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/* |
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* LSCP Shell |
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* |
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* Copyright (c) 2014 - 2020 Christian Schoenebeck |
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* |
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* This program is part of LinuxSampler and released under the same terms. |
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*/ |
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#include "KeyboardReader.h" |
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static KeyboardReader* g_singleton = NULL; |
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static int g_instanceCount = 0; |
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KeyboardReader::KeyboardReader() : Thread(false, false, 1, -1), |
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m_originalTerminalSetting(TerminalCtrl::now()), |
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m_callback(NULL), m_doCallback(true) |
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{ |
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if (!g_instanceCount) g_singleton = this; |
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g_instanceCount++; |
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TerminalCtrl::echoInput(false); |
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} |
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KeyboardReader::~KeyboardReader() { |
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StopThread(); |
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TerminalCtrl::restore(m_originalTerminalSetting); |
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// ensures that no temporary copy objects delete the global reference |
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g_instanceCount--; |
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if (!g_instanceCount) g_singleton = NULL; |
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} |
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void KeyboardReader::setCallback(Callback_t fn) { |
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m_callback = fn; |
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} |
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void KeyboardReader::callback(bool b) { |
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m_doCallback = b; |
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} |
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int KeyboardReader::Main() { |
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#if DEBUG |
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Thread::setNameOfCaller("KeyboardReader"); |
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#endif |
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while (true) { |
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std::vector<char> v = TerminalCtrl::getChars(1, 1); |
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if (!v.empty()) { |
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// prevent thread from being cancelled |
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// (e.g. to prevent deadlocks while holding mutex lock(s)) |
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pushCancelable(false); |
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m_fifoMutex.Lock(); |
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m_fifo.push_back(v[0]); |
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if (m_sync.GetUnsafe()) { |
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bool delimiterReceived = false; |
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for (std::list<char>::iterator it = m_fifo.begin(); it != m_fifo.end(); ++it) { |
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if ((*it) == m_syncDelimiter) { |
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delimiterReceived = true; |
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break; |
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} |
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} |
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m_fifoMutex.Unlock(); |
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if (delimiterReceived) m_sync.Set(false); |
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} else { |
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m_fifoMutex.Unlock(); |
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if (m_callback && m_doCallback) (*m_callback)(this); |
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} |
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// now allow thread being cancelled again |
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// (since all mutexes are now unlocked) |
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popCancelable(); |
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} |
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TestCancel(); |
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} |
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return 0; // just to avoid a warning with some old compilers |
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} |
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bool KeyboardReader::charAvailable() const { |
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return !m_fifo.empty(); // is thread safe |
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} |
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char KeyboardReader::popChar() { |
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LockGuard lock(m_fifoMutex); |
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if (m_fifo.empty()) return 0; |
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char c = m_fifo.front(); |
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m_fifo.pop_front(); |
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return c; |
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} |
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std::string KeyboardReader::popStringToDelimiterSync(char delimiter, bool includeDelimiter) { |
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m_syncDelimiter = delimiter; |
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bool alreadyReceived = false; |
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m_fifoMutex.Lock(); |
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for (std::list<char>::iterator it = m_fifo.begin(); it != m_fifo.end(); ++it) { |
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if ((*it)== delimiter) { |
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alreadyReceived = true; |
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break; |
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} |
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} |
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if (!alreadyReceived) m_sync.Set(true); |
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m_fifoMutex.Unlock(); |
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if (!alreadyReceived) m_sync.WaitAndUnlockIf(true); |
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// if we are here, then there is now a string with the requested delimiter |
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// in the FIFO |
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std::string s; |
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while (charAvailable()) { |
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char c = popChar(); |
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if (includeDelimiter || c != delimiter) s += c; |
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if (c == delimiter) return s; |
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} |
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return s; |
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} |
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void KeyboardReader::startReading() { |
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StartThread(); |
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} |
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void KeyboardReader::stopReading() { |
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StopThread(); |
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} |
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KeyboardReader* KeyboardReader::singleton() { |
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return g_singleton; |
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} |