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diff --git a/mit-pthreads/machdep/engine-r2000-ultrix-4.2.h b/mit-pthreads/machdep/engine-r2000-ultrix-4.2.h
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index 00000000000..8e2d70f8feb
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+++ b/mit-pthreads/machdep/engine-r2000-ultrix-4.2.h
@@ -0,0 +1,107 @@
+/* ==== machdep.h ============================================================
+ * Copyright (c) 1993 Chris Provenzano, proven@athena.mit.edu
+ *
+ * $Id$
+ *
+ *  Description : Machine dependent header for decstation with r2000/r3000
+ *				  running Ultrix-4.2
+ *
+ *  1.00 93/07/21 proven
+ *      -Started coding this file.
+ */
+
+#include <setjmp.h>
+#include <sys/time.h>
+#include <sys/cdefs.h>
+
+/*
+ * The first machine dependent functions are the SEMAPHORES
+ * needing the test and set instruction.
+ */
+#define SEMAPHORE_CLEAR 0
+#define SEMAPHORE_SET   1
+
+#define SEMAPHORE_TEST_AND_SET(lock)	semaphore_test_and_set(lock)
+#define SEMAPHORE_RESET(lock)			*lock = SEMAPHORE_CLEAR
+
+/*
+ * New types
+ */
+typedef long	semaphore;
+
+#if !defined(_POSIX_SOURCE)
+
+/* typedef int		ssize_t; */
+
+#if !defined(__GNUC__)
+
+/*
+ * sigset_t macros
+ */
+typedef int		sigset_t; 
+#define sigaddset(set, num)		((*set) |= (1 << (num - 1)))
+#define sigemptyset(set)		(*set = 0) 
+
+#endif
+#endif
+
+#define	SIG_ANY(sig)			(sig)
+#define SIGMAX 					31
+
+/*
+ * New Structures
+ */
+struct machdep_pthread {
+	void						*(*start_routine)(void *);
+	void						*start_argument;
+	void						*machdep_stack;
+	struct itimerval			machdep_timer;
+	jmp_buf						machdep_state;
+};
+
+/*
+ * Static machdep_pthread initialization values.
+ * For initial thread only.
+ */
+#define MACHDEP_PTHREAD_INIT	\
+{ NULL, NULL, NULL, { { 0, 0 }, { 0, 100000 } }, 0 }
+
+
+/*
+ * Min stacksize, arch dependent
+ */
+#define PTHREAD_STACK_MIN	1024
+
+/*
+ * Some fd flag defines that are necessary to distinguish between posix
+ * behavior and bsd4.3 behavior.
+ */
+#define __FD_NONBLOCK 		(O_NONBLOCK | O_NDELAY)
+
+/*
+ * New functions
+ */
+
+__BEGIN_DECLS
+
+#if defined(PTHREAD_KERNEL)
+
+#define __machdep_stack_get(x)		(x)->machdep_stack
+#define __machdep_stack_set(x, y)	(x)->machdep_stack = y
+#define __machdep_stack_repl(x, y)							\
+{															\
+	if (stack = __machdep_stack_get(x)) {					\
+		__machdep_stack_free(stack);						\
+	}														\
+	__machdep_stack_set(x, y);								\
+}
+
+void *	__machdep_stack_alloc		__P_((size_t));
+void	__machdep_stack_free		__P_((void *));
+
+int	semaphore_test_and_set			__P_((semaphore *));
+int machdep_save_state				__P_((void));
+
+#endif
+
+__END_DECLS