annotate data/fileio/MatrixFile.cpp @ 207:8ee6cf529c4e

* Further fix for restoring layer visibility from session file * Better handling of error state in bzip file device to avoid spurious errors * Fix #1495001 deleted layers prevail in saved session file
author Chris Cannam
date Fri, 05 Jan 2007 15:49:10 +0000
parents 6ec58bb8f729
children 0d943a3fcc77
rev   line source
Chris@148 1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
Chris@148 2
Chris@148 3 /*
Chris@148 4 Sonic Visualiser
Chris@148 5 An audio file viewer and annotation editor.
Chris@148 6 Centre for Digital Music, Queen Mary, University of London.
Chris@148 7 This file copyright 2006 Chris Cannam.
Chris@148 8
Chris@148 9 This program is free software; you can redistribute it and/or
Chris@148 10 modify it under the terms of the GNU General Public License as
Chris@148 11 published by the Free Software Foundation; either version 2 of the
Chris@148 12 License, or (at your option) any later version. See the file
Chris@148 13 COPYING included with this distribution for more information.
Chris@148 14 */
Chris@148 15
Chris@148 16 #include "MatrixFile.h"
Chris@148 17 #include "base/TempDirectory.h"
Chris@150 18 #include "system/System.h"
Chris@148 19 #include "base/Profiler.h"
Chris@148 20 #include "base/Exceptions.h"
Chris@148 21
Chris@148 22 #include <sys/types.h>
Chris@148 23 #include <sys/stat.h>
Chris@148 24 #include <fcntl.h>
Chris@148 25 #include <unistd.h>
Chris@148 26
Chris@148 27 #include <iostream>
Chris@148 28
Chris@148 29 #include <cstdio>
Chris@148 30 #include <cassert>
Chris@148 31
Chris@148 32 #include <QFileInfo>
Chris@148 33 #include <QDir>
Chris@148 34
Chris@154 35 //#define DEBUG_MATRIX_FILE 1
Chris@154 36 //#define DEBUG_MATRIX_FILE_READ_SET 1
Chris@148 37
Chris@148 38 #ifdef DEBUG_MATRIX_FILE_READ_SET
Chris@153 39 #ifndef DEBUG_MATRIX_FILE
Chris@148 40 #define DEBUG_MATRIX_FILE 1
Chris@148 41 #endif
Chris@153 42 #endif
Chris@148 43
Chris@148 44 std::map<QString, int> MatrixFile::m_refcount;
Chris@148 45 QMutex MatrixFile::m_refcountMutex;
Chris@148 46
Chris@148 47 MatrixFile::ResizeableBitsetMap MatrixFile::m_columnBitsets;
Chris@148 48 QMutex MatrixFile::m_columnBitsetWriteMutex;
Chris@148 49
Chris@148 50 FileReadThread *MatrixFile::m_readThread = 0;
Chris@148 51
Chris@148 52 static size_t totalStorage = 0;
Chris@148 53 static size_t totalMemory = 0;
Chris@148 54 static size_t totalCount = 0;
Chris@148 55
Chris@148 56 MatrixFile::MatrixFile(QString fileBase, Mode mode,
Chris@148 57 size_t cellSize, bool eagerCache) :
Chris@148 58 m_fd(-1),
Chris@148 59 m_mode(mode),
Chris@148 60 m_flags(0),
Chris@148 61 m_fmode(0),
Chris@148 62 m_cellSize(cellSize),
Chris@148 63 m_width(0),
Chris@148 64 m_height(0),
Chris@148 65 m_headerSize(2 * sizeof(size_t)),
Chris@148 66 m_defaultCacheWidth(1024),
Chris@148 67 m_prevX(0),
Chris@148 68 m_eagerCache(eagerCache),
Chris@148 69 m_requestToken(-1),
Chris@148 70 m_spareData(0),
Chris@148 71 m_columnBitset(0)
Chris@148 72 {
Chris@148 73 Profiler profiler("MatrixFile::MatrixFile", true);
Chris@148 74
Chris@148 75 if (!m_readThread) {
Chris@148 76 m_readThread = new FileReadThread;
Chris@148 77 m_readThread->start();
Chris@148 78 }
Chris@148 79
Chris@148 80 m_cache.data = 0;
Chris@148 81
Chris@148 82 QDir tempDir(TempDirectory::getInstance()->getPath());
Chris@148 83 QString fileName(tempDir.filePath(QString("%1.mfc").arg(fileBase)));
Chris@148 84 bool newFile = !QFileInfo(fileName).exists();
Chris@148 85
Chris@148 86 if (newFile && m_mode == ReadOnly) {
Chris@148 87 std::cerr << "ERROR: MatrixFile::MatrixFile: Read-only mode "
Chris@148 88 << "specified, but cache file does not exist" << std::endl;
Chris@148 89 throw FileNotFound(fileName);
Chris@148 90 }
Chris@148 91
Chris@148 92 if (!newFile && m_mode == ReadWrite) {
Chris@148 93 std::cerr << "Note: MatrixFile::MatrixFile: Read/write mode "
Chris@148 94 << "specified, but file already exists; falling back to "
Chris@148 95 << "read-only mode" << std::endl;
Chris@148 96 m_mode = ReadOnly;
Chris@148 97 }
Chris@148 98
Chris@148 99 if (!eagerCache && m_mode == ReadOnly) {
Chris@148 100 std::cerr << "WARNING: MatrixFile::MatrixFile: Eager cacheing not "
Chris@148 101 << "specified, but file is open in read-only mode -- cache "
Chris@148 102 << "will not be used" << std::endl;
Chris@148 103 }
Chris@148 104
Chris@148 105 m_flags = 0;
Chris@148 106 m_fmode = S_IRUSR | S_IWUSR;
Chris@148 107
Chris@148 108 if (m_mode == ReadWrite) {
Chris@148 109 m_flags = O_RDWR | O_CREAT;
Chris@148 110 } else {
Chris@148 111 m_flags = O_RDONLY;
Chris@148 112 }
Chris@148 113
Chris@148 114 #ifdef DEBUG_MATRIX_FILE
Chris@148 115 std::cerr << "MatrixFile::MatrixFile: opening " << fileName.toStdString() << "..." << std::endl;
Chris@148 116 #endif
Chris@148 117
Chris@148 118 if ((m_fd = ::open(fileName.toLocal8Bit(), m_flags, m_fmode)) < 0) {
Chris@148 119 ::perror("Open failed");
Chris@148 120 std::cerr << "ERROR: MatrixFile::MatrixFile: "
Chris@148 121 << "Failed to open cache file \""
Chris@148 122 << fileName.toStdString() << "\"";
Chris@148 123 if (m_mode == ReadWrite) std::cerr << " for writing";
Chris@148 124 std::cerr << std::endl;
Chris@148 125 throw FailedToOpenFile(fileName);
Chris@148 126 }
Chris@148 127
Chris@148 128 if (newFile) {
Chris@148 129 resize(0, 0); // write header
Chris@148 130 } else {
Chris@148 131 size_t header[2];
Chris@148 132 if (::read(m_fd, header, 2 * sizeof(size_t)) < 0) {
Chris@148 133 perror("Read failed");
Chris@148 134 std::cerr << "ERROR: MatrixFile::MatrixFile: "
Chris@148 135 << "Failed to read header (fd " << m_fd << ", file \""
Chris@148 136 << fileName.toStdString() << "\")" << std::endl;
Chris@148 137 throw FileReadFailed(fileName);
Chris@148 138 }
Chris@148 139 m_width = header[0];
Chris@148 140 m_height = header[1];
Chris@148 141 seekTo(0, 0);
Chris@148 142 }
Chris@148 143
Chris@148 144 m_fileName = fileName;
Chris@148 145
Chris@148 146 m_columnBitsetWriteMutex.lock();
Chris@148 147
Chris@148 148 if (m_columnBitsets.find(m_fileName) == m_columnBitsets.end()) {
Chris@148 149 m_columnBitsets[m_fileName] = new ResizeableBitset;
Chris@148 150 }
Chris@148 151 m_columnBitset = m_columnBitsets[m_fileName];
Chris@148 152
Chris@148 153 m_columnBitsetWriteMutex.unlock();
Chris@148 154
Chris@148 155 QMutexLocker locker(&m_refcountMutex);
Chris@148 156 ++m_refcount[fileName];
Chris@148 157
Chris@148 158 std::cerr << "MatrixFile(" << this << "): fd " << m_fd << ", file " << fileName.toStdString() << ", ref " << m_refcount[fileName] << std::endl;
Chris@148 159
Chris@148 160 // std::cerr << "MatrixFile::MatrixFile: Done, size is " << "(" << m_width << ", " << m_height << ")" << std::endl;
Chris@148 161
Chris@148 162 ++totalCount;
Chris@148 163
Chris@148 164 }
Chris@148 165
Chris@148 166 MatrixFile::~MatrixFile()
Chris@148 167 {
Chris@148 168 char *requestData = 0;
Chris@148 169
Chris@148 170 if (m_requestToken >= 0) {
Chris@148 171 FileReadThread::Request request;
Chris@148 172 if (m_readThread->getRequest(m_requestToken, request)) {
Chris@148 173 requestData = request.data;
Chris@148 174 }
Chris@148 175 m_readThread->cancel(m_requestToken);
Chris@148 176 }
Chris@148 177
Chris@148 178 if (requestData) free(requestData);
Chris@148 179 if (m_cache.data) free(m_cache.data);
Chris@148 180 if (m_spareData) free(m_spareData);
Chris@148 181
Chris@148 182 if (m_fd >= 0) {
Chris@148 183 if (::close(m_fd) < 0) {
Chris@148 184 ::perror("MatrixFile::~MatrixFile: close failed");
Chris@148 185 }
Chris@148 186 }
Chris@148 187
Chris@148 188 if (m_fileName != "") {
Chris@148 189
Chris@148 190 QMutexLocker locker(&m_refcountMutex);
Chris@148 191
Chris@148 192 if (--m_refcount[m_fileName] == 0) {
Chris@148 193
Chris@148 194 if (::unlink(m_fileName.toLocal8Bit())) {
Chris@148 195 ::perror("Unlink failed");
Chris@148 196 std::cerr << "WARNING: MatrixFile::~MatrixFile: reference count reached 0, but failed to unlink file \"" << m_fileName.toStdString() << "\"" << std::endl;
Chris@148 197 } else {
Chris@148 198 std::cerr << "deleted " << m_fileName.toStdString() << std::endl;
Chris@148 199 }
Chris@148 200
Chris@148 201 QMutexLocker locker2(&m_columnBitsetWriteMutex);
Chris@148 202 m_columnBitsets.erase(m_fileName);
Chris@148 203 delete m_columnBitset;
Chris@148 204 }
Chris@148 205 }
Chris@148 206
Chris@148 207 totalStorage -= (m_headerSize + (m_width * m_height * m_cellSize));
Chris@148 208 totalMemory -= (2 * m_defaultCacheWidth * m_height * m_cellSize);
Chris@148 209 totalCount --;
Chris@148 210
Chris@148 211 std::cerr << "MatrixFile::~MatrixFile: " << std::endl;
Chris@148 212 std::cerr << "Total storage now " << totalStorage/1024 << "K, theoretical max memory "
Chris@148 213 << totalMemory/1024 << "K in " << totalCount << " instances" << std::endl;
Chris@148 214
Chris@148 215 }
Chris@148 216
Chris@148 217 void
Chris@148 218 MatrixFile::resize(size_t w, size_t h)
Chris@148 219 {
Chris@148 220 Profiler profiler("MatrixFile::resize", true);
Chris@148 221
Chris@148 222 assert(m_mode == ReadWrite);
Chris@148 223
Chris@148 224 QMutexLocker locker(&m_fdMutex);
Chris@148 225
Chris@148 226 totalStorage -= (m_headerSize + (m_width * m_height * m_cellSize));
Chris@148 227 totalMemory -= (2 * m_defaultCacheWidth * m_height * m_cellSize);
Chris@148 228
Chris@148 229 off_t off = m_headerSize + (w * h * m_cellSize);
Chris@148 230
Chris@148 231 #ifdef DEBUG_MATRIX_FILE
Chris@148 232 std::cerr << "MatrixFile::resize(" << w << ", " << h << "): resizing file" << std::endl;
Chris@148 233 #endif
Chris@148 234
Chris@148 235 if (w * h < m_width * m_height) {
Chris@148 236 if (::ftruncate(m_fd, off) < 0) {
Chris@148 237 ::perror("WARNING: MatrixFile::resize: ftruncate failed");
Chris@148 238 throw FileOperationFailed(m_fileName, "ftruncate");
Chris@148 239 }
Chris@148 240 }
Chris@148 241
Chris@148 242 m_width = 0;
Chris@148 243 m_height = 0;
Chris@148 244
Chris@148 245 if (::lseek(m_fd, 0, SEEK_SET) == (off_t)-1) {
Chris@148 246 ::perror("ERROR: MatrixFile::resize: Seek to write header failed");
Chris@148 247 throw FileOperationFailed(m_fileName, "lseek");
Chris@148 248 }
Chris@148 249
Chris@148 250 size_t header[2];
Chris@148 251 header[0] = w;
Chris@148 252 header[1] = h;
Chris@148 253 if (::write(m_fd, header, 2 * sizeof(size_t)) != 2 * sizeof(size_t)) {
Chris@148 254 ::perror("ERROR: MatrixFile::resize: Failed to write header");
Chris@148 255 throw FileOperationFailed(m_fileName, "write");
Chris@148 256 }
Chris@148 257
Chris@148 258 if (w > 0 && m_defaultCacheWidth > w) {
Chris@148 259 m_defaultCacheWidth = w;
Chris@148 260 }
Chris@148 261
Chris@148 262 static size_t maxCacheMB = 16;
Chris@148 263 if (2 * m_defaultCacheWidth * h * m_cellSize > maxCacheMB * 1024 * 1024) { //!!!
Chris@148 264 m_defaultCacheWidth = (maxCacheMB * 1024 * 1024) / (2 * h * m_cellSize);
Chris@148 265 if (m_defaultCacheWidth < 16) m_defaultCacheWidth = 16;
Chris@148 266 }
Chris@148 267
Chris@148 268 if (m_columnBitset) {
Chris@148 269 QMutexLocker locker(&m_columnBitsetWriteMutex);
Chris@148 270 m_columnBitset->resize(w);
Chris@148 271 }
Chris@148 272
Chris@148 273 if (m_cache.data) {
Chris@148 274 free(m_cache.data);
Chris@148 275 m_cache.data = 0;
Chris@148 276 }
Chris@148 277
Chris@148 278 if (m_spareData) {
Chris@148 279 free(m_spareData);
Chris@148 280 m_spareData = 0;
Chris@148 281 }
Chris@148 282
Chris@148 283 m_width = w;
Chris@148 284 m_height = h;
Chris@148 285
Chris@148 286 totalStorage += (m_headerSize + (m_width * m_height * m_cellSize));
Chris@148 287 totalMemory += (2 * m_defaultCacheWidth * m_height * m_cellSize);
Chris@148 288
Chris@148 289 #ifdef DEBUG_MATRIX_FILE
Chris@148 290 std::cerr << "MatrixFile::resize(" << w << ", " << h << "): cache width "
Chris@148 291 << m_defaultCacheWidth << ", storage "
Chris@148 292 << (m_headerSize + w * h * m_cellSize) << ", mem "
Chris@148 293 << (2 * h * m_defaultCacheWidth * m_cellSize) << std::endl;
Chris@148 294
Chris@148 295 std::cerr << "Total storage " << totalStorage/1024 << "K, theoretical max memory "
Chris@148 296 << totalMemory/1024 << "K in " << totalCount << " instances" << std::endl;
Chris@148 297 #endif
Chris@148 298
Chris@148 299 seekTo(0, 0);
Chris@148 300 }
Chris@148 301
Chris@148 302 void
Chris@148 303 MatrixFile::reset()
Chris@148 304 {
Chris@148 305 Profiler profiler("MatrixFile::reset", true);
Chris@148 306
Chris@148 307 assert (m_mode == ReadWrite);
Chris@148 308
Chris@148 309 if (m_eagerCache) {
Chris@148 310 void *emptyCol = calloc(m_height, m_cellSize);
Chris@148 311 for (size_t x = 0; x < m_width; ++x) setColumnAt(x, emptyCol);
Chris@148 312 free(emptyCol);
Chris@148 313 }
Chris@148 314
Chris@148 315 if (m_columnBitset) {
Chris@148 316 QMutexLocker locker(&m_columnBitsetWriteMutex);
Chris@148 317 m_columnBitset->resize(m_width);
Chris@148 318 }
Chris@148 319 }
Chris@148 320
Chris@148 321 void
Chris@148 322 MatrixFile::getColumnAt(size_t x, void *data)
Chris@148 323 {
Chris@148 324 // Profiler profiler("MatrixFile::getColumnAt");
Chris@148 325
Chris@148 326 // assert(haveSetColumnAt(x));
Chris@148 327
Chris@148 328 if (getFromCache(x, 0, m_height, data)) return;
Chris@148 329
Chris@148 330 // Profiler profiler2("MatrixFile::getColumnAt (uncached)");
Chris@148 331
Chris@148 332 ssize_t r = 0;
Chris@148 333
Chris@148 334 #ifdef DEBUG_MATRIX_FILE
Chris@148 335 std::cerr << "MatrixFile::getColumnAt(" << x << ")"
Chris@148 336 << ": reading the slow way";
Chris@148 337
Chris@148 338 if (m_requestToken >= 0 &&
Chris@148 339 x >= m_requestingX &&
Chris@148 340 x < m_requestingX + m_requestingWidth) {
Chris@148 341
Chris@148 342 std::cerr << " (awaiting " << m_requestingX << ", " << m_requestingWidth << " from disk)";
Chris@148 343 }
Chris@148 344
Chris@148 345 std::cerr << std::endl;
Chris@148 346 #endif
Chris@148 347
Chris@148 348 m_fdMutex.lock();
Chris@148 349
Chris@148 350 if (seekTo(x, 0)) {
Chris@148 351 r = ::read(m_fd, data, m_height * m_cellSize);
Chris@148 352 }
Chris@148 353
Chris@148 354 m_fdMutex.unlock();
Chris@148 355
Chris@148 356 if (r < 0) {
Chris@148 357 ::perror("MatrixFile::getColumnAt: read failed");
Chris@148 358 throw FileReadFailed(m_fileName);
Chris@148 359 }
Chris@148 360
Chris@148 361 return;
Chris@148 362 }
Chris@148 363
Chris@148 364 bool
Chris@148 365 MatrixFile::getFromCache(size_t x, size_t ystart, size_t ycount, void *data)
Chris@148 366 {
Chris@148 367 m_cacheMutex.lock();
Chris@148 368
Chris@148 369 if (!m_cache.data || x < m_cache.x || x >= m_cache.x + m_cache.width) {
Chris@148 370 bool left = (m_cache.data && x < m_cache.x);
Chris@148 371 m_cacheMutex.unlock();
Chris@148 372 primeCache(x, left); // this doesn't take effect until a later callback
Chris@148 373 m_prevX = x;
Chris@148 374 return false;
Chris@148 375 }
Chris@148 376
Chris@148 377 memcpy(data,
Chris@148 378 m_cache.data + m_cellSize * ((x - m_cache.x) * m_height + ystart),
Chris@148 379 ycount * m_cellSize);
Chris@148 380
Chris@148 381 m_cacheMutex.unlock();
Chris@148 382
Chris@148 383 if (m_cache.x > 0 && x < m_prevX && x < m_cache.x + m_cache.width/4) {
Chris@148 384 primeCache(x, true);
Chris@148 385 }
Chris@148 386
Chris@148 387 if (m_cache.x + m_cache.width < m_width &&
Chris@148 388 x > m_prevX &&
Chris@148 389 x > m_cache.x + (m_cache.width * 3) / 4) {
Chris@148 390 primeCache(x, false);
Chris@148 391 }
Chris@148 392
Chris@148 393 m_prevX = x;
Chris@148 394 return true;
Chris@148 395 }
Chris@148 396
Chris@148 397 void
Chris@148 398 MatrixFile::setColumnAt(size_t x, const void *data)
Chris@148 399 {
Chris@148 400 assert(m_mode == ReadWrite);
Chris@148 401
Chris@148 402 #ifdef DEBUG_MATRIX_FILE_READ_SET
Chris@148 403 std::cerr << "MatrixFile::setColumnAt(" << x << ")" << std::endl;
Chris@148 404 #endif
Chris@148 405
Chris@148 406 ssize_t w = 0;
Chris@148 407 bool seekFailed = false;
Chris@148 408
Chris@148 409 m_fdMutex.lock();
Chris@148 410
Chris@148 411 if (seekTo(x, 0)) {
Chris@148 412 w = ::write(m_fd, data, m_height * m_cellSize);
Chris@148 413 } else {
Chris@148 414 seekFailed = true;
Chris@148 415 }
Chris@148 416
Chris@148 417 m_fdMutex.unlock();
Chris@148 418
Chris@148 419 if (!seekFailed && w != ssize_t(m_height * m_cellSize)) {
Chris@148 420 ::perror("WARNING: MatrixFile::setColumnAt: write failed");
Chris@148 421 throw FileOperationFailed(m_fileName, "write");
Chris@148 422 } else if (seekFailed) {
Chris@148 423 throw FileOperationFailed(m_fileName, "seek");
Chris@148 424 } else {
Chris@148 425 QMutexLocker locker(&m_columnBitsetWriteMutex);
Chris@148 426 m_columnBitset->set(x);
Chris@148 427 }
Chris@148 428 }
Chris@148 429
Chris@148 430 void
Chris@148 431 MatrixFile::suspend()
Chris@148 432 {
Chris@148 433 QMutexLocker locker(&m_fdMutex);
Chris@148 434 QMutexLocker locker2(&m_cacheMutex);
Chris@148 435
Chris@148 436 if (m_fd < 0) return; // already suspended
Chris@148 437
Chris@148 438 #ifdef DEBUG_MATRIX_FILE
Chris@148 439 std::cerr << "MatrixFile(" << this << ":" << m_fileName.toStdString() << ")::suspend(): fd was " << m_fd << std::endl;
Chris@148 440 #endif
Chris@148 441
Chris@148 442 if (m_requestToken >= 0) {
Chris@148 443 void *data = 0;
Chris@148 444 FileReadThread::Request request;
Chris@148 445 if (m_readThread->getRequest(m_requestToken, request)) {
Chris@148 446 data = request.data;
Chris@148 447 }
Chris@148 448 m_readThread->cancel(m_requestToken);
Chris@148 449 if (data) free(data);
Chris@148 450 m_requestToken = -1;
Chris@148 451 }
Chris@148 452
Chris@148 453 if (m_cache.data) {
Chris@148 454 free(m_cache.data);
Chris@148 455 m_cache.data = 0;
Chris@148 456 }
Chris@148 457
Chris@148 458 if (m_spareData) {
Chris@148 459 free(m_spareData);
Chris@148 460 m_spareData = 0;
Chris@148 461 }
Chris@148 462
Chris@148 463 if (::close(m_fd) < 0) {
Chris@148 464 ::perror("WARNING: MatrixFile::suspend: close failed");
Chris@148 465 throw FileOperationFailed(m_fileName, "close");
Chris@148 466 }
Chris@148 467
Chris@148 468 m_fd = -1;
Chris@148 469 }
Chris@148 470
Chris@148 471 void
Chris@148 472 MatrixFile::resume()
Chris@148 473 {
Chris@148 474 if (m_fd >= 0) return;
Chris@148 475
Chris@148 476 #ifdef DEBUG_MATRIX_FILE
Chris@148 477 std::cerr << "MatrixFile(" << this << ")::resume()" << std::endl;
Chris@148 478 #endif
Chris@148 479
Chris@148 480 if ((m_fd = ::open(m_fileName.toLocal8Bit(), m_flags, m_fmode)) < 0) {
Chris@148 481 ::perror("Open failed");
Chris@148 482 std::cerr << "ERROR: MatrixFile::resume: "
Chris@148 483 << "Failed to open cache file \""
Chris@148 484 << m_fileName.toStdString() << "\"";
Chris@148 485 if (m_mode == ReadWrite) std::cerr << " for writing";
Chris@148 486 std::cerr << std::endl;
Chris@148 487 throw FailedToOpenFile(m_fileName);
Chris@148 488 }
Chris@148 489
Chris@148 490 std::cerr << "MatrixFile(" << this << ":" << m_fileName.toStdString() << ")::resume(): fd is " << m_fd << std::endl;
Chris@148 491 }
Chris@148 492
Chris@148 493 void
Chris@148 494 MatrixFile::primeCache(size_t x, bool goingLeft)
Chris@148 495 {
Chris@148 496 // Profiler profiler("MatrixFile::primeCache");
Chris@148 497
Chris@148 498 #ifdef DEBUG_MATRIX_FILE_READ_SET
Chris@148 499 std::cerr << "MatrixFile::primeCache(" << x << ", " << goingLeft << ")" << std::endl;
Chris@148 500 #endif
Chris@148 501
Chris@148 502 size_t rx = x;
Chris@148 503 size_t rw = m_defaultCacheWidth;
Chris@148 504
Chris@148 505 size_t left = rw / 3;
Chris@148 506 if (goingLeft) left = (rw * 2) / 3;
Chris@148 507
Chris@148 508 if (rx > left) rx -= left;
Chris@148 509 else rx = 0;
Chris@148 510
Chris@148 511 if (rx + rw > m_width) rw = m_width - rx;
Chris@148 512
Chris@148 513 if (!m_eagerCache) {
Chris@148 514
Chris@148 515 size_t ti = 0;
Chris@148 516
Chris@148 517 for (ti = 0; ti < rw; ++ti) {
Chris@148 518 if (!m_columnBitset->get(rx + ti)) break;
Chris@148 519 }
Chris@148 520
Chris@148 521 #ifdef DEBUG_MATRIX_FILE
Chris@148 522 if (ti < rw) {
Chris@148 523 std::cerr << "eagerCache is false and there's a hole at "
Chris@148 524 << rx + ti << ", reducing rw from " << rw << " to "
Chris@148 525 << ti << std::endl;
Chris@148 526 }
Chris@148 527 #endif
Chris@148 528
Chris@148 529 rw = std::min(rw, ti);
Chris@148 530 if (rw < 10 || rx + rw <= x) return;
Chris@148 531 }
Chris@148 532
Chris@148 533 QMutexLocker locker(&m_cacheMutex);
Chris@148 534
Chris@148 535 FileReadThread::Request request;
Chris@148 536
Chris@148 537 if (m_requestToken >= 0 &&
Chris@148 538 m_readThread->getRequest(m_requestToken, request)) {
Chris@148 539
Chris@148 540 if (x >= m_requestingX &&
Chris@148 541 x < m_requestingX + m_requestingWidth) {
Chris@148 542
Chris@148 543 if (m_readThread->isReady(m_requestToken)) {
Chris@148 544
Chris@148 545 if (!request.successful) {
Chris@148 546 std::cerr << "ERROR: MatrixFile::primeCache: Last request was unsuccessful" << std::endl;
Chris@148 547 throw FileReadFailed(m_fileName);
Chris@148 548 }
Chris@148 549
Chris@148 550 #ifdef DEBUG_MATRIX_FILE_READ_SET
Chris@148 551 std::cerr << "last request is ready! (" << m_requestingX << ", "<< m_requestingWidth << ")" << std::endl;
Chris@148 552 #endif
Chris@148 553
Chris@148 554 m_cache.x = (request.start - m_headerSize) / (m_height * m_cellSize);
Chris@148 555 m_cache.width = request.size / (m_height * m_cellSize);
Chris@148 556
Chris@148 557 #ifdef DEBUG_MATRIX_FILE_READ_SET
Chris@148 558 std::cerr << "received last request: actual size is: " << m_cache.x << ", " << m_cache.width << std::endl;
Chris@148 559 #endif
Chris@148 560
Chris@148 561 if (m_cache.data) {
Chris@148 562 if (m_spareData) free(m_spareData);
Chris@148 563 m_spareData = m_cache.data;
Chris@148 564 }
Chris@148 565 m_cache.data = request.data;
Chris@148 566
Chris@148 567 m_readThread->done(m_requestToken);
Chris@148 568 m_requestToken = -1;
Chris@148 569 }
Chris@148 570
Chris@148 571 // already requested something covering this area; wait for it
Chris@148 572 return;
Chris@148 573 }
Chris@148 574
Chris@148 575 // the current request is no longer of any use
Chris@148 576 m_readThread->cancel(m_requestToken);
Chris@148 577
Chris@148 578 // crude way to avoid leaking the data
Chris@148 579 while (!m_readThread->isCancelled(m_requestToken)) {
Chris@148 580 usleep(10000);
Chris@148 581 }
Chris@148 582
Chris@148 583 #ifdef DEBUG_MATRIX_FILE_READ_SET
Chris@148 584 std::cerr << "cancelled " << m_requestToken << std::endl;
Chris@148 585 #endif
Chris@148 586
Chris@148 587 if (m_spareData) free(m_spareData);
Chris@148 588 m_spareData = request.data;
Chris@148 589 m_readThread->done(m_requestToken);
Chris@148 590
Chris@148 591 m_requestToken = -1;
Chris@148 592 }
Chris@148 593
Chris@148 594 if (m_fd < 0) {
Chris@148 595 m_fdMutex.lock();
Chris@148 596 if (m_fd < 0) resume();
Chris@148 597 m_fdMutex.unlock();
Chris@148 598 }
Chris@148 599
Chris@148 600 request.fd = m_fd;
Chris@148 601 request.mutex = &m_fdMutex;
Chris@148 602 request.start = m_headerSize + rx * m_height * m_cellSize;
Chris@148 603 request.size = rw * m_height * m_cellSize;
Chris@148 604 request.data = (char *)realloc(m_spareData, rw * m_height * m_cellSize);
Chris@148 605 MUNLOCK(request.data, rw * m_height * m_cellSize);
Chris@148 606 m_spareData = 0;
Chris@148 607
Chris@148 608 m_requestingX = rx;
Chris@148 609 m_requestingWidth = rw;
Chris@148 610
Chris@148 611 int token = m_readThread->request(request);
Chris@148 612 #ifdef DEBUG_MATRIX_FILE_READ_SET
Chris@148 613 std::cerr << "MatrixFile::primeCache: request token is "
Chris@148 614 << token << " (x = [" << rx << "], w = [" << rw << "], left = [" << goingLeft << "])" << std::endl;
Chris@148 615 #endif
Chris@148 616 m_requestToken = token;
Chris@148 617 }
Chris@148 618
Chris@148 619 bool
Chris@148 620 MatrixFile::seekTo(size_t x, size_t y)
Chris@148 621 {
Chris@148 622 if (m_fd < 0) resume();
Chris@148 623
Chris@148 624 off_t off = m_headerSize + (x * m_height + y) * m_cellSize;
Chris@148 625
Chris@148 626 if (::lseek(m_fd, off, SEEK_SET) == (off_t)-1) {
Chris@148 627 ::perror("Seek failed");
Chris@148 628 std::cerr << "ERROR: MatrixFile::seekTo(" << x << ", " << y
Chris@148 629 << ") failed" << std::endl;
Chris@148 630 return false;
Chris@148 631 }
Chris@148 632
Chris@148 633 return true;
Chris@148 634 }
Chris@148 635