1 files changed, 100 insertions, 0 deletions
diff --git a/storage/ndb/src/mgmsrv/SignalQueue.hpp b/storage/ndb/src/mgmsrv/SignalQueue.hpp
new file mode 100644
index 00000000000..bacbad53415
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+++ b/storage/ndb/src/mgmsrv/SignalQueue.hpp
@@ -0,0 +1,100 @@
+/* Copyright (C) 2003 MySQL AB
+
+   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; either version 2 of the License, or
+   (at your option) any later version.
+
+   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#ifndef __SIGNALQUEUE_HPP_INCLUDED__
+#define __SIGNALQUEUE_HPP_INCLUDED__
+
+#include <NdbApiSignal.hpp>
+#include <NdbMutex.h>
+#include <NdbCondition.h>
+#include <Vector.hpp>
+
+/* XXX Look for an already existing definition */
+#define DEFAULT_TIMEOUT 5000
+
+class SignalQueue {
+public:
+  typedef void (* SignalHandler)(void *obj, int gsn, NdbApiSignal *signal);
+
+  SignalQueue();
+  ~SignalQueue();
+
+  /**
+   * Static wrapper making it possible to call receive without knowing the
+   * type of the receiver
+   */
+  static void receive(void *me, NdbApiSignal *signal);
+
+  /**
+   * Enqueues a signal, and notifies any thread waiting for signals.
+   */
+  void receive(NdbApiSignal *signal);
+
+  NdbApiSignal *waitFor(int gsn,
+			NodeId nodeid = 0,
+			Uint32 timeout = DEFAULT_TIMEOUT);
+  template<class T> bool waitFor(Vector<T> &t,
+				 T **handler,
+				 NdbApiSignal **signal,
+				 Uint32 timeout = DEFAULT_TIMEOUT);
+private:
+  NdbMutex *m_mutex; /* Locks all data in SignalQueue */
+  NdbCondition *m_cond; /* Notifies about new signal in the queue */
+
+  /**
+   * Returns the last recently received signal. Must be called with
+   * m_mutex locked.
+   * The caller takes responsibility for deleting the returned object.
+   *
+   * @returns NULL if failed, or a received signal
+   */
+  NdbApiSignal *pop();
+
+  class QueueEntry {
+  public:
+    NdbApiSignal *signal;
+    QueueEntry *next;
+  };
+  QueueEntry *m_signalQueueHead; /** Head of the queue.
+				  *  New entries added on the tail
+				  */
+};
+
+template<class T> bool
+SignalQueue::waitFor(Vector<T> &t,
+		     T **handler,
+		     NdbApiSignal **signal,
+		     Uint32 timeout) {
+  Guard g(m_mutex);
+
+  if(m_signalQueueHead == NULL)
+    NdbCondition_WaitTimeout(m_cond, m_mutex, timeout);
+
+  if(m_signalQueueHead == NULL)
+    return false;
+
+  for(size_t i = 0; i < t.size(); i++) {
+    if(t[i].check(m_signalQueueHead->signal)) {
+      * handler = &t[i];
+      * signal = pop();
+      return true;
+    }
+  }
+
+  return false;
+}
+
+#endif /* !__SIGNALQUEUE_HPP_INCLUDED__ */