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Diffstat (limited to 'tesseract/src/viewer/svutil.h')
-rw-r--r-- | tesseract/src/viewer/svutil.h | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/tesseract/src/viewer/svutil.h b/tesseract/src/viewer/svutil.h new file mode 100644 index 00000000..e91f11f4 --- /dev/null +++ b/tesseract/src/viewer/svutil.h @@ -0,0 +1,106 @@ +/////////////////////////////////////////////////////////////////////// +// 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_ |