4.2线程创建等待及退出（第二阶段）

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本文介绍了如何使用C语言的pthread库来管理线程，包括线程的创建（pthread_create）、线程退出（pthread_exit）以及线程等待（pthread_join）。示例代码详细展示了如何创建线程并传递参数，线程如何退出并返回值，以及主线程如何等待子线程结束并获取其退出状态。

4.2线程创建等待及退出（第二阶段）

线程创建 pthread_cread
退出 pthread_exit
等待 pthread_join
代码展示

线程的创建

#include <pthread.h>
#include <stdio.h>
//       int pthread_create(pthread_t *thread, const pthread_attr_t *attr,
//                          void *(*start_routine) (void *), void *arg);
//	int pthread_join(pthread_t thread, void **retval);



void *func1(void *arg)
{	
	printf("t1:%ld thread is create\n",(unsigned long)pthread_self());
	printf("t1:param is %d\n",*((int *)arg));
}



int main()
{
	int ret;
	int param = 100;
	pthread_t t1;


	ret = pthread_create(&t1,NULL,func1,(void *)&param);

	if(ret == 0){
		printf("main:cread t1 success\n");
	}
	printf("main:%ld\n",(unsigned long)pthread_self());
//	while(1);
		

	return 0;
}

线程的退出

#include <pthread.h>
#include <stdio.h>
//       int pthread_create(pthread_t *thread, const pthread_attr_t *attr,
//                          void *(*start_routine) (void *), void *arg);
//	int pthread_join(pthread_t thread, void **retval);



void *func1(void *arg)
{	
	static int ret = 10;	

	printf("t1:%ld thread is create\n",(unsigned long)pthread_self());
	printf("t1:param is %d\n",*((int *)arg));

	pthread_exit((void *)&ret);
}



int main()
{
	int ret;
	int param = 100;
	pthread_t t1;

	int *pret = NULL;

	ret = pthread_create(&t1,NULL,func1,(void *)&param);

	if(ret == 0){
		printf("main:cread t1 success\n");
	}
	printf("main:%ld\n",(unsigned long)pthread_self());
//	while(1);
	pthread_join(t1,(void **)&pret);

	printf("main:t1 quit: %d\n ",*pret);

	return 0;
}

线程的等待

#include <pthread.h>
#include <stdio.h>
//       int pthread_create(pthread_t *thread, const pthread_attr_t *attr,
//                          void *(*start_routine) (void *), void *arg);
//	int pthread_join(pthread_t thread, void **retval);



void *func1(void *arg)
{	
	static int ret = 10;	
	static char *p = "this is run out";

	printf("t1:%ld thread is create\n",(unsigned long)pthread_self());
	printf("t1:param is %d\n",*((int *)arg));

	pthread_exit((void *)p);
}



int main()
{
	int ret;
	int param = 100;
	pthread_t t1;

	char *pret = NULL;

	ret = pthread_create(&t1,NULL,func1,(void *)&param);

	if(ret == 0){
		printf("main:cread t1 success\n");
	}
	printf("main:%ld\n",(unsigned long)pthread_self());
//	while(1);
	pthread_join(t1,(void **)&pret);

	printf("main:t1 quit: %s\n ",pret);

	return 0;
}