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00026 #include "read0read.h"
00027
00028 #ifdef UNIV_NONINL
00029 #include "read0read.ic"
00030 #endif
00031
00032 #include "srv0srv.h"
00033 #include "trx0sys.h"
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00140
00143 UNIV_INLINE
00144 read_view_t*
00145 read_view_create_low(
00146
00147 ulint n,
00148 mem_heap_t* heap)
00149 {
00150 read_view_t* view;
00151
00152 view = static_cast<read_view_t *>(mem_heap_alloc(heap, sizeof(read_view_t)));
00153
00154 view->n_trx_ids = n;
00155 view->trx_ids = static_cast<trx_id_t *>(mem_heap_alloc(heap, n * sizeof *view->trx_ids));
00156
00157 return(view);
00158 }
00159
00160
00166 UNIV_INTERN
00167 read_view_t*
00168 read_view_oldest_copy_or_open_new(
00169
00170 trx_id_t cr_trx_id,
00172 mem_heap_t* heap)
00174 {
00175 read_view_t* old_view;
00176 read_view_t* view_copy;
00177 ibool needs_insert = TRUE;
00178 ulint insert_done = 0;
00179 ulint n;
00180 ulint i;
00181
00182 ut_ad(mutex_own(&kernel_mutex));
00183
00184 old_view = UT_LIST_GET_LAST(trx_sys->view_list);
00185
00186 if (old_view == NULL) {
00187
00188 return(read_view_open_now(cr_trx_id, heap));
00189 }
00190
00191 n = old_view->n_trx_ids;
00192
00193 if (old_view->creator_trx_id) {
00194 n++;
00195 } else {
00196 needs_insert = FALSE;
00197 }
00198
00199 view_copy = read_view_create_low(n, heap);
00200
00201
00202
00203
00204 i = 0;
00205 while (i < n) {
00206 if (needs_insert
00207 && (i >= old_view->n_trx_ids
00208 || old_view->creator_trx_id
00209 > read_view_get_nth_trx_id(old_view, i))) {
00210
00211 read_view_set_nth_trx_id(view_copy, i,
00212 old_view->creator_trx_id);
00213 needs_insert = FALSE;
00214 insert_done = 1;
00215 } else {
00216 read_view_set_nth_trx_id(view_copy, i,
00217 read_view_get_nth_trx_id(
00218 old_view,
00219 i - insert_done));
00220 }
00221
00222 i++;
00223 }
00224
00225 view_copy->creator_trx_id = cr_trx_id;
00226
00227 view_copy->low_limit_no = old_view->low_limit_no;
00228 view_copy->low_limit_id = old_view->low_limit_id;
00229
00230
00231 if (n > 0) {
00232
00233 view_copy->up_limit_id = read_view_get_nth_trx_id(
00234 view_copy, n - 1);
00235 } else {
00236 view_copy->up_limit_id = old_view->up_limit_id;
00237 }
00238
00239 UT_LIST_ADD_LAST(view_list, trx_sys->view_list, view_copy);
00240
00241 return(view_copy);
00242 }
00243
00244
00248 UNIV_INTERN
00249 read_view_t*
00250 read_view_open_now(
00251
00252 trx_id_t cr_trx_id,
00254 mem_heap_t* heap)
00256 {
00257 read_view_t* view;
00258 trx_t* trx;
00259 ulint n;
00260
00261 ut_ad(mutex_own(&kernel_mutex));
00262
00263 view = read_view_create_low(UT_LIST_GET_LEN(trx_sys->trx_list), heap);
00264
00265 view->creator_trx_id = cr_trx_id;
00266 view->type = VIEW_NORMAL;
00267 view->undo_no = 0;
00268
00269
00270
00271 view->low_limit_no = trx_sys->max_trx_id;
00272 view->low_limit_id = view->low_limit_no;
00273
00274 n = 0;
00275 trx = UT_LIST_GET_FIRST(trx_sys->trx_list);
00276
00277
00278
00279 while (trx) {
00280 if (trx->id != cr_trx_id
00281 && (trx->conc_state == TRX_ACTIVE
00282 || trx->conc_state == TRX_PREPARED)) {
00283
00284 read_view_set_nth_trx_id(view, n, trx->id);
00285
00286 n++;
00287
00288
00289
00290
00291
00292
00293
00294 if (view->low_limit_no > trx->no) {
00295
00296 view->low_limit_no = trx->no;
00297 }
00298 }
00299
00300 trx = UT_LIST_GET_NEXT(trx_list, trx);
00301 }
00302
00303 view->n_trx_ids = n;
00304
00305 if (n > 0) {
00306
00307 view->up_limit_id = read_view_get_nth_trx_id(view, n - 1);
00308 } else {
00309 view->up_limit_id = view->low_limit_id;
00310 }
00311
00312
00313 UT_LIST_ADD_FIRST(view_list, trx_sys->view_list, view);
00314
00315 return(view);
00316 }
00317
00318
00320 UNIV_INTERN
00321 void
00322 read_view_close(
00323
00324 read_view_t* view)
00325 {
00326 ut_ad(mutex_own(&kernel_mutex));
00327
00328 UT_LIST_REMOVE(view_list, trx_sys->view_list, view);
00329 }
00330
00331
00334 UNIV_INTERN
00335 void
00336 read_view_close_for_mysql(
00337
00338 trx_t* trx)
00339 {
00340 ut_a(trx->global_read_view);
00341
00342 mutex_enter(&kernel_mutex);
00343
00344 read_view_close(trx->global_read_view);
00345
00346 mem_heap_empty(trx->global_read_view_heap);
00347
00348 trx->read_view = NULL;
00349 trx->global_read_view = NULL;
00350
00351 mutex_exit(&kernel_mutex);
00352 }
00353
00354
00356 UNIV_INTERN
00357 void
00358 read_view_print(
00359
00360 const read_view_t* view)
00361 {
00362 ulint n_ids;
00363 ulint i;
00364
00365 if (view->type == VIEW_HIGH_GRANULARITY) {
00366 fprintf(stderr,
00367 "High-granularity read view undo_n:o %llu\n",
00368 (ullint) view->undo_no);
00369 } else {
00370 fprintf(stderr, "Normal read view\n");
00371 }
00372
00373 fprintf(stderr, "Read view low limit trx n:o " TRX_ID_FMT "\n",
00374 view->low_limit_no);
00375
00376 fprintf(stderr, "Read view up limit trx id " TRX_ID_FMT "\n",
00377 view->up_limit_id);
00378
00379 fprintf(stderr, "Read view low limit trx id " TRX_ID_FMT "\n",
00380 view->low_limit_id);
00381
00382 fprintf(stderr, "Read view individually stored trx ids:\n");
00383
00384 n_ids = view->n_trx_ids;
00385
00386 for (i = 0; i < n_ids; i++) {
00387 fprintf(stderr, "Read view trx id " TRX_ID_FMT "\n",
00388 read_view_get_nth_trx_id(view, i));
00389 }
00390 }
00391
00392
00397 UNIV_INTERN
00398 cursor_view_t*
00399 read_cursor_view_create_for_mysql(
00400
00401 trx_t* cr_trx)
00402 {
00403 cursor_view_t* curview;
00404 read_view_t* view;
00405 mem_heap_t* heap;
00406 trx_t* trx;
00407 ulint n;
00408
00409 ut_a(cr_trx);
00410
00411
00412
00413
00414 heap = mem_heap_create(512);
00415
00416 curview = (cursor_view_t*) mem_heap_alloc(heap, sizeof(cursor_view_t));
00417 curview->heap = heap;
00418
00419 mutex_enter(&kernel_mutex);
00420
00421 curview->read_view = read_view_create_low(
00422 UT_LIST_GET_LEN(trx_sys->trx_list), curview->heap);
00423
00424 view = curview->read_view;
00425 view->creator_trx_id = cr_trx->id;
00426 view->type = VIEW_HIGH_GRANULARITY;
00427 view->undo_no = cr_trx->undo_no;
00428
00429
00430
00431 view->low_limit_no = trx_sys->max_trx_id;
00432 view->low_limit_id = view->low_limit_no;
00433
00434 n = 0;
00435 trx = UT_LIST_GET_FIRST(trx_sys->trx_list);
00436
00437
00438
00439 while (trx) {
00440
00441 if (trx->conc_state == TRX_ACTIVE
00442 || trx->conc_state == TRX_PREPARED) {
00443
00444 read_view_set_nth_trx_id(view, n, trx->id);
00445
00446 n++;
00447
00448
00449
00450
00451
00452
00453
00454 if (view->low_limit_no > trx->no) {
00455
00456 view->low_limit_no = trx->no;
00457 }
00458 }
00459
00460 trx = UT_LIST_GET_NEXT(trx_list, trx);
00461 }
00462
00463 view->n_trx_ids = n;
00464
00465 if (n > 0) {
00466
00467 view->up_limit_id = read_view_get_nth_trx_id(view, n - 1);
00468 } else {
00469 view->up_limit_id = view->low_limit_id;
00470 }
00471
00472 UT_LIST_ADD_FIRST(view_list, trx_sys->view_list, view);
00473
00474 mutex_exit(&kernel_mutex);
00475
00476 return(curview);
00477 }
00478
00479
00482 UNIV_INTERN
00483 void
00484 read_cursor_view_close_for_mysql(
00485
00486 trx_t* trx,
00487 cursor_view_t* curview)
00488 {
00489 ut_a(curview);
00490 ut_a(curview->read_view);
00491 ut_a(curview->heap);
00492
00493
00494
00495
00496 mutex_enter(&kernel_mutex);
00497
00498 read_view_close(curview->read_view);
00499 trx->read_view = trx->global_read_view;
00500
00501 mutex_exit(&kernel_mutex);
00502
00503 mem_heap_free(curview->heap);
00504 }
00505
00506
00510 UNIV_INTERN
00511 void
00512 read_cursor_set_for_mysql(
00513
00514 trx_t* trx,
00515 cursor_view_t* curview)
00516 {
00517 ut_a(trx);
00518
00519 mutex_enter(&kernel_mutex);
00520
00521 if (UNIV_LIKELY(curview != NULL)) {
00522 trx->read_view = curview->read_view;
00523 } else {
00524 trx->read_view = trx->global_read_view;
00525 }
00526
00527 mutex_exit(&kernel_mutex);
00528 }