From 5e59a8e38c9f8992e6ffd9dbbde11e1f873780e1 Mon Sep 17 00:00:00 2001
From: Yuqian Yang <crupest@crupest.life>
Date: Wed, 3 Sep 2025 12:30:46 +0800
Subject: Add unix timer file. Not tested.

---
 include/cru/base/platform/unix/Timer.h | 42 ++++++++++++++++++++++++++++++++++
 src/base/CMakeLists.txt                |  1 +
 src/base/platform/unix/Timer.cpp       |  5 ++++
 3 files changed, 48 insertions(+)
 create mode 100644 include/cru/base/platform/unix/Timer.h
 create mode 100644 src/base/platform/unix/Timer.cpp

diff --git a/include/cru/base/platform/unix/Timer.h b/include/cru/base/platform/unix/Timer.h
new file mode 100644
index 00000000..e2cbff7d
--- /dev/null
+++ b/include/cru/base/platform/unix/Timer.h
@@ -0,0 +1,42 @@
+#pragma once
+
+#if !defined(__unix) && !defined(__APPLE__)
+#error "This file can only be included on unix."
+#endif
+
+#include "../../Base.h"
+#include "../../Exception.h"
+#include "UnixFile.h"
+
+#include <chrono>
+#include <thread>
+
+namespace cru::platform::unix {
+class UnixTimerFile : public Object2 {
+ public:
+  template <class Rep, class Period>
+  explicit UnixTimerFile(std::chrono::duration<Rep, Period> time) {
+    auto fds = OpenUniDirectionalPipe();
+    this->read_fd_ = std::move(fds.read);
+    this->write_fd_ = std::move(fds.write);
+
+    this->thread_ = std::thread([this, &time] {
+      std::this_thread::sleep_for(time);
+      constexpr auto buffer = "";
+      auto written = ::write(this->write_fd_, buffer, 1);
+      if (written != 1) {
+        throw Exception(
+            "Failed to write to pipe in UnixTimerFile thread at timeout.");
+      }
+    });
+    this->thread_.detach();
+  }
+
+  int GetReadFd() const;
+
+ private:
+  UnixFileDescriptor write_fd_;
+  UnixFileDescriptor read_fd_;
+  std::thread thread_;
+};
+}  // namespace cru::platform::unix
diff --git a/src/base/CMakeLists.txt b/src/base/CMakeLists.txt
index e0a16768..300898af 100644
--- a/src/base/CMakeLists.txt
+++ b/src/base/CMakeLists.txt
@@ -25,6 +25,7 @@ target_compile_definitions(CruBase PUBLIC $<$<CONFIG:Debug>:CRU_DEBUG>)
 if (UNIX AND NOT EMSCRIPTEN)
 	target_sources(CruBase PRIVATE
 		platform/unix/PosixSpawnSubProcess.cpp
+		platform/unix/Timer.cpp
 		platform/unix/UnixFile.cpp
 		platform/unix/UnixFileStream.cpp
 	)
diff --git a/src/base/platform/unix/Timer.cpp b/src/base/platform/unix/Timer.cpp
new file mode 100644
index 00000000..25264dc8
--- /dev/null
+++ b/src/base/platform/unix/Timer.cpp
@@ -0,0 +1,5 @@
+#include "cru/base/platform/unix/Timer.h"
+
+namespace cru::platform::unix {
+int UnixTimerFile::GetReadFd() const { return this->read_fd_; }
+}  // namespace cru::platform::unix
-- 
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