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Disk ARchive
2.5.2
Full featured and portable backup and archiving tool
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00001 /*********************************************************************/ 00002 // dar - disk archive - a backup/restoration program 00003 // Copyright (C) 2002-2052 Denis Corbin 00004 // 00005 // This program is free software; you can redistribute it and/or 00006 // modify it under the terms of the GNU General Public License 00007 // as published by the Free Software Foundation; either version 2 00008 // of the License, or (at your option) any later version. 00009 // 00010 // This program is distributed in the hope that it will be useful, 00011 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00013 // GNU General Public License for more details. 00014 // 00015 // You should have received a copy of the GNU General Public License 00016 // along with this program; if not, write to the Free Software 00017 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 00018 // 00019 // to contact the author : http://dar.linux.free.fr/email.html 00020 /*********************************************************************/ 00021 00026 00027 00028 #ifndef GENERIC_THREAD_HPP 00029 #define GENERIC_THREAD_HPP 00030 00031 #include "../my_config.h" 00032 00033 #include "generic_file.hpp" 00034 #include "messaging.hpp" 00035 #include "slave_thread.hpp" 00036 #include "erreurs.hpp" 00037 00038 namespace libdar 00039 { 00040 00041 00042 class generic_thread : public generic_file 00043 { 00044 public: 00045 // default values for constuctor 00046 static const unsigned int tampon_block_size = 102401; 00047 static const unsigned int tampon_num_block = 1000; 00048 static const unsigned int tampon_block_size_ctrl = 1024; 00049 static const unsigned int tampon_num_block_ctrl = 10; 00050 00058 generic_thread(generic_file *ptr, 00059 U_I data_block_size = tampon_block_size, 00060 U_I data_num_block = tampon_num_block, 00061 U_I ctrl_block_size = tampon_block_size_ctrl, 00062 U_I ctrl_num_block = tampon_num_block_ctrl); 00063 generic_thread(const generic_thread & ref); //< copy constructor is disabled (throws exception) 00064 const generic_thread & operator = (const generic_thread & ref) { throw SRC_BUG; }; 00065 virtual ~generic_thread(); 00066 00067 // inherited methods from generic_file 00068 00069 virtual bool skippable(skippability direction, const infinint & amount); 00070 virtual bool skip(const infinint & pos); 00071 virtual bool skip_to_eof(); 00072 virtual bool skip_relative(S_I x); 00073 virtual infinint get_position() const; 00074 00075 protected: 00076 // inherited from generic_file 00077 virtual void inherited_read_ahead(const infinint & amount); 00078 virtual U_I inherited_read(char *a, U_I size); 00079 virtual void inherited_write(const char *a, U_I size); 00080 00085 virtual void inherited_sync_write(); 00086 virtual void inherited_flush_read(); 00087 virtual void inherited_terminate(); 00088 00089 00090 private: 00091 libthreadar::fast_tampon<char> toslave_data; 00092 libthreadar::fast_tampon<char> tomaster_data; 00093 libthreadar::fast_tampon<char> toslave_ctrl; 00094 libthreadar::fast_tampon<char> tomaster_ctrl; 00095 slave_thread *remote; 00096 bool reached_eof; //< whether we reached end of file 00097 char data_header; //< contains 1 byte header for data 00098 char data_header_eof; //< contains 1 byte header for data + eof 00099 bool running; //< whether a remote is expected to run, tid is then set 00100 pthread_t tid; //< thread id of remote 00101 00102 // the following variables are locally used in quite all methods 00103 // they do not contain valuable information outside each method call 00104 messaging_encode order; 00105 messaging_decode answer; 00106 unsigned int num; 00107 char *ptr; 00108 label dataname; 00109 00110 void send_order(); 00111 void read_answer(); //< \note ptr must be released/recycled after this call 00112 void check_answer(msg_type expected); 00113 void wake_up_slave_if_asked(); //< check whether an order to wakeup the slave has been received, and send wake up the slave 00114 void release_block_answer() { tomaster_ctrl.fetch_recycle(ptr); ptr = nullptr; }; 00115 void release_data_ptr(); 00116 void purge_data_pipe(); //< drops all data in the toslave_data pipe 00117 void my_run(); 00118 void my_join(); 00119 }; 00120 00121 } // end of namespace 00122 00123 #endif