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/* -*- mode: C++; tab-width: 4 -*- */
/* ===================================================================== *\
Copyright (c) 2000-2001 Palm, Inc. or its subsidiaries.
All rights reserved.
This file is part of the Palm OS Emulator.
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.
\* ===================================================================== */
#include "EmCommon.h"
#include "EmThreadSafeQueue.h"
// ---------------------------------------------------------------------------
// EmThreadSafeQueue
// ---------------------------------------------------------------------------
template <class T>
EmThreadSafeQueue<T>::EmThreadSafeQueue (int maxSize) :
fMutex (),
#if HAS_OMNI_THREAD
fAvailable (&fMutex),
#endif
fContainer (),
fMaxSize (maxSize)
{
}
// ---------------------------------------------------------------------------
// EmThreadSafeQueue
// ---------------------------------------------------------------------------
template <class T>
EmThreadSafeQueue<T>::~EmThreadSafeQueue (void)
{
}
// ---------------------------------------------------------------------------
// EmThreadSafeQueue::Put
// ---------------------------------------------------------------------------
template <class T>
void EmThreadSafeQueue<T>::Put (const T& value)
{
omni_mutex_lock lock (fMutex);
EmAssert (fMaxSize == 0 || (long) fContainer.size () < fMaxSize);
fContainer.push_back (value);
#if HAS_OMNI_THREAD
// Tell clients that there may be new data in the buffer.
fAvailable.signal ();
#endif
}
// ---------------------------------------------------------------------------
// EmThreadSafeQueue::Get
// ---------------------------------------------------------------------------
template <class T>
T EmThreadSafeQueue<T>::Get (void)
{
omni_mutex_lock lock (fMutex);
// Make sure there's something in the queue (this shouldn't happen,
// because the caller should always call GetUsed before Get).
EmAssert (fContainer.size () > 0);
T result = fContainer[0];
fContainer.pop_front ();
return result;
}
// ---------------------------------------------------------------------------
// EmThreadSafeQueue::Peek
// ---------------------------------------------------------------------------
template <class T>
T EmThreadSafeQueue<T>::Peek (void)
{
omni_mutex_lock lock (fMutex);
// Make sure there's something in the queue (this shouldn't happen,
// because the caller should always call GetUsed before Get).
EmAssert (fContainer.size () > 0);
T result = fContainer[0];
return result;
}
// ---------------------------------------------------------------------------
// EmThreadSafeQueue::GetFree
// ---------------------------------------------------------------------------
template <class T>
int EmThreadSafeQueue<T>::GetFree (void)
{
omni_mutex_lock lock (fMutex);
return fMaxSize - fContainer.size ();
}
// ---------------------------------------------------------------------------
// EmThreadSafeQueue::GetUsed
// ---------------------------------------------------------------------------
template <class T>
int EmThreadSafeQueue<T>::GetUsed (void)
{
omni_mutex_lock lock (fMutex);
return fContainer.size ();
}
// ---------------------------------------------------------------------------
// EmThreadSafeQueue::WaitForDataAvailable
// ---------------------------------------------------------------------------
template <class T>
Bool EmThreadSafeQueue<T>::WaitForDataAvailable (long timeoutms)
{
#if HAS_OMNI_THREAD
// calc absolute time to wait until:
unsigned long sec;
unsigned long nanosec;
omni_thread::get_time (&sec, &nanosec, 0, timeoutms * 1000);
return fAvailable.timedwait (sec, nanosec) == 1;
#else
UNUSED_PARAM (timeoutms)
return fContainer.size () > 0;
#endif
}
// ---------------------------------------------------------------------------
// EmThreadSafeQueue::Clear
// ---------------------------------------------------------------------------
template <class T>
void EmThreadSafeQueue<T>::Clear (void)
{
omni_mutex_lock lock (fMutex);
fContainer.clear ();
}
// ---------------------------------------------------------------------------
// EmThreadSafeQueue::GetMaxSize
// ---------------------------------------------------------------------------
template <class T>
int EmThreadSafeQueue<T>::GetMaxSize (void)
{
return fMaxSize;
}
// Instantiate the ones we want.
#include "EmSession.h" // uint8 (Byte), EmButtonEvent, EmKeyEvent, EmPenEvent
template class EmThreadSafeQueue<uint8>;
template class EmThreadSafeQueue<EmButtonEvent>;
template class EmThreadSafeQueue<EmKeyEvent>;
template class EmThreadSafeQueue<EmPenEvent>;
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