lib: c: add pthread implementation

lib/libc/pthread/thread/pthread.h

@@ -0,0 +1,24 @@
+#ifndef _THREAD_PTHREAD_H_
+#define _THREAD_PTHREAD_H_
+
+#include <mango/types.h>
+
+enum pthread_flags {
+	THREAD_DETACHED = 0x01u,
+};
+
+struct __pthread {
+	struct __pthread *thr_self;
+	enum pthread_flags thr_flags;
+	kern_handle_t thr_handle;
+	void *thr_map_base;
+	size_t thr_map_size;
+	void *thr_result;
+};
+
+extern void __pthread_unmap_exit(
+	kern_handle_t address_space,
+	void *unmap_base,
+	size_t unmap_length);
+
+#endif