ex10_1a.c

linux 高级编程的例子源码,包括了本书上的所有代码

/*filename:ex7_1.c*/
#include <stdio.h>
#include <errno.h>
#include<pthread.h>
#include<unistd.h>
#define THREAD_NUM 2

void *my_thread(void *arg)
{
	pthread_t id;
	int *nump;
	int num;
	int retval;

	nump=(int*)(arg);
	num=*nump;
	printf("thread %d:started\n",num);
	id= pthread_self();
	printf("thread %d:ID is %ld\n",num,id);
	retval=100+num;
	printf("thread %d:exit with %d\n",num,retval);
	pthread_exit(&retval);

}
int main()
{
	int count;
	pthread_t thread[THREAD_NUM+1];
	int *retval[THREAD_NUM+1];
  
	count=1;
	while(count<=THREAD_NUM)
	{
		printf("Create thread %d\n",count);		
		if (pthread_create(&thread[count],NULL,my_thread,(void*)(&count))!=0)
		{
			fprintf(stderr,"Count not create thread %d:%s\n",count,strerror(errno));
		}
		count++;
		
	}
	for (count=1;count<=THREAD_NUM;count++)
	{
		if (pthread_join(thread[count],(void **)(&retval[count]))!=0)
		{
			fprintf(stderr,"No thread %d to join:%s\n",count,strerror(errno));
		}
		else
		{
			printf("Thread %d returned %d\n",count,*retval[count]);
		}
	}
	exit(0);
}