1 files changed, 171 insertions, 0 deletions
diff --git a/nci/jni/SyncEvent.h b/nci/jni/SyncEvent.h
new file mode 100644
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+++ b/nci/jni/SyncEvent.h
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+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ *  Synchronize two or more threads using a condition variable and a mutex.
+ */
+#pragma once
+#include "CondVar.h"
+#include "Mutex.h"
+
+
+class SyncEvent
+{
+public:
+    /*******************************************************************************
+    **
+    ** Function:        ~SyncEvent
+    **
+    ** Description:     Cleanup all resources.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    ~SyncEvent ()
+    {
+    }
+
+
+    /*******************************************************************************
+    **
+    ** Function:        start
+    **
+    ** Description:     Start a synchronization operation.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    void start ()
+    {
+        mMutex.lock ();
+    }
+
+
+    /*******************************************************************************
+    **
+    ** Function:        wait
+    **
+    ** Description:     Block the thread and wait for the event to occur.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    void wait ()
+    {
+        mCondVar.wait (mMutex);
+    }
+
+
+    /*******************************************************************************
+    **
+    ** Function:        wait
+    **
+    ** Description:     Block the thread and wait for the event to occur.
+    **                  millisec: Timeout in milliseconds.
+    **
+    ** Returns:         True if wait is successful; false if timeout occurs.
+    **
+    *******************************************************************************/
+    bool wait (long millisec)
+    {
+        bool retVal = mCondVar.wait (mMutex, millisec);
+        return retVal;
+    }
+
+
+    /*******************************************************************************
+    **
+    ** Function:        notifyOne
+    **
+    ** Description:     Notify a blocked thread that the event has occured. Unblocks it.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    void notifyOne ()
+    {
+        mCondVar.notifyOne ();
+    }
+
+
+    /*******************************************************************************
+    **
+    ** Function:        end
+    **
+    ** Description:     End a synchronization operation.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    void end ()
+    {
+        mMutex.unlock ();
+    }
+
+private:
+    CondVar mCondVar;
+    Mutex mMutex;
+};
+
+
+/*****************************************************************************/
+/*****************************************************************************/
+
+
+/*****************************************************************************
+**
+**  Name:           SyncEventGuard
+**
+**  Description:    Automatically start and end a synchronization event.
+**
+*****************************************************************************/
+class SyncEventGuard
+{
+public:
+    /*******************************************************************************
+    **
+    ** Function:        SyncEventGuard
+    **
+    ** Description:     Start a synchronization operation.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    SyncEventGuard (SyncEvent& event)
+    :   mEvent (event)
+    {
+        event.start (); //automatically start operation
+    };
+
+
+    /*******************************************************************************
+    **
+    ** Function:        ~SyncEventGuard
+    **
+    ** Description:     End a synchronization operation.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    ~SyncEventGuard ()
+    {
+        mEvent.end (); //automatically end operation
+    };
+
+private:
+    SyncEvent& mEvent;
+};
+