From 31085bb4166c18b3dee059160d64b4edd7c5e2f4 Mon Sep 17 00:00:00 2001
From: rsc <rsc>
Date: Thu, 7 Sep 2006 14:12:30 +0000
Subject: more comments

---
 spinlock.h | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

(limited to 'spinlock.h')

diff --git a/spinlock.h b/spinlock.h
index ae5ad1f..1a706cf 100644
--- a/spinlock.h
+++ b/spinlock.h
@@ -1,6 +1,10 @@
+// Mutual exclusion lock.
 struct spinlock {
-  char *name;
-  uint locked;
-  int cpu;
-  uint pcs[10];
+  uint locked;   // Is the lock held?
+  
+  // For debugging:
+  char *name;    // Name of lock.
+  int  cpu;      // The number of the cpu holding the lock.
+  uint pcs[10];  // The call stack (an array of program counters)
+                 // that locked the lock.
 };
-- 
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