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| 1 /***************************************************************************** | |
| 2 Copyright (c) 2001 - 2010, The Board of Trustees of the University of Illinois. | |
| 3 All rights reserved. | |
| 4 | |
| 5 Redistribution and use in source and binary forms, with or without | |
| 6 modification, are permitted provided that the following conditions are | |
| 7 met: | |
| 8 | |
| 9 * Redistributions of source code must retain the above | |
| 10 copyright notice, this list of conditions and the | |
| 11 following disclaimer. | |
| 12 | |
| 13 * Redistributions in binary form must reproduce the | |
| 14 above copyright notice, this list of conditions | |
| 15 and the following disclaimer in the documentation | |
| 16 and/or other materials provided with the distribution. | |
| 17 | |
| 18 * Neither the name of the University of Illinois | |
| 19 nor the names of its contributors may be used to | |
| 20 endorse or promote products derived from this | |
| 21 software without specific prior written permission. | |
| 22 | |
| 23 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS | |
| 24 IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, | |
| 25 THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 26 PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR | |
| 27 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 28 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 29 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 30 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
| 31 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
| 32 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
| 33 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 34 *****************************************************************************/ | |
| 35 | |
| 36 /***************************************************************************** | |
| 37 written by | |
| 38 Yunhong Gu, last updated 08/20/2010 | |
| 39 *****************************************************************************/ | |
| 40 | |
| 41 #ifndef __UDT_EPOLL_H__ | |
| 42 #define __UDT_EPOLL_H__ | |
| 43 | |
| 44 | |
| 45 #include <map> | |
| 46 #include <set> | |
| 47 #include "udt.h" | |
| 48 | |
| 49 | |
| 50 struct CEPollDesc | |
| 51 { | |
| 52 int m_iID; // epoll ID | |
| 53 std::set<UDTSOCKET> m_sUDTSocks; // set of UDT sockets waiting for e
vents | |
| 54 | |
| 55 int m_iLocalID; // local system epoll ID | |
| 56 std::set<SYSSOCKET> m_sLocals; // set of local (non-UDT) descripto
rs | |
| 57 | |
| 58 std::set<UDTSOCKET> m_sUDTWrites; // UDT sockets ready for write | |
| 59 std::set<UDTSOCKET> m_sUDTReads; // UDT sockets ready for read | |
| 60 }; | |
| 61 | |
| 62 class CEPoll | |
| 63 { | |
| 64 friend class CUDT; | |
| 65 | |
| 66 public: | |
| 67 CEPoll(); | |
| 68 ~CEPoll(); | |
| 69 | |
| 70 public: // for CUDTUnited API | |
| 71 | |
| 72 // Functionality: | |
| 73 // create a new EPoll. | |
| 74 // Parameters: | |
| 75 // None. | |
| 76 // Returned value: | |
| 77 // new EPoll ID if success, otherwise an error number. | |
| 78 | |
| 79 int create(); | |
| 80 | |
| 81 // Functionality: | |
| 82 // add a UDT socket to an EPoll. | |
| 83 // Parameters: | |
| 84 // 0) [in] eid: EPoll ID. | |
| 85 // 1) [in] u: UDT Socket ID. | |
| 86 // 2) [in] events: events to watch. | |
| 87 // Returned value: | |
| 88 // 0 if success, otherwise an error number. | |
| 89 | |
| 90 int add_usock(const int eid, const UDTSOCKET& u, const int* events = NULL); | |
| 91 | |
| 92 // Functionality: | |
| 93 // add a system socket to an EPoll. | |
| 94 // Parameters: | |
| 95 // 0) [in] eid: EPoll ID. | |
| 96 // 1) [in] s: system Socket ID. | |
| 97 // 2) [in] events: events to watch. | |
| 98 // Returned value: | |
| 99 // 0 if success, otherwise an error number. | |
| 100 | |
| 101 int add_ssock(const int eid, const SYSSOCKET& s, const int* events = NULL); | |
| 102 | |
| 103 // Functionality: | |
| 104 // remove a UDT socket event from an EPoll; socket will be removed if n
o events to watch | |
| 105 // Parameters: | |
| 106 // 0) [in] eid: EPoll ID. | |
| 107 // 1) [in] u: UDT socket ID. | |
| 108 // 2) [in] events: events to delete. | |
| 109 // Returned value: | |
| 110 // 0 if success, otherwise an error number. | |
| 111 | |
| 112 int remove_usock(const int eid, const UDTSOCKET& u, const int* events = NULL)
; | |
| 113 | |
| 114 // Functionality: | |
| 115 // remove a system socket event from an EPoll; socket will be removed i
f no events to watch | |
| 116 // Parameters: | |
| 117 // 0) [in] eid: EPoll ID. | |
| 118 // 1) [in] s: system socket ID. | |
| 119 // 2) [in] events: events to delete. | |
| 120 // Returned value: | |
| 121 // 0 if success, otherwise an error number. | |
| 122 | |
| 123 int remove_ssock(const int eid, const SYSSOCKET& s, const int* events = NULL)
; | |
| 124 | |
| 125 // Functionality: | |
| 126 // wait for EPoll events or timeout. | |
| 127 // Parameters: | |
| 128 // 0) [in] eid: EPoll ID. | |
| 129 // 1) [out] readfds: UDT sockets available for reading. | |
| 130 // 2) [out] writefds: UDT sockets available for writing. | |
| 131 // 3) [in] msTimeOut: timeout threshold, in milliseconds. | |
| 132 // 4) [out] lrfds: system file descriptors for reading. | |
| 133 // 5) [out] lwfds: system file descriptors for writing. | |
| 134 // Returned value: | |
| 135 // number of sockets available for IO. | |
| 136 | |
| 137 int wait(const int eid, std::set<UDTSOCKET>* readfds, std::set<UDTSOCKET>* wr
itefds, int64_t msTimeOut, std::set<SYSSOCKET>* lrfds, std::set<SYSSOCKET>* lwfd
s); | |
| 138 | |
| 139 // Functionality: | |
| 140 // close and release an EPoll. | |
| 141 // Parameters: | |
| 142 // 0) [in] eid: EPoll ID. | |
| 143 // Returned value: | |
| 144 // 0 if success, otherwise an error number. | |
| 145 | |
| 146 int release(const int eid); | |
| 147 | |
| 148 public: // for CUDT to acknowledge IO status | |
| 149 | |
| 150 // Functionality: | |
| 151 // set a UDT socket writable. | |
| 152 // Parameters: | |
| 153 // 0) [in] uid: UDT socket ID. | |
| 154 // 1) [in] eids: EPoll IDs to be set | |
| 155 // Returned value: | |
| 156 // 0 if success, otherwise an error number. | |
| 157 | |
| 158 int enable_write(const UDTSOCKET& uid, std::set<int>& eids); | |
| 159 | |
| 160 // Functionality: | |
| 161 // set a UDT socket readable. | |
| 162 // Parameters: | |
| 163 // 0) [in] uid: UDT socket ID. | |
| 164 // 1) [in] eids: EPoll IDs to be set | |
| 165 // Returned value: | |
| 166 // 0 if success, otherwise an error number. | |
| 167 | |
| 168 int enable_read(const UDTSOCKET& uid, std::set<int>& eids); | |
| 169 | |
| 170 // Functionality: | |
| 171 // reset a the writable status of a UDT socket. | |
| 172 // Parameters: | |
| 173 // 0) [in] uid: UDT socket ID. | |
| 174 // 1) [in] eids: EPoll IDs to be set | |
| 175 // Returned value: | |
| 176 // 0 if success, otherwise an error number. | |
| 177 | |
| 178 int disable_write(const UDTSOCKET& uid, std::set<int>& eids); | |
| 179 | |
| 180 // Functionality: | |
| 181 // reset a the readable status of a UDT socket. | |
| 182 // Parameters: | |
| 183 // 0) [in] uid: UDT socket ID. | |
| 184 // 1) [in] eids: EPoll IDs to be set | |
| 185 // Returned value: | |
| 186 // 0 if success, otherwise an error number. | |
| 187 | |
| 188 int disable_read(const UDTSOCKET& uid, std::set<int>& eids); | |
| 189 | |
| 190 private: | |
| 191 int m_iIDSeed; // seed to generate a new ID | |
| 192 pthread_mutex_t m_SeedLock; | |
| 193 | |
| 194 std::map<int, CEPollDesc> m_mPolls; // all epolls | |
| 195 pthread_mutex_t m_EPollLock; | |
| 196 }; | |
| 197 | |
| 198 | |
| 199 #endif | |
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