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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>
namespace tesseract {
/// The SVSync class provides functionality for Thread & Process Creation
class SVSync {
public:
/// Starts a new process.
static void StartProcess(const char* executable, const char* args);
};
/// A semaphore class which encapsulates the main signaling
/// and wait abilities of semaphores for windows and unix.
class SVSemaphore {
public:
/// Sets up a semaphore.
SVSemaphore();
/// Signal a semaphore.
void Signal();
/// Wait on a semaphore.
void Wait();
private:
#ifdef _WIN32
HANDLE semaphore_;
#elif defined(__APPLE__)
sem_t *semaphore_;
#else
sem_t semaphore_;
#endif
};
/// The SVNetwork class takes care of the remote connection for ScrollView
/// This means setting up and maintaining a remote connection, sending and
/// receiving messages and closing the connection.
/// It is designed to work on both Linux and Windows.
class SVNetwork {
public:
/// Set up a connection to hostname on port.
SVNetwork(const char* hostname, int port);
/// Destructor.
~SVNetwork();
/// Put a message in the messagebuffer to the server and try to send it.
void Send(const char* msg);
/// Receive a message from the server.
/// This will always return one line of char* (denoted by \\n).
char* Receive();
/// Close the connection to the server.
void Close();
/// Flush the buffer.
void Flush();
private:
/// The mutex for access to Send() and Flush().
std::mutex mutex_send_;
/// The actual stream_ to the server.
int stream_;
/// Stores the last received message-chunk from the server.
char* msg_buffer_in_;
/// Stores the messages which are supposed to go out.
std::string msg_buffer_out_;
/// Where we are at in our msg_buffer_in_
char* buffer_ptr_; // strtok_r, strtok_s
};
} // namespace tesseract
#endif // TESSERACT_VIEWER_SVUTIL_H_
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