diff options
Diffstat (limited to 'src/pcache1.c')
| -rw-r--r-- | src/pcache1.c | 98 |
1 files changed, 49 insertions, 49 deletions
diff --git a/src/pcache1.c b/src/pcache1.c index adbe95395..1591f014c 100644 --- a/src/pcache1.c +++ b/src/pcache1.c @@ -64,14 +64,14 @@ ** ** The third case is a chunk of heap memory (defaulting to 100 pages worth) ** that is allocated when the page cache is created. The size of the local -** bulk allocation can be adjusted using +** bulk allocation can be adjusted using ** ** sqlite3_config(SQLITE_CONFIG_PAGECACHE, (void*)0, 0, N). ** ** If N is positive, then N pages worth of memory are allocated using a single ** sqlite3Malloc() call and that memory is used for the first N pages allocated. ** Or if N is negative, then -1024*N bytes of memory are allocated and used -** for as many pages as can be accomodated. +** for as many pages as can be accommodated. ** ** Only one of (2) or (3) can be used. Once the memory available to (2) or ** (3) is exhausted, subsequent allocations fail over to the general-purpose @@ -89,7 +89,7 @@ typedef struct PgFreeslot PgFreeslot; typedef struct PGroup PGroup; /* -** Each cache entry is represented by an instance of the following +** Each cache entry is represented by an instance of the following ** structure. A buffer of PgHdr1.pCache->szPage bytes is allocated ** directly before this structure and is used to cache the page content. ** @@ -100,12 +100,12 @@ typedef struct PGroup PGroup; ** overrun area, so that overreads are harmless. ** ** Variables isBulkLocal and isAnchor were once type "u8". That works, -** but causes a 2-byte gap in the structure for most architectures (since +** but causes a 2-byte gap in the structure for most architectures (since ** pointers must be either 4 or 8-byte aligned). As this structure is located ** in memory directly after the associated page data, if the database is -** corrupt, code at the b-tree layer may overread the page buffer and +** corrupt, code at the b-tree layer may overread the page buffer and ** read part of this structure before the corruption is detected. This -** can cause a valgrind error if the unitialized gap is accessed. Using u16 +** can cause a valgrind error if the uninitialized gap is accessed. Using u16 ** ensures there is no such gap, and therefore no bytes of uninitialized ** memory in the structure. ** @@ -133,7 +133,7 @@ struct PgHdr1 { #define PAGE_IS_PINNED(p) ((p)->pLruNext==0) #define PAGE_IS_UNPINNED(p) ((p)->pLruNext!=0) -/* Each page cache (or PCache) belongs to a PGroup. A PGroup is a set +/* Each page cache (or PCache) belongs to a PGroup. A PGroup is a set ** of one or more PCaches that are able to recycle each other's unpinned ** pages when they are under memory pressure. A PGroup is an instance of ** the following object. @@ -169,13 +169,13 @@ struct PGroup { ** temporary or transient database) has a single page cache which ** is an instance of this object. ** -** Pointers to structures of this type are cast and returned as +** Pointers to structures of this type are cast and returned as ** opaque sqlite3_pcache* handles. */ struct PCache1 { /* Cache configuration parameters. Page size (szPage) and the purgeable ** flag (bPurgeable) and the pnPurgeable pointer are all set when the - ** cache is created and are never changed thereafter. nMax may be + ** cache is created and are never changed thereafter. nMax may be ** modified at any time by a call to the pcache1Cachesize() method. ** The PGroup mutex must be held when accessing nMax. */ @@ -223,7 +223,7 @@ static SQLITE_WSD struct PCacheGlobal { */ int isInit; /* True if initialized */ int separateCache; /* Use a new PGroup for each PCache */ - int nInitPage; /* Initial bulk allocation size */ + int nInitPage; /* Initial bulk allocation size */ int szSlot; /* Size of each free slot */ int nSlot; /* The number of pcache slots */ int nReserve; /* Try to keep nFreeSlot above this */ @@ -264,7 +264,7 @@ static SQLITE_WSD struct PCacheGlobal { /* -** This function is called during initialization if a static buffer is +** This function is called during initialization if a static buffer is ** supplied to use for the page-cache by passing the SQLITE_CONFIG_PAGECACHE ** verb to sqlite3_config(). Parameter pBuf points to an allocation large ** enough to contain 'n' buffers of 'sz' bytes each. @@ -334,8 +334,8 @@ static int pcache1InitBulk(PCache1 *pCache){ /* ** Malloc function used within this file to allocate space from the buffer -** configured using sqlite3_config(SQLITE_CONFIG_PAGECACHE) option. If no -** such buffer exists or there is no space left in it, this function falls +** configured using sqlite3_config(SQLITE_CONFIG_PAGECACHE) option. If no +** such buffer exists or there is no space left in it, this function falls ** back to sqlite3Malloc(). ** ** Multiple threads can run this routine at the same time. Global variables @@ -442,7 +442,7 @@ static PgHdr1 *pcache1AllocPage(PCache1 *pCache, int benignMalloc){ }else{ #ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT /* The group mutex must be released before pcache1Alloc() is called. This - ** is because it might call sqlite3_release_memory(), which assumes that + ** is because it might call sqlite3_release_memory(), which assumes that ** this mutex is not held. */ assert( pcache1.separateCache==0 ); assert( pCache->pGroup==&pcache1.grp ); @@ -569,7 +569,7 @@ static void pcache1ResizeHash(PCache1 *p){ } /* -** This function is used internally to remove the page pPage from the +** This function is used internally to remove the page pPage from the ** PGroup LRU list, if is part of it. If pPage is not part of the PGroup ** LRU list, then this function is a no-op. ** @@ -594,7 +594,7 @@ static PgHdr1 *pcache1PinPage(PgHdr1 *pPage){ /* -** Remove the page supplied as an argument from the hash table +** Remove the page supplied as an argument from the hash table ** (PCache1.apHash structure) that it is currently stored in. ** Also free the page if freePage is true. ** @@ -637,8 +637,8 @@ static void pcache1EnforceMaxPage(PCache1 *pCache){ } /* -** Discard all pages from cache pCache with a page number (key value) -** greater than or equal to iLimit. Any pinned pages that meet this +** Discard all pages from cache pCache with a page number (key value) +** greater than or equal to iLimit. Any pinned pages that meet this ** criteria are unpinned before they are discarded. ** ** The PCache mutex must be held when this function is called. @@ -670,7 +670,7 @@ static void pcache1TruncateUnsafe( PgHdr1 **pp; PgHdr1 *pPage; assert( h<pCache->nHash ); - pp = &pCache->apHash[h]; + pp = &pCache->apHash[h]; while( (pPage = *pp)!=0 ){ if( pPage->iKey>=iLimit ){ pCache->nPage--; @@ -709,7 +709,7 @@ static int pcache1Init(void *NotUsed){ ** ** * Use a unified cache in single-threaded applications that have ** configured a start-time buffer for use as page-cache memory using - ** sqlite3_config(SQLITE_CONFIG_PAGECACHE, pBuf, sz, N) with non-NULL + ** sqlite3_config(SQLITE_CONFIG_PAGECACHE, pBuf, sz, N) with non-NULL ** pBuf argument. ** ** * Otherwise use separate caches (mode-1) @@ -744,7 +744,7 @@ static int pcache1Init(void *NotUsed){ /* ** Implementation of the sqlite3_pcache.xShutdown method. -** Note that the static mutex allocated in xInit does +** Note that the static mutex allocated in xInit does ** not need to be freed. */ static void pcache1Shutdown(void *NotUsed){ @@ -807,7 +807,7 @@ static sqlite3_pcache *pcache1Create(int szPage, int szExtra, int bPurgeable){ } /* -** Implementation of the sqlite3_pcache.xCachesize method. +** Implementation of the sqlite3_pcache.xCachesize method. ** ** Configure the cache_size limit for a cache. */ @@ -832,7 +832,7 @@ static void pcache1Cachesize(sqlite3_pcache *p, int nMax){ } /* -** Implementation of the sqlite3_pcache.xShrink method. +** Implementation of the sqlite3_pcache.xShrink method. ** ** Free up as much memory as possible. */ @@ -851,7 +851,7 @@ static void pcache1Shrink(sqlite3_pcache *p){ } /* -** Implementation of the sqlite3_pcache.xPagecount method. +** Implementation of the sqlite3_pcache.xPagecount method. */ static int pcache1Pagecount(sqlite3_pcache *p){ int n; @@ -872,8 +872,8 @@ static int pcache1Pagecount(sqlite3_pcache *p){ ** for these steps, the main pcache1Fetch() procedure can run faster. */ static SQLITE_NOINLINE PgHdr1 *pcache1FetchStage2( - PCache1 *pCache, - unsigned int iKey, + PCache1 *pCache, + unsigned int iKey, int createFlag ){ unsigned int nPinned; @@ -915,8 +915,8 @@ static SQLITE_NOINLINE PgHdr1 *pcache1FetchStage2( } } - /* Step 5. If a usable page buffer has still not been found, - ** attempt to allocate a new one. + /* Step 5. If a usable page buffer has still not been found, + ** attempt to allocate a new one. */ if( !pPage ){ pPage = pcache1AllocPage(pCache, createFlag==1); @@ -941,13 +941,13 @@ static SQLITE_NOINLINE PgHdr1 *pcache1FetchStage2( } /* -** Implementation of the sqlite3_pcache.xFetch method. +** Implementation of the sqlite3_pcache.xFetch method. ** ** Fetch a page by key value. ** ** Whether or not a new page may be allocated by this function depends on ** the value of the createFlag argument. 0 means do not allocate a new -** page. 1 means allocate a new page if space is easily available. 2 +** page. 1 means allocate a new page if space is easily available. 2 ** means to try really hard to allocate a new page. ** ** For a non-purgeable cache (a cache used as the storage for an in-memory @@ -958,7 +958,7 @@ static SQLITE_NOINLINE PgHdr1 *pcache1FetchStage2( ** There are three different approaches to obtaining space for a page, ** depending on the value of parameter createFlag (which may be 0, 1 or 2). ** -** 1. Regardless of the value of createFlag, the cache is searched for a +** 1. Regardless of the value of createFlag, the cache is searched for a ** copy of the requested page. If one is found, it is returned. ** ** 2. If createFlag==0 and the page is not already in the cache, NULL is @@ -972,13 +972,13 @@ static SQLITE_NOINLINE PgHdr1 *pcache1FetchStage2( ** PCache1.nMax, or ** ** (b) the number of pages pinned by the cache is greater than -** the sum of nMax for all purgeable caches, less the sum of +** the sum of nMax for all purgeable caches, less the sum of ** nMin for all other purgeable caches, or ** ** 4. If none of the first three conditions apply and the cache is marked ** as purgeable, and if one of the following is true: ** -** (a) The number of pages allocated for the cache is already +** (a) The number of pages allocated for the cache is already ** PCache1.nMax, or ** ** (b) The number of pages allocated for all purgeable caches is @@ -990,7 +990,7 @@ static SQLITE_NOINLINE PgHdr1 *pcache1FetchStage2( ** ** then attempt to recycle a page from the LRU list. If it is the right ** size, return the recycled buffer. Otherwise, free the buffer and -** proceed to step 5. +** proceed to step 5. ** ** 5. Otherwise, allocate and return a new page buffer. ** @@ -1000,8 +1000,8 @@ static SQLITE_NOINLINE PgHdr1 *pcache1FetchStage2( ** invokes the appropriate routine. */ static PgHdr1 *pcache1FetchNoMutex( - sqlite3_pcache *p, - unsigned int iKey, + sqlite3_pcache *p, + unsigned int iKey, int createFlag ){ PCache1 *pCache = (PCache1 *)p; @@ -1030,8 +1030,8 @@ static PgHdr1 *pcache1FetchNoMutex( } #if PCACHE1_MIGHT_USE_GROUP_MUTEX static PgHdr1 *pcache1FetchWithMutex( - sqlite3_pcache *p, - unsigned int iKey, + sqlite3_pcache *p, + unsigned int iKey, int createFlag ){ PCache1 *pCache = (PCache1 *)p; @@ -1045,8 +1045,8 @@ static PgHdr1 *pcache1FetchWithMutex( } #endif static sqlite3_pcache_page *pcache1Fetch( - sqlite3_pcache *p, - unsigned int iKey, + sqlite3_pcache *p, + unsigned int iKey, int createFlag ){ #if PCACHE1_MIGHT_USE_GROUP_MUTEX || defined(SQLITE_DEBUG) @@ -1076,18 +1076,18 @@ static sqlite3_pcache_page *pcache1Fetch( ** Mark a page as unpinned (eligible for asynchronous recycling). */ static void pcache1Unpin( - sqlite3_pcache *p, - sqlite3_pcache_page *pPg, + sqlite3_pcache *p, + sqlite3_pcache_page *pPg, int reuseUnlikely ){ PCache1 *pCache = (PCache1 *)p; PgHdr1 *pPage = (PgHdr1 *)pPg; PGroup *pGroup = pCache->pGroup; - + assert( pPage->pCache==pCache ); pcache1EnterMutex(pGroup); - /* It is an error to call this function if the page is already + /* It is an error to call this function if the page is already ** part of the PGroup LRU list. */ assert( pPage->pLruNext==0 ); @@ -1108,7 +1108,7 @@ static void pcache1Unpin( } /* -** Implementation of the sqlite3_pcache.xRekey method. +** Implementation of the sqlite3_pcache.xRekey method. */ static void pcache1Rekey( sqlite3_pcache *p, @@ -1119,7 +1119,7 @@ static void pcache1Rekey( PCache1 *pCache = (PCache1 *)p; PgHdr1 *pPage = (PgHdr1 *)pPg; PgHdr1 **pp; - unsigned int hOld, hNew; + unsigned int hOld, hNew; assert( pPage->iKey==iOld ); assert( pPage->pCache==pCache ); assert( iOld!=iNew ); /* The page number really is changing */ @@ -1147,7 +1147,7 @@ static void pcache1Rekey( } /* -** Implementation of the sqlite3_pcache.xTruncate method. +** Implementation of the sqlite3_pcache.xTruncate method. ** ** Discard all unpinned pages in the cache with a page number equal to ** or greater than parameter iLimit. Any pinned pages with a page number @@ -1164,7 +1164,7 @@ static void pcache1Truncate(sqlite3_pcache *p, unsigned int iLimit){ } /* -** Implementation of the sqlite3_pcache.xDestroy method. +** Implementation of the sqlite3_pcache.xDestroy method. ** ** Destroy a cache allocated using pcache1Create(). */ @@ -1230,7 +1230,7 @@ sqlite3_mutex *sqlite3Pcache1Mutex(void){ ** 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 +** been released, the function returns. The return value is the total number ** of bytes of memory released. */ int sqlite3PcacheReleaseMemory(int nReq){ |