| commit | author | age | ||
| 8c7455 | 1 | |
| JS | 2 | |
| 3 | /* | |
| 4 | Polhemus Tracker Terminal version 1.0.0 -- Terminal Interface to Polhemus Trackers: Fastrak, Patriot, and Liberty | |
| 5 | Copyright © 2009 Polhemus, Inc. | |
| 6 | ||
| 7 | This file is part of Tracker Terminal. | |
| 8 | ||
| 9 | Tracker Terminal is free software: you can redistribute it and/or modify | |
| 10 | it under the terms of the GNU General Public License as published by | |
| 11 | the Free Software Foundation, either version 3 of the License, or | |
| 12 | (at your option) any later version. | |
| 13 | ||
| 14 | Tracker Terminal is distributed in the hope that it will be useful, | |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 17 | GNU General Public License for more details. | |
| 18 | ||
| 19 | You should have received a copy of the GNU General Public License | |
| 20 | along with Tracker Terminal. If not, see <http://www.gnu.org/licenses/>. | |
| 21 | ||
| 22 | ************************************************************************* | |
| 23 | ||
| 24 | Tracker Terminal version 1.0.0 uses the libusb library version 1.0 | |
| 25 | libusb Copyright © 2007-2008 Daniel Drake <dsd@gentoo.org> | |
| 26 | libusb Copyright © 2001 Johannes Erdfelt <johannes@erdfelt.com> | |
| 27 | Licensed under the GNU Lesser General Public License version 2.1 or later. | |
| 28 | */ | |
| 29 | ||
| 30 | ||
| 31 | ||
| 32 | #include <pthread.h> | |
| 33 | #include "PingPong.h" | |
| 34 | #include <string.h> | |
| 35 | ||
| 36 | ||
| 37 | PingPong::PingPong(){ | |
| 38 | for (int i=0;i<NUMBUFS;i++){ | |
| 39 | m_buf[i]=NULL; | |
| 40 | m_len[i]=0; | |
| 41 | } | |
| 42 | m_readInd=m_writeInd=m_size=0; | |
| 43 | ||
| 44 | // init the mutex to synchronize reads and writes between different threads | |
| 45 | pthread_mutex_init(&m_mutex,NULL); | |
| 46 | } | |
| 47 | ||
| 48 | PingPong::~PingPong(){ | |
| 49 | ||
| 50 | // need to clean up | |
| 51 | for (int i=0;i<NUMBUFS;i++){ | |
| 52 | if (m_buf[i]) | |
| 53 | delete[] m_buf[i]; | |
| 54 | } | |
| 55 | } | |
| 56 | ||
| 57 | // create buffers | |
| 58 | int PingPong::InitPingPong(int bufSize){ | |
| 59 | ||
| 60 | int memerr=0; | |
| 61 | for (int i=0;i<NUMBUFS;i++){ | |
| 62 | m_buf[i]=new BYTE[bufSize]; | |
| 63 | if (!m_buf[i]){ | |
| 64 | memerr=1; | |
| 65 | break; | |
| 66 | } | |
| 67 | } | |
| 68 | if (memerr){ | |
| 69 | for (int i=0;i<NUMBUFS;i++){ | |
| 70 | if (m_buf[i]){ | |
| 71 | delete[] m_buf[i]; | |
| 72 | m_buf[i]=NULL; | |
| 73 | } | |
| 74 | } | |
| 75 | return -1; | |
| 76 | } | |
| 77 | ||
| 78 | ||
| 79 | m_size=bufSize; | |
| 80 | return 0; | |
| 81 | } | |
| 82 | ||
| 83 | int PingPong::GetBufferSize(){ | |
| 84 | return m_size; | |
| 85 | } | |
| 86 | ||
| 87 | // return number of bytes available in read buffer | |
| 88 | int PingPong::IsDataAvail(){ | |
| 89 | ||
| 90 | return m_len[m_readInd]; | |
| 91 | } | |
| 92 | ||
| 93 | //#include <stdio.h> | |
| 94 | ||
| 95 | // read from the read buffer | |
| 96 | int PingPong::ReadPP(BYTE* buf){ | |
| 97 | ||
| 98 | pthread_mutex_lock(&m_mutex); | |
| 99 | int len=m_len[m_readInd]; | |
| 100 | ||
| 101 | if (len==0){ | |
| 102 | pthread_mutex_unlock(&m_mutex); | |
| 103 | return 0; | |
| 104 | } | |
| 105 | ||
| 106 | memcpy(buf,m_buf[m_readInd],len); | |
| 107 | m_len[m_readInd]=0; | |
| 108 | // printf("Read %d bytes from buffer %d\n",len,m_readInd); | |
| 109 | IncrInd(m_readInd); | |
| 110 | ||
| 111 | pthread_mutex_unlock(&m_mutex); | |
| 112 | ||
| 113 | return len; | |
| 114 | } | |
| 115 | ||
| 116 | ||
| 117 | // write to the write buffer | |
| 118 | int PingPong::WritePP(BYTE* buf,int len){ | |
| 119 | ||
| 120 | int rv=0; | |
| 121 | ||
| 122 | pthread_mutex_lock(&m_mutex); | |
| 123 | ||
| 124 | if(len>m_size) | |
| 125 | len=m_size; | |
| 126 | ||
| 127 | if (m_len[m_writeInd]==0){ // don't overwrite unread data | |
| 128 | memcpy(m_buf[m_writeInd],buf,len); | |
| 129 | m_len[m_writeInd]=len; | |
| 130 | // printf("Wrote %d bytes to buffer %d\n",len,m_writeInd); | |
| 131 | IncrInd(m_writeInd); | |
| 132 | rv=len; | |
| 133 | } | |
| 134 | ||
| 135 | pthread_mutex_unlock(&m_mutex); | |
| 136 | return rv; | |
| 137 | } | |
| 138 | ||
| 139 | // increment the index to the next in progression | |
| 140 | void PingPong::IncrInd(int& index){ | |
| 141 | ||
| 142 | index++; | |
| 143 | if (index==NUMBUFS) | |
| 144 | index=0; | |
| 145 | } | |
| 146 | ||
| 147 | void PingPong::ClearBuffers(){ | |
| 148 | ||
| 149 | pthread_mutex_lock(&m_mutex); | |
| 150 | for (int i=0;i<NUMBUFS;i++) | |
| 151 | m_len[i]=0; | |
| 152 | ||
| 153 | m_readInd=m_writeInd=0; | |
| 154 | pthread_mutex_unlock(&m_mutex); | |
| 155 | } | |
