From a29f40e073a0308bd74f0f9803a4660aa233c3ab Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Sat, 12 Mar 2022 16:39:39 -0800
Subject: "Dynamic" Mutex Allocation

---
 src/globals.c    |  3 +++
 src/util/lock.c  |  1 +
 src/util/mutex.c | 26 ++++++++++++++++++++++++++
 3 files changed, 30 insertions(+)

(limited to 'src')

diff --git a/src/globals.c b/src/globals.c
index 29760b6..c704cb4 100644
--- a/src/globals.c
+++ b/src/globals.c
@@ -1,5 +1,6 @@
 #define GLOBALS_C
 #include <sys/schedule.h>
+#include <util/mutex.h>
 char* os_name = "Jobbed";
 #ifndef VERSION
 char* os_info_v = "?";
@@ -16,6 +17,8 @@ __attribute__((section(".bss"))) unsigned int gwidth;
 __attribute__((section(".bss"))) unsigned int gheight;
 __attribute__((section(".bss"))) unsigned int gpitch;
 __attribute__((section(".bss"))) unsigned int gisrgb;
+__attribute__((section(".bss.mutexl"))) unsigned long mutex_table[MAX_MUTEXS];
+__attribute__((section(".bss.mutexs"))) struct Mutex mutexs[MAX_MUTEXS];
 // 0 - Free
 // 1 - Ready
 // 2 - Waiting for Mutex
diff --git a/src/util/lock.c b/src/util/lock.c
index 95f93af..eaeb5a8 100644
--- a/src/util/lock.c
+++ b/src/util/lock.c
@@ -1,5 +1,6 @@
 #include <cpu.h>
 #include <cpu/atomic/swap.h>
+#include <util/mutex.h>
 #include <util/lock.h>
 
 // TODO: Improve locking for system
diff --git a/src/util/mutex.c b/src/util/mutex.c
index e69de29..3171501 100644
--- a/src/util/mutex.c
+++ b/src/util/mutex.c
@@ -0,0 +1,26 @@
+#include <util/mutex.h>
+#include <globals.h>
+
+struct Mutex* create_mutex(void* addr)
+{
+	for (unsigned long m = 0; m < MAX_MUTEXS; m++) {
+		if (mutex_table[m] == 0) {
+			mutex_table[m] = (unsigned long)addr;
+			mutexs[m].pid = 0;
+			mutexs[m].addr = addr;
+			return &mutexs[m];
+		}
+	}
+	return 0;
+}
+
+unsigned char delete_mutex(struct Mutex* m)
+{
+	for (unsigned long i = 0; i < MAX_MUTEXS; i++) {
+		if (mutex_table[i] == (unsigned long)m->addr) {
+			mutex_table[i] = 0;
+			return 0;
+		}
+	}
+	return 1;
+}
-- 
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