intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 34 insertions, 0 deletions

diff --git a/util/system/file_lock.h b/util/system/file_lock.h
new file mode 100644
index 00000000000..b2aaff5baf8
--- /dev/null
+++ b/util/system/file_lock.h
@@ -0,0 +1,34 @@
+#pragma once
+
+#include <util/generic/fwd.h>
+#include <util/generic/noncopyable.h>
+#include <util/system/file.h>
+
+enum class EFileLockType {
+    Exclusive,
+    Shared
+};
+
+class TFileLock: public TFile {
+public:
+    TFileLock(const TString& filename, const EFileLockType type = EFileLockType::Exclusive);
+
+    void Acquire();
+    bool TryAcquire();
+    void Release();
+
+    inline void lock() {
+        Acquire();
+    }
+
+    inline bool try_lock() {
+        return TryAcquire();
+    }
+
+    inline void unlock() {
+        Release();
+    }
+
+private:
+    EFileLockType Type;
+};