initial commit of lk (little kernel) project
diff --git a/include/kernel/mutex.h b/include/kernel/mutex.h
new file mode 100644
index 0000000..2bdf8f4
--- /dev/null
+++ b/include/kernel/mutex.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2008 Travis Geiselbrecht
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef __KERNEL_MUTEX_H
+#define __KERNEL_MUTEX_H
+
+#include <kernel/thread.h>
+
+#define MUTEX_MAGIC 'mutx'
+
+typedef struct mutex {
+ int magic;
+ int count;
+ thread_t *holder;
+ wait_queue_t wait;
+} mutex_t;
+
+void mutex_init(mutex_t *);
+void mutex_destroy(mutex_t *);
+status_t mutex_acquire(mutex_t *);
+status_t mutex_acquire_timeout(mutex_t *, time_t); /* try to acquire the mutex with a timeout value */
+status_t mutex_release(mutex_t *);
+
+#endif
+