From 8a8c8303d12188df2bb0578af31c18c7746f067b Mon Sep 17 00:00:00 2001
From: dnflekals <dnflekals@DESKTOP-MFES181.localdomain>
Date: Thu, 4 Jun 2020 14:34:17 +0900
Subject: [PATCH] finish spinlock
---
pa3.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/pa3.c b/pa3.c
index 634dd81..bf77e96 100644
--- a/pa3.c
+++ b/pa3.c
@@ -33,7 +33,7 @@
* Spinlock implementation
*********************************************************************/
struct spinlock {
-
+ int held;
};
/*********************************************************************
@@ -44,6 +44,7 @@ struct spinlock {
*/
void init_spinlock(struct spinlock *lock)
{
+ lock->held=0;
return;
}
@@ -58,6 +59,8 @@ void init_spinlock(struct spinlock *lock)
*/
void acquire_spinlock(struct spinlock *lock)
{
+ while(lock->held);
+ lock->held=1;
return;
}
@@ -72,6 +75,7 @@ void acquire_spinlock(struct spinlock *lock)
*/
void release_spinlock(struct spinlock *lock)
{
+ lock->held = 0;
return;
}
--
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