the begginning

utils/threadpool/threadpool.cpp

@@ -0,0 +1,320 @@
+/* Copyright (C) 2014 InfiniDB, Inc.
+
+   This program 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; version 2 of
+   the License.
+
+   This program 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 this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA. */
+
+/***********************************************************************
+*   $Id: threadpool.cpp 3495 2013-01-21 14:09:51Z rdempsey $
+*
+*
+***********************************************************************/
+
+#include <stdexcept>
+using namespace std;
+
+#include "messageobj.h"
+#include "messagelog.h"
+using namespace logging;
+
+#define THREADPOOL_DLLEXPORT
+#include "threadpool.h"
+#undef THREADPOOL_DLLEXPORT
+
+namespace threadpool
+{
+
+ThreadPool::ThreadPool()
+        :fMaxThreads( 0 ), fQueueSize( 0 )
+{
+    init();
+}
+
+ThreadPool::ThreadPool( size_t maxThreads, size_t queueSize )
+        :fMaxThreads( maxThreads ), fQueueSize( queueSize )
+{
+    init();
+
+    if (fQueueSize == 0)
+        fQueueSize = fMaxThreads*2;
+}
+
+
+
+ThreadPool::~ThreadPool() throw()
+{
+// 	delete fThreadCreated;
+    try
+    {
+        stop();
+    }
+    catch(...)
+    {}
+}
+
+void ThreadPool::init()
+{
+    fThreadCount = 0;
+    fGeneralErrors = 0;
+    fFunctorErrors = 0;
+	waitingFunctorsSize = 0;
+	issued = 0;
+    fStop = false;
+//     fThreadCreated = new NoOp();
+    fNextFunctor = fWaitingFunctors.end();
+}
+
+void ThreadPool::setQueueSize(size_t queueSize)
+{
+    boost::mutex::scoped_lock lock1(fMutex);
+    fQueueSize = queueSize;
+}
+
+
+void ThreadPool::setMaxThreads(size_t maxThreads)
+{
+    boost::mutex::scoped_lock lock1(fMutex);
+    fMaxThreads = maxThreads;
+}
+
+void ThreadPool::setThreadCreatedListener(const Functor_T &f)
+{
+//     fThreadCreated = f;
+}
+
+void ThreadPool::stop()
+{
+    boost::mutex::scoped_lock lock1(fMutex);
+    fStop = true;
+    lock1.unlock();
+
+    fNeedThread.notify_all();
+    fThreads.join_all();
+}
+
+
+void ThreadPool::wait()
+{
+    boost::mutex::scoped_lock lock1(fMutex);
+
+    while (waitingFunctorsSize > 0)
+    {
+        fThreadAvailable.wait(lock1);
+		//cerr << "woke!" << endl;
+    }
+}
+
+void ThreadPool::invoke(const Functor_T &threadfunc)
+{
+    boost::mutex::scoped_lock lock1(fMutex);
+
+    for(;;)
+    {
+
+        try
+        {
+            if ( waitingFunctorsSize < fThreadCount)
+            {
+                // Don't create a thread unless it's needed.  There
+                // is a thread available to service this request.
+                addFunctor(threadfunc);
+                lock1.unlock();
+                break;
+            }
+
+            bool bAdded = false;
+
+            if ( waitingFunctorsSize < fQueueSize)
+            {
+                // Don't create a thread unless you have to
+                addFunctor(threadfunc);
+                bAdded = true;
+            }
+
+            if ( fThreadCount < fMaxThreads)
+            {
+                ++fThreadCount;
+
+                lock1.unlock();
+                fThreads.create_thread(beginThreadFunc(*this));
+
+                if (bAdded)
+                    break;
+
+                // If the mutex is unlocked before creating the thread
+                // this allows fThreadAvailable to be triggered
+                // before the wait below runs.  So run the loop again.
+                lock1.lock();
+                continue;
+            }
+
+            if (bAdded)
+            {
+                lock1.unlock();
+                break;
+            }
+
+            fThreadAvailable.wait(lock1);
+        }
+        catch(...)
+        {
+            ++fGeneralErrors;
+            throw;
+        }
+    }
+
+    fNeedThread.notify_one();
+}
+
+void ThreadPool::beginThread() throw()
+{
+    try
+    {
+//         fThreadCreated();
+
+        boost::mutex::scoped_lock lock1(fMutex);
+
+        for(;;)
+        {
+            if (fStop)
+                break;
+
+            if (fNextFunctor == fWaitingFunctors.end())
+            {
+                // Wait until someone needs a thread
+                fNeedThread.wait(lock1);
+            }
+            else
+            {
+				/* Need to tune these magic #s */
+
+				vector<Container_T::iterator> todoList;
+				int i, num;
+				Container_T::const_iterator iter;
+
+				/* Use this to control how many jobs are issued to a single thread */
+                num = (waitingFunctorsSize - issued >= 1 ? 1 : 0);
+
+				for (i = 0; i < num; i++)
+                	todoList.push_back(fNextFunctor++);
+
+				issued += num;
+// 				cerr << "got " << num << " jobs." << endl;
+//   				cerr << "got " << num << " jobs. waitingFunctorsSize=" <<
+//   					waitingFunctorsSize << " issued=" << issued << " fThreadCount=" <<
+//   					fThreadCount << endl;
+                lock1.unlock();
+
+				for (i = 0; i < num; i++) {
+					try {
+	                    (*todoList[i])();
+					}
+					catch(exception &e) {
+						++fFunctorErrors;
+						cerr << e.what() << endl;
+					}
+				}
+				lock1.lock();
+
+				issued -= num;
+				waitingFunctorsSize -= num;
+				for (i = 0; i < num; i++)
+					fWaitingFunctors.erase(todoList[i]);
+/*
+				if (waitingFunctorsSize != fWaitingFunctors.size())
+					cerr << "size mismatch!  fake size=" << waitingFunctorsSize <<
+						" real size=" << fWaitingFunctors.size() << endl;
+*/
+                fThreadAvailable.notify_all();
+
+            }
+        }
+    }
+    catch (exception& ex)
+    {
+
+        ++fGeneralErrors;
+
+        // Log the exception and exit this thread
+        try
+        {
+            logging::Message::Args args;
+            logging::Message message(5);
+            args.add("beginThread: Caught exception: ");
+            args.add(ex.what());
+
+            message.format( args );
+
+            logging::LoggingID lid(22);
+            logging::MessageLog ml(lid);
+
+            ml.logErrorMessage( message );
+
+        }
+        catch(...)
+        {
+        }
+
+    }
+    catch(...)
+    {
+
+        ++fGeneralErrors;
+
+        // Log the exception and exit this thread
+        try
+        {
+            logging::Message::Args args;
+            logging::Message message(6);
+            args.add("beginThread: Caught unknown exception!");
+
+            message.format( args );
+
+            logging::LoggingID lid(22);
+            logging::MessageLog ml(lid);
+
+            ml.logErrorMessage( message );
+
+        }
+        catch(...)
+        {
+        }
+
+    }
+
+}
+
+void ThreadPool::addFunctor(const Functor_T &func)
+{
+    bool bAtEnd = false;
+
+    if (fNextFunctor == fWaitingFunctors.end())
+        bAtEnd = true;
+
+    fWaitingFunctors.push_back(func);
+	waitingFunctorsSize++;
+    if (bAtEnd)
+    {
+        --fNextFunctor;
+    }
+}
+
+void ThreadPool::dump()
+{
+    std::cout << "General Errors: " << fGeneralErrors << std::endl;
+    std::cout << "Functor Errors: " << fFunctorErrors << std::endl;
+    std::cout << "Waiting functors: " << fWaitingFunctors.size() << std::endl;
+}
+
+} // namespace threadpool