svutil.h

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// File:        svutil.h
// Description: ScrollView Utilities
// Author:      Joern Wanke
//
// (C) Copyright 2007, Google Inc.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//
// SVUtil contains the SVSync, SVSemaphore and SVNetwork
// classes, which are used for thread/process creation & synchronization
// and network connection.
 
#ifndef TESSERACT_VIEWER_SVUTIL_H_
#define TESSERACT_VIEWER_SVUTIL_H_
 
#ifdef _WIN32
#  include "host.h"  // also includes windows.h
#else
#include <semaphore.h>
#endif
 
#include <mutex>
#include <string>
 
class SVSync {
 public:
  static void StartProcess(const char* executable, const char* args);
};
 
class SVSemaphore {
 public:
  SVSemaphore();
  void Signal();
  void Wait();
 private:
#ifdef _WIN32
  HANDLE semaphore_;
#elif defined(__APPLE__)
  sem_t *semaphore_;
#else
  sem_t semaphore_;
#endif
};
 
class SVNetwork {
 public:
  SVNetwork(const char* hostname, int port);
 
  ~SVNetwork();
 
  void Send(const char* msg);
 
  char* Receive();
 
  void Close();
 
  void Flush();
 
 private:
  std::mutex mutex_send_;
  int stream_;
  char* msg_buffer_in_;
 
  std::string msg_buffer_out_;
 
  bool has_content;  // Win32 (strtok)
  char* buffer_ptr_;  // Unix (strtok_r)
};
 
#endif  // TESSERACT_VIEWER_SVUTIL_H_