Linux multi-threaded programming learning code (the code has been uploaded to gitee, please click Star!)
https://gitee.com/chenshao777/linux_thread.git
Notes:
thread link pthread_join
int pthread_join(pthread_t thread, void **retval);
Function:
1. The thread calling this function will be blocked until the thread with the specified pid as thread calls pthread_exit, return or is cancelled. 2.
pthread_join will make the specified thread in the separated state, and the thread in the separated state cannot be joined
Parameters:
thread: the pid of the linked thread
retval: the return code
If the specified thread is canceled, retval is set to PTHREAD_CANCELED
If the call is successful, the function returns 0
and returns an error code on failure
spu.h file
#ifndef _SPU_H_
#define _SPU_H_
#include<stdio.h>
#include<pthread.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include<sys/types.h>
#endif
04. thread_join.c file
/*
1.创建两个线程，其中线程2执行过程中自己分离自己
2.main线程中join两个线程
3.join线程1成功，返回码为0，pthread_join返回0
4.join线程2失败，返回码随机，pthread_join返回22，表示线程不可链接
*/
#include "spu.h"
void *thread_fun1(void *arg)
{
for(int i = 0; i< 10; i++)
printf("thread01 : %d\n", i);
return (void*)0;
}
void *thread_fun2(void *arg)
{
for(int i = 100; i< 110; i++)
{
printf("thread02 : %d\n", i);
pthread_detach(pthread_self()); //分离线程，分离自己，参数：线程id
}
return (void*)0;
}
int main(int argc, char *argv[])
{
int err1, err2;
pthread_t thread_id1,thread_id2;
void * __thread_return1, * __thread_return2;
err1 = pthread_create(&thread_id1, NULL, thread_fun1, NULL);
err2 = pthread_create(&thread_id2, NULL, thread_fun2, NULL);
if(err1 || err2)
printf("create failed!\n");
else
printf("create success!\n");
printf("join thread01 return %d\n",pthread_join(thread_id1, &__thread_return1));
printf("join thread02 return %d\n",pthread_join(thread_id2, &__thread_return2));
printf("线程1返回码 %d\n",__thread_return1);
printf("线程2返回码 %d\n",__thread_return2);
return 0;
}