Part 1 of file descriptor race and deadlock corrections.

File status flags should be shared for dup'ed file descriptors.
However fd_table_entry's should not be shared for dup'ed file
descriptors so they can be independently be closed without
interfering with dup'ed fd's.

- split out file status flags into its own structure
fs_flags to manage sharing of status flags between
dup'ed file descriptors.
- when duplicating a fd, initialize a new fd_table_entry
for the new fd, but share the status flags via status_flags.
- consolidate the code that sets the underlying system fd
to be non-blocking to a new function _thread_fs_flags_init()
- consolidate the code that sets the underlying system
fd back to blocking into a new function _thread_fs_flags_replace()

This change is needed as a prerequisite to the coming race
and deadlock corrections. okay marc@

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/libpthread/uthread/uthread_exit.c b/lib/libpthread/uthread/uthread_exit.c
index 91f41343583..94fc1699c37 100644
--- a/lib/libpthread/uthread/uthread_exit.c
+++ b/lib/libpthread/uthread/uthread_exit.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: uthread_exit.c,v 1.17 2002/11/07 02:56:20 marc Exp $	*/
+/*	$OpenBSD: uthread_exit.c,v 1.18 2006/09/22 19:04:33 kurt Exp $	*/
 /*
  * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
  * All rights reserved.
@@ -67,7 +67,7 @@ _exit(int status)
 	for (i = 0; i < _thread_dtablesize; i++) {
 		/* Check if this file descriptor is in use: */
 		if (_thread_fd_table[i] != NULL &&
-			!(_thread_fd_table[i]->flags & O_NONBLOCK)) {
+			!(_thread_fd_table[i]->status_flags->flags & O_NONBLOCK)) {
 			/* Get the current flags: */
 			flags = _thread_sys_fcntl(i, F_GETFL, NULL);
 			/* Clear the nonblocking file descriptor flag: */