select system call queries

[arnab]

Hi All,
I have the following code snippet.
pthread_mutex_lock()
select()-> for read file descriptors with timeout of 25 sec
accept()
pthread_mutex_release()

I removed the locks of pthread_mutex_lock/and release as socket
libraries are thread safe.
Now my question is there a possibility of hang in the select function
when read file descriptors are not available?Also can the timeout of
25 sec contribute to the hang?
How can I check the read_fds are not available or the threshold is
being reached.
Any comments or suggestions would be very much appreciated.
Thanks
Arnab