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revision 1.363 by ossau, Sun Oct 27 13:38:24 2002 UTC revision 1.364 by mvo, Sun Oct 27 20:36:45 2002 UTC
# Line 43  debugging evaluator gives better error m Line 43  debugging evaluator gives better error m
43    
44  * Changes to Scheme functions and syntax  * Changes to Scheme functions and syntax
45    
46    ** Mutexes are now recursive.
47    
48    Locking a mutex that you have already locked will now succeed.  Every
49    call to lock-mutex must be matched with a call to unlock-mutex.  Only
50    the last call to unlock-mutex will actually unlock the mutex.
51    
52    ** New function 'try-mutex'.
53    
54    This function will attempt to lock a mutex but will return immediately
55    instead if blocking, indicating failure.
56    
57    ** Waiting on a condition variable can have a timeout.
58    
59    The funtion 'wait-condition-variable' now takes a third, optional
60    argument that specifies the point in time where the waiting should be
61    aborted.
62    
63    ** New function 'broadcast-condition-variable'.
64    
65  ** New functions 'all-threads' and 'current-thread'.  ** New functions 'all-threads' and 'current-thread'.
66    
67  ** Signals and system asyncs work better with threads.  ** Signals and system asyncs work better with threads.

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