From a0d6941b2ef689302dce37d1a864fd4213a0a559 Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Sun, 13 Feb 2022 17:13:17 -0700
Subject: Implement generic lock

---
 include/util/lock.h  | 12 ++++++++++++
 include/util/mutex.h |  6 ++++--
 2 files changed, 16 insertions(+), 2 deletions(-)
 create mode 100644 include/util/lock.h

(limited to 'include/util')

diff --git a/include/util/lock.h b/include/util/lock.h
new file mode 100644
index 0000000..78add88
--- /dev/null
+++ b/include/util/lock.h
@@ -0,0 +1,12 @@
+#ifndef UTIL_LOCK_H
+#define UTIL_LOCK_H
+
+#include <util/mutex.h>
+
+struct Lock {
+	unsigned long pid;
+} __attribute__((packed, aligned(4)));
+
+struct Lock* create_lock(void);
+
+#endif
diff --git a/include/util/mutex.h b/include/util/mutex.h
index 907fe5b..61237b8 100644
--- a/include/util/mutex.h
+++ b/include/util/mutex.h
@@ -8,10 +8,12 @@
 #define CORE3_PID 4
 #define FIRST_AVAIL_PID CORE3_PID+1
 
+// PID field is first so that it can be treated
+//  as a lock
 struct Mutex {
-	void* addr;
 	unsigned long pid;
-} __attribute__((packed, aligned(4)));;
+	void* addr;
+} __attribute__((packed, aligned(4)));
 
 struct Mutex* create_mutex(void* addr);
 
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