xref: /third_party/nghttp2/src/shrpx_io_control.h (revision 2c593315)

/*
 * 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