2018.07.26
Dependencies: FATFileSystem3 mbed-rtos
Fork of USBHost by
USBHostSerial/MtxCircBuffer.h
- Committer:
- samux
- Date:
- 2013-03-12
- Revision:
- 4:b320d68e98e7
- Parent:
- 0:a554658735bf
- Child:
- 8:93da8ea2708b
File content as of revision 4:b320d68e98e7:
/* Copyright (c) 2010-2011 mbed.org, MIT License * * Permission is hereby granted, free of charge, to any person obtaining a copy of this software * and associated documentation files (the "Software"), to deal in the Software without * restriction, including without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all copies or * substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #ifndef MTXCIRCBUFFER_H #define MTXCIRCBUFFER_H #include "stdint.h" #include "rtos.h" //Mutex protected circular buffer template<typename T, int size> class MtxCircBuffer { public: MtxCircBuffer() { write = 0; read = 0; } bool isFull() { mtx.lock(); bool r = (((write + 1) % size) == read); mtx.unlock(); return r; } bool isEmpty() { mtx.lock(); bool r = (read == write); mtx.unlock(); return r; } void flush() { write = 0; read = 0; } void queue(T k) { mtx.lock(); while (((write + 1) % size) == read) { mtx.unlock(); Thread::wait(10); mtx.lock(); } buf[write++] = k; write %= size; mtx.unlock(); } uint16_t available() { mtx.lock(); uint16_t a = (write >= read) ? (write - read) : (size - read + write); mtx.unlock(); return a; } bool dequeue(T * c) { mtx.lock(); bool empty = (read == write); if (!empty) { *c = buf[read++]; read %= size; } mtx.unlock(); return (!empty); } private: volatile uint16_t write; volatile uint16_t read; volatile T buf[size]; Mutex mtx; }; #endif