From 214dd7cfdb452f912941feb32e946089b5db80a1 Mon Sep 17 00:00:00 2001
From: "Michael I. Bushnell" <mib@gnu.org>
Date: Wed, 2 Aug 1995 16:31:46 +0000
Subject: Formerly system.h.~2~

---
 pfinet/asm/system.h | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/pfinet/asm/system.h b/pfinet/asm/system.h
index e69de29b..a631c91e 100644
--- a/pfinet/asm/system.h
+++ b/pfinet/asm/system.h
@@ -0,0 +1,48 @@
+#include <cthreads.h>
+
+/* This lock is held when "interrupts" are disabled. */
+extern struct mutex global_interrupt_lock;
+
+/* Save the "processor state" in the longword FLAGS. */
+/* We define 1 to mean that global_interrupt_lock is held. */
+
+#define save_flags(x) _real_save_flags (&x)
+extern inline void 
+_real_save_flags (u_long *flagsword)
+{
+  int locked;
+  
+  locked = !mutex_try_lock (&global_interrupt_lock);
+  if (!locked)
+    mutex_unlock (&global_interrupt_lock);
+  *flagsword = locked;
+}
+
+/* Restore state saved in FLAGS. */
+extern inline void
+restore_flags (u_long flags)
+{
+  if (flags)
+    mutex_try_lock (&global_interrupt_lock);
+  else
+    mutex_unlock (&global_interrupt_lock);
+}
+
+/* Prevent "interrupts" from happening. */
+extern inline void 
+cli ()
+{
+  mutex_try_lock (&global_interrupt_lock);
+}
+
+/* Permit "interrupts". */ 
+extern inline void
+sti ()
+{
+  mutex_unlock (&global_interrupt_lock);
+}
+
+
+
+
+  
-- 
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