initial code repo

[stor4nfv.git] / src / ceph / src / msg / QueueStrategy.cc

diff --git a/src/ceph/src/msg/QueueStrategy.cc b/src/ceph/src/msg/QueueStrategy.cc
new file mode 100644 (file)
index 0000000..e41ab79
--- /dev/null
+++ b/src/ceph/src/msg/QueueStrategy.cc
@@ -0,0 +1,115 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2014 CohortFS, LLC
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+#include <string>
+#include "QueueStrategy.h"
+#define dout_subsys ceph_subsys_ms
+#include "common/debug.h"
+#include "common/backport14.h"
+
+QueueStrategy::QueueStrategy(int _n_threads)
+  : lock("QueueStrategy::lock"),
+    n_threads(_n_threads),
+    stop(false),
+    mqueue(),
+    disp_threads()
+{
+}
+
+void QueueStrategy::ds_dispatch(Message *m) {
+  msgr->ms_fast_preprocess(m);
+  if (msgr->ms_can_fast_dispatch(m)) {
+    msgr->ms_fast_dispatch(m);
+    return;
+  }
+  lock.Lock();
+  mqueue.push_back(*m);
+  if (disp_threads.size()) {
+    if (! disp_threads.empty()) {
+      QSThread *thrd = &disp_threads.front();
+      disp_threads.pop_front();
+      thrd->cond.Signal();
+    }
+  }
+  lock.Unlock();
+}
+
+void QueueStrategy::entry(QSThread *thrd)
+{
+  Message *m = NULL;
+  for (;;) {
+    lock.Lock();
+    for (;;) {
+      if (! mqueue.empty()) {
+       m = &(mqueue.front());
+       mqueue.pop_front();
+       break;
+      }
+      m = NULL;
+      if (stop)
+       break;
+      disp_threads.push_front(*thrd);
+      thrd->cond.Wait(lock);
+    }
+    lock.Unlock();
+    if (stop) {
+       if (!m) break;
+       m->put();
+       continue;
+    }
+    get_messenger()->ms_deliver_dispatch(m);
+  }
+}
+
+void QueueStrategy::shutdown()
+{
+  QSThread *thrd;
+  lock.Lock();
+  stop = true;
+  while (disp_threads.size()) {
+    thrd = &(disp_threads.front());
+    disp_threads.pop_front();
+    thrd->cond.Signal();
+  }
+  lock.Unlock();
+}
+
+void QueueStrategy::wait()
+{
+  lock.Lock();
+  assert(stop);
+  for (auto& thread : threads) {
+    lock.Unlock();
+
+    // join outside of lock
+    thread->join();
+
+    lock.Lock();
+  }
+  lock.Unlock();
+}
+
+void QueueStrategy::start()
+{
+  assert(!stop);
+  lock.Lock();
+  threads.reserve(n_threads);
+  for (int ix = 0; ix < n_threads; ++ix) {
+    string thread_name = "ms_xio_qs_";
+    thread_name.append(std::to_string(ix));
+    auto thrd = ceph::make_unique<QSThread>(this);
+    thrd->create(thread_name.c_str());
+    threads.emplace_back(std::move(thrd));
+  }
+  lock.Unlock();
+}