Move thread-pool down into comphelper for re-use elsewhere.

Change-Id: Ib27b8b1ccc07ff194035d6c2ef3d45c429e3cea1

1 files changed, 64 insertions, 0 deletions

diff --git a/include/comphelper/threadpool.hxx b/include/comphelper/threadpool.hxx
new file mode 100644
index 000000000000..ae103f1164f1
--- /dev/null
+++ b/include/comphelper/threadpool.hxx
@@ -0,0 +1,64 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_COMPHELPER_THREADPOOL_HXX
+#define INCLUDED_COMPHELPER_THREADPOOL_HXX
+
+#include <sal/config.h>
+#include <salhelper/thread.hxx>
+#include <osl/mutex.hxx>
+#include <osl/conditn.hxx>
+#include <rtl/ref.hxx>
+#include <vector>
+#include <comphelper/comphelperdllapi.h>
+
+namespace comphelper
+{
+
+class COMPHELPER_DLLPUBLIC ThreadTask
+{
+public:
+    virtual      ~ThreadTask() {}
+    virtual void doWork() = 0;
+};
+
+/// A very basic thread pool implementation
+class COMPHELPER_DLLPUBLIC ThreadPool
+{
+public:
+    /// returns a pointer to a shared pool with optimal thread
+    /// count for the CPU
+    static      ThreadPool& getSharedOptimalPool();
+
+                ThreadPool( sal_Int32 nWorkers );
+    virtual    ~ThreadPool();
+
+    void        pushTask( ThreadTask *pTask /* takes ownership */ );
+    void        waitUntilEmpty();
+    void        waitUntilWorkersDone();
+
+private:
+    class ThreadWorker;
+    friend class ThreadWorker;
+
+    ThreadTask *waitForWork( osl::Condition &rNewWork );
+    ThreadTask *popWork();
+
+    osl::Mutex maGuard;
+    osl::Condition maTasksEmpty;
+    bool mbTerminate;
+    std::vector< rtl::Reference< ThreadWorker > > maWorkers;
+    std::vector< ThreadTask * >   maTasks;
+};
+
+} // namespace comphelper
+
+#endif // INCLUDED_COMPHELPER_THREADPOOL_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */