diff src/logger.cpp @ 0:add35537fdbb tip

Initial import

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/logger.cpp	Thu Aug 25 11:05:55 2011 +0100
@@ -0,0 +1,64 @@
+//  Copyright 2011, Ian Hobson.
+//
+//  This file is part of gpsynth.
+//
+//  gpsynth is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  gpsynth is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with gpsynth in the file COPYING. 
+//  If not, see http://www.gnu.org/licenses/.
+
+#include "logger.hpp"
+
+namespace logger {
+
+Logger::Logger()
+: output_stream_(std::cout),
+  quit_thread_(false) {
+  logging_thread_.reset(new boost::thread(&Logger::WorkerThread, this));
+}
+
+Logger::~Logger() {
+  quit_thread_ = true;
+  queue_condition_.notify_one();
+  logging_thread_->join();
+}
+
+void Logger::LogMessage(const std::string& message) {
+  boost::mutex::scoped_lock lock(queue_mutex_);
+  log_queue_.push(message);
+  queue_condition_.notify_one();
+}
+
+void Logger::WorkerThread() {
+  while (!quit_thread_) {
+    boost::mutex::scoped_lock lock(queue_mutex_);
+    while (log_queue_.empty() && !quit_thread_) {
+      queue_condition_.wait(lock);
+    }
+    while (!log_queue_.empty()) {
+      output_stream_ << log_queue_.front();
+      log_queue_.pop();
+    }
+    output_stream_ << std::flush;
+    queue_condition_.notify_one();
+  }
+}
+  
+void Logger::Flush() {
+  // wait for the worker thread to empty the work queue
+  boost::mutex::scoped_lock lock(queue_mutex_);
+  while (!log_queue_.empty()) {
+    queue_condition_.wait(lock);
+  }
+}
+  
+} // logger namespace