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diff --git a/src/shrpx_io_control.h b/src/shrpx_io_control.h
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+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2012 Tatsuhiro Tsujikawa
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef SHRPX_IO_CONTROL_H
+#define SHRPX_IO_CONTROL_H
+
+#include "shrpx.h"
+
+#include <cinttypes>
+#include <vector>
+
+#include <ev.h>
+
+#include "shrpx_rate_limit.h"
+
+namespace shrpx {
+
+enum IOCtrlReason { SHRPX_NO_BUFFER = 1 << 0, SHRPX_MSG_BLOCK = 1 << 1 };
+
+class IOControl {
+public:
+  IOControl(RateLimit *lim);
+  ~IOControl();
+  void pause_read(IOCtrlReason reason);
+  // Returns true if read operation is enabled after this call
+  bool resume_read(IOCtrlReason reason);
+  // Clear all pause flags and enable read
+  void force_resume_read();
+
+private:
+  RateLimit *lim_;
+  uint32_t rdbits_;
+};
+
+} // namespace shrpx
+
+#endif // SHRPX_IO_CONTROL_H