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diff --git a/mit-pthreads/machdep/engine-ip22-irix-5.2.h b/mit-pthreads/machdep/engine-ip22-irix-5.2.h
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+/* ==== machdep.h ============================================================
+ * Copyright (c) 1994 Chris Provenzano, proven@athena.mit.edu
+ *
+ * $Id$
+ *
+ */
+
+#include <unistd.h>
+#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 0xff
+
+/*
+ * More machine dependent macros
+ */
+#ifdef PTHREAD_KERNEL
+
+#define machdep_save_float_state(x)
+#define machdep_restore_float_state()
+
+#endif
+
+/*
+ * New types
+ */
+typedef char semaphore;
+
+/*
+ * sigset_t macros
+ */
+#define SIGMAX 32
+#define SIG_ANY(sig) \
+({ \
+ sigset_t *sig_addr = (sigset_t *)&sig; \
+ int ret = 0; \
+ int i; \
+ \
+ for (i = 1; i <= SIGMAX; i++) { \
+ if (sigismember(sig_addr, i)) { \
+ ret = 1; \
+ break; \
+ } \
+ } \
+ ret; \
+})
+
+/*
+ * New Strutures
+ */
+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 }
+
+/*
+ * Minimum stack size
+ */
+#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
+
+/*
+ * 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 machdep_save_state __P_((void));
+
+#endif
+
+__END_DECLS