Add thread-local caches for file locks and handles in fd_pool

cpp/src/Private/sweepstore/utils/fd_pool.cpp

@@ -0,0 +1,12 @@
+#include "sweepstore/utils/file_lock.h"
+#include "sweepstore/utils/file_handle.h"
+
+// Thread-local FD cache definition for file locking
+#ifndef _WIN32
+thread_local std::unordered_map<std::string, int> SweepstoreFileLock::fdCache;
+#endif
+
+// Thread-local stream cache definition for file handles
+#ifndef WITH_UNREAL
+thread_local std::unordered_map<std::string, std::unique_ptr<std::fstream>> SweepstoreFileHandle::streamCache;
+#endif