Selects query inside function must read commited data

Dear all ,

Would like to receive your kind attention and enormous knowledge on the
following

I have a function
sai_func_a()
Which does as follows and in the same order:
1. Retrieves the latest record from the table test_sai
(By latest I mean the record corresponding to max primary key of the
table)
2. Increments date as received from test_sai.current_date
as my_new_date := test_sai.current_date + 1 ;
3. Inserts the new date into the same table test_sai
4. Calls another function sai_func_b()
Now inside sai_func_b()
1. Does as #1 of above
2. Works on the date in the last record.
3. Returns success code to sai_func_a()
5. The sai_func_a() finishes the work

Now My question :
Since sai_func_a() which encapsulates the function sai_func_b has not
completed yet till #4 or #5
then how does the function sai_func_b reads the new data since it is not
committed yet.

If I am not wrong PostgreSQL select statements works on committed data
thus the new
inserted data at #3 must not be available to sai_func_b() till #5

Server Specs:
1. version
---------------------------------------------------------------------------------------------------------
PostgreSQL 7.3.4 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.2.2
20030222 (Red Hat Linux 3.2.2-5)
2.Both functions are plpgsql and are not triggers

If you need more information kindly ask for the same.

--
Regards,
Vishal Kashyap

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