From 41a7818b552aef9e6e0bf788089f6ae16ae1e421 Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Fri, 26 Aug 2022 23:27:46 -0700
Subject: Mutex wait queues

---
 kernel/util/mutex.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

(limited to 'kernel/util')

diff --git a/kernel/util/mutex.c b/kernel/util/mutex.c
index 997d85d..b05aee3 100644
--- a/kernel/util/mutex.c
+++ b/kernel/util/mutex.c
@@ -9,18 +9,14 @@ void mutex_init(void)
 	for (unsigned long m = 0; m < MAX_MUTEXS; m++) {
 		mutexs[m].pid = 0;
 		mutexs[m].addr = 0;
+		mutexs[m].locking_thread = 0;
+		mutexs[m].waiting_threads = 0;
 		mutex_entries[m].value = &mutexs[m];
-		mutex_entries[m].entry_type = VALUE_ENTRY;
 		mutex_entries[m].next = &mutex_entries[m+1];
 	}
 	// Initialize Free Mutexs
-	mutex_manager.free.start.value = 0;
 	mutex_manager.free.start.next = &mutex_entries[0];
-	mutex_manager.free.start.entry_type = START_ENTRY;
-	mutex_manager.free.end.value = 0;
-	mutex_manager.free.end.next = &mutex_entries[MAX_MUTEXS-1];
-	mutex_entries[MAX_MUTEXS-1].next = &mutex_manager.free.end;
-	mutex_manager.free.end.entry_type = END_ENTRY;
+	mutex_entries[MAX_MUTEXS-1].next = 0;
 }
 
 struct Mutex* create_mutex(void* addr)
@@ -44,7 +40,8 @@ unsigned char delete_mutex(struct Mutex* m)
 		return 1;
 	struct Entry* entry = &mutex_entries[index];
 	// Add it to the free queue
-	prepend_to_queue(entry, &mutex_manager.free);
+	push_to_queue(entry, &mutex_manager.free);
+	mutex_manager.used_mutexes--;
 	return 0;
 }
 
@@ -67,6 +64,7 @@ unsigned char lock_mutex(struct Mutex* m)
 		if ((unsigned char) index > rthread->highest_mutex)
 			return 2;
 		sys1(SYS_LOCK, m);
+		m->locking_thread = &mutex_entries[index];
 		return 0;
 	}
 	return 3;
-- 
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