From 75c5ec7b90a5cb1057520a8051ce5033212c77be Mon Sep 17 00:00:00 2001
From: Julian Graham <julian@smokebottle.(none)>
Date: Sat, 24 May 2008 19:11:12 -0400
Subject: [PATCH] Update NEWS file for SRFI-18 and associated core thread changes

---
 NEWS |   60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 files changed, 58 insertions(+), 2 deletions(-)

diff --git a/NEWS b/NEWS
index 5f84659..a52378b 100644
--- a/NEWS
+++ b/NEWS
@@ -12,6 +12,7 @@ Changes in 1.9.0:
 * New modules (see the manual for details)
 
 ** The `(ice-9 i18n)' module provides internationalization support
+** `(srfi srfi-18)'
 
 * Changes to the distribution
 
@@ -26,14 +27,69 @@ be used for efficiently implementing a Scheme code coverage.
 ** Duplicate bindings among used modules are resolved lazily.
 This slightly improves program startup times.
 
-** New thread cancellation and thread cleanup API
-See `cancel-thread', `set-thread-cleanup!', and `thread-cleanup'.
+** Changes and additions to the thread and synchronization API
+
+There is a new thread cancellation and thread cleanup API.  See
+`cancel-thread', `set-thread-cleanup!', and `thread-cleanup' in the
+manual for details.
+
+New predicates `mutex?', `condition-variable?', and `mutex-locked?'
+have been added.
+
+Functions for examining the state of a locked mutex, `mutex-level' and
+`mutex-owner', have been added.
+
+Some of the existing thread functions now take optional arguments that
+extend their functionality: `make-mutex' now accepts zero or more
+flags that allow the user to configure various aspects of the behavior
+of the returned mutex; `join-thread' and `lock-mutex' now accept
+timeout arguments that allow users to limit the amount of time those
+functions will wait; `join-thread' also now has the ability to return
+a failure value of the caller's choosing, in order to distinguish
+between timeout and threads returning #f; `unlock-mutex' can now 
+optionally wait for a specified condition variable to be signaled 
+before returning.  See the manual for details.
+
+Threads waiting on a locked mutex will now be notified if the owner
+exits before unlocking it.
 
 * Changes to the C interface
 
 ** Functions for handling `scm_option' now no longer require an argument
 indicating length of the `scm_t_option' array.
 
+** Corresponding C functions for the thread API enhancements have been
+** added
+
+These functions provide access to the new features provided by the 
+Scheme thread API enhancements described above.  Where changes to the 
+signatures of the existing C API would have been required, new functions
+with distinct names have been introduced, in order to preserve backwards 
+compatibility with existing code.
+
+  Synchronization type predicates:
+
+  - SCM scm_mutex_p (SCM obj)
+  - SCM scm_condition_variable_p (SCM obj)
+
+  Timeout and other enhancements for existing thread primitives:
+
+  - SCM scm_lock_mutex_timed (SCM m, SCM timeout, SCM owner)
+  - SCM scm_join_thread_timed (SCM t, SCM timeout, SCM timeoutval)
+  - SCM scm_unlock_mutex_timed (SCM m, SCM cond, SCM timeout)
+  - SCM scm_make_mutex_with_flags (SCM flags)
+
+  Thread cancellation and cleanup:
+
+  - SCM scm_cancel_thread (SCM t)
+  - SCM scm_set_thread_cleanup_x (SCM thread, SCM proc)
+  - SCM scm_thread_cleanup (SCM thread)
+
+  Mutex inspection:
+
+  - SCM scm_mutex_owner (SCM m)
+  - SCM scm_mutex_level (SCM m)
+  - SCM scm_mutex_locked_p (SCM m)
 
 
 Changes in 1.8.5 (since 1.8.4)
-- 
1.5.4.3