[0b990d] | 1 | //
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| 2 | // memshm.cc
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| 3 | //
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| 4 | // Copyright (C) 1996 Limit Point Systems, Inc.
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| 5 | //
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| 6 | // Author: Curtis Janssen <cljanss@limitpt.com>
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| 7 | // Maintainer: LPS
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| 8 | //
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| 9 | // This file is part of the SC Toolkit.
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| 10 | //
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| 11 | // The SC Toolkit is free software; you can redistribute it and/or modify
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| 12 | // it under the terms of the GNU Library General Public License as published by
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| 13 | // the Free Software Foundation; either version 2, or (at your option)
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| 14 | // any later version.
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| 15 | //
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| 16 | // The SC Toolkit is distributed in the hope that it will be useful,
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| 17 | // but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 19 | // GNU Library General Public License for more details.
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| 20 | //
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| 21 | // You should have received a copy of the GNU Library General Public License
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| 22 | // along with the SC Toolkit; see the file COPYING.LIB. If not, write to
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| 23 | // the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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| 24 | //
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| 25 | // The U.S. Government is granted a limited license as per AL 91-7.
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| 26 | //
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| 27 |
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| 28 | #ifndef _util_group_memshm_cc
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| 29 | #define _util_group_memshm_cc
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| 30 |
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| 31 | #ifdef __GNUC__
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| 32 | #pragma implementation
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| 33 | #endif
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| 34 |
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| 35 | #include <util/misc/formio.h>
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| 36 | #include <util/group/pool.h>
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| 37 | #include <util/group/memshm.h>
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| 38 | #include <limits.h>
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| 39 | #include <errno.h>
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| 40 |
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| 41 | using namespace std;
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| 42 | using namespace sc;
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| 43 |
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| 44 | #ifndef SHMMAX
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| 45 | // glibc 2.0.3 isn't defining SHMMAX so make set it here
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| 46 | # ifdef __linux__
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| 47 | # define SHMMAX 0x1000000
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| 48 | # else
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| 49 | # define SHMMAX INT_MAX
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| 50 | # endif
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| 51 | #endif
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| 52 |
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| 53 | #ifndef SHMMIN
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| 54 | #define SHMMIN 1
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| 55 | #endif
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| 56 |
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| 57 | #ifndef SIMPLE_LOCK
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| 58 | #define SIMPLE_LOCK 1
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| 59 | #endif
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| 60 |
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| 61 | #undef DEBUG
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| 62 |
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| 63 | static ClassDesc ShmMemoryGrp_cd(
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| 64 | typeid(ShmMemoryGrp),"ShmMemoryGrp",1,"public MsgMemoryGrp",
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| 65 | 0, create<ShmMemoryGrp>, 0);
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| 66 |
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| 67 | ShmMemoryGrp::ShmMemoryGrp(const Ref<MessageGrp>& msg):
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| 68 | MsgMemoryGrp(msg)
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| 69 | {
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| 70 | update_ = 0;
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| 71 | data_ = 0;
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| 72 | memory_ = 0;
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| 73 | pool_ = 0;
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| 74 | rangelock_ = 0;
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| 75 | nregion_ = 0;
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| 76 | shmid_ = 0;
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| 77 | attach_address_ = 0;
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| 78 | }
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| 79 |
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| 80 | ShmMemoryGrp::ShmMemoryGrp(const Ref<KeyVal>& keyval):
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| 81 | MsgMemoryGrp(keyval)
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| 82 | {
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| 83 | update_ = 0;
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| 84 | data_ = 0;
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| 85 | memory_ = 0;
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| 86 | pool_ = 0;
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| 87 | rangelock_ = 0;
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| 88 | nregion_ = 0;
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| 89 | shmid_ = 0;
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| 90 | attach_address_ = 0;
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| 91 | }
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| 92 |
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| 93 | int
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| 94 | ShmMemoryGrp::attach_memory(void *ataddress, int size)
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| 95 | {
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| 96 | int i;
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| 97 | int fail = 0;
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| 98 | int isize;
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| 99 | int rsize = size;
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| 100 | for (i=0; i<nregion_; i++) {
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| 101 | attach_address_[i] = 0;
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| 102 | }
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| 103 | for (i=0; rsize>0; i++,rsize-=isize) {
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| 104 | isize = rsize;
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| 105 | if (isize > SHMMAX) isize = SHMMAX;
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| 106 | else if (isize < SHMMIN) isize = SHMMIN;
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| 107 | if (debug_) {
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| 108 | ExEnv::outn() << me() << ": ";
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| 109 | ExEnv::outn() << "ShmMemoryGrp: attaching segment with "
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| 110 | << isize << " bytes at address " << (void*)ataddress
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| 111 | << " on node " << me()
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| 112 | << endl;
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| 113 | }
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| 114 | attach_address_[i] = shmat(shmid_[i],(SHMTYPE)ataddress,0);
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| 115 | if (debug_) {
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| 116 | ExEnv::outn() << me() << ": ";
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| 117 | ExEnv::outn() << "ShmMemoryGrp: got address "
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| 118 | << (void*)attach_address_[i]
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| 119 | << " on node " << me()
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| 120 | << endl;
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| 121 | }
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| 122 | if (attach_address_[i] == 0
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| 123 | || attach_address_[i] == (void*) -1
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| 124 | || ataddress && attach_address_[i] != ataddress) {
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| 125 | //ExEnv::outn() << "ShmMemoryGrp: shmat: problem attaching using address: "
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| 126 | // << " " << (void*) ataddress
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| 127 | // << ": got address: "
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| 128 | // << (void*) attach_address_[i]
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| 129 | // << " on node " << me()
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| 130 | // << endl;
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| 131 | fail = 1;
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| 132 | }
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| 133 | ataddress = (void*)((char*)(attach_address_[i]) + isize);
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| 134 | }
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| 135 |
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| 136 | memory_ = (void*) attach_address_[0];
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| 137 |
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| 138 | if (fail) detach_memory();
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| 139 |
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| 140 | return fail;
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| 141 | }
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| 142 |
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| 143 | void
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| 144 | ShmMemoryGrp::detach_memory()
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| 145 | {
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| 146 | int i;
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| 147 | for (i=0; i<nregion_; i++) {
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| 148 | if (attach_address_[i] != 0 && attach_address_[i] != (void*) -1) {
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| 149 | if (debug_) {
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| 150 | ExEnv::outn() << "detaching " << (void*)attach_address_[i]
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| 151 | << " on node " << me() << endl;
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| 152 | }
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| 153 | shmdt((SHMTYPE)attach_address_[i]);
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| 154 | }
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| 155 | attach_address_[i] = 0;
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| 156 | }
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| 157 | }
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| 158 |
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| 159 | void
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| 160 | ShmMemoryGrp::set_localsize(size_t localsize)
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| 161 | {
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| 162 | int i;
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| 163 |
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| 164 | cleanup();
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| 165 |
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| 166 | MsgMemoryGrp::set_localsize(localsize);
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| 167 |
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| 168 | const int poolallocation = 160000;
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| 169 |
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| 170 | update_ = new GlobalCounter[n()];
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| 171 |
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| 172 | // allocate memory both the data and the Pool
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| 173 | int size = poolallocation + distsize_to_size(totalsize());
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| 174 | // compute the number of shared memory regions that will be needed
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| 175 | nregion_ = size/SHMMAX;
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| 176 | if (size%SHMMAX) nregion_++;
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| 177 | shmid_ = new int[nregion_];
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| 178 | attach_address_ = new void*[nregion_];
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| 179 |
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| 180 | // get the shared memory segments
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| 181 | if (me() == 0) {
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| 182 | int rsize = size;
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| 183 | int isize;
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| 184 | for (i=0; rsize>0; i++,rsize-=isize) {
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| 185 | isize = rsize;
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| 186 | if (isize > SHMMAX) isize = SHMMAX;
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| 187 | else if (isize < SHMMIN) isize = SHMMIN;
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| 188 | if (debug_) {
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| 189 | ExEnv::outn() << me() << ": ";
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| 190 | ExEnv::outn() << "ShmMemoryGrp: getting segment with " << isize
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| 191 | << " bytes" << endl;
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| 192 | }
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| 193 | shmid_[i] = shmget(IPC_PRIVATE, isize, IPC_CREAT | SHM_R | SHM_W);
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| 194 | if (shmid_[i] == -1) {
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| 195 | ExEnv::outn() << me() << ": ";
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| 196 | ExEnv::outn() << "ShmMemoryGrp: shmget failed for "
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| 197 | << isize << " bytes: "
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| 198 | << strerror(errno) << endl;
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| 199 | abort();
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| 200 | }
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| 201 | }
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| 202 | }
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| 203 |
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| 204 | if (me() == 0) {
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| 205 | lock_.initialize();
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| 206 | lock_ = 1;
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| 207 | char * stringrep = lock_.stringrep();
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| 208 | int length = strlen(stringrep) + 1;
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| 209 | msg_->bcast(&length, 1);
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| 210 | msg_->bcast(stringrep, length);
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| 211 | #ifdef DEBUG
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| 212 | ExEnv::outn() << scprintf("%d: sent initialize string of \"%s\" (%d)\n",
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| 213 | me(), stringrep, length);
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| 214 | ExEnv::outn().flush();
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| 215 | #endif // DEBUG
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| 216 | delete[] stringrep;
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| 217 | for (i=0; i<n(); i++) {
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| 218 | update_[i].initialize();
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| 219 | char * stringrep = update_[i].stringrep();
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| 220 | int length = strlen(stringrep) + 1;
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| 221 | msg_->bcast(&length, 1);
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| 222 | msg_->bcast(stringrep, length);
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| 223 | #ifdef DEBUG
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| 224 | ExEnv::outn() << scprintf("%d: sent initialize string of \"%s\" (%d) for %d\n",
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| 225 | me(), stringrep, length, i);
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| 226 | ExEnv::outn().flush();
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| 227 | #endif // DEBUG
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| 228 | delete[] stringrep;
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| 229 | }
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| 230 | }
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| 231 | else {
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| 232 | int length;
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| 233 | msg_->bcast(&length, 1);
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| 234 | char * stringrep = new char[length];
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| 235 | msg_->bcast(stringrep, length);
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| 236 | #ifdef DEBUG
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| 237 | ExEnv::outn() << scprintf("%d: got initialize string of \"%s\" (%d)\n",
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| 238 | me(), stringrep, length);
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| 239 | ExEnv::outn().flush();
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| 240 | #endif // DEBUG
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| 241 | lock_.initialize(stringrep);
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| 242 | delete[] stringrep;
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| 243 | for (i=0; i<n(); i++) {
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| 244 | msg_->bcast(&length, 1);
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| 245 | stringrep = new char[length];
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| 246 | msg_->bcast(stringrep, length);
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| 247 | #ifdef DEBUG
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| 248 | ExEnv::outn() << scprintf("%d: got initialize string of \"%s\" (%d) for %d\n",
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| 249 | me(), stringrep, length, i);
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| 250 | ExEnv::outn().flush();
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| 251 | #endif // DEBUG
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| 252 | update_[i].initialize(stringrep);
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| 253 | delete[] stringrep;
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| 254 | }
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| 255 | }
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| 256 |
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| 257 | // get an initial starting address on node 0
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| 258 | int ntry = 20;
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| 259 | int itry;
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| 260 | void *address;
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| 261 | if (me() == 0) {
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| 262 | address = 0;
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| 263 | itry = 0;
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| 264 | while (attach_memory(address,size) && itry < ntry) {
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| 265 | if (address == 0) address = memory_;
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| 266 | else address = (void*) &((char*)address)[0x1000000];
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| 267 | itry++;
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| 268 | }
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| 269 | if (itry == ntry) {
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| 270 | ExEnv::errn() << "ShmMemoryGrp: ntry exhausted on node 0" << endl;
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| 271 | abort();
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| 272 | }
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| 273 | // detach again, since we all try together below
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| 274 | detach_memory();
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| 275 | }
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| 276 |
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| 277 | msg_->bcast(shmid_, nregion_);
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| 278 | msg_->raw_bcast((void*)&memory_, sizeof(void*));
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| 279 |
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| 280 | address = memory_;
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| 281 | itry = 0;
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| 282 | int fail;
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| 283 | do {
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| 284 | fail = attach_memory(address,size);
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| 285 | msg_->max(fail);
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| 286 | if (fail) {
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| 287 | detach_memory();
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| 288 | }
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| 289 | address = (void*) &((char*)address)[0x1000000];
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| 290 | itry++;
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| 291 | } while(fail && itry < ntry);
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| 292 | if (itry == ntry) {
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| 293 | ExEnv::errn() << "ShmMemoryGrp: ntry exhausted on node " << me()
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| 294 | << " on joint attach phase" << endl;
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| 295 | abort();
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| 296 | }
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| 297 |
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| 298 | if (me() == 0) {
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| 299 | // initialize the pool
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| 300 | pool_ = new(memory_) Pool(poolallocation);
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| 301 | rangelock_ = new(pool_->allocate(sizeof(RangeLock))) RangeLock(pool_);
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| 302 | }
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| 303 |
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| 304 | msg_->raw_bcast((void*)&pool_, sizeof(void*));
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| 305 | msg_->raw_bcast((void*)&rangelock_, sizeof(void*));
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| 306 |
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| 307 | if (debug_) {
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| 308 | ExEnv::outn() << scprintf("%d: memory_ = 0x%x shmid_[0] = %d\n",
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| 309 | me(), memory_, shmid_[0]);
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| 310 | }
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| 311 |
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| 312 | data_ = (void *) &((char*)memory_)[poolallocation];
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| 313 | }
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| 314 |
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| 315 | void *
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| 316 | ShmMemoryGrp::localdata()
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| 317 | {
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| 318 | return &((char*)data_)[distsize_to_size(localoffset())];
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| 319 | }
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| 320 |
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| 321 | void
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| 322 | ShmMemoryGrp::cleanup()
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| 323 | {
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| 324 |
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| 325 | if (memory_) {
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| 326 | for (int i=0; i<nregion_; i++) {
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| 327 | shmdt((SHMTYPE)attach_address_[i]);
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| 328 | }
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| 329 |
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| 330 | msg_->sync();
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| 331 |
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| 332 | if (me() == 0) {
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| 333 | for (int i=0; i<nregion_; i++) {
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| 334 | shmctl(shmid_[i],IPC_RMID,0);
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| 335 | }
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| 336 | }
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| 337 | memory_ = 0;
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| 338 | }
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| 339 |
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| 340 | delete[] update_;
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| 341 | update_ = 0;
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| 342 |
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| 343 | nregion_ = 0;
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| 344 | delete[] shmid_;
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| 345 | delete[] attach_address_;
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| 346 | shmid_ = 0;
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| 347 | attach_address_ = 0;
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| 348 | }
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| 349 |
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| 350 | ShmMemoryGrp::~ShmMemoryGrp()
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| 351 | {
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| 352 | cleanup();
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| 353 |
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| 354 | #ifdef DEBUG
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| 355 | ExEnv::outn() << scprintf("msg_->nreference() = %d\n", msg_->nreference());
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| 356 | ExEnv::outn().flush();
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| 357 | #endif // DEBUG
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| 358 | msg_ = 0;
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| 359 | }
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| 360 |
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| 361 | void *
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| 362 | ShmMemoryGrp::obtain_readwrite(distsize_t offset, int size)
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| 363 | {
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| 364 | if (offset + size > totalsize()) {
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| 365 | ExEnv::errn() << scprintf("ShmMemoryGrp::obtain_readwrite: arg out of range\n");
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| 366 | abort();
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| 367 | }
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| 368 |
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| 369 | #if SIMPLE_LOCK
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| 370 | obtain_lock();
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| 371 | #else // SIMPLE_LOCK
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| 372 | #ifdef DEBUG
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| 373 | ExEnv::outn() << scprintf("%d: clear_release_count\n", me());
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| 374 | ExEnv::outn().flush();
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| 375 | #endif // DEBUG
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| 376 | clear_release_count();
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| 377 | #ifdef DEBUG
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| 378 | ExEnv::outn() << scprintf("%d: obtain_lock\n", me());
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| 379 | ExEnv::outn().flush();
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| 380 | #endif // DEBUG
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| 381 | obtain_lock();
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| 382 | #ifdef DEBUG
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| 383 | ExEnv::outn() << scprintf("%d: checkeq\n", me());
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| 384 | ExEnv::outn().flush();
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| 385 | #endif
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| 386 | while (!rangelock_->checkeq(offset, offset + size, 0)) {
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| 387 | #ifdef DEBUG
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| 388 | ExEnv::outn() << scprintf("%d: range not zero -- waiting for release\n", me());
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| 389 | ExEnv::outn().flush();
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| 390 | #endif // DEBUG
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| 391 | //rangelock_->print();
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| 392 | release_lock();
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| 393 | wait_for_release();
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| 394 | obtain_lock();
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| 395 | }
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| 396 | rangelock_->decrement(offset, offset + size);
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| 397 | #ifdef DEBUG
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| 398 | ExEnv::outn() << scprintf("%d: after obtain write\n", me());
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| 399 | ExEnv::outn().flush();
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| 400 | //rangelock_->print();
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| 401 | #endif // DEBUG
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| 402 | release_lock();
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| 403 | #endif // SIMPLE_LOCK
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| 404 |
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| 405 | return &((char*)data_)[distsize_to_size(offset)];
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| 406 | }
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| 407 |
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| 408 | void *
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| 409 | ShmMemoryGrp::obtain_readonly(distsize_t offset, int size)
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| 410 | {
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| 411 | if (offset + size > totalsize()) {
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| 412 | ExEnv::errn() << scprintf("ShmMemoryGrp::obtain_readonly: arg out of range\n");
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| 413 | abort();
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| 414 | }
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| 415 |
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| 416 | return &((char*)data_)[distsize_to_size(offset)];
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| 417 | }
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| 418 |
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| 419 | void *
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| 420 | ShmMemoryGrp::obtain_writeonly(distsize_t offset, int size)
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| 421 | {
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| 422 | if (offset + size > totalsize()) {
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| 423 | ExEnv::errn() << scprintf("ShmMemoryGrp::obtain_writeonly: arg out of range\n");
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| 424 | abort();
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| 425 | }
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| 426 |
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| 427 | return &((char*)data_)[distsize_to_size(offset)];
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| 428 | }
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| 429 |
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| 430 | void
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| 431 | ShmMemoryGrp::release_readonly(void *data, distsize_t offset, int size)
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| 432 | {
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| 433 | }
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| 434 |
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| 435 | void
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| 436 | ShmMemoryGrp::release_writeonly(void *data, distsize_t offset, int size)
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| 437 | {
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| 438 | }
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| 439 |
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| 440 | void
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| 441 | ShmMemoryGrp::release_readwrite(void *data, distsize_t offset, int size)
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| 442 | {
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| 443 | #if SIMPLE_LOCK
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| 444 | release_lock();
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| 445 | #else // SIMPLE_LOCK
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| 446 | obtain_lock();
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| 447 | rangelock_->increment(offset, offset + size);
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| 448 | note_release();
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| 449 | #ifdef DEBUG
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| 450 | ExEnv::outn() << scprintf("%d: after release write\n", me());
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| 451 | //rangelock_->print();
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| 452 | ExEnv::outn().flush();
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| 453 | #endif // DEBUG
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| 454 | release_lock();
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| 455 | #endif // SIMPLE_LOCK
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| 456 | }
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| 457 |
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| 458 | void
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| 459 | ShmMemoryGrp::obtain_lock()
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| 460 | {
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| 461 | #ifdef DEBUG
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| 462 | ExEnv::outn() << scprintf("%d: lock val = %d\n", me(), lock_.val());
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| 463 | ExEnv::outn().flush();
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| 464 | #endif // DEBUG
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| 465 | lock_--;
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| 466 | #ifdef DEBUG
|
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| 467 | ExEnv::outn() << scprintf("%d: lock decremented\n", me());
|
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| 468 | ExEnv::outn().flush();
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| 469 | #endif // DEBUG
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| 470 | }
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| 471 |
|
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| 472 | void
|
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| 473 | ShmMemoryGrp::release_lock()
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| 474 | {
|
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| 475 | lock_++;
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| 476 | #ifdef DEBUG
|
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| 477 | ExEnv::outn() << scprintf("%d: incremented lock\n", me());
|
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| 478 | ExEnv::outn().flush();
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| 479 | #endif // DEBUG
|
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| 480 | }
|
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| 481 |
|
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| 482 | void
|
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| 483 | ShmMemoryGrp::note_release()
|
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| 484 | {
|
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| 485 | for (int i=0; i<n(); i++) {
|
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| 486 | update_[i]++;
|
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| 487 | }
|
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| 488 | #ifdef DEBUG
|
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| 489 | ExEnv::outn() << scprintf("%d: incremented release flags\n", me());
|
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| 490 | ExEnv::outn().flush();
|
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| 491 | #endif // DEBUG
|
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| 492 | }
|
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| 493 |
|
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| 494 | void
|
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| 495 | ShmMemoryGrp::wait_for_release()
|
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| 496 | {
|
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| 497 | #ifdef DEBUG
|
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| 498 | ExEnv::outn() << scprintf("%d: decrementing release flag\n", me());
|
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| 499 | ExEnv::outn().flush();
|
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| 500 | #endif // DEBUG
|
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| 501 | update_[me()]--;
|
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| 502 | #ifdef DEBUG
|
---|
| 503 | ExEnv::outn() << scprintf("%d: decremented release flag\n", me());
|
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| 504 | ExEnv::outn().flush();
|
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| 505 | #endif // DEBUG
|
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| 506 | }
|
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| 507 |
|
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| 508 | void
|
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| 509 | ShmMemoryGrp::clear_release_count()
|
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| 510 | {
|
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| 511 | update_[me()] = 0;
|
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| 512 | #ifdef DEBUG
|
---|
| 513 | ExEnv::outn() << scprintf("%d: clearing release count\n", me());
|
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| 514 | ExEnv::outn().flush();
|
---|
| 515 | #endif // DEBUG
|
---|
| 516 | }
|
---|
| 517 |
|
---|
| 518 | void
|
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| 519 | ShmMemoryGrp::print(ostream &o) const
|
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| 520 | {
|
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| 521 | MemoryGrp::print(o);
|
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| 522 | }
|
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| 523 |
|
---|
| 524 | #endif
|
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| 525 |
|
---|
| 526 | /////////////////////////////////////////////////////////////////////////////
|
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| 527 |
|
---|
| 528 | // Local Variables:
|
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| 529 | // mode: c++
|
---|
| 530 | // c-file-style: "CLJ"
|
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| 531 | // End:
|
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