90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
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/* mbed USBHost Library
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* Copyright (c) 2006-2013 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MTXCIRCBUFFER_H
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#define MTXCIRCBUFFER_H
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#include "stdint.h"
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#include "rtos.h"
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//Mutex protected circular buffer
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template<typename T, int size>
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class MtxCircBuffer {
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public:
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MtxCircBuffer() {
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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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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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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 flush() {
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write = 0;
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read = 0;
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}
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void queue(T k) {
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mtx.lock();
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while (((write + 1) % size) == read) {
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mtx.unlock();
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Thread::wait(10);
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mtx.lock();
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}
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buf[write++] = k;
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write %= size;
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mtx.unlock();
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}
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uint16_t available() {
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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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mtx.lock();
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bool empty = (read == write);
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if (!empty) {
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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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