diff --git a/support/include/utils/config.hpp b/support/include/utils/config.hpp
index e995f7f0..719a6ca0 100644
--- a/support/include/utils/config.hpp
+++ b/support/include/utils/config.hpp
@@ -468,7 +468,7 @@ struct http_range final {
   std::uint64_t end{};
 };
 
-using http_headers = std::map<std::string, std::string>;
+using http_headers = std::unordered_map<std::string, std::string>;
 using http_query_parameters = std::map<std::string, std::string>;
 using http_ranges = std::vector<http_range>;
 #endif // defined(PROJECT_ENABLE_CURL)
diff --git a/support/include/utils/file_thread_file.hpp b/support/include/utils/file_thread_file.hpp
index 74cf110e..15234d80 100644
--- a/support/include/utils/file_thread_file.hpp
+++ b/support/include/utils/file_thread_file.hpp
@@ -23,6 +23,7 @@
 #define REPERTORY_INCLUDE_UTILS_FILE_THREAD_FILE_HPP_
 
 #include "utils/file.hpp"
+#include <memory>
 
 namespace repertory::utils::file {
 class thread_file final : public i_file {
@@ -67,11 +68,44 @@ public:
   thread_file(thread_file &&move_file) noexcept
       : file_(std::move(move_file.file_)) {}
 
-  ~thread_file() override { close(); }
+  ~thread_file() override;
+
+private:
+  using action_t = std::function<bool()>;
+
+  struct io_item final {
+    action_t action;
+    bool complete{false};
+    std::unique_ptr<std::mutex> mtx{
+        std::make_unique<std::mutex>(),
+    };
+    mutable std::unique_ptr<std::condition_variable> notify{
+        std::make_unique<std::condition_variable>(),
+    };
+    bool success{false};
+
+    void done(bool result);
+
+    void wait() const;
+  };
 
 private:
   fs_file_t file_;
 
+private:
+  mutable std::vector<io_item *> actions_;
+  mutable std::unique_ptr<std::thread> io_thread_;
+  mutable std::unique_ptr<std::mutex> mtx_{std::make_unique<std::mutex>()};
+  mutable std::unique_ptr<std::condition_variable> notify_{
+      std::make_unique<std::condition_variable>(),
+  };
+  stop_type stop_requested_{false};
+
+private:
+  auto do_io(action_t action) const -> bool;
+
+  void thread_func() const;
+
 public:
   void close() override;
 
diff --git a/support/src/utils/file_smb_directory.cpp b/support/src/utils/file_smb_directory.cpp
index bef0d576..190366f5 100644
--- a/support/src/utils/file_smb_directory.cpp
+++ b/support/src/utils/file_smb_directory.cpp
@@ -127,7 +127,7 @@ auto smb_directory::open(std::wstring_view host, std::wstring_view user,
 }
 
 auto smb_directory::copy_to(std::string_view new_path,
-                            bool overwrite) const -> bool {
+                            bool /* overwrite */) const -> bool {
   REPERTORY_USES_FUNCTION_NAME();
 
   try {
diff --git a/support/src/utils/file_thread_file.cpp b/support/src/utils/file_thread_file.cpp
index 4ffc6aff..20576091 100644
--- a/support/src/utils/file_thread_file.cpp
+++ b/support/src/utils/file_thread_file.cpp
@@ -25,41 +25,174 @@ namespace repertory::utils::file {
 // auto thread_file::attach_file(native_handle handle,
 //                               bool read_only) -> fs_file_t {}
 
-thread_file::thread_file(std::string_view path)
-    : file_(new repertory::utils::file::file(path)) {}
-
-thread_file::thread_file(std::wstring_view path)
-    : file_(new repertory::utils::file::file(utils::string::to_utf8(path))) {}
-
-auto thread_file::attach_file(fs_file_t file) -> fs_file_t {}
+auto thread_file::attach_file(fs_file_t file) -> fs_file_t {
+  return fs_file_t{
+      new thread_file(std::move(file)),
+  };
+}
 
 auto thread_file::open_file(std::string_view path,
-                            bool read_only) -> fs_file_t {}
+                            bool read_only) -> fs_file_t {
+  return fs_file_t{
+      new thread_file(file::open_file(path, read_only)),
+  };
+}
 
 auto thread_file::open_or_create_file(std::string_view path,
-                                      bool read_only) -> fs_file_t {}
+                                      bool read_only) -> fs_file_t {
+  return fs_file_t{
+      new thread_file(file::open_or_create_file(path, read_only)),
+  };
+}
+
+void thread_file::io_item::done(bool result) {
+  unique_mutex_lock lock(*mtx);
+  complete = true;
+  success = result;
+  notify->notify_all();
+}
+
+void thread_file::io_item::wait() const {
+  if (complete) {
+    return;
+  }
+
+  unique_mutex_lock lock(*mtx);
+  while (not complete) {
+    notify->wait(lock);
+  }
+  notify->notify_all();
+}
+
+thread_file::thread_file(std::string_view path) : file_(new file(path)) {}
+
+thread_file::thread_file(std::wstring_view path)
+    : file_(new file(utils::string::to_utf8(path))) {}
 
 thread_file::thread_file(fs_file_t file) : file_(std::move(file)) {}
 
-void thread_file::close() {}
+thread_file::~thread_file() {
+  close();
+
+  if (io_thread_) {
+    io_thread_->join();
+  }
+}
+
+void thread_file::close() {
+  do_io([this]() -> bool {
+    file_->close();
+    stop_requested_ = true;
+    return true;
+  });
+}
 
 auto thread_file::copy_to(std::string_view new_path,
-                          bool overwrite) const -> bool {}
+                          bool overwrite) const -> bool {
+  return do_io([this, &new_path, &overwrite]() -> bool {
+    return file_->copy_to(new_path, overwrite);
+  });
+}
 
-void thread_file::flush() const {}
+auto thread_file::do_io(action_t action) const -> bool {
+  unique_mutex_lock lock(*mtx_);
+  if (stop_requested_) {
+    return false;
+  }
 
-auto thread_file::move_to(std::string_view path) -> bool {}
+  if (not io_thread_) {
+    io_thread_ = std::make_unique<std::thread>([this]() { thread_func(); });
+  }
+
+  io_item item{action};
+  actions_.emplace_back(&item);
+  notify_->notify_all();
+  lock.unlock();
+
+  item.wait();
+
+  return item.success;
+}
+
+void thread_file::flush() const {
+  do_io([this]() -> bool {
+    file_->flush();
+    return true;
+  });
+}
+
+auto thread_file::move_to(std::string_view path) -> bool {
+  return do_io([this, &path]() -> bool { return file_->move_to(path); });
+}
 
 auto thread_file::read(unsigned char *data, std::size_t to_read,
-                       std::uint64_t offset, std::size_t *total_read) -> bool {}
+                       std::uint64_t offset, std::size_t *total_read) -> bool {
+  return do_io([this, &data, &to_read, &offset, &total_read]() -> bool {
+    return file_->read(data, to_read, offset, total_read);
+  });
+}
 
-auto thread_file::remove() -> bool {}
+auto thread_file::remove() -> bool {
+  return do_io([this]() -> bool { return file_->remove(); });
+}
 
-auto thread_file::truncate(std::size_t size) -> bool {}
+void thread_file::thread_func() const {
+  unique_mutex_lock lock(*mtx_);
+  notify_->notify_all();
+  lock.unlock();
+
+  const auto run_actions = [this, &lock]() {
+    auto actions = actions_;
+    actions_.clear();
+    notify_->notify_all();
+    lock.unlock();
+
+    for (auto &&action : actions) {
+      action->done(action->action());
+    }
+  };
+
+  while (not stop_requested_) {
+    lock.lock();
+    if (stop_requested_) {
+      lock.unlock();
+      break;
+    }
+
+    while (not stop_requested_ && actions_.empty()) {
+      notify_->wait(lock);
+    }
+
+    if (stop_requested_) {
+      lock.unlock();
+      break;
+    }
+
+    run_actions();
+  }
+
+  lock.lock();
+  run_actions();
+}
+
+auto thread_file::truncate(std::size_t size) -> bool {
+  return do_io([this, &size]() -> bool { return file_->truncate(size); });
+}
 
 auto thread_file::write(const unsigned char *data, std::size_t to_write,
                         std::size_t offset,
-                        std::size_t *total_written) -> bool {}
+                        std::size_t *total_written) -> bool {
+  return do_io([this, &data, &to_write, &offset, &total_written]() -> bool {
+    return file_->write(data, to_write, offset, total_written);
+  });
+}
 
-auto thread_file::size() const -> std::optional<std::uint64_t> {}
+auto thread_file::size() const -> std::optional<std::uint64_t> {
+  std::optional<std::uint64_t> size;
+  do_io([this, &size]() -> bool {
+    size = file_->size();
+    return size.has_value();
+  });
+  return size;
+}
 } // namespace repertory::utils::file
diff --git a/support/test/src/test.cpp b/support/test/src/test.cpp
index e094247a..f9d78280 100644
--- a/support/test/src/test.cpp
+++ b/support/test/src/test.cpp
@@ -57,8 +57,10 @@ auto create_random_file(std::size_t size) -> utils::file::i_file & {
 #if defined(PROJECT_ENABLE_LIBSODIUM)
     randombytes_buf(buf.data(), buf.size());
 #else  // !defined(PROJECT_ENABLE_LIBSODIUM)
-    thread_local std::mt19937 gen(static_cast<unsigned long>(
-        std::time(nullptr) ^ std::random_device{}()));
+    thread_local std::mt19937 gen{
+        static_cast<std::uint_fast32_t>(std::time(nullptr)) ^
+            static_cast<std::uint_fast32_t>(std::random_device{}()),
+    };
     std::uniform_int_distribution<std::uint8_t> dis(0U, 255U);
     std::generate(buf.begin(), buf.end(), [&]() -> auto { return dis(gen); });
 #endif // defined(PROJECT_ENABLE_LIBSODIUM)
diff --git a/support/test/src/utils/file_test.cpp b/support/test/src/utils/file_test.cpp
index 04788070..6997407f 100644
--- a/support/test/src/utils/file_test.cpp
+++ b/support/test/src/utils/file_test.cpp
@@ -22,7 +22,7 @@
 #include "test.hpp"
 
 namespace {
-static constexpr const auto file_type_count{1U};
+static constexpr const auto file_type_count{2U};
 }
 
 namespace repertory {