mirror of https://github.com/ARMmbed/mbed-os.git
96 lines
2.2 KiB
C++
96 lines
2.2 KiB
C++
/* MtxCircBuf.h */
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/* Copyright (C) 2012 mbed.org, MIT License
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
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* and associated documentation files (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge, publish, distribute,
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* sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or
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* substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef MTXCIRCBUFFER_H
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#define MTXCIRCBUFFER_H
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#include "rtos.h"
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//Mutex protected circualr buffer
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template<typename T, int size>
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class MtxCircBuffer
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{
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public:
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MtxCircBuffer() //:
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//mtx()
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{
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write = 0;
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read = 0;
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}
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bool isFull()
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{
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mtx.lock();
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bool r = (((write + 1) % size) == read);
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mtx.unlock();
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return r;
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}
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bool isEmpty()
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{
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mtx.lock();
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bool r = (read == write);
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mtx.unlock();
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return r;
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}
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void queue(T k)
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{
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mtx.lock();
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buf[write++] = k;
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write %= size;
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if (isFull())
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{
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read++;
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read %= size;
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}
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mtx.unlock();
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}
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uint16_t available()
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{
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mtx.lock();
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uint16_t a = (write >= read) ? (write - read) : (size - read + write);
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mtx.unlock();
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return a;
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}
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bool dequeue(T * c)
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{
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mtx.lock();
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bool empty = (read == write);
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if (!empty)
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{
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*c = buf[read++];
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read %= size;
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}
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mtx.unlock();
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return (!empty);
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}
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private:
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volatile uint16_t write;
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volatile uint16_t read;
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volatile T buf[size];
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Mutex mtx;
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};
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#endif
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