Files
osmo-trx/Transceiver52M/radioVector.h
Pau Espin Pedrol 8b0c5368f5 Transceiver: Fix race condition obtaining Dl burst from Upper layer
The queue was being accessed sequentially obtaining and releasing the
mutual exclusion zone twice. First in getStaleBurst() dropping all
FN<currTime, then in getCurrentBurst() trying to obtain FN=currTime.

However, since in between the mutex is released, it could happen that
for instance upper layer would introduce currTime-1 in the queue, which
would make then getCurrentBurst() detect that one instead of potential
currTime in the queue and return NULL.

By holding the mutex during the call to both functions we make sure the
state is kept during the whole transaction.

Related: OS#4487 (comment #7)
Change-Id: If1fd8d7fc5f21ee2894192ef1ac2a3cdda6bbb98
2020-07-10 17:32:03 +02:00

72 lines
2.0 KiB
C++

/*
* Written by Thomas Tsou <ttsou@vt.edu>
* Based on code by Harvind S Samra <hssamra@kestrelsp.com>
*
* Copyright 2011 Free Software Foundation, Inc.
*
* SPDX-License-Identifier: AGPL-3.0+
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* See the COPYING file in the main directory for details.
*/
#ifndef RADIOVECTOR_H
#define RADIOVECTOR_H
#include "sigProcLib.h"
#include "GSMCommon.h"
#include "Interthread.h"
class radioVector {
public:
radioVector(GSM::Time& wTime, size_t size = 0,
size_t start = 0, size_t chans = 1);
radioVector(GSM::Time& wTime, signalVector *vector);
~radioVector();
GSM::Time getTime() const;
void setTime(const GSM::Time& wTime);
bool operator>(const radioVector& other) const;
signalVector *getVector(size_t chan = 0) const;
bool setVector(signalVector *vector, size_t chan = 0);
size_t chans() const { return vectors.size(); }
private:
std::vector<signalVector *> vectors;
GSM::Time mTime;
};
class noiseVector : std::vector<float> {
public:
noiseVector(size_t size = 0);
bool insert(float val);
float avg() const;
private:
size_t itr;
};
class VectorFIFO : public InterthreadQueue<radioVector> { };
class VectorQueue : public InterthreadPriorityQueue<radioVector> {
public:
GSM::Time nextTime() const;
radioVector* getStaleBurst(const GSM::Time& targTime);
radioVector* getCurrentBurst(const GSM::Time& targTime);
Mutex *getMutex() const { return &mLock; };
};
#endif /* RADIOVECTOR_H */