Coverage Report

Created: 2022-07-16 07:03

/Users/buildslave/jenkins/workspace/coverage/llvm-project/lldb/include/lldb/Utility/SelectHelper.h
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//===-- SelectHelper.h ------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLDB_UTILITY_SELECTHELPER_H
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#define LLDB_UTILITY_SELECTHELPER_H
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#include "lldb/Utility/Status.h"
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#include "lldb/lldb-types.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/Optional.h"
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#include <chrono>
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class SelectHelper {
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public:
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  // Defaults to infinite wait for select unless you call SetTimeout()
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  SelectHelper();
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  // Call SetTimeout() before calling SelectHelper::Select() to set the timeout
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  // based on the current time + the timeout. This allows multiple calls to
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  // SelectHelper::Select() without having to worry about the absolute timeout
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  // as this class manages to set the relative timeout correctly.
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  void SetTimeout(const std::chrono::microseconds &timeout);
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  // Call the FDSet*() functions before calling SelectHelper::Select() to set
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  // the file descriptors that we will watch for when calling select. This will
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  // cause FD_SET() to be called prior to calling select using the "fd"
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  // provided.
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  void FDSetRead(lldb::socket_t fd);
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  void FDSetWrite(lldb::socket_t fd);
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  void FDSetError(lldb::socket_t fd);
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  // Call the FDIsSet*() functions after calling SelectHelper::Select() to
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  // check which file descriptors are ready for read/write/error. This will
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  // contain the result of FD_ISSET after calling select for a given file
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  // descriptor.
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  bool FDIsSetRead(lldb::socket_t fd) const;
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  bool FDIsSetWrite(lldb::socket_t fd) const;
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  bool FDIsSetError(lldb::socket_t fd) const;
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  // Call the system's select() to wait for descriptors using timeout provided
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  // in a call the SelectHelper::SetTimeout(), or infinite wait if no timeout
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  // was set.
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  lldb_private::Status Select();
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protected:
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  struct FDInfo {
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    FDInfo()
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        : read_set(false), write_set(false), error_set(false),
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1.75M
          read_is_set(false), write_is_set(false), error_is_set(false) {}
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1.75M
    void PrepareForSelect() {
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1.75M
      read_is_set = false;
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1.75M
      write_is_set = false;
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      error_is_set = false;
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1.75M
    }
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    bool read_set : 1, write_set : 1, error_set : 1, read_is_set : 1,
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        write_is_set : 1, error_is_set : 1;
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  };
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  llvm::DenseMap<lldb::socket_t, FDInfo> m_fd_map;
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  llvm::Optional<std::chrono::steady_clock::time_point> m_end_time;
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};
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#endif // LLDB_UTILITY_SELECTHELPER_H