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116 lines
3.9 KiB
116 lines
3.9 KiB
/*
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** 2001 September 15
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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** This header file defines the interface that the sqlite page cache
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** subsystem. The page cache subsystem reads and writes a file a page
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** at a time and provides a journal for rollback.
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**
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** @(#) $Id: pager.h,v 1.1.1.1 2006/02/03 20:35:17 hoganrobert Exp $
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*/
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/*
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** The default size of a database page.
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*/
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#ifndef SQLITE_DEFAULT_PAGE_SIZE
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# define SQLITE_DEFAULT_PAGE_SIZE 1024
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#endif
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/* Maximum page size. The upper bound on this value is 32768. This a limit
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** imposed by necessity of storing the value in a 2-byte unsigned integer
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** and the fact that the page size must be a power of 2.
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**
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** This value is used to initialize certain arrays on the stack at
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** various places in the code. On embedded machines where stack space
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** is limited and the flexibility of having large pages is not needed,
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** it makes good sense to reduce the maximum page size to something more
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** reasonable, like 1024.
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*/
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#ifndef SQLITE_MAX_PAGE_SIZE
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# define SQLITE_MAX_PAGE_SIZE 8192
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#endif
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/*
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** Maximum number of pages in one database.
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*/
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#define SQLITE_MAX_PAGE 1073741823
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/*
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** The type used to represent a page number. The first page in a file
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** is called page 1. 0 is used to represent "not a page".
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*/
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typedef unsigned int Pgno;
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/*
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** Each open file is managed by a separate instance of the "Pager" structure.
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*/
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typedef struct Pager Pager;
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/*
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** Allowed values for the flags parameter to sqlite3pager_open().
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**
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** NOTE: This values must match the corresponding BTREE_ values in btree.h.
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*/
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#define PAGER_OMIT_JOURNAL 0x0001 /* Do not use a rollback journal */
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#define PAGER_NO_READLOCK 0x0002 /* Omit readlocks on readonly files */
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/*
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** See source code comments for a detailed description of the following
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** routines:
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*/
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int sqlite3pager_open(Pager **ppPager, const char *zFilename,
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int nExtra, int flags);
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void sqlite3pager_set_busyhandler(Pager*, BusyHandler *pBusyHandler);
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void sqlite3pager_set_destructor(Pager*, void(*)(void*,int));
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void sqlite3pager_set_reiniter(Pager*, void(*)(void*,int));
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int sqlite3pager_set_pagesize(Pager*, int);
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void sqlite3pager_read_fileheader(Pager*, int, unsigned char*);
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void sqlite3pager_set_cachesize(Pager*, int);
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int sqlite3pager_close(Pager *pPager);
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int sqlite3pager_get(Pager *pPager, Pgno pgno, void **ppPage);
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void *sqlite3pager_lookup(Pager *pPager, Pgno pgno);
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int sqlite3pager_ref(void*);
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int sqlite3pager_unref(void*);
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Pgno sqlite3pager_pagenumber(void*);
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int sqlite3pager_write(void*);
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int sqlite3pager_iswriteable(void*);
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int sqlite3pager_overwrite(Pager *pPager, Pgno pgno, void*);
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int sqlite3pager_pagecount(Pager*);
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int sqlite3pager_truncate(Pager*,Pgno);
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int sqlite3pager_begin(void*, int exFlag);
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int sqlite3pager_commit(Pager*);
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int sqlite3pager_sync(Pager*,const char *zMaster, Pgno);
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int sqlite3pager_rollback(Pager*);
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int sqlite3pager_isreadonly(Pager*);
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int sqlite3pager_stmt_begin(Pager*);
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int sqlite3pager_stmt_commit(Pager*);
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int sqlite3pager_stmt_rollback(Pager*);
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void sqlite3pager_dont_rollback(void*);
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void sqlite3pager_dont_write(Pager*, Pgno);
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int *sqlite3pager_stats(Pager*);
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void sqlite3pager_set_safety_level(Pager*,int);
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const char *sqlite3pager_filename(Pager*);
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const char *sqlite3pager_dirname(Pager*);
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const char *sqlite3pager_journalname(Pager*);
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int sqlite3pager_rename(Pager*, const char *zNewName);
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void sqlite3pager_set_codec(Pager*,void(*)(void*,void*,Pgno,int),void*);
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int sqlite3pager_movepage(Pager*,void*,Pgno);
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int sqlite3pager_reset(Pager*);
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#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
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int sqlite3pager_lockstate(Pager*);
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#endif
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#ifdef SQLITE_TEST
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void sqlite3pager_refdump(Pager*);
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int pager3_refinfo_enable;
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#endif
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