pthread多线程

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int pthread_join(pthread_t thread, void **retval);

返回值：若成功则返回0，否则返回错误编号。

调用该函数的线程将一直阻塞，直到指定的线程thread调用pthread_exit，从启动例程中返回或者被取消。

看如下程序：

#include <stdio.h>#include <pthread.h>void* printMsg1(void *data){printf("the thread 1 id is %u\n",(unsigned int)pthread_self());sleep(5);}void* printMsg2(void *data){printf("the thread 2 id is %u\n",(unsigned int)pthread_self());}int main(){pthread_t t1,t2;pthread_create(&t1,NULL,printMsg1,NULL);pthread_join(t1,NULL);printf("I am waiting\n");pthread_create(&t2,NULL,printMsg2,NULL);pthread_join(t2,NULL);return 0;}

运行结果为：

tomcat@tomcat-Lenovo-IdeaPad-Y550:~/code$ ./pthreadTest
the thread 1 id is 2745190144
I am waiting
the thread 2 id is 2745190144

在t1执行完毕后，才打印出了I am waiting。说明程序在pthread_join处一直阻塞等待t1线程结束。

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