On Mon, 07 May 2001 12:37:22 -0700 (PDT),
  John Baldwin <[EMAIL PROTECTED]> said:

John> You need the lock when clearing the bit in p_flag.  That is why the proc locks
John> are there, so all those proc locks need to stay.  When you clear a bit, you are
John> writing all the bits, so you need to ensure that you can atomically
John> read/modify/write all the bits in p_flag, hence the need for the proc lock.

John> Please back out the changes to not lock the process around the p_flag change. 
John> The rest of the patch looks ok, though I'd like to review the updated version
John> before it is committed.  Thanks.

Process locks are now back.

Here is another issue. PROC_LOCK may block to acquire a process lock,
during which an event of interest may occur or the remaining time of
select(2)/poll(2) may run out. Thus if the remaining time runs out
during locking a process, we should first rescan file descriptors to
avoid missing an event, followed by returning the result.

Those changes are now in the updated patch at:

>> http://people.FreeBSD.org/~tanimura/patches/selectopt.diff


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