vlib: use new filename format

vlib/sync/sync_nix.c.v

@@ -0,0 +1,32 @@
+// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+module sync
+
+#include <pthread.h>
+fn C.pthread_mutex_init()
+
+
+fn C.pthread_mutex_lock()
+
+
+fn C.pthread_mutex_unlock()
+// [init_with=new_mutex] // TODO: implement support for this struct attribute, and disallow Mutex{} from outside the sync.new_mutex() function.
+pub struct Mutex {
+	mutex C.pthread_mutex_t
+}
+
+pub fn new_mutex() &Mutex {
+	m := &Mutex{}
+	C.pthread_mutex_init(&m.mutex, C.NULL)
+	return m
+}
+
+pub fn (m mut Mutex) lock() {
+	C.pthread_mutex_lock(&m.mutex)
+}
+
+pub fn (m mut Mutex) unlock() {
+	C.pthread_mutex_unlock(&m.mutex)
+}
+