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+                   Things that aren't done yet
+                   ---------------------------
+
+1. Implement PTHREAD_PROCESS_SHARED for semaphores, mutexes,
+   condition variables, read/write locks, barriers.
+   
+   IMO, to do this in a source code compatible way requires implementation of
+   POSIX shared memory functions, etc.
+
+2. For version 3 onwards: the following types need to change, resulting in an ABI
+   change. These have been written conditional on PTW32_VERSION_MAJOR > 2
+
+   a) ptw32_handle_t (a.k.a. pthread_t)
+   Change the reuse counter from unsigned int to size_t. Type "int" on 32 bit
+   and 64 bit Windows is 32 bits wide.
+   
+   To give an indication of relative effectiveness of the current "unsigned int",
+   consider an application that creates and detaches a single thread every 
+   millisecond. At this rate the reuse counter will max out after 49 days.
+
+   After changing to "size_t" an application compiled for x64 and creating and
+   detaching a single thread every nanosecond would max out after 584 years.
+
+   b) pthread_once_t
+   Remove elements no longer required after switching to use of MCS lock.
+   
+\ No newline at end of file