Add beast_basics module

modules/beast_basics/threads/beast_ThreadGroup.cpp

@@ -0,0 +1,118 @@
+/*============================================================================*/
+/*
+  VFLib: https://github.com/vinniefalco/VFLib
+
+  Copyright (C) 2008 by Vinnie Falco <vinnie.falco@gmail.com>
+
+  This library contains portions of other open source products covered by
+  separate licenses. Please see the corresponding source files for specific
+  terms.
+
+  VFLib is provided under the terms of The MIT License (MIT):
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in
+  all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+  IN THE SOFTWARE.
+*/
+/*============================================================================*/
+
+void ThreadGroup::QuitType::operator () (Worker* worker)
+{
+    worker->setShouldExit ();
+}
+
+//==============================================================================
+
+ThreadGroup::Worker::Worker (String name, ThreadGroup& group)
+    : Thread (name)
+    , m_group (group)
+    , m_shouldExit (false)
+{
+    startThread ();
+}
+
+ThreadGroup::Worker::~Worker ()
+{
+    // Make sure the thread is stopped.
+    stopThread (-1);
+}
+
+void ThreadGroup::Worker::setShouldExit ()
+{
+    m_shouldExit = true;
+}
+
+void ThreadGroup::Worker::run ()
+{
+    do
+    {
+        m_group.m_semaphore.wait ();
+
+        Work* work = m_group.m_queue.pop_front ();
+
+        bassert (work != nullptr);
+
+        work->operator () (this);
+
+        delete work;
+    }
+    while (!m_shouldExit);
+}
+
+//==============================================================================
+
+ThreadGroup::ThreadGroup (int numberOfThreads)
+    : m_numberOfThreads (numberOfThreads)
+    , m_semaphore (0)
+{
+    for (int i = 0; i++ < numberOfThreads; )
+    {
+        String s;
+        s << "ThreadGroup (" << i << ")";
+
+        m_threads.push_front (new Worker (s, *this));
+    }
+}
+
+ThreadGroup::~ThreadGroup ()
+{
+    // Put one quit item in the queue for each worker to stop.
+    for (int i = 0; i < m_numberOfThreads; ++i)
+    {
+        m_queue.push_front (new (getAllocator ()) QuitType);
+
+        m_semaphore.signal ();
+    }
+
+    for (;;)
+    {
+        Worker* worker = m_threads.pop_front ();
+
+        if (worker != nullptr)
+            delete worker;
+        else
+            break;
+    }
+
+    // There must not be pending work!
+    bassert (m_queue.pop_front () == nullptr);
+}
+
+int ThreadGroup::getNumberOfThreads () const
+{
+    return m_numberOfThreads;
+}