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Overview
Comment: | Modify pcache.c to work with OMIT_WSD. (CVS 5659) |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
44def90d1bd4e37ab162e16f83e23d32 |
User & Date: | danielk1977 2008-09-02 09:38:07.000 |
Context
2008-09-02
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10:22 | Change some more global variables to work with OMIT_WSD. (CVS 5660) (check-in: 46acaf58e1 user: danielk1977 tags: trunk) | |
09:38 | Modify pcache.c to work with OMIT_WSD. (CVS 5659) (check-in: 44def90d1b user: danielk1977 tags: trunk) | |
00:52 | Continuing work on adding full support for the SQLITE_OMIT_WSD compile-time option. (CVS 5658) (check-in: ef26ea5c46 user: drh tags: trunk) | |
Changes
Changes to src/btree.c.
1 2 3 4 5 6 7 8 9 10 11 | /* ** 2004 April 6 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* | | | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | /* ** 2004 April 6 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** $Id: btree.c,v 1.507 2008/09/02 09:38:07 danielk1977 Exp $ ** ** This file implements a external (disk-based) database using BTrees. ** See the header comment on "btreeInt.h" for additional information. ** Including a description of file format and an overview of operation. */ #include "btreeInt.h" |
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58 59 60 61 62 63 64 | ** Enable or disable the shared pager and schema features. ** ** This routine has no effect on existing database connections. ** The shared cache setting effects only future calls to ** sqlite3_open(), sqlite3_open16(), or sqlite3_open_v2(). */ int sqlite3_enable_shared_cache(int enable){ | | | 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 | ** Enable or disable the shared pager and schema features. ** ** This routine has no effect on existing database connections. ** The shared cache setting effects only future calls to ** sqlite3_open(), sqlite3_open16(), or sqlite3_open_v2(). */ int sqlite3_enable_shared_cache(int enable){ GLOBAL(int, sqlite3SharedCacheEnabled) = enable; return SQLITE_OK; } #endif /* ** Forward declaration |
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Changes to src/main.c.
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10 11 12 13 14 15 16 | ** ************************************************************************* ** Main file for the SQLite library. The routines in this file ** implement the programmer interface to the library. Routines in ** other files are for internal use by SQLite and should not be ** accessed by users of the library. ** | | | 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | ** ************************************************************************* ** Main file for the SQLite library. The routines in this file ** implement the programmer interface to the library. Routines in ** other files are for internal use by SQLite and should not be ** accessed by users of the library. ** ** $Id: main.c,v 1.496 2008/09/02 09:38:07 danielk1977 Exp $ */ #include "sqliteInt.h" #include <ctype.h> #ifdef SQLITE_ENABLE_FTS3 # include "fts3.h" #endif |
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156 157 158 159 160 161 162 | FuncDefHash *pHash = &GLOBAL(FuncDefHash, sqlite3GlobalFunctions); GLOBAL(int, inProgress) = 1; memset(pHash, 0, sizeof(sqlite3GlobalFunctions)); sqlite3RegisterGlobalFunctions(); rc = sqlite3_os_init(); if( rc==SQLITE_OK ){ rc = sqlite3PcacheInitialize(); | | | | 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 | FuncDefHash *pHash = &GLOBAL(FuncDefHash, sqlite3GlobalFunctions); GLOBAL(int, inProgress) = 1; memset(pHash, 0, sizeof(sqlite3GlobalFunctions)); sqlite3RegisterGlobalFunctions(); rc = sqlite3_os_init(); if( rc==SQLITE_OK ){ rc = sqlite3PcacheInitialize(); sqlite3PCacheBufferSetup( sqlite3GlobalConfig.pPage, sqlite3GlobalConfig.szPage, sqlite3GlobalConfig.nPage); } GLOBAL(int, inProgress) = 0; sqlite3GlobalConfig.isInit = (rc==SQLITE_OK ? 1 : 0); } sqlite3_mutex_leave(sqlite3GlobalConfig.pInitMutex); /* Go back under the static mutex and clean up the recursive |
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Changes to src/pcache.c.
1 2 3 4 5 6 7 8 9 10 11 12 13 | /* ** 2008 August 05 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file implements that page cache. ** | | | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | /* ** 2008 August 05 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file implements that page cache. ** ** @(#) $Id: pcache.c,v 1.26 2008/09/02 09:38:07 danielk1977 Exp $ */ #include "sqliteInt.h" /* ** A complete page cache is an instance of this structure. ** ** A cache may only be deleted by its owner and while holding the |
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64 65 66 67 68 69 70 | struct PgFreeslot { PgFreeslot *pNext; /* Next free slot */ }; /* ** Global data for the page cache. */ | | > > > > > > > | | | | 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 | struct PgFreeslot { PgFreeslot *pNext; /* Next free slot */ }; /* ** Global data for the page cache. */ static SQLITE_WSD struct PCacheGlobal { int isInit; /* True when initialized */ sqlite3_mutex *mutex; /* static mutex MUTEX_STATIC_LRU */ int nMaxPage; /* Sum of nMaxPage for purgeable caches */ int nMinPage; /* Sum of nMinPage for purgeable caches */ int nCurrentPage; /* Number of purgeable pages allocated */ PgHdr *pLruHead, *pLruTail; /* LRU list of unused clean pgs */ /* Variables related to SQLITE_CONFIG_PAGECACHE settings. */ int szSlot; /* Size of each free slot */ void *pStart, *pEnd; /* Bounds of pagecache malloc range */ PgFreeslot *pFree; /* Free page blocks */ } pcache = {0}; /* ** All code in this file should access the global pcache structure via the ** alias "pcache_g". This ensures that the WSD emulation is used when ** compiling for systems that do not support real WSD. */ #define pcache_g (GLOBAL(struct PCacheGlobal, pcache)) /* ** All global variables used by this module (all of which are grouped ** together in global structure "pcache" above) are protected by the static ** SQLITE_MUTEX_STATIC_LRU mutex. A pointer to this mutex is stored in ** variable "pcache.mutex". ** ** Some elements of the PCache and PgHdr structures are protected by the ** SQLITE_MUTEX_STATUS_LRU mutex and other are not. The protected ** elements are grouped at the end of the structures and are clearly ** marked. ** ** Use the following macros must surround all access (read or write) ** of protected elements. The mutex is not recursive and may not be ** entered more than once. The pcacheMutexHeld() macro should only be ** used within an assert() to verify that the mutex is being held. */ #define pcacheEnterMutex() sqlite3_mutex_enter(pcache_g.mutex) #define pcacheExitMutex() sqlite3_mutex_leave(pcache_g.mutex) #define pcacheMutexHeld() sqlite3_mutex_held(pcache_g.mutex) /* ** Some of the assert() macros in this code are too expensive to run ** even during normal debugging. Use them only rarely on long-running ** tests. Enable the expensive asserts using the ** -DSQLITE_ENABLE_EXPENSIVE_ASSERT=1 compile-time option. */ |
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313 314 315 316 317 318 319 | } } /* ** Remove a page from the global LRU list */ static void pcacheRemoveFromLruList(PgHdr *pPage){ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 | } } /* ** Remove a page from the global LRU list */ static void pcacheRemoveFromLruList(PgHdr *pPage){ assert( sqlite3_mutex_held(pcache_g.mutex) ); assert( (pPage->flags&PGHDR_DIRTY)==0 ); if( pPage->pCache->bPurgeable==0 ) return; if( pPage->pNextLru ){ assert( pcache_g.pLruTail!=pPage ); pPage->pNextLru->pPrevLru = pPage->pPrevLru; }else{ assert( pcache_g.pLruTail==pPage ); pcache_g.pLruTail = pPage->pPrevLru; } if( pPage->pPrevLru ){ assert( pcache_g.pLruHead!=pPage ); pPage->pPrevLru->pNextLru = pPage->pNextLru; }else{ assert( pcache_g.pLruHead==pPage ); pcache_g.pLruHead = pPage->pNextLru; } } /* ** Add a page to the global LRU list. The page is normally added ** to the front of the list so that it will be the last page recycled. ** However, if the PGHDR_REUSE_UNLIKELY bit is set, the page is added ** to the end of the LRU list so that it will be the next to be recycled. */ static void pcacheAddToLruList(PgHdr *pPage){ assert( sqlite3_mutex_held(pcache_g.mutex) ); assert( (pPage->flags&PGHDR_DIRTY)==0 ); if( pPage->pCache->bPurgeable==0 ) return; if( pcache_g.pLruTail && (pPage->flags & PGHDR_REUSE_UNLIKELY)!=0 ){ /* If reuse is unlikely. Put the page at the end of the LRU list ** where it will be recycled sooner rather than later. */ assert( pcache_g.pLruHead ); pPage->pNextLru = 0; pPage->pPrevLru = pcache_g.pLruTail; pcache_g.pLruTail->pNextLru = pPage; pcache_g.pLruTail = pPage; pPage->flags &= ~PGHDR_REUSE_UNLIKELY; }else{ /* If reuse is possible. the page goes at the beginning of the LRU ** list so that it will be the last to be recycled. */ if( pcache_g.pLruHead ){ pcache_g.pLruHead->pPrevLru = pPage; } pPage->pNextLru = pcache_g.pLruHead; pcache_g.pLruHead = pPage; pPage->pPrevLru = 0; if( pcache_g.pLruTail==0 ){ pcache_g.pLruTail = pPage; } } } /*********************************************** Memory Allocation *********** ** ** Initialize the page cache memory pool. ** ** This must be called at start-time when no page cache lines are ** checked out. This function is not threadsafe. */ void sqlite3PCacheBufferSetup(void *pBuf, int sz, int n){ PgFreeslot *p; sz &= ~7; pcache_g.szSlot = sz; pcache_g.pStart = pBuf; pcache_g.pFree = 0; while( n-- ){ p = (PgFreeslot*)pBuf; p->pNext = pcache_g.pFree; pcache_g.pFree = p; pBuf = (void*)&((char*)pBuf)[sz]; } pcache_g.pEnd = pBuf; } /* ** Allocate a page cache line. Look in the page cache memory pool first ** and use an element from it first if available. If nothing is available ** in the page cache memory pool, go to the general purpose memory allocator. */ void *pcacheMalloc(int sz, PCache *pCache){ assert( sqlite3_mutex_held(pcache_g.mutex) ); if( sz<=pcache_g.szSlot && pcache_g.pFree ){ PgFreeslot *p = pcache_g.pFree; pcache_g.pFree = p->pNext; sqlite3StatusSet(SQLITE_STATUS_PAGECACHE_SIZE, sz); sqlite3StatusAdd(SQLITE_STATUS_PAGECACHE_USED, 1); return (void*)p; }else{ void *p; /* Allocate a new buffer using sqlite3Malloc. Before doing so, exit the |
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435 436 437 438 439 440 441 | return p; } /* ** Release a pager memory allocation */ void pcacheFree(void *p){ | | | | | | | | | | | | | | 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 | return p; } /* ** Release a pager memory allocation */ void pcacheFree(void *p){ assert( sqlite3_mutex_held(pcache_g.mutex) ); if( p==0 ) return; if( p>=pcache_g.pStart && p<pcache_g.pEnd ){ PgFreeslot *pSlot; sqlite3StatusAdd(SQLITE_STATUS_PAGECACHE_USED, -1); pSlot = (PgFreeslot*)p; pSlot->pNext = pcache_g.pFree; pcache_g.pFree = pSlot; }else{ int iSize = sqlite3MallocSize(p); sqlite3StatusAdd(SQLITE_STATUS_PAGECACHE_OVERFLOW, -iSize); sqlite3_free(p); } } void sqlite3PageFree(void *p){ pcacheEnterMutex(); pcacheFree(p); pcacheExitMutex(); } /* ** Allocate a new page. */ static PgHdr *pcachePageAlloc(PCache *pCache){ PgHdr *p; int sz = sizeof(*p) + pCache->szPage + pCache->szExtra; assert( sqlite3_mutex_held(pcache_g.mutex) ); p = pcacheMalloc(sz, pCache); if( p==0 ) return 0; memset(p, 0, sizeof(PgHdr)); p->pData = (void*)&p[1]; p->pExtra = (void*)&((char*)p->pData)[pCache->szPage]; if( pCache->bPurgeable ){ pcache_g.nCurrentPage++; } return p; } /* ** Deallocate a page */ static void pcachePageFree(PgHdr *p){ assert( sqlite3_mutex_held(pcache_g.mutex) ); if( p->pCache->bPurgeable ){ pcache_g.nCurrentPage--; } pcacheFree(p->apSave[0]); pcacheFree(p->apSave[1]); pcacheFree(p); } #ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT /* ** Return the number of bytes that will be returned to the heap when ** the argument is passed to pcachePageFree(). */ static int pcachePageSize(PgHdr *p){ assert( sqlite3_mutex_held(pcache_g.mutex) ); assert( !pcache_g.pStart ); assert( p->apSave[0]==0 ); assert( p->apSave[1]==0 ); assert( p && p->pCache ); return sqlite3MallocSize(p); } #endif /* ** Attempt to 'recycle' a page from the global LRU list. Only clean, ** unreferenced pages from purgeable caches are eligible for recycling. ** ** This function removes page pcache.pLruTail from the global LRU list, ** and from the hash-table and PCache.pClean list of the owner pcache. ** There should be no other references to the page. ** ** A pointer to the recycled page is returned, or NULL if no page is ** eligible for recycling. */ static PgHdr *pcacheRecyclePage(){ PgHdr *p = 0; assert( sqlite3_mutex_held(pcache_g.mutex) ); if( (p=pcache_g.pLruTail) ){ assert( (p->flags&PGHDR_DIRTY)==0 ); pcacheRemoveFromLruList(p); pcacheRemoveFromHash(p); pcacheRemoveFromList(&p->pCache->pClean, p); } return p; |
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539 540 541 542 543 544 545 | */ static int pcacheRecycleOrAlloc(PCache *pCache, PgHdr **ppPage){ PgHdr *p = 0; int szPage = pCache->szPage; int szExtra = pCache->szExtra; | | | | | 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 | */ static int pcacheRecycleOrAlloc(PCache *pCache, PgHdr **ppPage){ PgHdr *p = 0; int szPage = pCache->szPage; int szExtra = pCache->szExtra; assert( pcache_g.isInit ); assert( sqlite3_mutex_held(pcache_g.mutex) ); *ppPage = 0; /* If we have reached the limit for pinned/dirty pages, and there is at ** least one dirty page, invoke the xStress callback to cause a page to ** become clean. */ expensive_assert( pCache->nPinned==pcachePinnedCount(pCache) ); expensive_assert( pcacheCheckSynced(pCache) ); if( pCache->xStress && pCache->pDirty && pCache->nPinned>=(pcache_g.nMaxPage+pCache->nMin-pcache_g.nMinPage) ){ PgHdr *pPg; assert(pCache->pDirtyTail); for(pPg=pCache->pSynced; pPg && (pPg->nRef || (pPg->flags&PGHDR_NEED_SYNC)); pPg=pPg->pPrev |
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576 577 578 579 580 581 582 | if( rc!=SQLITE_OK && rc!=SQLITE_BUSY ){ return rc; } } } /* If the global page limit has been reached, try to recycle a page. */ | | | 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 | if( rc!=SQLITE_OK && rc!=SQLITE_BUSY ){ return rc; } } } /* If the global page limit has been reached, try to recycle a page. */ if( pCache->bPurgeable && pcache_g.nCurrentPage>=pcache_g.nMaxPage ){ p = pcacheRecyclePage(); } /* If a page has been recycled but it is the wrong size, free it. */ if( p && (p->pCache->szPage!=szPage || p->pCache->szPage!=szExtra) ){ pcachePageFree(p); p = 0; |
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600 601 602 603 604 605 606 | /*************************************************** General Interfaces ****** ** ** Initialize and shutdown the page cache subsystem. Neither of these ** functions are threadsafe. */ int sqlite3PcacheInitialize(void){ | | | | | | | | | | 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 | /*************************************************** General Interfaces ****** ** ** Initialize and shutdown the page cache subsystem. Neither of these ** functions are threadsafe. */ int sqlite3PcacheInitialize(void){ assert( pcache_g.isInit==0 ); memset(&pcache_g, 0, sizeof(pcache)); if( sqlite3GlobalConfig.bCoreMutex ){ /* No need to check the return value of sqlite3_mutex_alloc(). ** Allocating a static mutex cannot fail. */ pcache_g.mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_STATIC_LRU); } pcache_g.isInit = 1; return SQLITE_OK; } void sqlite3PcacheShutdown(void){ memset(&pcache_g, 0, sizeof(pcache)); } /* ** Return the size in bytes of a PCache object. */ int sqlite3PcacheSize(void){ return sizeof(PCache); } /* ** Create a new PCache object. Storage space to hold the object ** has already been allocated and is passed in as the p pointer. */ void sqlite3PcacheOpen( int szPage, /* Size of every page */ int szExtra, /* Extra space associated with each page */ int bPurgeable, /* True if pages are on backing store */ void (*xDestroy)(PgHdr*), /* Called to destroy a page */ int (*xStress)(void*,PgHdr*),/* Call to try to make pages clean */ void *pStress, /* Argument to xStress */ PCache *p /* Preallocated space for the PCache */ ){ assert( pcache_g.isInit ); memset(p, 0, sizeof(PCache)); p->szPage = szPage; p->szExtra = szExtra; p->bPurgeable = bPurgeable; p->xDestroy = xDestroy; p->xStress = xStress; p->pStress = pStress; p->nMax = 100; p->nMin = 10; pcacheEnterMutex(); if( bPurgeable ){ pcache_g.nMaxPage += p->nMax; pcache_g.nMinPage += p->nMin; } pcacheExitMutex(); } /* ** Change the page size for PCache object. This can only happen |
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674 675 676 677 678 679 680 | Pgno pgno, /* Page number to obtain */ int createFlag, /* If true, create page if it does not exist already */ PgHdr **ppPage /* Write the page here */ ){ int rc = SQLITE_OK; PgHdr *pPage = 0; | | | 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 | Pgno pgno, /* Page number to obtain */ int createFlag, /* If true, create page if it does not exist already */ PgHdr **ppPage /* Write the page here */ ){ int rc = SQLITE_OK; PgHdr *pPage = 0; assert( pcache_g.isInit ); assert( pCache!=0 ); assert( pgno>0 ); expensive_assert( pCache->nPinned==pcachePinnedCount(pCache) ); pcacheEnterMutex(); /* Search the hash table for the requested page. Exit early if it is found. */ |
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744 745 746 747 748 749 750 | if( p->pCache->xDestroy ){ p->pCache->xDestroy(p); } pCache->nRef--; if( (p->flags&PGHDR_DIRTY)==0 ){ pCache->nPinned--; pcacheEnterMutex(); | | | 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 | if( p->pCache->xDestroy ){ p->pCache->xDestroy(p); } pCache->nRef--; if( (p->flags&PGHDR_DIRTY)==0 ){ pCache->nPinned--; pcacheEnterMutex(); if( pcache_g.nCurrentPage>pcache_g.nMaxPage ){ pcacheRemoveFromList(&pCache->pClean, p); pcacheRemoveFromHash(p); pcachePageFree(p); }else{ pcacheAddToLruList(p); } pcacheExitMutex(); |
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878 879 880 881 882 883 884 | } /* ** Remove all content from a page cache */ void pcacheClear(PCache *pCache){ PgHdr *p, *pNext; | | | 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 | } /* ** Remove all content from a page cache */ void pcacheClear(PCache *pCache){ PgHdr *p, *pNext; assert( sqlite3_mutex_held(pcache_g.mutex) ); for(p=pCache->pClean; p; p=pNext){ pNext = p->pNext; pcacheRemoveFromLruList(p); pcachePageFree(p); } for(p=pCache->pDirty; p; p=pNext){ pNext = p->pNext; |
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938 939 940 941 942 943 944 | /* ** If there are currently more than pcache.nMaxPage pages allocated, try ** to recycle pages to reduce the number allocated to pcache.nMaxPage. */ static void pcacheEnforceMaxPage(){ PgHdr *p; | | | | | | 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 | /* ** If there are currently more than pcache.nMaxPage pages allocated, try ** to recycle pages to reduce the number allocated to pcache.nMaxPage. */ static void pcacheEnforceMaxPage(){ PgHdr *p; assert( sqlite3_mutex_held(pcache_g.mutex) ); while( pcache_g.nCurrentPage>pcache_g.nMaxPage && (p = pcacheRecyclePage()) ){ pcachePageFree(p); } } /* ** Close a cache. */ void sqlite3PcacheClose(PCache *pCache){ pcacheEnterMutex(); /* Free all the pages used by this pager and remove them from the LRU list. */ pcacheClear(pCache); if( pCache->bPurgeable ){ pcache_g.nMaxPage -= pCache->nMax; pcache_g.nMinPage -= pCache->nMin; pcacheEnforceMaxPage(); } sqlite3_free(pCache->apHash); pcacheExitMutex(); } /* |
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1204 1205 1206 1207 1208 1209 1210 | */ void sqlite3PcacheSetCachesize(PCache *pCache, int mxPage){ if( mxPage<10 ){ mxPage = 10; } if( pCache->bPurgeable ){ pcacheEnterMutex(); | | | | | 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 | */ void sqlite3PcacheSetCachesize(PCache *pCache, int mxPage){ if( mxPage<10 ){ mxPage = 10; } if( pCache->bPurgeable ){ pcacheEnterMutex(); pcache_g.nMaxPage -= pCache->nMax; pcache_g.nMaxPage += mxPage; pcacheEnforceMaxPage(); pcacheExitMutex(); } pCache->nMax = mxPage; } #ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT /* ** This function is called to free superfluous dynamically allocated memory ** held by the pager system. Memory in use by any SQLite pager allocated ** by the current thread may be sqlite3_free()ed. ** ** nReq is the number of bytes of memory required. Once this much has ** been released, the function returns. The return value is the total number ** of bytes of memory released. */ int sqlite3PcacheReleaseMemory(int nReq){ int nFree = 0; if( pcache_g.pStart==0 ){ PgHdr *p; pcacheEnterMutex(); while( (nReq<0 || nFree<nReq) && (p=pcacheRecyclePage()) ){ nFree += pcachePageSize(p); pcachePageFree(p); } pcacheExitMutex(); |
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1246 1247 1248 1249 1250 1251 1252 | int *pnCurrent, int *pnMax, int *pnMin, int *pnRecyclable ){ PgHdr *p; int nRecyclable = 0; | | | | | | 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 | int *pnCurrent, int *pnMax, int *pnMin, int *pnRecyclable ){ PgHdr *p; int nRecyclable = 0; for(p=pcache_g.pLruHead; p; p=p->pNextLru){ nRecyclable++; } *pnCurrent = pcache_g.nCurrentPage; *pnMax = pcache_g.nMaxPage; *pnMin = pcache_g.nMinPage; *pnRecyclable = nRecyclable; } #endif |