This patch corrects the following: This patch fixes the following problems: - * Hangs or unexpected termination of threaded processes with TotalView debugger. * Gcc compiler reports errors when including header file. - Fixes to libtli/libxti to correctly handle a continuation data message still on the stream head. - A potential security vulnerability has been discovered , where under certain circumstances, system integrity may be compromised. This may be in the form of improper file or privilege management. Digital has corrected this potential vulnerability. - Introduces changes to the DECthreads libraries intended to improve the performance of threaded applications running on Digital UNIX 4.0d. This patch specifically addresses the areas of thread scheduling, synchronization object performance and SMP scalability. - Fixes problems in the DECthreads library for Digital UNIX. Included in this patch are changes to support Ladebug enhancements and a bug fix for applications which employ SCS threads of different priorities. This patch addresses performance and scalibility issues for highly contended threaded applications running on SMP machines.