffer_has_item++;
printf("生產，總數量:%d\n",buffer_has_item);
pthread_mutex_unlock(&mutex);
}
}


void *consumer_f(void *arg)
{
while(running)
{
pthread_mutex_lock(&mutex);
buffer_has_item--;
printf("消費，總數量:%d\n",buffer_has_item);
pthread_mutex_unlock(&mutex);
}
}

錯誤場景：

[root@luozhonghua 04]# gcc -o mutex ex04-5-mutex.c

collect2: ld returned 1 exit status

分析：pthread 庫不是 Linux 係統默認的庫，連接時需要使用靜態庫 libpthread.a

處理：

在編譯中加 -lpthread 參數
[root@luozhonghua 04]# gcc -lpthread -o mutex ex04-5-mutex.c

最後更新：2017-04-03 05:39:56

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