Problem Executing thread.

[Mukund JB.]

Hai all,
I have a query regarding the threads in Linux.
I wrote an application using the pthreads where in I was to read & write
asynchronously. The read  &* write functions are as follows :

void * read( void * X)
{
	int a =0;
	while(a< 1000)
	{
		printf("IN read thread %d\n",a);
		a++;
	}
	pthread_exit(0);
}

void * read( void * X)
{
	int b =0;
	while(b< 1000)
	{
		printf("IN write thread %d\n",b);
		b++;
	}
	pthread_exit(0);
}

The Output I get is just a series of 1000 read thread printf statements
and a series of 1000 write thread printf statements. Its like as
follows:-

IN read thread 0
IN read thread 1
IN read thread 2
IN read thread 3
.......
.......
.......
IN read thread 1000
IN write thread 0
IN write thread 1
IN write thread 2
IN write thread 3
.......
.......
.......
IN write thread 1000

Why is this happening? 
Why are my threads getting executed one after the other rather than
simultaneously.


Thanks for the help in advance.

Regards,
Mukund jampala