Add lock file

src/utils/lock_file.cpp

@@ -0,0 +1,18 @@
+#include <utils/lock_file.hpp>
+
+#include <unistd.h>
+#include <sys/file.h>
+
+namespace utils::filesystem {
+void LockFile::Lock() {
+  fd_ = open(path_.data(), O_RDWR | O_CREAT, 0666);
+  while (flock(fd_, LOCK_EX) != 0) {
+  }
+}
+
+void LockFile::Unlock() {
+  while (flock(fd_, LOCK_UN) != 0) {
+  }
+  close(fd_);
+}
+}  // namespace utils::filesystem

src/utils/lock_file.hpp

@@ -0,0 +1,19 @@
+#pragma once
+#include <string>
+
+namespace utils::filesystem {
+class LockFile {
+ public:
+  LockFile(std::string path) : path_(std::move(path) + ".lock") {}
+
+  void Lock();
+  void lock() { Lock(); }
+
+  void Unlock();
+  void unlock() { Unlock(); }
+
+ private:
+  std::string path_;
+  int fd_ = -1;
+};
+}  // namespace utils::filesystem