This README.TXT file documents changes made to the ICL XINU C SDK API Library

===============================================================================
                                    v1.43
===============================================================================

Summary
   Maintenance release.

New Features/Changes
   - None.

Fixed Problems
   - v1.42 was improperly released - had files from development branch instead
     of maintenance branch.

===============================================================================
                                    v1.42
===============================================================================

Summary
   Maintenance release.

New Features/Changes
   - SemShutdown function added - waits on semaphore, deletes it, and sets
     semaphore ID to kXinuIllegalSemID.
   - Added ThreadKillAll function - kills all but the current thread.
   - Added stat function to list of thread protected runtime library functions.
   - Vers.h was renamed VersXinu.h to avoid conflicts with other ICL libraries.

Fixed Problems
   - Made it so application program can call exit and have it kill all threads,
     clean up properly and exit to DOS.

===============================================================================
                                    v1.41
===============================================================================

Summary
   Maintenance release.

New Features/Changes
   - Added XAvailMemPara() function, which returns the number of (16-byte)
     paragraphs of free memory in the Xinu heap.
   - Added XSetRsvdMemSize() to allow DOS memory to be reserved (not included
     in the Xinu heap). This was added to support DOS system() calls while Xinu
     is running.

Fixed Problems
   - None.

===============================================================================
                                    v1.40
===============================================================================

Summary
   Maintenance release.

New Features/Changes
   - vprintf was added to the list of "protected" (made thread-safe) runtime
     library functions.
   - Debug information is now stripped from the libraries.
   - Increased the initial thread stack from 2048 to 5000 bytes.
   - Added functions to get and set thread priority.
   - Added error message printout if stack overflow occurs.
   - Added new value kIllegalSemID to represent illegal semaphore ID.

Fixed Problems
   - Eliminated a narrow window of vulnerability in the timer ISR, which could
     allow other interrupts to occur at a time when they would not be handled
     properly (could cause thread/system lockups).
   - Problem in makefile was causing libraries to be compiled as 8086 for all
     compiler versions, as opposed to generating 80386 code for 4.5 and 5.0
     compilers.
   - Changed makefile to cause in and out I/O instructions to be generated
     inline, instead of using function calls (which is the default behavior in
     BC 5.0). This reduced execution time in timer ISR.

===============================================================================
                                    v1.30
===============================================================================

Summary
   Maintenance release.

New Features/Changes
   - None.

Fixed Problems
   - Communications lockups could occur at high baud rates when multiple COM
     ports were used simultaneously.