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Mutex.cpp
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Mutex.cpp
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/*
Mutex class library for Arduino (tm), version 1.0
Copyright (C) 2013 F1RMB, Daniel Caujolle-Bert <f1rmb.daniel@gmail.com>
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "Mutex.h"
Mutex::Mutex()
{
//ctor
m_count = 1;
}
Mutex::~Mutex()
{
//dtor
}
uint8_t Mutex::_interlockedExchange(uint8_t v)
{
uint8_t ov = m_count;
m_count = v;
return (ov);
}
void Mutex::lock()
{
uint8_t prev;
while(1)
{
while (m_count == 0) { };
prev = _interlockedExchange(0);
if (prev == 1)
break;
}
}
void Mutex::unlock()
{
(void) _interlockedExchange(1);
}
boolean Mutex::isLocked()
{
if (m_count == 0)
return (true);
return (false);
}