From 93bf62580a68533dc8252b9a2a055c02f34ecb67 Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Thu, 24 Mar 2022 09:38:08 -0700
Subject: Modularized

---
 src/util/mutex.c | 110 -------------------------------------------------------
 1 file changed, 110 deletions(-)
 delete mode 100644 src/util/mutex.c

(limited to 'src/util/mutex.c')

diff --git a/src/util/mutex.c b/src/util/mutex.c
deleted file mode 100644
index 8e85f8f..0000000
--- a/src/util/mutex.c
+++ /dev/null
@@ -1,110 +0,0 @@
-#include <cpu.h>
-#include <drivers/uart.h>
-#include <util/mutex.h>
-#include <util/lock.h>
-#include <globals.h>
-
-void mutex_init(void)
-{
-	for (unsigned long m = 0; m < MAX_MUTEXS; m++) {
-		mutexs[m].pid = 0;
-		mutexs[m].addr = 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;
-	// Initialize In-use Mutexs
-	mutex_manager.used.start.value = 0;
-	mutex_manager.used.start.next = &mutex_manager.used.end;
-	mutex_manager.used.start.entry_type = START_ENTRY;
-	mutex_manager.used.end.value = 0;
-	mutex_manager.used.end.next = &mutex_manager.used.start;
-	mutex_manager.used.end.entry_type = END_ENTRY;
-}
-
-struct Mutex* create_mutex(void* addr)
-{
-	struct Entry* e = pop_from_queue(&mutex_manager.free);
-	if (e == 0)
-		return 0;
-	struct Mutex* m = e->value;
-	m->pid = 0;
-	m->addr = addr;
-	push_to_queue(e, &mutex_manager.used);
-	return e->value;
-}
-
-unsigned char delete_mutex(struct Mutex* m)
-{
-	struct Entry* entry = find_value(m, &mutex_manager.used);
-	if (entry == 0)
-		return 1;
-	// Remove it from the queue
-	struct Entry* theentry = remove_next_from_queue(entry);
-	// Add it to the free queue
-	prepend_to_queue(theentry, &mutex_manager.free);
-	return 0;
-}
-
-void uart_mutexes(void)
-{
-	struct Entry* entry = mutex_manager.used.start.next;
-	while (entry->entry_type == VALUE_ENTRY)
-	{
-		struct Mutex* m = entry->value;
-		uart_hex((unsigned long)m);
-		uart_char(' ');
-		uart_hex(m->pid);
-		uart_char(' ');
-		uart_hexn((unsigned long)m->addr);
-		entry = entry->next;
-	}
-	unsigned long count = 0;
-	entry = mutex_manager.free.start.next;
-	while (entry->entry_type == VALUE_ENTRY) {
-		count++;
-		entry = entry->next;
-	}
-	uart_hexn(count);
-}
-
-void lock_mutex(struct Mutex* m)
-{
-	struct Thread* rthread = scheduler.rthread;
-	unsigned long rpid = rthread->pid;
-	unsigned long mode = getmode() & 0x1F;
-	if (mode == 0x10) {
-		// Find this mutex
-		struct Entry* mentry = find_value(m, &mutex_manager.used);
-		// If it is not a managed mutex, break away
-		if (mentry == 0)
-			return;
-		struct Entry* entry = mutex_manager.used.start.next;
-		// Ensure this thread locks all mutexs sequentially
-		//  To avoid a deadlock
-		while (entry->entry_type == VALUE_ENTRY) {
-			struct Mutex* vmutex = entry->value;
-			// If this thread had locked it
-			//  Toggle the lock to prevent deadlock
-			if (vmutex->pid == rpid) {
-				sys1(SYS_UNLOCK, vmutex);
-				sys1(SYS_LOCK, vmutex);
-			}
-			entry = entry->next;
-		}
-		sys1(SYS_LOCK, m);
-	}
-}
-
-void unlock_mutex(struct Mutex* m)
-{
-	unlock((struct Lock*)m);
-}
-- 
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