Begin review of taking model : making things thread safe.

1 files changed, 21 insertions, 0 deletions

diff --git a/kernel/include/mutex.h b/kernel/include/mutex.h
new file mode 100644
index 0000000..6814adf
--- /dev/null
+++ b/kernel/include/mutex.h
@@ -0,0 +1,21 @@
+#pragma once
+
+#include <stdint.h>
+
+#define MUTEX_LOCKED 1
+#define MUTEX_UNLOCKED 0
+
+
+typedef uint32_t mutex_t;
+
+void mutex_lock(mutex_t* mutex);	//wait for mutex to be free
+int mutex_try_lock(mutex_t* mutex);	//lock mutex only if free, returns !0 if locked, 0 if was busy
+void mutex_unlock(mutex_t* mutex);
+
+// the mutex code assumes a yield() function is defined somewhere
+void yield();
+
+#define STATIC_MUTEX(name) static mutex_t name __attribute__((section("locks"))) = MUTEX_UNLOCKED;
+	
+
+/* vim: set ts=4 sw=4 tw=0 noet :*/