Hi all.
I have a multithread application running on a multiprocessor ( 2 thread
can be running at the same time).
Suppose I have 2 thread:
t1  lists the content of a directory (using opendir and readdir_r) and
t2 delete a file.

Suppose also I have a directory /home that contains 2 file txt1 and
txt2.

Consider this scenario:
t1 read and print the content of /home
t2 delete txt1.

if t1 and t2 are running at the same time there are 3 possibility:
1.: t2 deletes txt1 first that t1 reads it with readdir_r
(IN THIS CASE THE OUTPUT OF T1 IS : TXT2)
2.: t2 deletes txt1 after t1 has read it with readdir_r
(IN THIS CASE THE OUTPUT OF T1 IS : TXT1 TXT2 ALSO IF TXT1 DOESN'T
EXIST)
3.: t2 deletes txt1 at the same time t1 reads it with readdir_r

WHAT APPENS IN THIS CASE? CAN THIS OPERATION BE OVERLAPPED?
THANKS ALL.

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"gio" <giorginooo.rossi@yahoo.it> writes:

> Hi all.
> I have a multithread application running on a multiprocessor ( 2 thread
> can be running at the same time).
> Suppose I have 2 thread:
> t1  lists the content of a directory (using opendir and readdir_r) and
> t2 delete a file.
>
> Suppose also I have a directory /home that contains 2 file txt1 and
> txt2.
>
> Consider this scenario:
> t1 read and print the content of /home
> t2 delete txt1.
>
> if t1 and t2 are running at the same time there are 3 possibility:
> 1.: t2 deletes txt1 first that t1 reads it with readdir_r
>     (IN THIS CASE THE OUTPUT OF T1 IS : TXT2)
> 2.: t2 deletes txt1 after t1 has read it with readdir_r
>     (IN THIS CASE THE OUTPUT OF T1 IS : TXT1 TXT2 ALSO IF TXT1 DOESN'T
> EXIST)
> 3.: t2 deletes txt1 at the same time t1 reads it with readdir_r
>
> WHAT APPENS IN THIS CASE? CAN THIS OPERATION BE OVERLAPPED?
> THANKS ALL.

And you think it will help posting your very same question to a
bazillion different newsgroups?


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