多线程测试

编写多线程程序，主线程中开启两个线程，一个线程打印十个偶数随机数，一个线程打印十个奇数随机数。

#include	<stdio.h>
#include    <stdlib.h>
#include    <string.h>
#include    <unistd.h>
#include	<time.h>


#define	CHILD_MESS	"Odd:\n"
#define	PAR_MESS	"Even\n"
#define	oops(m,x)	{ perror(m); exit(x); }

main()
{
	int	pipefd[2];	
	int i=0,j=0;	
	int	len;			
	char	buf[BUFSIZ];		
	int	read_len;

	if ( pipe( pipefd ) == -1 )
		oops("cannot get a pipe", 1);

	switch( fork() ){
		case -1:
			oops("cannot fork", 2);
	
		case 0:			
			len = strlen(CHILD_MESS);
			while(1){
				if (write( pipefd[1], CHILD_MESS, len) != len ){
					oops("write", 3);
				}
			for(i;i<10;i++){
					srand((unsigned int)time(NULL));
					printf("奇数随机数为：%d\n",rand()*2+1);
					sleep(1);
				}
			}
		
		default:		
			len = strlen( PAR_MESS );
			while(1){
				if ( write( pipefd[1], PAR_MESS, len)!=len ){
					oops("write", 4);
				}
				for(j;j<10;j++){
					srand((unsigned int)time(NULL));
					printf("偶数随机数为：%d\n",rand()*2);
					sleep(1);
				}
				read_len = read( pipefd[0], buf, BUFSIZ );
				if ( read_len <= 0 )
					break;
				write( 1 , buf, read_len );
			}
	}
}