Add unix event loop.

3 files changed, 96 insertions, 43 deletions

diff --git a/include/cru/base/Base.h b/include/cru/base/Base.h
index fd409360..f8f8c8c0 100644
--- a/include/cru/base/Base.h
+++ b/include/cru/base/Base.h
@@ -93,6 +93,7 @@ struct CRU_BASE_API Interface {
 };
 
 [[noreturn]] void CRU_BASE_API UnreachableCode();
+[[noreturn]] void CRU_BASE_API NotImplemented();
 
 using Index = std::ptrdiff_t;
 
diff --git a/include/cru/base/platform/unix/EventLoop.h b/include/cru/base/platform/unix/EventLoop.h
new file mode 100644
index 00000000..bc2bcbf8
--- /dev/null
+++ b/include/cru/base/platform/unix/EventLoop.h
@@ -0,0 +1,95 @@
+#pragma once
+
+#include <optional>
+#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 <unistd.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_;
+};
+
+class UnixEventLoop : public Object2 {
+ public:
+  UnixEventLoop();
+
+  int Run();
+  void RequestQuit(int exit_code = 0);
+
+  int SetTimer(std::function<void()> action, std::chrono::milliseconds timeout,
+               bool repeat);
+
+  int SetImmediate(std::function<void()> action) {
+    return this->SetTimer(std::move(action), std::chrono::milliseconds::zero(),
+                          false);
+  }
+
+  int SetTimeout(std::function<void()> action,
+                 std::chrono::milliseconds timeout) {
+    return this->SetTimer(std::move(action), std::move(timeout), false);
+  }
+
+  int SetInterval(std::function<void()> action,
+                  std::chrono::milliseconds interval) {
+    return this->SetTimer(std::move(action), std::move(interval), true);
+  }
+
+ private:
+  struct TimerData {
+    int id;
+    std::chrono::milliseconds original_timeout;
+    std::chrono::milliseconds timeout;
+    bool repeat;
+    std::function<void()> action;
+
+    TimerData(int id, std::chrono::milliseconds timeout, bool repeat,
+              std::function<void()> action)
+        : id(id),
+          original_timeout(timeout),
+          timeout(timeout),
+          repeat(repeat),
+          action(std::move(action)) {}
+  };
+
+  std::thread::id running_thread_;
+
+  std::atomic_int timer_tag_;
+  std::vector<TimerData> timers_;
+
+  std::optional<int> exit_code_;
+};
+
+}  // namespace cru::platform::unix
diff --git a/include/cru/base/platform/unix/Timer.h b/include/cru/base/platform/unix/Timer.h
deleted file mode 100644
index 17abd1cc..00000000
--- a/include/cru/base/platform/unix/Timer.h
+++ /dev/null
@@ -1,43 +0,0 @@
-#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>
-#include <unistd.h>
-
-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