1 files changed, 32 insertions, 0 deletions
diff --git a/include/sys/mutex.h b/include/sys/mutex.h
new file mode 100644
index 0000000..f682e02
--- /dev/null
+++ b/include/sys/mutex.h
@@ -0,0 +1,32 @@
+#include <avr/io.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "../tasks.h"
+
+#ifndef _IOE_SYS_MUTEX_H_
+#define _IOE_SYS_MUTEX_H_
+#ifdef CONFIG_IOE_MUTEX
+
+#define MUTEX_F_TIMED (1<<0)
+#define MUTEX_F_TAKEN (1<<7)
+#define mutex_t volatile struct Mutex
+struct Mutex {
+    uint8_t flags;
+    Task *_task_took;
+};
+int8_t mutex_init(struct Mutex * mtx);
+int8_t mutex_free(struct Mutex * mtx);
+int8_t mutex_take(struct Mutex * mtx, uint16_t timeout);
+int8_t mutex_give(struct Mutex * mtx);
+
+#else /* CONFIG_IOE_MUTEX */
+
+#define mutex_t struct { }
+#define mutex_init(MTX, FLAGS)
+#define mutex_free(MTX)
+#define mutex_take(MTX, TIMEOUT)
+#define mutex_give(MTX);
+
+#endif /* CONFIG_IOE_MUTEX */
+#endif /* _IOE_SYS_MUTEX_H_ */