编写了一个多线程程序:
4FKu e$}} _G]Linux伊甸园论坛#include <unistd.h>
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pLinux伊甸园论坛#include <stdio.h>
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#include <pthread.h>
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void echomsg(int t)
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{
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printf("线程退出.\n");
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printf("destructor excuted in thread %d, param=%d\n",pthread_self(),t);
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#Nf5iU]PrGvoid *child1(void *arg) //为每一个线程单独建一个执行函数
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int tid=pthread_self(); //求线程id号
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pthread_setspecific(key,(void *)tid); //将tid的值与key相关联,注意不是*tid
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sleep(2);
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printf("thread %d returns %d \n", tid , pthread_getspecific(key)); //读出key值,即*tid?
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return NULL;
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L0t _~d'g;cwww.linuxeden.comvoid *child2(void *arg)
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int tid=pthread_self();
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printf("thread %d enter\n",tid);
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pthread_setspecific(key,(void *)tid); //将tid的值与key相关联,注意不是*tid
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sleep(1);
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printf("thread %d returns %d \n", tid , pthread_getspecific(key)); //读出key值,即*tid?
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return NULL;
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}
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\[1M(^ E+NqgLinux伊甸园论坛int main()
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pthread_key_create(&key,echomsg); //注意在创建线程前创建私有数据,线程退出时会将key作为参数送入echomsg
7T0vc/T aLinux伊甸园论坛 pthread_create(&tid1,NULL,child1,NULL); //创建线程,其中第一个NULL是设置线程属性,第二个NULL是child1函数的传人参数.线程的作用就是执行child1.
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pthread_key_delete(key); //释放TSD
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return 0;
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Y-k n'kZZ编译时总提示
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a1OizbP/i.R/tmp/ccFXz8Ip.o(.text+0xde): In function `child2':
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mythread.c: undefined reference to `pthread_setspecific'
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/tmp/ccFXz8Ip.o(.text+0x166): In function `main':
.T*blD%hfJ imythread.c: undefined reference to `pthread_key_create'
If"M3i%UF'Y7v/tmp/ccFXz8Ip.o(.text+0x17b):mythread.c: undefined reference to `pthread_create'
uk5n7_%V m:}A/tmp/ccFXz8Ip.o(.text+0x190):mythread.c: undefined reference to `pthread_create'
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/tmp/ccFXz8Ip.o(.text+0x1ae):mythread.c: undefined reference to `pthread_key_delete'
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Y3zR y s,~另外用gcc -Ipthread -Wall mythread.c -o mythread也没有用;
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7Y6Z&?%Re;h2[$y谢谢大家.
